CN103968441A - Multi-mode positive displacement heat exchange system and heat exchange processing method thereof - Google Patents

Abstract

The invention provides a multi-mode volumetric heat exchange system and a heat exchange treatment method thereof. The multi-mode volumetric heat exchange system integrates heating and domestic hot water supply into one body, and there is no need to separately design two sets of different heat exchange systems. The system, through a set of heat exchange system, can switch multiple working modes to provide heating and domestic hot water heating simultaneously or separately, thus making the overall structure of the heat exchange system supplying heating and domestic hot water It can be simplified and the overall volume can be reduced, which can help reduce the cost of system hardware equipment and land occupation and construction costs, and, in the working mode of providing domestic hot water and heating water at the same time, compared with the existing general heat exchange system , the multi-mode volumetric heat exchange system and its heat exchange treatment method of the present invention also have higher overall energy efficiency and can help reduce system energy consumption. Therefore, the multi-mode volumetric heat exchange system of the present invention and its multi-mode heat exchange The heat treatment method has a good prospect of popularization and application.

Description

A multi-mode volumetric heat exchange system and heat exchange treatment method thereof

technical field

The invention relates to the fields of air conditioning technology and heating technology, in particular to a multi-mode volumetric heat exchange system and a heat exchange treatment method thereof.

Background technique

Hot water boilers, solar collectors, etc., are common heat source water supply equipment for heating and domestic hot water. In the existing heat exchange system, according to the heat supply design specification, the temperature of the water supplied by the boiler as the heat source is usually around 95°C. Between 75°C and 85°C, which is higher than the water supply temperature range of 45°C to 60°C for domestic hot water, so two different heat exchange systems are generally required to supply heating and domestic hot water respectively; while heating at the end When the water supply of the equipment is low-temperature hot water, the water temperature in the heating water supply circuit is usually between 40°C and 50°C. Although it is very close to the water supply temperature range of 45°C to 60°C for domestic hot water, it is different from the supply of domestic hot water. Rely on domestic cold water from the domestic cold water supply pipeline as water supply, so it is necessary to consider the influence of the newly replenished domestic cold water on the temperature of the heating water supply circuit, so usually rely on two different heat exchange systems to supply heating and living respectively hot water. Due to the need for two sets of different heat exchange systems, the structure of the heating system is more complicated, and the overall construction cost increases accordingly. At the same time, the overall volume of the heating system equipment is relatively large, and a larger heating room needs to be built. Therefore, Its hardware equipment cost and land occupation and construction cost are relatively high. In addition, in the selection of heating engineering equipment, due to the conservatism of the designers, the load of the boiler generally takes 65% to 70% of the building load, but the flow rate of the water pump is calculated according to the rated load of the boiler, thus increasing the circulating water volume of the system And the head of the water pump, causing the system to operate under the condition of large flow and small temperature difference. At the same time, unreasonable selection of terminal equipment and improper operation and management of the heating system will cause problems of large flow and small temperature difference. As the flow rate of the system increases, the power of the corresponding unit and water pump increases accordingly, the outlet water temperature of the boiler decreases, and the water pump and boiler inevitably work at the point of low efficiency drop; at the same time, the large flow rate and small temperature difference lead to an increase in the flow rate of hot water in the heating pipeline. The resistance of the entire pipe network changes, and the balance of the pipe network is out of balance, which makes the near end of the heating system hot and the far end cold, and causes the energy efficiency of the heat source water supply equipment to be low, and the system does not save energy.

Contents of the invention

Aiming at the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a multi-mode volumetric heat exchange system that integrates heating and domestic hot water supply and can switch between multiple working modes, so as to solve the current problems. There are problems in the heat exchange system that supply heating and domestic hot water with complex structure, bulky volume, high hardware equipment cost and land occupation and construction cost, and improve the overall energy efficiency of the heat exchange system to help reduce system energy consumption.

In order to solve the problems of the technologies described above, the present invention adopts the following technical means:

A multi-mode volumetric heat exchange system, including a heat source water supplier, a heating water supply circuit, and a volumetric heat exchanger; the volumetric heat exchanger has a heat source water supply heat exchange cavity, a heat source return water mixing cavity, and a living water outlet cavity Body and heat exchange treatment control unit; one end of the heat source water supply heat exchange chamber is provided with a heat source water supply inlet pipe connected to the heat source water supply port of the heat source water supply device, and the other end is respectively mixed with the heat source return water chamber and the living water outlet chamber The body is connected, and the communication path between the heat source water supply heat exchange cavity and the domestic water outlet cavity is provided with a first electric control switch valve; the middle part of the heat source water supply heat exchange cavity is provided with a heating heat exchange coil. The water inlet and water outlet of the heat exchange coil are respectively connected to the heating return water inlet pipe and the heating water supply outlet pipe arranged on the side wall of the heat source water supply heat exchange chamber, wherein the heating water supply outlet pipe is relatively close to the heat source water supply inlet pipe and The heating water supply inlet of the heating water supply circuit is connected, the heating return water inlet pipe is relatively far away from the heat source water supply inlet pipe and is connected with the heating return water inlet of the heating water supply circuit, and the heating return water inlet pipe is provided with a second electric control on-off valve; The end of the domestic water outlet cavity away from the heat source water supply heat exchange cavity is provided with a domestic hot water outlet pipe connected to the domestic hot water supply pipeline, and an electronic flowmeter is arranged on the domestic hot water outlet pipe; The side of the water mixing chamber close to the heat source water supply heat exchange chamber is also equipped with a domestic cold water inlet pipe connected to the domestic cold water supply pipeline, and an electronically controlled flow control valve is installed on the domestic cold water inlet pipe; the heat source return water mixing The side of the chamber far away from the heat source water supply heat exchange chamber is provided with a heat source return water outlet pipe connected to the heat source return water port of the heat source water supply device; The middle part of the body is connected; the valve control output ends of the heat exchange treatment control unit are respectively electrically connected with the first electronically controlled on-off valve and the second electrically controlled on-off valve for providing control input operations, and according to the control input operations. An electronically controlled on-off valve and a second electronically controlled on-off valve are switched on and off; and the flow signal acquisition end of the heat exchange treatment control unit is electrically connected to the flow signal output end of the electronic flowmeter, and the flow control output end of the heat exchange treatment control unit is connected to the The control signal input terminal of the electronically controlled flow control valve is electrically connected, and is used to control the flow of the electronically controlled flow control valve according to the flow collected by the electronic flowmeter, so that the flow rate of the domestic cold water inlet pipe and the domestic hot water outlet pipe The flow is consistent.

