Lake water natural cold source coupling heat pump cooling and heating system

Abstract

A lake water natural cold source coupling heat pump cooling and heating system comprises a lake water source; the plate heat exchanger is connected with a lake water source through a lake water supply and return pipeline; the water source heat pump unit comprises a first heat exchanger, a compressor, a second heat exchanger and a throttle valve which are sequentially connected to form a refrigerant circulation loop; the user side is connected with the plate heat exchanger and the first heat exchanger through a user water supply and return pipeline; a lake water source is connected with the plate heat exchanger and the second heat exchanger to form a lake water circulation loop, and the plate heat exchanger is connected with the water source heat pump unit through a water supply and return pipeline to form a heat pump circulation loop. According to the system, the functions of lake water natural cold source cooling, lake water natural cold source and heat pump combined cooling and water source heat pump cooling and heating are achieved by arranging opening and closing control of a plurality of valves. According to the system, the problem of high energy consumption of an air conditioning system is solved through flexible switching between direct cooling of a lake water natural cold source and cooling coupled with a heat pump, and stable and efficient operation of the system is guaranteed by using lake water as a cold and heat source.

Description

TECHNICAL FIELD

[0001] The utility model relates to a heating ventilation air conditioning system technical field, especially a lake water natural cold source coupling heat pump cooling and heating system. BACKGROUND

[0002] With the expansion of building scale and the extension of air conditioning use time, the heating ventilation air conditioning system has become the necessary facility in people's life, and plays an important role in creating comfortable indoor environment. However, the heating ventilation air conditioning system inevitably needs to consume a large amount of energy in the operation process, and the energy consumption accounts for more than 50% of the total building operation energy consumption. Therefore, improving the energy efficiency of the heating ventilation air conditioning system and reducing the energy consumption is an important way to reduce building energy consumption and carbon dioxide emission.

[0003] At present, in order to create a suitable temperature and humidity environment for civil buildings, mechanical refrigeration air conditioning system or air source heat pump system is mainly used. The mechanical refrigeration system has high energy consumption, and the configuration of the traditional large-scale building refrigeration air conditioning system is complex and has large investment cost. Although the air source heat pump system uses the heat in the air as the main energy, due to the lower specific heat capacity of air than water, the efficiency of the air source heat pump is relatively low. Therefore, it is urgent to carry out technical innovation for the single cold and heat source of the air conditioning system to improve the efficiency of the air conditioning system, reduce the energy consumption and carbon dioxide emission. SUMMARY

[0004] The utility model aims at providing a lake water natural cold source coupling heat pump cooling and heating system, aiming at the problems of single operation mode, high dependence on mechanical refrigeration and low utilization efficiency of natural resources of the existing heating ventilation air conditioning system, through the coupling operation of lake water natural cold source and heat pump system, flexible switching of multiple modes such as lake water natural cold source cooling, combined cooling and heat pump heating, significantly improving the operation efficiency of the air conditioning system, reducing the energy consumption, realizing the efficient utilization of natural resources and meeting the needs of building heating ventilation air conditioning system for energy saving and stable operation.

[0005] The technical scheme of the utility model is realized as follows:

[0006] A lake water natural cold source coupling heat pump cooling and heating system comprises three mutually coordinated subsystems:

[0007] The lake water natural cold source air conditioning system connected with the user end to form a cooling circuit, through the opening and closing state control of each valve, the cold quantity of the lake water natural cold source is directly supplied to the user end, realizing the efficient utilization of natural resources and reducing the energy consumption of the cooling system;

[0008] The lake water natural cold source and heat pump coupling system connected with the user end to form a cooling circuit, when the lake water temperature is insufficient to directly cool, through the double heat exchange mode of plate heat exchanger precooling and heat pump deep refrigeration, the advantages are complementary and work cooperatively;

[0009] The water source heat pump system connected with the user end forms a cold and heat supply circuit, and is used for guaranteeing that the system can meet the cold and heat demand of the user end when the natural cold source temperature is high or heat supply is needed.

