CN206430403U - A kind of low-temperature air source heat harvester of band from the function that defrosts - Google Patents

Abstract

A low-temperature air-source heat collection device with a self-defrosting function, including multiple sets of parallel air-brine heat exchanger modules, a small water-source heat pump unit, and a piping system with corresponding functions. The low-temperature brine flows through the brine coil of the air-brine heat exchanger module, and absorbs heat in the air to provide a low-temperature heat source for the user-side water source heat pump unit. When a certain air-brine heat exchanger module needs defrosting, a small part of the low-temperature brine is diverted from the prepared brine main liquid supply pipe to the evaporator of the small water source heat pump unit, As the heat source of the small water source heat pump unit, the heat produced by the small water source heat pump unit enters the air-refrigerant heat exchanger module that needs to be defrosted through the brine to complete effective defrosting, thereby ensuring the air-brine heat exchange The device group can continuously and normally obtain heat from the air, and continuously provide low-temperature heat source for the water source heat pump unit on the user side to ensure the normal heating demand of the user.

Description

A low-temperature air source heat collection device with self-defrosting function

technical field

The invention relates to a low-temperature air source heat collection device with a self-defrosting function, which belongs to the field of heating and air conditioning.

Background technique

The air source heat pump unit is a kind of efficient refrigeration and heating equipment. In winter, the air-cooled heat exchanger is used to obtain heat from the outdoor air, and it is used as a low-temperature heat source of the heat pump unit to produce hot air or hot water. However, there is a problem of frosting in practical applications, especially in areas with low temperature and high humidity, and the frosting phenomenon of outdoor air-cooled heat exchangers is particularly serious. Existing defrosting schemes include refrigerant reverse defrosting, thermal storage defrosting, etc. Refrigerant reverse defrosting not only needs to obtain heat from the indoor heat exchanger, but also causes intermittent heating in the room, seriously affecting indoor comfort; hot gas bypass and Although thermal storage defrosting can slow down the fluctuation of indoor temperature, the heat of defrosting basically comes from the electric energy of the compressor, and the energy consumption of defrosting is large. Chinese patent (application number 201510779843.0) proposes to use the hot water produced by the heat pump unit to pass into the outdoor air-cooled heat exchange unit for defrosting. It is an effective defrosting method in the system, but it is not applicable to the decentralized heat pump heating system where the heat pump units are scattered at the remote user end, because the transmission distance is too large, the energy consumption of transmission and distribution is large, and the heat loss along the way Large, large thermal inertia, unable to defrost in time, etc.

For residential buildings and many office buildings, distributed heat pump systems are used for heating and air conditioning. The operation and adjustment are more convenient, which can realize individualized heating and air conditioning requirements, and contribute to the realization of behavioral energy conservation. The distributed heat pump system takes heat from the air in winter and also faces the problem of defrosting. Therefore, it is an important way to further develop and improve the energy efficiency of the distributed air source heat pump system by developing an air source heat collection device that can defrost in situ, has the characteristics of efficient continuous heating, and reliable operation.

Contents of the invention

Based on the above background, in view of the problems existing in the winter operation of distributed heat pump users, the present invention proposes a low-temperature air source heat collection device with self-defrosting function, which uses air-brine heat exchanger module groups to collect heat in the air Low-grade heat energy, and can realize high-efficiency defrosting of the air source heat exchanger on site, ensuring the continuous and normal heating demand of heat pump users.

The technical scheme of the present invention is as follows.

A low-temperature air-source heat collection device with self-defrosting function, including multiple sets of parallel air-brine heat exchanger modules, small water-source heat pump units, and piping systems to achieve corresponding functions, the parallel air-brine heat exchanger modules The inlet and outlet of the heat exchange coil of the refrigerant heat exchanger module are respectively equipped with a refrigerant inlet control valve, a heat outlet control valve, a defrosting inlet control valve, a defrosting outlet control valve, and air-refrigerant heat exchange. The valve on the brine inlet and outlet pipeline of the heat pump module can be a two-way valve or a three-way valve can be used instead of two two-way valves to switch between the pipelines. The refrigerant main liquid return pipe and the heat extraction control valve of the air-refrigerant heat exchanger module form a user heat extraction cycle loop, and the loop is provided with a valve and a heat extraction cycle pump. Set up a small water source heat pump unit matched with the air-refrigerant heat exchanger module, the evaporator of the small water source heat pump unit is respectively connected to the main liquid supply pipe of the refrigerant and the general return of the refrigerant through the branch pipe of the refrigerant. The liquid pipe is connected, and a heat extraction cycle pump is installed on the main liquid supply pipe of the refrigerant in the front section of the evaporator entering the small water source heat pump unit; the condenser of the small water source heat pump unit is connected with the air- The defrosting control valve of the brine heat exchanger module forms a defrosting circulation loop, and a defrosting circulation pump is arranged on the loop.