As an improved solution based on the above-mentioned multi-mode volumetric heat exchange system, it also includes a heat medium water supply device, the water supply temperature of which is not lower than the preset minimum heating temperature T ₀ ; the volumetric heat exchange system In the heat source water supply heat exchange chamber of the heater, a temperature sensor and a heat medium heat exchange coil are also provided on the side close to the heat source water supply inlet pipe; the water inlet and outlet of the heat medium heat exchange coil are respectively connected to the The heat medium water supply inlet pipe and the heat medium return water outlet pipe on the side wall of the water supply heat exchange chamber, wherein the heat medium water supply inlet pipe is connected with the heat medium water supply port of the heat medium water supply device, and the heat medium return water outlet pipe is connected with the heat medium water supply port of the heat medium water supply device. The heat medium return port of the medium water supply device is connected, and a third electric control switch valve is provided on the heat medium water supply inlet pipe; the temperature signal acquisition end of the heat exchange treatment control unit is electrically connected with the temperature signal output end of the temperature sensor , the valve control output end of the heat exchange treatment control unit is also electrically connected to the third electronically controlled switch valve, and is used to control and turn on the fourth electronically controlled switch when the temperature collected by the temperature sensor is lower than the preset minimum heating temperature _T0 Valve, let the heat medium water supply device supply water to the heat medium heat exchange coil, and heat the water near the heat source water supply inlet pipe in the heat source water supply heat exchange cavity of the volumetric heat exchanger, so that the heat source feed water heat exchange cavity is close to the heat source water supply inlet The water temperature at the water pipe is not lower than the preset minimum heating temperature T ₀ .

As an improved solution based on the above-mentioned multi-mode volumetric heat exchange system, a temperature sensor and an auxiliary electric heating tube are also provided in the heat source water supply heat exchange chamber of the volumetric heat exchanger near the heat source water supply inlet pipe; The temperature signal acquisition end of the heat treatment control unit is electrically connected to the temperature signal output end of the temperature sensor, and the electric heating control output end of the heat exchange treatment control unit is electrically connected to the start-stop control input end of the auxiliary electric heating tube, which is used to judge the temperature collected by the temperature sensor. When the temperature is lower than the preset minimum heating temperature T ₀ , the auxiliary electric heating tube is controlled to be turned on for heating, so that the water temperature in the heat source water supply heat exchange cavity of the volumetric heat exchanger near the heat source water supply inlet pipe is not lower than the preset value Minimum heating temperature T ₀ .

Correspondingly, the present invention also provides a heat exchange treatment method of the above-mentioned multi-mode volumetric heat exchange system in different working modes. For this reason, the present invention has adopted following technical means:

A heat exchange treatment method of the above-mentioned multi-mode volumetric heat exchange system, which is used to provide domestic hot water to the domestic hot water supply pipeline, and at the same time provide heat exchange to the heating water supply circuit; the method specifically includes: operating volumetric heat exchange The heat exchange processing control unit of the positive displacement heat exchanger controls the opening of the first electric control on-off valve and the second electric control on-off valve, and the heat exchange processing control unit of the volumetric heat exchanger according to the flow rate collected by the electronic flowmeter on the domestic hot water outlet pipe Control the flow of the electronically controlled flow control valve on the domestic cold water inlet pipe, so that the water inlet flow of the domestic cold water inlet pipe is consistent with the outlet water flow of the domestic hot water outlet pipe; at the same time, the water circulation pump and the heating water supply circuit of the heat source water supply are turned on The heating water pump in the heat source water supply device; under the action of the water circulation pump of the heat source water supply device, the heat source water supply device provides hot water from the heat source water supply port through the heat source water supply inlet pipe to the heat source water supply heat exchange chamber of the volumetric heat exchanger, and at the same time, the heating water supply Under the action of the heating water pump in the circuit, the heating water in the heating water supply circuit enters the heating heat exchange coil of the volumetric heat exchanger from the heating return water inlet pipe, and then flows back from the heating water supply outlet pipe to the heating water supply circuit; The hot water in the heat exchange chamber flows through the position of the heating heat exchange coil to exchange heat with the heating water in the heating heat exchange coil, and then flows into the heat source return water mixing chamber and the living water outlet chamber; among them, the heat source feeds water The hot water flowing into the heat source and return water mixing chamber from the heat exchange chamber is mixed with the cold water entering the heat source and return water mixing chamber from the domestic cold water inlet pipe to form mixed water. Under the action of pressure, the mixed water flows to the mixed flow communication channel and the heat source return water outlet pipe respectively; the mixed water flowing from the heat source return water mixing chamber to the mixed flow communication channel enters the living water outlet cavity, and flows into the domestic outlet water from the heat source water supply heat exchange cavity. After the hot water in the cavity is mixed again, it flows out from the domestic hot water outlet pipe to provide domestic hot water to the domestic hot water supply pipeline; the mixed water flowing from the heat source return water mixing chamber to the heat source return water outlet pipe passes through the heat source return water outlet Return to heat source water supply.

A heat exchange treatment method of the above-mentioned multi-mode volumetric heat exchange system is used to provide domestic hot water only to the domestic hot water supply pipeline; the method specifically includes: operating the heat exchange treatment control unit of the volumetric heat exchanger to control the first The first electronically controlled on-off valve and the second electronically controlled on-off valve are closed, and the heat exchange processing control unit of the volumetric heat exchanger controls the electronic control on the domestic cold water inlet pipe according to the flow conditions collected by the electronic flowmeter on the domestic hot water outlet pipe. The flow control valve controls the flow, so that the water flow of the domestic cold water inlet pipe is consistent with the water flow of the domestic hot water outlet pipe; at the same time, the water circulation pump of the heat source water supplier is turned on; under the action of the water circulation pump of the heat source water supplier, the The heat source water supplier supplies hot water from the heat source water supply port through the heat source water supply inlet pipe to the heat source water supply heat exchange cavity of the volumetric heat exchanger, and the hot water flows from the heat source water supply heat exchange cavity into the heat source return water mixing cavity, and is mixed with the domestic cold water The cold water entering the heat source and return water mixing chamber from the water inlet pipe is mixed to form mixed water. Under the negative pressure of the domestic hot water supply and the negative pressure of the return water of the heat source water supplier, the mixed water flows to the mixed flow communication channel and the heat source return water outlet pipe respectively. ; The mixed water flowing from the heat source backwater mixing cavity to the mixed flow communication channel enters the domestic water outlet cavity and then flows out from the domestic hot water outlet pipe to provide domestic hot water to the domestic hot water supply pipeline; the heat source return water mixing cavity flows to the heat source The mixed water in the return water outlet pipe flows back to the heat source water supplier through the heat source water return port.