[0010] Further, the lake water natural cold source air conditioning system comprises a first water pump, a first filter, a first flow meter, a first temperature sensor, a first pressure gauge, a plate heat exchanger, a water supplementing device and an exhaust device, the plate heat exchanger is connected with the first water supply pipeline and the first return water pipeline between the lake water source, the first water supply pipeline is provided with the first water pump, the first filter, the first flow meter, the first valve, the first temperature sensor and the first pressure gauge; the first return water pipeline is provided with a second pressure gauge, a second temperature sensor and a fourth valve. The plate heat exchanger is connected with the second water supply pipeline and the second return water pipeline between the user end, the second water supply pipeline is provided with a second valve, a fifteenth valve and a third temperature sensor; the second return water pipeline is provided with a third valve, a radio frequency water treatment device and a fourth temperature sensor, the second return water pipeline is communicated with the first branch of municipal water supply through the radio frequency water treatment device, the second water pump and an expansion tank, and the first branch of municipal water supply is provided with a water supplementing valve.

[0011] In the utility model, the "water supply and return pipeline" refers to the collective term of the water supply pipeline and the return water pipeline for conveying water medium in the system, including but not limited to the first water supply pipeline and the first return water pipeline, the second water supply pipeline and the second return water pipeline, the third water supply pipeline and the third return water pipeline, the fourth water supply pipeline and the fourth return water pipeline, the fifth water supply pipeline and the fifth return water pipeline and the sixth water supply pipeline and the sixth return water pipeline. The "refrigerant circulation loop" refers to the closed circulation passage formed by the first heat exchanger, the compressor, the second heat exchanger and the throttling valve in the water source heat pump unit in sequence, wherein the circulating working medium is the refrigerant.

[0012] Further, the lake water natural cold source and heat pump coupling system comprises a plate heat exchanger, a water source side heat exchanger, a user side heat exchanger, a first water pump, a first filter, a first flow meter, a first temperature sensor, a first pressure gauge, a water supplement device and an exhaust device. The lake water source is connected with the plate heat exchanger through a third water supply pipeline and a third water return pipeline. The lake water source enters the plate heat exchanger for heat exchange under the action of the first water pump and the first filter. The opening and closing state of a seventh valve on the third water supply pipeline is set, so that the water medium enters the water source side heat exchanger for heat exchange, and then returns to the lake water source through the third water return pipeline. The plate heat exchanger is connected with the user end through a fourth water supply pipeline and a fourth water return pipeline. The fourth water supply pipeline is provided with a heat pump unit. The heat pump unit comprises the water source side heat exchanger, the user side heat exchanger, a compressor and a throttling valve. The water medium pre-cooled by the plate heat exchanger enters the water source side heat exchanger for further cooling, and then is sent to the user end for cooling supply. The cooled water medium returns to the plate heat exchanger through the fourth water return pipeline. The fourth water return pipeline is provided with a second flow meter, a radio frequency water processor and a third valve. The radio frequency water processor is connected with a first branch of municipal water supply for water supplement of the system.

[0013] Further, the water source heat pump system comprises a water source side heat exchanger, a user side heat exchanger, a compressor, a throttling valve, a water supplement device and an exhaust device. The water source side heat exchanger is connected with the lake water source through a fifth water supply pipeline and a fifth water return pipeline. The lake water source enters the water source side heat exchanger for heat exchange under the action of the first water pump and the first filter. The fifth valve and the eighth valve on the fifth water supply pipeline are opened, so that the water medium enters the water source side heat exchanger for heat exchange, and then returns to the lake water source through the fifth water return pipeline. The fifth water return pipeline is provided with a twelfth valve. The user side heat exchanger is connected with the user end through a sixth water supply pipeline and a sixth water return pipeline. The water medium is cooled or heated in the user side heat exchanger through the opening of the seventeenth valve on the sixth water supply pipeline. The sixth water return pipeline is provided with a second flow meter and a radio frequency water processor. After flowing through the radio frequency water processor, the sixth water return pipeline is divided into two branches. The sixteenth valve is arranged on the first branch of the sixth water return pipeline. The water medium returns to the user side heat exchanger after the opening of the sixteenth valve. The tenth valve and the fifteenth valve on the second branch of the sixth water return pipeline are opened. The water medium in the sixth water supply pipeline is mixed and then sent to the user end for cooling supply.