During heating in winter, when the outdoor temperature is relatively high, the small water source heat pump unit does not operate, the defrosting valve is automatically closed, the heat extraction valve is opened, and the low-temperature brine passes through the heat exchange coil of the air-brine heat exchanger module After absorbing the heat in the air, it is transported to the heat pump user along the main refrigerant liquid supply pipe under the drive of the heat extraction circulation pump, providing a low-temperature heat source for the heat pump user. The tube returns to the air-brine heat exchanger module to continue to take heat, and this cycle provides heat pump users with a continuous and stable low-temperature heat source.

When the outdoor temperature is relatively low and frost occurs in the air-refrigerant heat exchanger module after long-term operation, the small water source heat pump unit will automatically start and the defrosting valve will automatically open. The low-temperature brine passes through the heat exchange coil of the air-brine heat exchanger module, absorbs the heat in the air, and then enters the evaporator of the small water source heat pump unit through the refrigerant branch pipe along a small part of the brine main liquid supply pipe In the process, most of the rest is sent to the heat pump user to provide low-temperature heat source for the heat pump user. After releasing heat at the heat pump user, it returns to the air-refrigerant heat exchanger module to continue to take heat, and this cycle provides heat for the heat pump user. Provide a continuous and stable low-temperature heat source. At the same time, the low-temperature brine that enters the evaporator of the small water-source heat pump unit releases heat in the evaporator, and acts as a low-temperature heat source for the small water-source heat pump unit. Driven by the pump, it enters the air-brine heat exchanger module that needs to be defrosted through the defrosting control valve, releases heat and defrosts, and then returns to the condenser of the small water source heat pump unit to continue absorbing heat for the next round of defrosting prepare for. In this way, it is ensured that when part of the air-brine heat exchanger modules are defrosting, some air-brine heat exchanger modules can work normally to ensure the heat demand of heat pump users.

The present invention has the following prominent advantages and remarkable technical effects.

1) This device uses the air-refrigerant heat exchanger module group to collect low-grade heat energy in the air, which can ensure continuous and uninterrupted supply of low-temperature heat source for the user-side water source heat pump unit to meet the needs of distributed heat pump users, and The transmission and distribution of low-temperature heat sources does not require pipeline insulation, which can greatly reduce the cost of the pipeline system and save investment.

2) The modular combination of multiple sets of air-refrigerant heat exchangers can ensure that the normal heating of the user will not be affected under the defrosting condition.

3) This device can be used in conjunction with natural energy collection devices such as cooling towers and buried pipe heat exchangers to achieve high efficiency in both heating and cooling.

In general, the present invention provides a low-temperature air source heat collection device that can ensure continuous and efficient heat collection, and solves the problem of high heat preservation cost of the brine transmission and distribution pipeline system, providing heat pump users with a continuous and stable Reliable low temperature heat source.

Description of drawings

Fig. 1 is a schematic diagram of the body structure of a low-temperature air source heat collection device with self-defrosting function disclosed by the present invention.

Fig. 2 is a schematic diagram of the air-brine heat exchanger module continuously providing low-temperature brine for heat pump users in the present invention.

Fig. 3 is a schematic diagram of the defrosting mode of the air-brine heat exchanger module in the present invention.

Fig. 4 is a structural schematic diagram of an embodiment of a low-temperature air source heat collection device with self-defrosting function combined with natural energy collection devices such as cooling towers and buried pipe heat exchangers according to the present invention.