A heat exchange treatment method of the above-mentioned multi-mode volumetric heat exchange system, which is used to provide heat exchange only to the heating water supply circuit; the method specifically includes: operating the heat exchange treatment control unit of the volumetric heat exchanger to control the second electric control switch The valve is opened, the first electronically controlled on-off valve is closed, and when the outlet water of the domestic hot water outlet pipe does not provide domestic hot water to the domestic hot water supply pipeline, the heat exchange treatment control unit of the volumetric heat exchanger The flow rate collected by the electronic flowmeter on the hot water outlet pipe controls the electronically controlled flow control valve on the domestic cold water inlet pipe to cut off, so that the water inlet channel of the domestic cold water inlet pipe is disconnected; at the same time, the water circulation pump of the heat source water supply unit and the heating water supply are turned on The heating water pump in the circuit; under the action of the water circulation pump of the heat source water supply device, the heat source water supply device provides hot water from the heat source water supply port through the heat source water supply inlet pipe to the heat source water supply heat exchange chamber of the volumetric heat exchanger, and at the same time Under the action of the heating water pump in the water supply circuit, the heating water in the heating water supply circuit enters the heating heat exchange coil of the volumetric heat exchanger from the heating return water inlet pipe, and then flows back from the heating water supply outlet pipe to the heating water supply circuit; enters the heat source The hot water in the water supply heat exchange chamber flows through the position of the heating heat exchange coil to exchange heat with the heating water in the heating heat exchange coil, and then flows into the heat source and return water mixing chamber. Next, return the water from the heat source return water outlet to the heat source water supply through the heat source return water outlet pipe.

Compared with the prior art, the present invention has the following beneficial effects:

1. The multi-mode volumetric heat exchange system of the present invention integrates heating and domestic hot water supply into one body, and can switch between multiple working modes. Only with the heat exchange treatment of one volumetric heat exchanger, it can simultaneously Or provide heating and domestic hot water heating separately, so that the overall structure of the heat exchange system that supplies heating and domestic hot water can be simplified, which can help reduce the cost of system hardware equipment and land occupation and construction costs.

2. The multi-mode volumetric heat exchange system of the present invention, in the working mode of providing domestic hot water and heating water supply at the same time, directly uses the hot water after heating and heat exchange to mix with cold water to provide domestic hot water. In terms of heating cold water and providing domestic hot water, it reduces the hot water loss of the unit, and at the same time reduces the return water temperature of the boiler, which increases the operating efficiency of the boiler and avoids the operating state of the system with large flow and small temperature difference. The circulating water pump operates at a high-efficiency point, and the actual operating power consumption and power consumption are smaller than those of traditional heating and domestic hot water systems. Therefore, the overall energy efficiency increases on the heat source side of the multi-mode volumetric heat exchange system, which can help reduce system energy consumption .

3. The multi-mode volumetric heat exchange system of the present invention can also add auxiliary heating equipment to the multi-mode volumetric heat exchange system of the present invention, and control the opening and closing of the auxiliary heating equipment through temperature detection to ensure the multi-mode volume The type heat exchange system can ensure that the heating and domestic hot water heating meet the heating temperature requirements under different circumstances.

4. The multi-mode volumetric heat exchange system of the present invention and its multi-mode heat exchange treatment method solve the problem of the complex structure and volume of the heat exchange system for supplying heating and domestic hot water in the prior art. The problem of large size, high cost of hardware equipment and high construction cost can also improve the overall energy efficiency of the heat exchange system, and has a good prospect for popularization and application.

Description of drawings

Fig. 1 is a schematic structural view of a specific embodiment of the multi-mode volumetric heat exchange system of the present invention.

Fig. 2 is a structural schematic diagram of an improved embodiment of the multi-mode volumetric heat exchange system of the present invention.

Fig. 3 is a structural schematic diagram of another improved embodiment of the multi-mode volumetric heat exchange system of the present invention.

Detailed ways

The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

The purpose of the present invention is to provide a multi-mode volumetric heat exchange system, which integrates heating and domestic hot water heating, and can switch multiple working modes to provide heating and domestic heating simultaneously or separately. Hot water heating simplifies the overall structure of the heat exchange system for heating and domestic hot water supply, which can help reduce the cost of system hardware equipment and land occupation and construction costs, thereby solving the problem of heating and domestic hot water supply in the prior art. The heat exchange system has complex structure, large volume, high cost of hardware equipment and high cost of land occupation and construction.