[0014] Further, the water supplement device and the exhaust device are provided. The water supplement device adopts an expansion tank with a water supplement valve, and is connected with the municipal water supply system to continuously supplement the water source of the system. The exhaust device adopts a combination of a differential pressure bypass valve and an expansion tank to stabilize the system pressure, buffer the pressure fluctuation and ensure the stable operation of the system.

[0015] The working method of the lake water natural cold source coupled heat pump cooling and heating system comprises a lake water natural cold source air conditioning system cooling mode, a lake water natural cold source and water source heat pump combined cooling mode, a water source heat pump system cooling mode and a water source heat pump system heating mode.

[0016] The lake water natural cold source air conditioning system cooling mode: when the lake water temperature is detected to be lower than 13 DEG C, the first valve is opened, the low-temperature lake water filtered through dust is made to enter the plate heat exchanger through the first water supply pipeline under the action of the first water pump to exchange heat with the system water medium, the fourth valve is opened, and the lake water medium after heat exchange returns to the lake water source through the first return water pipeline; the second valve and the fifteenth valve are opened, the water medium after cooling in the plate heat exchanger enters the second water supply pipeline to supply cooling to the user side, and the third valve is opened, and the water medium after cooling at the user end returns to the plate heat exchanger through the second return water pipeline.

[0017] The lake water natural cold source and heat pump combined cooling mode: when the lake water temperature is detected to be 13 DEG C to 16 DEG C, the double cold source combined cooling is started, the first valve is opened, the low-temperature lake water filtered through dust is made to enter the plate heat exchanger through the third water supply pipeline under the action of the first water pump to precool the system water medium, the seventh valve, the fourteenth valve, the sixth valve and the fifteenth valve are opened, the lake water medium returns to the lake water source through the third return water pipeline and is exchanged again through the water source side heat exchanger; the water medium after precooling in the plate heat exchanger is made to enter the fourth water supply pipeline through the second valve, the ninth valve and the eleventh valve, is cooled again through the user side heat exchanger through the fourth return water pipeline, and then supplies cooling to the user end, and the third valve is opened, and the water medium after heat exchange returns to the plate heat exchanger through the fourth return water pipeline.

[0018] The water source heat pump system cooling mode: when the lake water temperature is detected to be higher than 16 DEG C, the heat pump cooling mode is started, the fifth valve and the eighth valve are opened, the low-temperature lake water filtered through dust is made to enter the water source side heat exchanger under the action of the first water pump; the twelfth valve is opened, and the lake water medium after heat exchange returns to the lake water source; under the action of the throttling valve, reverse circulation is realized between the water source side heat exchanger and the user side heat exchanger, the medium in the user side heat exchanger enters the water source side heat exchanger under the action of the compressor, and returns to the user side heat exchanger through the throttling valve; the sixteenth valve is opened, the water medium after cooling in the user side heat exchanger supplies cooling to the user end through the sixth water supply pipeline, and the tenth valve, the fifteenth valve and the sixteenth valve are opened, and the water medium returns to the user side heat exchanger through the sixth return water pipeline under the action of the second water pump.

[0019] The water source heat pump system heating mode: open the fifth valve and the eighth valve, the dust filtered lake water medium enters the water source side heat exchanger under the action of the first water pump, open the twelfth valve, the heat exchanged lake water medium returns to the lake water source, the medium in the water source side heat exchanger enters the user side heat exchanger under the action of the compressor and then returns to the water source side heat exchanger through the throttling valve, the water medium after heat exchange in the user side heat exchanger supplies heat to the user end through the sixth water supply pipeline, and the heat exchanged water medium returns to the user side heat exchanger through the sixth water return pipeline.

