CN109990494A - High-efficiency and energy-saving solar water supply system and its control method - Google Patents

Abstract

The invention belongs to the technical field of water supply, and discloses a high-efficiency and energy-saving solar water supply system and a control method thereof, comprising a plurality of solar thermal collectors, a user water tank collecting the water output of the plurality of solar thermal collectors, and a controller for controlling the water supply system, The water outlet of the user water tank is connected with at least one water intake branch and a return water pipeline. The water intake branch is provided with a water intake pipe group. The solar collector water inlet is connected to the municipal pipe network. The municipal pipe network and the user water tank are indirectly used to deliver hot water to the user water tank. The electric heating device is equipped with on-off valves between the municipal pipe network and the water inlet of the solar collector, between the solar collector and the user's water tank, and between the user's water tank and the electric heating device. The solar collector and the user's water tank are equipped with temperature sensors. , the on-off valve and the temperature sensor are all electrically connected to the controller. The temperature of the solar collector and the user's water tank is monitored in real time by the temperature sensor and fed back to the controller, and the controller selects the best hot water supply method to ensure efficient hot water supply.

Description

High-efficiency and energy-saving solar water supply system and its control method

technical field

The invention relates to the technical field of water supply, in particular, to a high-efficiency and energy-saving solar water supply system and a control method thereof.

Background technique

Existing building hot water systems generally use a single heating method, which cannot automatically activate different heating methods according to changes in the temperature environment, resulting in high energy consumption. , the water use effect is poor; only setting up multiple solar collectors in series on the roof, lack of effective temperature and water level control strategies, will also lead to unreasonable application of solar energy; lack of linkage with secondary booster equipment, resulting in energy consumption Increase with water effect becomes worse.

SUMMARY OF THE INVENTION

The technical problem solved by the present invention is to overcome the defects of the prior art and provide a high-efficiency and energy-saving solar water supply system that can select a heating method in real time to effectively ensure that the user's water tank is at an ideal temperature.

The present invention also provides a control method based on the high-efficiency and energy-saving solar water supply system.

The object of the present invention is achieved through the following technical solutions:

A high-efficiency and energy-saving solar water supply system comprises a plurality of solar thermal collectors that independently collect heat, a user water tank that collects the water volume of the water outlets of the plurality of solar thermal collectors, and a controller that controls the operation of the entire water supply system, and the user water tank water outlet is connected with a At least one water intake branch and return water pipeline, the water intake branch is provided with a water intake pipe group, and the solar collector water inlet is connected to the municipal pipe network. The electric heating device is connected, and there are switch valves between the municipal pipe network and the water inlet of the solar collector, between the solar collector and the user's water tank, and between the user's water tank and the electric heating device. The water tanks are all equipped with temperature sensors, and the on-off valve and the temperature sensors are all electrically connected to the controller.

Further, a water level sensor and a water level alarm are arranged on the user's water tank, and the water level sensor and the water level alarm are electrically connected with the controller.

Further, a liquid separation valve is provided between the on-off valve of the water outlet of the solar collector and the user's water tank.

Further, a tail water temperature sensor and a tail water switch valve are arranged in sequence on the return water pipeline, the tail water temperature sensor is arranged close to the water intake pipe group, and the tail water temperature sensor and the tail water switch valve are both electrically connected to the controller.

Further, a secondary booster pump is arranged between the water intake pipe group and the user's water tank.

Further, a buffer water tank is also arranged between the solar heat collector and the municipal pipe network, and the buffer water tank is provided with an air supply pipeline and an air supply switch valve.

Further, the controller is a PLC controller.

A control method of the above-mentioned high-efficiency and energy-saving solar water supply system, specifically: setting threshold values for the water temperature in the solar collector and the user's water tank, and a temperature sensor monitors the water temperature of the solar collector and the user's water tank in real time and feeds back To the controller, the controller sends opening and closing commands to the on-off valves connected to the water inlet or water outlet of each solar collector or to the electric heating device according to the real-time water consumption.