The overall structure of the multi-mode volumetric heat exchange system of the present invention is shown in FIG. 1 , which mainly includes a heat source water supplier 200 , a heating water supply circuit 300 and a volumetric heat exchanger 100 . Among them, both the heat source water supplier 200 and the heating water supply circuit 300 can keep the existing structure unchanged; while the volumetric heat exchanger 100 in the multi-mode volumetric heat exchange system of the present invention adopts an integrated structure. The volumetric heat exchanger 100 has a heat source water supply heat exchange cavity 110, a heat source return water mixing cavity 120, a domestic outlet water cavity 130, and a heat exchange treatment control unit (the heat exchange treatment control unit is omitted in FIG. 1 and is not shown) . Wherein, one end of the heat source water supply heat exchange chamber 110 is provided with a heat source water supply inlet pipe 111 connected to the heat source water supply port of the heat source water supply device 200, and the other end is respectively connected with the heat source return water mixing chamber 120 and the domestic water outlet chamber 130 , and the communication path between the heat source water supply heat exchange cavity 110 and the domestic water outlet cavity 130 is provided with a first electronically controlled switch valve 140; the middle part of the heat source water supply heat exchange cavity 110 is provided with a heating heat exchange coil 112, The water inlet and outlet of the heating heat exchange coil 112 are respectively connected to the heating return water inlet pipe 114 and the heating water supply outlet pipe 113 arranged on the side wall of the heat source water supply heat exchange chamber 110, wherein the heating water supply outlet pipe 113 is relatively close to The heat source water supply inlet pipe 111 is in communication with the heating water supply inlet of the heating water supply circuit 300, the heating return water inlet pipe 114 is relatively far away from the heat source water supply inlet pipe 111 and is connected with the heating return water inlet of the heating water supply circuit 300, and is connected to the heating return water inlet pipe 114. The water pipe 114 is provided with a second electric control switch valve 150 . The domestic water outlet cavity 130 is provided with a domestic hot water outlet pipe 131 connected to the domestic hot water supply pipeline at one end away from the heat source water supply heat exchange chamber 110 , and an electronic flow meter 160 is provided on the domestic hot water outlet pipe 131 . The side of the heat source and return water mixing cavity 120 close to the heat source water supply and heat exchange cavity 110 is also provided with a domestic cold water inlet pipe 121 connected with the domestic cold water supply pipeline, and an electronically controlled flow rate is provided on the domestic cold water inlet pipe 121. Control valve 170; heat source return water mixing cavity 120 is provided with a heat source return water outlet pipe 122 connected to the heat source water return port of heat source water supplier 200 on the side away from heat source water supply heat exchange cavity 110; and heat source return water mixing cavity The middle part of 120 communicates with the middle part of the domestic outlet water cavity 130 through the mixed-flow communication channel 123 . In the system, the valve control output terminals of the heat exchange treatment control unit are respectively electrically connected to the first electronically controlled on-off valve 140 and the second electrically controlled on-off valve 150 to provide control input operations, and to control the first electronically controlled on-off valve according to the control input operations. The on-off valve 140 and the second electronically controlled on-off valve 150 perform on-off control; and the flow signal acquisition end of the heat exchange treatment control unit is electrically connected to the flow signal output end of the electronic flowmeter 160, and the flow control output end of the heat exchange treatment control unit is connected to the The control signal input end of the electronically controlled flow control valve 170 is electrically connected, and is used to control the flow rate of the electronically controlled flow control valve 170 according to the flow rate collected by the electronic flowmeter 160, so that the flow rate of the domestic cold water inlet pipe 121 is equal to that of the domestic hot water. The water outlet flow rates of the water outlet pipes 131 are consistent.

The multi-mode volumetric heat exchange system of the present invention can switch between multiple working modes, and can simultaneously or separately provide heating and domestic hot water heating with only one volumetric heat exchanger. The mode switching control is also very convenient. The different working modes and the heat exchange treatment process of the multi-mode volumetric heat exchange system of the present invention will be described below through different implementation modes.

Implementation mode one:

When using the multi-mode volumetric heat exchange system of the present invention to provide domestic hot water to the domestic hot water supply pipeline and provide heat exchange to the heating water supply circuit at the same time, the heat exchange process is as follows:

Operate the heat exchange treatment control unit of the volumetric heat exchanger to control the opening of the first electronic control on-off valve and the second electric control on-off valve, and the heat exchange treatment control unit of the volumetric heat exchanger The flow rate collected by the meter controls the flow of the electronically controlled flow control valve on the domestic cold water inlet pipe, so that the water inlet flow of the domestic cold water inlet pipe is consistent with the water outlet flow of the domestic hot water outlet pipe; at the same time, the water circulation of the heat source water supply is turned on Pumps and heating water pumps in heating water supply circuits. Since then, under the action of the water circulation pump of the heat source water supply device, the heat source water supply device provides hot water from the heat source water supply port through the heat source water supply inlet pipe to the heat source water supply heat exchange chamber of the volumetric heat exchanger, and at the same time in the heating water supply circuit Under the action of the heating water pump in the heating water supply circuit, the heating water in the heating water supply circuit enters the heating heat exchange coil of the volumetric heat exchanger from the heating return water inlet pipe, and then flows back from the heating water supply outlet pipe to the heating water supply circuit; The hot water in the hot chamber flows through the location of the heating heat exchange coil to exchange heat with the heating water in the heating heat exchange coil, and then flows into the heat source return water mixing chamber and the living water outlet chamber respectively; The hot water flowing from the hot chamber into the heat source and return water mixing chamber is mixed with the cold water entering the heat source and return water mixing chamber from the domestic cold water inlet pipe to form mixed water. The negative pressure of the domestic hot water supply and the return water of the heat source water supply Under the action, the mixed water flows to the mixed flow communication channel and the heat source return water outlet pipe respectively; the mixed water flowing from the heat source return water mixing chamber to the mixed flow communication channel enters the living water outlet cavity, and flows into the living water outlet cavity from the heat source water supply heat exchange cavity After the hot water in the body is mixed again, it flows out from the domestic hot water outlet pipe to provide domestic hot water to the domestic hot water supply pipeline; the mixed water flowing from the heat source return water mixing chamber to the heat source return water outlet pipe flows back through the heat source return water outlet to the heat source water supply.