[0020] The utility model has the advantages that:

[0021] 1. The lake water natural cold source cold quantity is directly supplied to the user end through the plate heat exchanger, and multiple cooling and heating modes are formed in combination with the water source heat pump unit, so that flexible switching and combined operation of the natural cold source and mechanical refrigeration are realized. Compared with the single compressor refrigeration mode of the traditional mechanical refrigeration system, the utility model effectively solves the problem of high energy consumption of the air conditioning system and significantly reduces the system operation cost.

[0022] 2. The lake water natural cold source air conditioning system is refrigerated by lake water alone, the natural low-temperature cold water is directly sent to the water supply main pipe for the user side to be cooled and dehumidified after the medium is cooled by the plate heat exchanger, and the efficient utilization of the natural cold source can realize the reduction of the energy consumption and operation cost of the system.

[0023] 3. The lake water natural cold source and the heat pump coupled system are used for cooling, so that the natural cold source is fully utilized, the heat and humidity load demand of the user side can be met in the case of insufficient or fluctuating free cold source, and the reliable operation of the lake water natural cold source and the heat pump coupled system for cooling is ensured.

[0024] 4. The water source heat pump system is used for cooling and heating alone, the lake water natural water body is used as the cold source or heat source of the heat pump system, the water body temperature is lower and more stable than the ambient air temperature, the efficient operation of the water source heat pump unit is ensured, and the sustainability of the system is ensured due to the renewability of the natural water source.

[0025] 5. The temperature sensor is designed, each valve can be flexibly controlled according to the temperature of the lake water natural water body and the user demand, the system can be switched to the corresponding working mode, the stability and reliability of the system are ensured, and the energy saving and consumption reduction of the system are realized. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is the total working principle diagram of the lake water natural cold source coupled heat pump cooling and heating system of the embodiment;

[0027] Figure 2 It is the working principle diagram of the lake water natural cold source air conditioning system in the cooling mode of the embodiment;

[0028] Figure 3 Fig. 1 is a working principle diagram of a lake water natural cold source and a heat pump combined cooling mode according to the present embodiment;

[0029] Figure 4 Fig. 2 is a working principle diagram of a water source heat pump system cooling mode according to the present embodiment;

[0030] Figure 5 Fig. 3 is a working principle diagram of a water source heat pump system heating mode according to the present embodiment.

[0031] Explanation of the drawing:

[0032] 1, lake water source; 2, first water pump; 3, first filter; 4, first flow meter; 5, first valve; 6, first temperature sensor; 7, first pressure gauge; 8, plate heat exchanger; 9, second valve; 10, third valve; 11, second pressure gauge; 12, second temperature sensor; 13, fourth valve; 14, fifth valve; 15, sixth valve; 16, seventh valve; 17, eighth valve; 18, ninth valve; 19, tenth valve; 20, eleventh valve; 21, twelfth valve; 22, thirteenth valve; 23, fourteenth valve; 24, electric three-way valve; 25, throttling valve; 26, first heat exchanger; 27, second heat exchanger; 28, compressor; 29, fifteenth valve; 30, radio frequency water treatment device; 31, sixteenth valve; 32, seventeenth valve; 33, differential pressure bypass valve; 34, third temperature sensor; 35, user end; 36, fourth temperature sensor; 37, second flow meter; 38, second water pump; 39, expansion tank; 40, water replenishment valve. DETAILED DESCRIPTION

[0033] The present application will be further described in detail below in combination with the drawings and specific embodiments.

[0034] Embodiment 1, as shown in Fig. 1, in the present embodiment, a lake water natural cold source coupled heat pump cooling and heating system, including with user end 35 form cooling circuit lake water natural cold source air conditioning system, with user end 35 form cooling circuit lake water natural cold source and water source heat pump combined system, with user end 35 form cooling and heating circuit water source heat pump system.