Further, a plurality of water level thresholds are set for the user water tank. By setting a water level sensor on the user water tank, the controller sends an opening and closing command to the switch valve connected to the water outlet of each solar collector according to the real-time water level information provided by the water level sensor.

Further, the temperature of the water in the return pipe is monitored and switched on and off, and the water temperature is compared with the required water temperature of the water intake pipe group to obtain a comparison value, and a comparison threshold is set, and the controller is based on the comparison of the comparison value and the comparison threshold. Send the opening and closing command to the switch of the return water line.

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

1) Adopting the strategy of "temperature priority", the temperature of the solar collector and the user's water tank is monitored in real time by the temperature sensor and fed back to the controller, and the controller selects and activates the best hot water supply method to ensure a stable and efficient Provide hot water to the user's water tank while ensuring the water supply temperature;

2) Set the tail water temperature sensor. By setting a comparison threshold between the tail water temperature and the required water temperature of the water intake pipe group in advance, only return water to the return water pipeline whose temperature is lower than the comparison threshold, which can effectively reduce the amount of return water and save energy;

3) A water level sensor is set on the user's water tank, which can feed back its water volume to the controller in real time, so that the controller can timely select the opening number of the solar collector on-off valve to inject water into the user's water tank to form the best water injection method, so as to improve the transmission rate within a reasonable range. Thermal efficiency;

4) A secondary booster pump is added. During the water return process, by monitoring the output pressure of the secondary booster pump, the water return process can be controlled immediately and the water pressure can be stabilized;

5) The buffer water tank between the solar collector and the municipal pipe network can reduce the pipeline pressure when the total volume of the water medium is large, and at the same time, the internal pressure of the pipeline can be adjusted in real time through the air supply switch valve to ensure the entire pipeline The working pressure is always within the normal range.

Description of drawings

FIG. 1 is a schematic structural diagram of the high-efficiency and energy-saving solar water supply system according to Embodiment 1. FIG.

Detailed ways

The present invention will be further described below in conjunction with the specific embodiments, wherein, the accompanying drawings are only used for exemplary description, and are only schematic diagrams, not physical drawings, and should not be construed as restrictions on this patent; in order to better illustrate the present invention In the embodiments, some components in the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; it is understandable to those skilled in the art that some well-known structures and their descriptions in the drawings may be omitted.

Example 1

As shown in FIG. 1, an efficient and energy-saving solar water supply system is provided, which includes a plurality of solar thermal collectors 1 installed independently on the roof of a building to collect heat, and a user that collects the water output of the plurality of solar thermal collectors 1. The water tank 2 and the controller (not shown) that controls the operation of the entire water supply system, each solar collector 1 has an independent cold water inlet and a hot water outlet, and the water outlet of the user's water tank 2 is connected with a plurality of water intake branches 3 and devices. In the return water pipeline 31 at the end of each water intake branch, the water intake branch 3 is provided with a water intake pipe group 32, and the water from the cold water inlet of the solar collector 1 is injected from the municipal pipe network 4, between the municipal pipe network 4 and the user water tank 2 By setting the electric heating device 5 for directly delivering hot water to the user's water tank, the connection between the municipal pipe network 4 and the water inlet of the solar collector 1, between the solar collector 1 and the user's water tank 2, and between the user's water tank 2 and the electricity There is an on-off valve A between the heating devices 5, each solar collector 1 and the user water tank 2 are equipped with a temperature sensor B, and the on-off valve A and the temperature sensor B are all electrically connected to the controller. Among them, the municipal pipe network 4 The switch valve between the solar collector 1 and the water inlet is A1, the switch valve between the solar collector 1 and the user's water tank 2 is A2, and the switch valve between the user's water tank 2 and the electric heating device 5 is A3.