From the above heat exchange process, it can be seen that the multi-mode volumetric heat exchange system of the present invention provides domestic hot water to the domestic hot water supply pipeline and simultaneously provides heat exchange to the heating water supply circuit. In this process, the hot water supplied from the heat source water supplier to the volumetric heat exchanger, after entering the heat source water supply heat exchange cavity, first flows through the position of the heating heat exchange coil, and in the heat source water supply heat exchange cavity, it is exchanged with the heating heat exchange chamber. After the heating water in the heating coil is heat-exchanged, the temperature of the heating water is increased, and the temperature of the hot water can be lowered for the first time; as long as the actual temperature of the hot water supplied by the heat source water supplier is reasonably controlled, the water flowing through the heating heat exchange coil The heating water flow rate can make the heating water supply temperature after heat exchange and temperature rise reach the preset temperature requirement (for example, control it between 75°C and 85°C). At the same time, since the supply temperature of domestic hot water is required to be between 45°C and 60°C, the temperature of the hot water after heat exchange between the heat source water supply heat exchange chamber and the heating heat exchange coil is also around 70°C. The domestic cold water inlet pipe enters the heat source and return water mixing cavity to form mixed water, and the other part is mixed with the mixed water again, and then flows out from the domestic hot water outlet pipe, thus re-mixing with cold water makes the hot water temperature second. The second reduction can make the domestic hot water supply temperature of the multi-mode volumetric heat exchange system meet the requirement of being lower than the heating water supply temperature; as long as the water supply flow rate of the heat source water supplier is reasonably controlled according to the actual hot water temperature supplied by the heat source water supplier, it will be convenient It can make the temperature of the domestic hot water supplied from the domestic hot water outlet pipe of the volumetric heat exchanger to the domestic hot water supply pipeline meet the preset temperature requirements, and can remix the cold water with the outlet water of the domestic hot water outlet pipe, etc. To cool down again to meet the temperature requirements of different domestic hot water supply. In the system, the domestic cold water supply pipeline can be in various forms, for example, it can be a tap water supply pipeline, or a water supply pipeline of a self-built reservoir, etc. Not only that, in the working mode of providing domestic hot water and heating water supply at the same time, compared with the existing general heat exchange system, the multi-mode volumetric heat exchange system of the present invention has higher overall energy efficiency, which can help Reduce system power consumption. Because the multi-mode volumetric heat exchange system of the present invention directly mixes hot water and cold water after heating and heat exchange to provide domestic hot water, compared with providing domestic hot water by heating cold water through heat exchange, it reduces the cost of the unit. The loss of hot water also reduces the return water temperature of the boiler, which increases the operating efficiency of the boiler. At the same time, it avoids the operating state of the system with large flow and small temperature difference, so that the circulating water pump operates at the high efficiency point. The actual operating power consumption and electricity The consumption is smaller than that of traditional heating and domestic hot water systems, so the overall energy efficiency increases on the heat source side of the multi-mode volumetric heat exchange system, which can help reduce system energy consumption. In addition, the reason why the multi-mode volumetric heat exchange system of the present invention needs the heat exchange processing control unit of the volumetric heat exchanger to control the electronic control of the domestic cold water inlet pipe according to the flow conditions collected by the electronic flowmeter on the domestic hot water outlet pipe. The flow control valve controls the flow so that the water flow of the domestic cold water inlet pipe is consistent with the water flow of the domestic hot water outlet pipe, because the water supply flow from the heat source water supplier to the volumetric heat exchanger The flow rate of the return water pumped by the heater is always consistent, and then the flow rate of the domestic cold water inlet pipe into the cold water is controlled to be consistent with the flow rate of the domestic hot water outlet pipe. The total flow is always balanced.

Implementation mode two:

When the multi-mode volumetric heat exchange system of the present invention is used to provide domestic hot water only to the domestic hot water supply pipeline, the heat exchange process is specifically as follows:

Operate the heat exchange treatment control unit of the volumetric heat exchanger to control the closing of the first electronic control on-off valve and the second electric control on-off valve, and the heat exchange treatment control unit of the volumetric heat exchanger according to the electronic flow rate on the domestic hot water outlet pipe The flow rate collected by the meter controls the flow of the electronically controlled flow control valve on the domestic cold water inlet pipe, so that the water inlet flow of the domestic cold water inlet pipe is consistent with the water outlet flow of the domestic hot water outlet pipe; at the same time, the water circulation of the heat source water supply is turned on Pump. Since then, under the action of the water circulation pump of the heat source water supply device, the heat source water supply device provides hot water from the heat source water supply port through the heat source water supply inlet pipe to the heat source water supply heat exchange cavity of the volumetric heat exchanger, and the hot water is supplied from the heat source water supply The heat exchange chamber flows into the heat source and return water mixing chamber, and mixes with the cold water that enters the heat source and return water mixing chamber from the domestic cold water inlet pipe to form mixed water. The negative pressure of the domestic hot water supply and the return water of the heat source water supply Next, the mixed water flows to the mixed flow communication channel and the heat source return water outlet pipe respectively; the mixed water flowing from the heat source return water mixing cavity to the mixed flow communication channel enters the domestic water outlet cavity and then flows out from the domestic hot water outlet pipe to supply domestic hot water The pipeline provides domestic hot water; the mixed water flowing from the heat source return water mixing chamber to the heat source return water outlet pipe returns to the heat source water supplier through the heat source return water outlet.

Through the above heat exchange process, it can be seen that the multi-mode volumetric heat exchange system of the present invention only provides domestic hot water to the domestic hot water supply pipeline. In this process, the hot water provided by the heat source water supplier to the volumetric heat exchanger flows into the heat source and return water mixing chamber from the heat source water supply heat exchange chamber, and enters the heat source and return water mixing chamber from the domestic cold water inlet pipe. After the cold water is mixed to form mixed water, it flows out from the domestic hot water outlet pipe of the domestic water outlet cavity, thereby mixing with cold water, which can reduce the domestic hot water supply temperature of the multi-mode volumetric heat exchange system; as long as the heat source water supply device The actual temperature of the hot water supplied and the reasonable control of the water supply flow of the heat source water supplier can make the temperature of the domestic hot water supplied from the domestic hot water outlet pipe of the volumetric heat exchanger to the domestic hot water supply pipeline meet the preset temperature requirements , and the temperature can be lowered again by mixing the outlet water of the domestic hot water outlet pipe with cold water again, so as to meet the requirements of different domestic hot water supply temperature. In this process, the heat exchange processing control unit of the volumetric heat exchanger controls the flow rate of the domestic cold water inlet pipe to be consistent with the flow rate of the domestic hot water outlet pipe. The flow and the total flow of water can always be balanced.

Implementation mode three:

When the multi-mode volumetric heat exchange system of the present invention is used to provide heat exchange only to the heating water supply circuit, the heat exchange process is specifically as follows:

Operate the heat exchange treatment control unit of the volumetric heat exchanger to control the opening of the second electronically controlled on-off valve and the closing of the first electronically controlled on-off valve, and when the outlet water of the domestic hot water outlet pipe does not provide domestic hot water to the domestic hot water supply pipeline In the case of a positive displacement heat exchanger, the heat exchange processing control unit of the volumetric heat exchanger controls the electronically controlled flow control valve on the domestic cold water inlet pipe to stop according to the flow rate collected by the electronic flowmeter on the domestic hot water outlet pipe, so that the flow rate of the domestic cold water inlet pipe The water inlet channel is disconnected; the water circulation pump of the heat source water supplier and the heating water pump in the heating water supply circuit are turned on at the same time. Since then, under the action of the water circulation pump of the heat source water supply device, the heat source water supply device provides hot water from the heat source water supply port through the heat source water supply inlet pipe to the heat source water supply heat exchange chamber of the volumetric heat exchanger, and at the same time in the heating water supply circuit Under the action of the heating water pump in the heating water supply circuit, the heating water in the heating water supply circuit enters the heating heat exchange coil of the volumetric heat exchanger from the heating return water inlet pipe, and then flows back from the heating water supply outlet pipe to the heating water supply circuit; The hot water in the hot chamber flows through the position of the heating heat exchange coil to exchange heat with the heating water in the heating heat exchange coil, and then flows into the heat source and return water mixing chamber. Under the negative pressure of the return water of the heat source water supplier, Return water from the heat source return water outlet to the heat source water supply through the heat source return water outlet pipe.