[0035] Embodiment 2, on the basis of further optimization of example 1, as shown in Figure 2, the lake water natural cold source air conditioning system includes lake water source 1, first water pump 2, first filter 3, first flowmeter 4, first temperature sensor 6, first pressure gauge 7, plate heat exchanger 8, second valve 9, fifteenth valve 29, third temperature sensor 34, user end 35, fourth temperature sensor 36, differential pressure bypass valve 33, second flowmeter 37, radio frequency water processor 30, third valve 10, second pressure gauge 11, second temperature sensor 12, fourth valve 13, second water pump 38, expansion tank 39 and water replenishment valve 40.

[0036] In this embodiment, the plate heat exchanger 8 is connected with the lake water source 1 through the first water supply pipeline and the first return water pipeline. Among them, the first water pump 2, the first filter 3, the first flowmeter 4, the first temperature sensor 6 and the first pressure gauge 7 are sequentially arranged on the first water supply pipeline, and the second pressure gauge 11, the second temperature sensor 12 and the fourth valve 13 are sequentially arranged on the first return water pipeline; the plate heat exchanger 8 is connected with the user end 35 through the second water supply pipeline and the second return water pipeline, the second valve 9, the fifteenth valve 29 and the third temperature sensor 34 are sequentially arranged on the second water supply pipeline, and the fourth temperature sensor 36, the second flowmeter 37 and the third valve 10 are sequentially arranged on the second return water pipeline. The differential pressure bypass valve 33 is arranged near the user end 35 to connect the second water supply pipeline and the second return water pipeline. The second return water pipeline is divided into two branches after passing through the second flowmeter 37, one branch is connected with the plate heat exchanger 8, and the other branch is used as a municipal water replenishment pipeline, and the second water pump 38, the expansion tank 39 and the water replenishment valve 40 are sequentially arranged on the municipal water replenishment pipeline.

[0037] Embodiment 3, based on embodiment 1, as shown in FIG. 3, the lake water natural cold source and water source heat pump combined system comprises a lake water source 1, a first water pump 2, a first filter 3, a first flow meter 4, a first temperature sensor 6, a first pressure gauge 7, a plate heat exchanger 8, a second valve 9, a fifteenth valve 29, a third temperature sensor 34, a user end 35, a fourth temperature sensor 36, a differential pressure bypass valve 33, a second flow meter 37, a radio frequency water processor 30, a third valve 10, a second pressure gauge 11, a second temperature sensor 12, a fourth valve 13, a second water pump 38, an expansion tank 39, a water supplement valve 40, a ninth valve 18, an eleventh valve 20, a second heat exchanger 27, a first heat exchanger 26, a compressor 28, a throttling valve 25, a fourteenth valve 23, a sixth valve 15 and an electric three-way valve 24. Among them, the water source heat pump unit is composed of the second heat exchanger 27, the first heat exchanger 26, the compressor 28 and the throttling valve 25, and the working medium in the first heat exchanger 26 and the second heat exchanger 27 is refrigerant.

[0038] The pipeline connection of the system is as follows: the lake water source 1, the plate heat exchanger 8 and the heat pump unit are connected through the third water supply pipeline and the third water return pipeline. The first water pump 2, the first filter 3, the first flow meter 4, the first temperature sensor 6, the first pressure gauge 7, the plate heat exchanger 8, the second valve 9, the ninth valve 18 and the second heat exchanger 27 are sequentially arranged on the third water supply pipeline, the third water supply pipeline and the third water return pipeline are connected through the compressor 28 and the throttling valve 25, and the first heat exchanger 26, the fourteenth valve 23, the sixth valve 15 and the fifteenth valve 29 are sequentially arranged on the third water return pipeline. The plate heat exchanger 8, the heat pump unit and the user end 35 are connected through the fourth water supply pipeline and the fourth water return pipeline, the second pressure gauge 11, the second temperature sensor 12, the seventh valve 16, the electric three-way valve 24, the heat pump unit, the eleventh valve 20 and the third temperature sensor 34 are sequentially arranged on the fourth water supply pipeline, and the second flow meter 37, the radio frequency water processor 30 and the third valve 10 are sequentially arranged on the fourth water return pipeline. The fourth water return pipeline is divided into two branches after passing through the second flow meter 37, one branch is connected to the plate heat exchanger 8, and the other branch is used as a municipal water supplement pipeline, and the second water pump 38, the expansion tank 39 and the water supplement valve 40 are sequentially arranged on the municipal water supplement pipeline.