The names of the components marked in the figure are as follows: 3-air-refrigerant heat exchanger module; 3a-air-refrigerant heat exchanger module being defrosted; 3b-air-refrigerant heat exchanger for normal heating Module; 6- defrosting circulation pump; 7- small water source heat pump unit; 8- evaporator side heat extraction control valve; 9- refrigerant coil; 14- condenser; 15- heat extraction circulation pump; 16- evaporator ;17-Branch coolant branch pipe; 18-Brain coolant main liquid supply pipe; 19-Distributed heat pump user; 20-Brain coolant main liquid return pipe; 21-Brain coolant defrosting pipeline; 22-Other available Natural energy collection device; 1, 4, 10, 12 - heat extraction control valve; 2, 5, 11, 13 - defrosting control valve.

detailed description

Below in conjunction with accompanying drawing, structure, working principle and mode of operation of the present invention are further elaborated:

Fig. 1 is a schematic diagram of the body structure of a low-temperature air source heat collection device with self-defrosting function disclosed by the present invention. A low-temperature air source heat collection device with self-defrosting function, including multiple sets of parallel air-brine heat exchanger modules 3, small water source heat pump units 7, and piping systems for realizing corresponding functions. The parallel air - The inlet and outlet of the heat exchange coil 9 of the brine heat exchanger module 3 are respectively equipped with brine heat-taking inlet control valves 1 and 4, heat-taking outlet control valves 10 and 12 and defrosting inlet control valves 2 and 5, The defrosting outlet control valves 11, 13, the valves 1, 2, 4, 5, 10, 11, 12, 13 on the brine inlet and outlet pipelines of the air-brine heat exchanger module 3 can be two-way valves or A three-way valve can be used instead of two two-way valves to switch between pipelines. The heat pump user 19 communicates with the air-brine heat exchanger through the brine main liquid supply pipe 18 and the brine main liquid return pipe 20. The heat-taking control valves 1, 4, 10, and 12 of the module 3 form a user heat-taking circulation loop, and a valve and a heat-taking circulation pump 15 are arranged on the loop. The small water source heat pump unit 7 matched with the heater module 3, the evaporator 16 of the small water source heat pump unit 7 is respectively connected to the main refrigerant supply pipe 18 and the main refrigerant return pipe 20 through the brine branch pipe 17, In addition, a heat-taking cycle pump 15 is provided on the front end brine main liquid supply pipe 18 of the evaporator 16 entering the small water source heat pump unit 7; the condenser 14 of the small water source heat pump unit 7 passes through the brine defrosting pipeline 21 It forms a defrosting circulation loop with the defrosting control valves 2, 5, 11, and 13 of the air-brine heat exchanger module 3, and a defrosting circulation pump 6 is arranged on the loop.

Fig. 2 is a schematic diagram of the air-brine heat exchanger module continuously providing low-temperature brine for heat pump users in the present invention. During heating in winter, when the outdoor temperature is relatively high, the small water source heat pump unit 7 does not operate, the defrosting valve is automatically closed, the heat extraction valve 1/4/10/12 is opened, and the low-temperature brine is exchanged through air-brine The heat exchange coil 9 of the heater module 3, after absorbing the heat in the air, is driven by the heat-absorbing circulation pump 15 and transported to the heat pump user 19 along the brine main liquid supply pipe 18 to provide the heat pump user 19 with a low-temperature heat source. After the heat pump user 19 releases heat, it returns to the air-brine heat exchanger module 3 along the brine main liquid return pipe 20 to continue to take heat, and this cycle provides a continuous and stable low-temperature heat source for the heat pump user 19. Since the low-temperature heat source is delivered to the heat pump user 19, no pipeline insulation is required, which can greatly reduce the cost of the pipeline system and save investment.

Fig. 3 is a schematic diagram of the heat extraction and defrosting mode of the air-brine heat exchanger module in the present invention. During heating in winter, when the outdoor air temperature is relatively low and frost occurs in the air-brine heat exchanger module 3 after long-term operation, the small water source heat pump unit 7 is automatically started, and the defrosting valve is automatically opened. The low-temperature brine passes through the heat exchange coil 9 of the air-brine heat exchanger module 3b, absorbs the heat in the air, and then enters the small water source heat pump through the refrigerant branch pipe 17 along a small part of the brine main liquid supply pipe 18 In the evaporator 16 of the unit 15, most of the remaining is sent to the heat pump user 19 to provide a low-temperature heat source for the heat pump user 19. After the heat is released at the heat pump user 19, it returns to the air-brine heat exchanger module 3b to continue The heat is taken, and this cycle is used to provide a continuous and stable low-temperature heat source for the heat pump user 19. At the same time, the low-temperature brine that enters the evaporator 16 of the small water source heat pump unit 7 releases heat in the evaporator 16, and serves as a low-temperature heat source for the small water source heat pump unit 7, and the high temperature brine produced by the small water source heat pump unit 7 Driven by the defrosting circulation pump 6, the refrigerant enters the air-brine heat exchanger module 3a that needs to be defrosted through the defrosting control valve 2, releases heat and defrosts, and then returns to the condenser 14 of the small water source heat pump unit 7 Continue to absorb heat to prepare for the next round of defrosting. In this way, it is ensured that when part of the air-brine heat exchanger module 3a is defrosted, the air-brine heat exchanger module 3b can work normally to ensure the heat demand of the heat pump user 19 .