From the above heat exchange process flow, it can be seen that the multi-mode volumetric heat exchange system of the present invention only provides heat exchange to the heating water supply circuit. In this process, the hot water supplied from the heat source water supplier to the volumetric heat exchanger, after entering the heat source water supply heat exchange cavity, flows through the position of the heating heat exchange coil, and exchanges heat with the heating system in the heat source water supply heat exchange cavity. After the heating water in the coil is heat-exchanged, the temperature of the heating water is increased; as long as the heating water flow through the heating heat exchange coil is reasonably controlled according to the actual temperature of the hot water supplied by the heat source water supplier, the heat exchanged coil can be made The heating water supply temperature after heating reaches the preset temperature requirement (for example, controlled between 75°C and 85°C). During this process, since the outlet flow of the domestic hot water outlet pipe of the volumetric heat exchanger is zero, under the flow control of the heat exchange treatment control unit, the electronically controlled flow control valve on the domestic cold water inlet pipe of the volumetric heat exchanger It is controlled to cut off, so the domestic cold water inlet pipe does not have cold water entering the heat source and return water mixing chamber, so in the working mode of only providing heating water supply, the water in and out of the volumetric heat exchanger is the supply water and return water of the heat source water supplier .

Based on the above descriptions of the overall structure and heat exchange process of the multi-mode volumetric heat exchange system of the present invention, it can be seen that the multi-mode volumetric heat exchange system of the present invention integrates heating and domestic hot water supply, without Separately design two sets of different heat exchange systems. Through one heat exchange system, multiple working modes can be switched to provide heating and domestic hot water heating simultaneously or separately, thus making heating and domestic heating possible. The overall structure of the hot water heat exchange system is simplified and the overall volume is reduced, which can help reduce the cost of system hardware equipment and land occupation and construction costs; and, in the working mode of simultaneously providing domestic hot water and heating water supply, compared with existing For some general heat exchange systems, the multi-mode volumetric heat exchange system of the present invention also has higher overall energy efficiency, which can help reduce system energy consumption.

In addition, considering that the heat source water supply used in different regions is different, for example, in some areas where solar collectors are used as heat source water supply, the temperature of the hot water supplied may be unstable due to the seasonal and temporal changes of solar energy, It may even occur that the temperature of the supplied hot water is too low to effectively ensure that the heating and domestic hot water heating meet the heating temperature requirements. For this reason, as a further improvement on the basis of the multi-mode volumetric heat exchange system of the present invention, auxiliary heating equipment can also be added to the multi-mode volumetric heat exchange system of the present invention, and the opening of the auxiliary heating equipment can be controlled by temperature detection , closed, to ensure that the multi-mode volumetric heat exchange system can ensure that the heating and domestic hot water heating meet the heating temperature requirements under different circumstances.

One implementation of this improved solution is, as shown in Figure 2, on the basis of the multi-mode volumetric heat exchange system shown in Figure 1, a heat medium water supply device 400 is added in the system, and the heat medium water supply device 400 The water supply temperature is not lower than the preset minimum heating temperature T ₀ (for example, the minimum heating temperature T ₀ is required to be 75°C). In the heat source water supply heat exchange cavity 110 of the volumetric heat exchanger 100, a temperature sensor 115 and a heat medium heat exchange coil 116 are also added near the heat source water supply inlet pipe 111; the water inlet of the heat medium heat exchange coil 116 and The water outlets are respectively connected to the heat medium water supply inlet pipe 117 and the heat medium return water outlet pipe 118 arranged on the side wall of the heat source water supply heat exchange chamber 110, wherein the heat medium water supply inlet pipe 117 and the heat medium water supply pipe 117 of the heat medium water supply device 400 The water supply port is connected, and the heat medium return water outlet pipe 118 is connected with the heat medium return water port of the heat medium water supply device 400, and a third electric control switch valve 180 is provided on the heat medium water supply inlet pipe 117; the volumetric heat exchanger The temperature signal acquisition end of the heat exchange treatment control unit of 100 is electrically connected with the temperature signal output end of the temperature sensor 115, and the valve control output end of the heat exchange treatment control unit is also electrically connected with the third electric control switching valve 180 for judging the temperature When the temperature collected by the sensor 115 is lower than the preset minimum heating temperature _T0 , the third electronically controlled on-off valve 180 is controlled to be opened, so that the heat medium water supplier 400 supplies water to the heat medium heat exchange coil 116, and the volumetric heat exchanger The heat source of 100 heats the water near the heat source water supply inlet pipe 111 in the heat source water supply heat exchange cavity 110, so that the water temperature in the heat source water supply heat exchange cavity 110 near the heat source water supply water inlet pipe 111 is not lower than the preset minimum heating temperature T ₀ . The meanings of other symbols in the multi-mode volumetric heat exchange system shown in FIG. 2 are the same as those in FIG. 1 . Thus, when the temperature sensor detects that the temperature of the hot water supplied by the heat source water supplier into the heat exchange chamber of the volumetric heat exchanger near the heat source water supply inlet pipe is lower than the minimum heat supply temperature _T0 , the heat exchange The processing control unit immediately controls to open the third electric control switch valve, so that the heat medium water supply device supplies water to the heat medium heat exchange coil, and heats the water in the heat source water supply heat exchange cavity of the volumetric heat exchanger near the heat source water supply inlet pipe. , to increase the temperature of hot water to better ensure that heating and domestic hot water heating can meet the heating temperature requirements.