[0039] Embodiment 4: Based on Embodiment 1, as shown in FIG. 4 and FIG. 5, the water source heat pump system comprises a lake water source 1, a first water pump 2, a first filter 3, a first flow meter 4, a fifth valve 14, an eighth valve 17, a second heat exchanger 27, a first heat exchanger 26, a compressor 28, a throttling valve 25, a sixteenth valve 31, a seventeenth valve 32, a tenth valve 19, a fifteenth valve 29, a radio frequency water processor 30, a second water pump 38, an expansion tank 39, a water replenishment valve 40, a second flow meter 37, a differential pressure bypass valve 33, a third temperature sensor 34, a user end 35, and a fourth temperature sensor 36. Among them, the water source heat pump unit is composed of the second heat exchanger 27, the compressor 28, the first heat exchanger 26 and the throttling valve 25, and the working medium in the first heat exchanger 26 and the second heat exchanger 27 is refrigerant.

[0040] The pipeline connection of the system is as follows: the second heat exchanger 27 and the lake water source 1 are connected through the fifth water supply pipeline and the fifth water return pipeline. The first water pump 2, the first filter 3, the first flow meter 4, the fifth valve 14 and the eighth valve 17 are sequentially arranged on the fifth water supply pipeline. After being filtered, the lake water enters the second heat exchanger 27 through the fifth water supply pipeline for heat exchange, and after heat exchange, it returns to the lake water source 1 through the fifth water return pipeline (provided with a twelfth valve 21) under the action of the first water pump 2. In the water source heat pump unit, the refrigerant in the second heat exchanger 27 is heated and becomes high-temperature and high-pressure state under the action of the compressor 28, and then enters the first heat exchanger 26 through the throttling valve 25, and after pressure reduction through the throttling valve 25, it returns to the second heat exchanger 27 in a low-temperature and low-pressure state.

[0041] The first heat exchanger 26 and the user end 35 are connected through the sixth water supply pipeline and the sixth water return pipeline. The seventeenth valve 32 and the third temperature sensor 34 are sequentially arranged on the sixth water supply pipeline, and the fourth temperature sensor 36, the second flow meter 37 and the radio frequency water processor 30 are sequentially arranged on the sixth water return pipeline. In the water source heat pump unit single cooling condition, the sixth water return pipeline is divided into two branches after passing through the radio frequency water processor 30: the first branch is provided with the sixteenth valve 31; the second branch is sequentially provided with the tenth valve 19 and the fifteenth valve 29, and is connected with the sixth water supply pipeline at the seventeenth valve 32, so that part of the return water is mixed with the water supply and sent to the user end 35.

[0042] In the above embodiment, the first water pump 2 is used to provide water flow for the flow of lake water or water medium; the first filter 3 is used to filter impurities in the lake water, including solid particles such as silt and suspended matter; and the first flow meter 4 is used to monitor water flow.

[0043] A working method of a lake water natural cold source coupled heat pump cooling and heating system includes the following four working modes: lake water natural cold source air conditioning system cooling mode, lake water natural cold source and water source heat pump combined cooling mode, water source heat pump system cooling mode and water source heat pump system heating mode. The specific working processes of each mode are as follows:

[0044] Lake water natural cold source air conditioning system cooling mode:

[0045] Lake water side circulation: open the first valve 5, the low-temperature lake water is filtered by the first filter 3, then enters the plate heat exchanger 8 for heat exchange under the action of the first water pump 2 through the first water supply pipeline, and the heat-exchanged lake water returns to the lake water source 1 through the first return water pipeline (the fourth valve 13 is opened).