Specifically, the switch valve A2 is set between each solar collector 1 and the user's water tank 2 mainly because the temperature of the solar collector is uncontrollable, which is likely to cause problems such as low heat conversion efficiency. When the water outlet of the collector 1 discharges water at the same time, there may be a potential risk that the water level of the user's water tank 2 is too high.

The on-off valve A can perform circulation and cut-off operations for each water flow branch in time. Specifically, the on-off valve is controlled by the controller according to the information transmitted by the temperature sensor. All solar collectors meet the water discharge conditions under the premise of meeting the temperature requirements (the water temperature in the solar collector is lower than 90 degrees and higher than 15 degrees). Fill the user tank.

The water supply system adopts the strategy of "temperature priority", and the temperature of the solar collector 1 and the user's water tank 2 is monitored by the temperature sensor B in real time and fed back to the controller. To ensure stable and efficient supply of hot water to the user's water tank, while ensuring the temperature of the water supply.

A liquid separation valve 6 is arranged between the on-off valves of the multiple solar collectors 1 and the user water tank 2. The water at the water outlet of the solar thermal collectors 1 will first pass through the liquid separation valve 6 for concentration, and then enter the user water tank. 2.

Each solar thermal collector 1 is provided with a water level sensor (not shown), the water level sensor is electrically connected with the controller, and the controller is also electrically connected with a touch screen (not shown), the user can set the solar thermal collector through the touch screen The maximum and minimum water levels of the upper water level sensor.

In order to ensure the reliability and stability of the user's water use, the user's water tank 2 is also provided with a pressure sensor, a water level sensor and a water level alarm (all not shown), and the pressure sensor, the water level sensor and the water level alarm are all electrically connected to the controller.

Generally, the water level of the user's water tank 2 is set to 6 levels: extremely low water level, sub-low water level, low water level, high water level, extremely high water level, and overflow water level. Set up on the touch screen.

When the water levels of the user's water tank 2 are at different levels, the user's water tank 2 can be filled with water by opening different numbers of on-off valves A2. Of course, the number of on-off valves A2 opened is allocated by the controller. When the user's water tank reaches the overflow level When the water level alarm is turned on, the alarm mode is turned on, and the controller receives the alarm information and closes all the on-off valves A2 for water injection.

Since the working pressure range of the pipeline is related to the height of the floor and the number of users, in order to ensure the stability of the user's water intake, a secondary booster pump 7 can be added between the water intake pipe group 32 and the user's water tank 2, so that the water in the user's water tank can reach the water intake pipe group smoothly. terminal.

The return water pipeline 31 is a pipeline that directly discharges water to the user's water tank 2. The return water pipeline 31 is provided with a tail water temperature sensor C and a tail water switch valve D in sequence, and the tail water temperature sensor D is arranged close to the water intake pipe group 32. Both the water temperature sensor C and the tail water switch valve D are electrically connected to the controller.

Generally, the tail water temperature sensor C monitors the water temperature at the water intake pipe group 32 in real time. When the measured water temperature is lower than the water temperature of the user's water tank and reaches a certain threshold, the tail water switch valve D can be opened for direct discharge. When it is higher than this threshold, the tail water switch valve D is closed. In addition, when the water outlet pressure of the secondary booster pump 7 is lower than its set reasonable pressure threshold, the tail water switch valve D also needs to be closed.

The user water tank 2 has a plurality of water inlets, which are the water inlet 1 21 for hot water injection in the power supply heating device 5, the water inlet 2 22 for the hot water injection in the separator valve 6, and the water inlet for direct drainage of multiple return water pipelines. A plurality of water inlets three 23.

A booster pump 8 is arranged between the municipal pipe network 4 and the solar collector 1 to ensure the injection pressure of the water source, and a buffer water tank 9 located at a high position is also arranged between the booster pump 8 and the solar collector 1. The buffer water tank In order to seal the box, the buffer water tank is provided with an air supply pipeline, an air supply switch valve and a pressure gauge.