Another implementation of this improvement is that, as shown in Figure 3, on the basis of the multi-mode volumetric heat exchange system shown in Figure 1, the heat source of the volumetric heat exchanger 100 in the system is fed to the water heat exchange chamber A temperature sensor 115 and an auxiliary electric heating tube 119 are added to the side near the heat source water supply inlet pipe 111 in 110; the temperature signal acquisition end of the heat exchange treatment control unit of the volumetric heat exchanger 100 is electrically connected to the temperature signal output end of the temperature sensor 115, The electric heating control output terminal of the heat exchange treatment control unit is electrically connected to the start-stop control input terminal of the auxiliary electric heating tube 119, which is used to judge that the temperature collected by the temperature sensor 115 is lower than the preset minimum heating temperature T ₀ (for example, the minimum heating supply temperature T0 is required) When the heat temperature _T0 is 75°C), the auxiliary electric heating tube 119 is controlled to be turned on for heating, so that the water temperature in the heat source water supply heat exchange chamber 110 of the volumetric heat exchanger 100 near the heat source water supply inlet pipe 111 is not lower than the preset value. Minimum heating temperature T ₀ . The meanings of other symbols in the multi-mode volumetric heat exchange system shown in FIG. 3 are the same as those in FIG. 1 . Thus, when the temperature sensor detects that the temperature of the hot water supplied by the heat source water supplier into the heat exchange chamber of the volumetric heat exchanger near the heat source water supply inlet pipe is lower than the minimum heat supply temperature _T0 , the heat exchange The processing control unit immediately controls the opening of the auxiliary electric heating tube to heat the water in the heat source water supply heat exchange chamber of the volumetric heat exchanger near the heat source water supply inlet pipe to increase the temperature of the hot water to better ensure heating and life. Hot water heating can meet the heating temperature requirements.

To sum up, the multi-mode volumetric heat exchange system of the present invention and its multi-mode heat exchange treatment method solve the problem of the structure of the heat exchange system for supplying heating and domestic hot water in the prior art. The problems of complexity, bulkiness, high cost of hardware equipment and land occupation and construction can also improve the overall energy efficiency of the heat exchange system, and have a good prospect for popularization and application.

Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present invention without limitation. Although the present invention has been described in detail with reference to the embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or Equivalent replacements without departing from the spirit and scope of the technical solutions of the present invention shall be covered by the scope of the claims of the present invention.

Claims (6)