[0046] User side circulation: open the second valve 9 and the fifteenth valve 29, the cooled water in the plate heat exchanger 8 is transported to the user end 35 for cooling through the second water supply pipeline, and the heat-exchanged water returns to the plate heat exchanger 8 through the second return water pipeline (the third valve 10 is opened).

[0047] Lake water natural cold source and water source heat pump combined cooling mode:

[0048] Lake water side circulation: open the first valve 5, the low-temperature lake water is filtered, then enters the plate heat exchanger 8 for pre-cooling of water under the action of the first water pump 2 through the first water supply pipeline, and the pre-cooled lake water is heat-exchanged again by the first heat exchanger 26, then returns to the lake water source 1 through the third return water pipeline (the fourteenth valve 23, the sixth valve 15 and the fifteenth valve 29 are opened).

[0049] User side circulation: open the second valve 9 and the ninth valve 18, the water is further cooled by heat exchange with the low-temperature and low-pressure refrigerant in the second heat exchanger 27, then is supplied to the user end 35 for cooling through the fourth water supply pipeline, and the heat-exchanged water returns to the plate heat exchanger 8 through the fourth return water pipeline.

[0050] Water source heat pump system cooling mode:

[0051] Lake water side circulation: open the fifth valve 14, the filtered low-temperature lake water is heat-exchanged by the second heat exchanger 27 under the action of the first water pump 2 through the fifth water supply pipeline, then returns to the lake water source 1 through the sixth return water pipeline (the twelfth valve 21 is opened).

[0052] Heat pump cycle: under the action of compressor 28 and throttle valve 25, inverse circulation is formed between first heat exchanger 26 and second heat exchanger 27. The refrigerant is compressed into high-temperature and high-pressure state by compressor 28 after absorbing heat in first heat exchanger 26, and is discharged in second heat exchanger 27, and is throttled by throttle valve 25 and returns to first heat exchanger 26 in low-temperature and low-pressure state.

[0053] User side cycle: open seventeenth valve 32, tenth valve 19 and fifteenth valve 29, and the water after heat exchange is mixed with municipal water and enters user end 35 through sixth water supply pipeline to supply cold, and sixteenth valve 31 is opened, and mixed water returns to first heat exchanger 26 through sixth return water pipeline under the action of second water pump 38.

[0054] Water source heat pump heating mode:

[0055] Lake water side cycle: open fifth valve 14, and filtered lake water enters second heat exchanger 27 through fifth water supply pipeline under the action of first water pump 2 to exchange heat, and then returns to lake water source 1 through twelfth valve 21.

[0056] Heat pump cycle: the refrigerant in second heat exchanger 27 is compressed into high-temperature and high-pressure state by compressor 28 after heat exchange, enters first heat exchanger 26, is throttled by throttle valve 25, and returns to second heat exchanger 27 in low-temperature and low-pressure state.

[0057] User side cycle: open seventeenth valve 32, and the water after heat exchange in first heat exchanger 26 is transported to user end 35 through sixth water supply pipeline to supply heat, and sixteenth valve 31 is opened, and municipal water is mixed with the water after heat exchange under the action of second water pump 38, and then returns to first heat exchanger 26 through sixth return water pipeline.

[0058] The above shows and describes the basic principle, main features and advantages of the utility model creation. It should be understood by those skilled in the art that the utility model creation is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only to illustrate the principle of the utility model creation, and the utility model creation can also have various changes and improvements without departing from the spirit and scope of the utility model creation, and these changes and changes all fall within the scope of the utility model creation claimed.