Fig. 4 is a structural schematic diagram of an embodiment of a low-temperature air source heat collection device with self-defrosting function combined with natural energy collection devices such as cooling towers and buried pipe heat exchangers according to the present invention. Among them, other natural energy collection devices can be commonly used underground pipe heat exchangers, cooling towers, solar collectors, etc., combined with a low-temperature air source heat collection device with self-defrosting function of the present invention in a series or parallel manner run. Taking the combination of a low-temperature air source heat collection device with self-defrosting function and a cooling tower as an example to illustrate its operating principle.

The combination of a low-temperature air source heat collection device with a self-defrosting function and a cooling tower in the present invention can realize high efficiency of heating and cooling for heat pump users. When the heat pump user 19 needs cooling in summer, the air-brine heat exchanger module 3 and the small water source heat pump unit 7 stop running, and the cooling tower 22 runs. The cooling water from the heat pump user 19 enters the cooling tower 22 to dissipate heat under the action of the water pump 15. After the water temperature drops, it returns to the condenser of the heat pump user 19 along the pipeline to continue to take away the heat of condensation, ensuring the efficient cooling of the heat pump user 19. When heating is required in winter, the cooling tower 22 is closed, and the air-brine heat exchanger module 3 and the small water source heat pump unit 7 start to operate normally, completing the heat extraction or defrosting process from the air, ensuring continuous heat pump users 19 provides a low-temperature heat source.

Claims (2)

1. a kind of band exchanges heat from the low-temperature air source heat harvester for the function that defrosts, including multigroup air in parallel-refrigerating medium Device module（3）, small-size water source heat pump unit（7）And realize the pipe-line system of corresponding function, the air-refrigerating medium in parallel Heat exchanger module（3）Heat exchange coil（9）Import and export are separately installed with refrigerating medium and take hot in-let dimple valve（1）、（4）, take heat Control of export valve（10）、（12）And defrosting in-let dimple valve（2）、（5）, defrosting outlet control valve（11）、（13）, it is empty Gas-refrigerating medium heat exchanger module（3）Refrigerating medium the import and export pipeline on valve（1）、（2）、（4）、（5）、（10）、（11）、 （12）、（13）Can be that two-way valve can also replace two two-way valves to realize the switching between pipeline, heat pump with a triple valve User（19）Pass through the total feed pipe of refrigerating medium（18）With the total liquid back pipe of refrigerating medium（20）With air-refrigerating medium heat exchanger module（3） Take thermal control valve（1）、（4）、（10）、（12）Constitute user and take thermal cycle loop, valve is provided with the loop and heat is taken Circulating pump（15）, it is characterised in that one and the air-refrigerating medium heat exchanger module are set（3）Supporting small-sized water source heat Pump assembly（7）, the small-size water source heat pump unit（7）Evaporator（16）Pass through refrigerating medium branch pipe（17）It is total with refrigerating medium respectively Feed pipe（18）With the total liquid back pipe of refrigerating medium（20）Connection, and entering small-size water source heat pump unit（7）Evaporator（16）'s The total feed pipe of leading portion refrigerating medium（18）Upper setting takes hot recycle pump（15）；The small-size water source heat pump unit（7）Condenser （14）Pass through refrigerating medium defroster duct（21）With air-refrigerating medium heat exchanger module（3）Defrosting control valve（2）、（5）、 （11）、（13）Constitute and be provided with defrosting circulating pump on defrosting circulation loop, the loop（6）.

The low-temperature air source heat harvester of function 2. a kind of band according to claim 1 defrosts certainly, it is characterised in that It is used for air-refrigerating medium heat exchanger the module for gathering low-temperature heat source in the present apparatus（3）, can also be with same collection low-temperature heat source Natural energy resources harvester（22）（Including following specific constructive form：Cooling tower, underground pipe, solar thermal collector）Series connection or It is used in parallel.