1. A multi-mode volumetric heat exchange system, characterized in that it comprises a heat source water supplier, a heating water supply circuit and a volumetric heat exchanger; Cavity, living water outlet cavity and heat exchange treatment control unit; One end of the heat source water supply heat exchange chamber is provided with a heat source water supply inlet pipe connected to the heat source water supply port of the heat source water supplier, and the other end is respectively connected with the heat source return water mixing chamber and the domestic water outlet chamber, and the heat source water exchange The communication path between the heat cavity and the living water outlet cavity is provided with a first electric control switch valve; the middle part of the heat source water supply heat exchange cavity is provided with a heating heat exchange coil, and the water inlet of the heating heat exchange coil and The water outlets are respectively connected to the heating return water inlet pipe and the heating water supply outlet pipe arranged on the side wall of the heat source water supply heat exchange cavity, wherein the heating water supply outlet pipe is relatively close to the heat source water supply inlet pipe and connected to the heating water supply inlet of the heating water supply circuit The heating return water inlet pipe is relatively far away from the heat source water supply inlet pipe and is connected with the heating return water inlet of the heating water supply circuit, and a second electric control switch valve is arranged on the heating return water inlet pipe; The end of the domestic water outlet cavity away from the heat source water supply heat exchange cavity is provided with a domestic hot water outlet pipe connected to the domestic hot water supply pipeline, and an electronic flowmeter is provided on the domestic hot water outlet pipe; The side of the heat source and return water mixing chamber close to the heat source water supply heat exchange chamber is also provided with a domestic cold water inlet pipe connected to the domestic cold water supply pipeline, and an electronically controlled flow control valve is provided on the domestic cold water inlet pipe; The side of the heat source and return water mixing cavity away from the heat source water supply and heat exchange cavity is provided with a heat source return water outlet pipe connected to the heat source return water port of the heat source water supply device; Connected with the middle of the living water outlet cavity; The valve control output ends of the heat exchange treatment control unit are respectively electrically connected to the first electronically controlled on-off valve and the second electrically controlled on-off valve to provide control input operations, and to control the first electronically controlled on-off valve and the second electronically controlled on-off valve according to the control input operations. The second electronically controlled on-off valve performs on-off control; and the flow signal acquisition end of the heat exchange treatment control unit is electrically connected to the flow signal output end of the electronic flowmeter, and the flow control output end of the heat exchange treatment control unit is connected to the electronic control flow control valve. The control signal input end is electrically connected, and is used to control the flow of the electronically controlled flow control valve according to the flow collected by the electronic flowmeter, so that the water flow rate of the domestic cold water inlet pipe is consistent with the water flow rate of the domestic hot water outlet pipe. 2. The multi-mode volumetric heat exchange system according to claim 1, characterized in that it further comprises a heat medium water supply device, the water supply temperature of the heat medium water supply device is not lower than the preset minimum heating temperature T ₀ ; The heat source water supply heat exchange chamber of the volumetric heat exchanger is also provided with a temperature sensor and a heat medium heat exchange coil on the side close to the heat source water supply inlet pipe; the water inlet and water outlet of the heat medium heat exchange coil are respectively It is connected to the heat medium water supply inlet pipe and the heat medium return water outlet pipe arranged on the side wall of the heat source water supply heat exchange chamber, wherein the heat medium water supply inlet pipe is connected with the heat medium water supply port of the heat medium water supply device, and the heat medium return water The water outlet pipe is connected with the heat medium return port of the heat medium water supply device, and a third electric control on-off valve is provided on the heat medium water supply inlet pipe; The temperature signal acquisition end of the heat exchange treatment control unit is electrically connected to the temperature signal output end of the temperature sensor, and the valve control output end of the heat exchange treatment control unit is also electrically connected to the third electronically controlled switch valve for judging the temperature sensor acquisition. When the temperature is lower than the preset minimum heating temperature T ₀ , the fourth electric control switch valve is controlled to open, so that the heat medium water supply device supplies water to the heat medium heat exchange coil, and the heat source of the volumetric heat exchanger feeds water to the heat exchange chamber. The water in the body close to the heat source water supply inlet pipe is heated so that the water temperature in the heat source feed water heat exchange chamber near the heat source water supply water inlet pipe is not lower than the preset minimum heating temperature T ₀ . 3. The multi-mode volumetric heat exchange system according to claim 1, characterized in that a temperature sensor and an auxiliary water supply pipe are provided on the side of the heat source water supply heat exchange cavity of the volumetric heat exchanger near the heat source water supply inlet pipe. Heater; The temperature signal acquisition end of the heat exchange treatment control unit is electrically connected to the temperature signal output end of the temperature sensor, and the electric heating control output end of the heat exchange treatment control unit is electrically connected to the start-stop control input end of the auxiliary electric heating tube for judging the temperature When the temperature collected by the sensor is lower than the preset minimum heating temperature T ₀ , the auxiliary electric heating tube is controlled to be turned on for heating, so that the water temperature in the heat source water supply heat exchange cavity of the volumetric heat exchanger near the heat source water supply inlet pipe is not lower than the preset temperature. Set the minimum heating temperature T ₀ . 4. The heat exchange treatment method of the multi-mode volumetric heat exchange system according to any one of claims 1 to 3, characterized in that, it is used to provide domestic hot water to domestic hot water supply pipelines and simultaneously supply heating water The loop provides heat exchange; the method is specifically: Operate the heat exchange treatment control unit of the volumetric heat exchanger to control the opening of the first electronic control on-off valve and the second electric control on-off valve, and the heat exchange treatment control unit of the volumetric heat exchanger The flow rate collected by the meter controls the flow of the electronically controlled flow control valve on the domestic cold water inlet pipe, so that the water inlet flow of the domestic cold water inlet pipe is consistent with the water outlet flow of the domestic hot water outlet pipe; at the same time, the water circulation of the heat source water supply is turned on Pumps and heating water pumps in the heating water supply circuit; Under the action of the water circulation pump of the heat source water supply device, the heat source water supply device provides hot water from the heat source water supply port through the heat source water supply inlet pipe to the heat source water supply heat exchange chamber of the volumetric heat exchanger, and at the same time, the heating water pump in the heating water supply circuit Under the action, the heating water in the heating water supply circuit enters the heating heat exchange coil of the volumetric heat exchanger from the heating return water inlet pipe, and then flows back from the heating water supply outlet pipe to the heating water supply circuit; The hot water flows through the location of the heating heat exchange coil and exchanges heat with the heating water in the heating heat exchange coil, and then flows into the heat source and return water mixing cavity and the living water outlet cavity respectively; among them, the heat source feed water heat exchange cavity flows into The hot water in the heat source and return water mixing chamber is mixed with the cold water entering the heat source and return water mixing chamber from the domestic cold water inlet pipe to form mixed water. The water flows to the mixed flow communication channel and the heat source return water outlet pipe respectively; the mixed water flowing from the heat source return water mixing chamber to the mixed flow communication channel enters the domestic water outlet chamber, and the hot water flowing into the domestic water outlet chamber from the heat source water supply heat exchange chamber After mixing again, the domestic hot water flows out from the domestic hot water outlet pipe to provide domestic hot water to the domestic hot water supply pipeline; the mixed water flowing from the heat source return water mixing chamber to the heat source return water outlet pipe flows back to the heat source water supply through the heat source return water outlet . 5. The heat exchange treatment method of the multi-mode volumetric heat exchange system according to any one of claims 1 to 3, characterized in that, it is used to provide domestic hot water only to the domestic hot water supply pipeline; the method is specifically : Operate the heat exchange treatment control unit of the volumetric heat exchanger to control the closing of the first electronic control on-off valve and the second electric control on-off valve, and the heat exchange treatment control unit of the volumetric heat exchanger according to the electronic flow rate on the domestic hot water outlet pipe The flow rate collected by the meter controls the flow of the electronically controlled flow control valve on the domestic cold water inlet pipe, so that the water inlet flow of the domestic cold water inlet pipe is consistent with the water outlet flow of the domestic hot water outlet pipe; at the same time, the water circulation of the heat source water supply is turned on Pump; Under the action of the water circulation pump of the heat source water supply device, the heat source water supply device provides hot water from the heat source water supply port through the heat source water supply inlet pipe to the heat source water supply heat exchange cavity of the volumetric heat exchanger, and the hot water is supplied from the heat source water supply heat exchange cavity It flows into the heat source and return water mixing cavity, and mixes with the cold water that enters the heat source and return water mixing cavity from the domestic cold water inlet pipe to form mixed water. Then flow to the mixed flow communication channel and the heat source return water outlet pipe respectively; the mixed water flowing from the heat source return water mixing cavity to the mixed flow communication channel enters the domestic water outlet cavity and then flows out from the domestic hot water outlet pipe to provide domestic hot water supply pipes. Hot water; the mixed water flowing from the heat source return water mixing cavity to the heat source return water outlet pipe returns to the heat source water supply through the heat source return water outlet. 6. The heat exchange treatment method of the multi-mode volumetric heat exchange system according to any one of claims 1 to 3, wherein it is used to provide heat exchange only to the heating water supply circuit; the method is specifically: Operate the heat exchange treatment control unit of the volumetric heat exchanger to control the opening of the second electronically controlled on-off valve and the closing of the first electronically controlled on-off valve, and when the outlet water of the domestic hot water outlet pipe does not provide domestic hot water to the domestic hot water supply pipeline In the case of a positive displacement heat exchanger, the heat exchange processing control unit of the volumetric heat exchanger controls the electronically controlled flow control valve on the domestic cold water inlet pipe to stop according to the flow rate collected by the electronic flowmeter on the domestic hot water outlet pipe, so that the flow rate of the domestic cold water inlet pipe The water inlet channel is disconnected; at the same time, the water circulation pump of the heat source water supply unit and the heating water pump in the heating water supply circuit are turned on; Under the action of the water circulation pump of the heat source water supply device, the heat source water supply device provides hot water from the heat source water supply port through the heat source water supply inlet pipe to the heat source water supply heat exchange chamber of the volumetric heat exchanger, and at the same time, the heating water pump in the heating water supply circuit Under the action, the heating water in the heating water supply circuit enters the heating heat exchange coil of the volumetric heat exchanger from the heating return water inlet pipe, and then flows back from the heating water supply outlet pipe to the heating water supply circuit; The hot water flows through the position of the heating heat exchange coil to exchange heat with the heating water in the heating heat exchange coil, and then flows into the heat source and return water mixing cavity. The water outlet pipe flows back from the heat source water return port to the heat source water supplier.