The buffer water tank 9 can reduce the pressure of the pipeline on the booster pump 8 when the total volume of the water medium is large, and the air supply switch valve can control the switch according to the test result of the pressure gauge in the buffer water tank, and the pressure on the booster pump can be adjusted in real time. The internal pressure of the pipeline ensures that the working pressure in the entire pipeline from the solar collector to the booster pump is always kept within the normal range, and the entire water supply system always operates efficiently in a reasonable manner.

The controller in this embodiment is a PLC controller, the on-off valves are all solenoid valves, the controller is connected to the LORA module, and the LORA module is connected to a remote server, and the entire heating system can be in a state of precise control.

Example 2

This embodiment provides a control method for a high-efficiency and energy-saving solar water supply system based on Embodiment 1, which specifically includes: setting the threshold values of the water temperatures in the solar collector 1 and the user's water tank 2 respectively through a touch screen, wherein the solar collector 1 The temperature threshold is to distinguish whether the water temperature is suitable for injection into the user water tank. The temperature threshold of the user water tank is to distinguish whether the water temperature in the user water tank reaches the required water temperature. The temperature sensor B monitors the water temperature of the solar collector 1 and the user water tank 2 in real time and feeds back To the controller, the controller sends an opening and closing command to the switch valve A1 at the water inlet of each solar collector 1 or the switch valve A2 at the water outlet or a working command to the electric heating device 5 according to the real-time water consumption.

Specifically, when the solar energy is sufficient and the water temperature in the solar collector 1 meets the set temperature requirement (the water temperature in the solar collector is lower than 90 degrees and higher than 15 degrees), the on-off valve A1 at the water inlet and its Both the on-off valves A2 and the liquid separation valve 6 are opened, and the hot water is injected into the user's water tank 2. At this time, the on-off valve A3 at the electric heating device 5 is closed. When the water temperature in the solar collector 1 does not meet the set temperature requirements, the booster pump 8 is turned off, and the switching valves A1 and A2 at both ends of the solar collector 1 are closed. The heating device supplies hot water to the user's water tank.

In order to keep the user water tank 2 in a controllable state, multiple water level thresholds can be set for the user water tank through the touch screen, that is, the water level ranges of extremely low water level, sub-low water level, low water level, high water level, extremely high water level and overflow water level can be set respectively. The water level sensor on the user's water tank monitors its water level information in real time, and the controller sends an opening and closing command to the switch valve A2 connected to the water outlet of each solar collector according to the real-time water level information.

When the water level of the user's water tank is at the extremely low water level, the second low water level, the low water level and the high water level, open the switch valve A2 at the water outlet of different numbers of solar collectors to discharge water to the user's water tank. Generally, the following principles can be followed: When the water level is at a very low water level, open all the on-off valves A2 to discharge water. When the water level is at the next low level, open 2/3 of the total on-off valves at the water outlet of the solar collector to discharge water. When the water level is low, turn on 1/3 of the total on-off valves. When the water is discharged, close all on-off valves A2 when the water level is high or extremely high, and when the overflow water level is reached, the water level alarm will turn on the alarm.

The control method also aims to monitor and switch the temperature of the water in the return pipeline, and compare the real-time water temperature at 32 locations of the water intake pipe group measured by the temperature sensor A with the required water temperature of the water intake pipe group to obtain a comparison value. A comparison threshold is set on the touch screen, and the controller sends an opening and closing command to the switch of the return pipe according to the comparison between the comparison value and the comparison threshold.

Generally, the comparison threshold can be set to 6°C and above, that is, when the water temperature measured by the tail water temperature sensor C is lower than the required water temperature of the water intake pipe group (that is, the temperature of the user's water tank) by 6°C, the tail water switch valve D is opened. At other temperature values, the tail water switch valve D is closed.

Of course, when the water outlet pressure of the secondary booster pump 7 is lower than the set reasonable pressure threshold, the tail water switch valve D also needs to be closed.

The opening and closing of the switch valve A1 between each solar collector 1 and the buffer water tank 9 is controlled by the controller according to the water level and temperature in the solar collector. When the water level is the lowest, the switch valve A1 is opened to inject water into the solar collector 1; secondly, when the water level in the solar collector 1 reaches the highest water level or the water temperature is lower than 4°C for a long time, the switch valve A1 is closed. , stop the water injection into the solar collector.

Obviously, the above-mentioned embodiments are only examples for clearly illustrating the technical solutions of the present invention, and are not intended to limit the embodiments of the present invention. For those of ordinary skill in the art, changes or modifications in other different forms can also be made on the basis of the above description. There is no need and cannot be exhaustive of all implementations here. Any modifications, equivalent replacements and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims (10)

1. a kind of energy-efficient solar water supply system, which is characterized in that including multiple independent solar energy collection for collecting heat The controller of hot device, user's water tank of the multiple solar thermal collector water outlet waters of convergence and the entire water system operation of control, User's water outlet of water tank is connected at least one water intaking branch and water return pipeline, and water intaking branch is equipped with intake pipe group, solar energy Heat collector water inlet is connected with city planting ductwork, defeated for directly past user's water tank by setting between city planting ductwork and user's water tank The electric heater unit of hot water is sent to be connected, between city planting ductwork and solar thermal collector water inlet, solar thermal collector and user's water Between case, switch valve is equipped between user's water tank and electric heater unit, each solar thermal collector, user's water tank are equipped with Temperature sensor, switch valve, temperature sensor are electrically connected with the controller.

2. energy-efficient solar water supply system according to claim 1, which is characterized in that user's water tank is equipped with water Level sensor and water level alarm, water level sensor and water level alarm are electrically connected with the controller.

3. energy-efficient solar water supply system according to claim 1, which is characterized in that solar thermal collector water outlet Liquid separatnig valve is equipped between the switch valve and user's water tank of mouth.

4. energy-efficient solar water supply system according to claim 1, which is characterized in that successively set on water return pipeline Have a tail water temperature sensor and tail water switch valve, tail water temperature sensor is arranged close to intake pipe group, tail water temperature sensor with Tail water switch valve is electrically connected with the controller.

5. energy-efficient solar water supply system according to claim 4, which is characterized in that intake pipe group and user's water Secondary booster pump is equipped between case.

6. energy-efficient solar water supply system according to claim 1, which is characterized in that solar thermal collector and city Buffer tank is additionally provided between political affairs pipe network, buffer tank is equipped with tonifying Qi pipeline and tonifying Qi switch valve.

7. energy-efficient solar water supply system according to claim 1, which is characterized in that controller is PLC control Device.

8. a kind of control method of the energy-efficient solar water supply system as described in claim 1~7 any one, special Sign is, carries out threshold value setting, temperature sensor real-time monitoring solar energy to water temperature in solar thermal collector, user's water tank respectively Heat collector, user's water tank water temperature and feed back to controller, controller with regimen condition to each solar thermal collector according to being entered in real time At the mouth of a river or the switch valve of water outlet connection issues opening and closing instruction or issues work order to electric heater unit.

9. the control method of energy-efficient solar water supply system according to claim 8, which is characterized in that user Water tank sets multiple watermark thresholds, and by the way that water level sensor is arranged on user's water tank, controller is provided according to water level sensor The switch valve that is connected to each solar thermal collector water outlet of real time water level information issue opening and closing instruction.

10. the control method of energy-efficient solar water supply system according to claim 8, which is characterized in that return The water of water lines carries out temperature monitoring and switch control, and compared with water temperature is compared and is obtained with intake pipe group demand water temperature Value, sets a comparison threshold value, and controller is issued according to the comparable situation of fiducial value threshold value compared with to the switch of water return pipeline Opening and closing instruction.