Claims

1. A lake water natural cold source coupled heat pump cooling and heating system, characterized in that, The system comprises: a lake water source; a plate heat exchanger connected with the lake water source through a lake water supply and return pipeline; a water source heat pump unit comprising a first heat exchanger, a compressor, a second heat exchanger and a throttling valve connected in sequence to form a refrigerant circulation loop; a user end connected with the plate heat exchanger and the first heat exchanger through user supply and return pipelines; the lake water source is connected with the plate heat exchanger and the second heat exchanger to form a lake water circulation loop, and the plate heat exchanger is connected with the water source heat pump unit through the supply and return pipelines to form a heat pump circulation loop; the system realizes lake water natural cold source cooling, lake water natural cold source and heat pump combined cooling, and water source heat pump cooling and heating functions through the opening and closing control of multiple valves.

2. The lake water natural cold source coupled heat pump cooling and heating system according to claim 1, characterized in that, The supply and return pipelines between the lake water source and the plate heat exchanger comprise: a first water supply pipeline and a first water return pipeline; one end of the first water supply pipeline is connected with the lake water source, and the other end is connected with the plate heat exchanger, and a first water pump for providing water flow power, a first filter for filtering impurities in the lake water, a first flow meter for monitoring water flow, a first temperature sensor for detecting water temperature, and a first pressure gauge for monitoring pipeline pressure are sequentially arranged on the first water supply pipeline; one end of the first water return pipeline is connected with the plate heat exchanger, and the other end is connected with the lake water source, and a second pressure gauge, a second temperature sensor and a fourth valve are sequentially arranged on the first water return pipeline.

3. The lake water natural cold source coupled heat pump cooling and heating system according to claim 1, characterized in that, The supply and return pipelines between the plate heat exchanger and the user end comprise: a second water supply pipeline and a second water return pipeline; one end of the second water supply pipeline is connected with the plate heat exchanger, and the other end is connected with the user end, and a second valve, a fifteenth valve and a third temperature sensor are sequentially arranged on the second water supply pipeline; one end of the second water return pipeline is connected with the user end, and the other end is connected with the plate heat exchanger, and a fourth temperature sensor, a second flow meter and a third valve are sequentially arranged on the second water return pipeline; a differential pressure bypass valve is arranged at the user end to connect the second water supply pipeline and the second water return pipeline.

4. The lake water natural cold source coupled heat pump cooling and heating system according to claim 1, characterized in that, The supply and return pipelines between the lake water source, the plate heat exchanger and the water source heat pump unit comprise: a third water supply pipeline and a third water return pipeline; one end of the third water supply pipeline is connected with the plate heat exchanger, and the other end is connected with the first heat exchanger through the second heat exchanger, and a first water pump for providing water flow power, a first filter for filtering lake water, a first flow meter for monitoring flow, a first temperature sensor for detecting water temperature, a first pressure gauge for monitoring pressure, a second valve for controlling the flow of lake water into the second heat exchanger, and a ninth valve for switching the lake water circulation loop are sequentially arranged on the third water supply pipeline; one end of the third water return pipeline is connected with the first heat exchanger, and the other end is connected with the lake water source, and a fourteenth valve, a sixth valve and a fifteenth valve are sequentially arranged on the third water return pipeline for returning lake water and realizing switching control.

5. The lake water natural cold source coupled heat pump cooling and heating system according to claim 1, characterized in that, The supply and return pipelines between the plate heat exchanger, the water source heat pump unit and the user end comprise: a fourth water supply pipeline and a fourth water return pipeline; one end of the fourth water supply pipeline is connected with the plate heat exchanger, and the other end is connected with the user end, and a second pressure gauge, a second temperature sensor, a seventh valve, an electric three-way valve, an eleventh valve and a third temperature sensor are sequentially arranged on the fourth water supply pipeline; one end of the fourth water return pipeline is connected with the user end, and the other end is connected with the plate heat exchanger, and a second flow meter and a third valve are sequentially arranged on the fourth water return pipeline.

6. The lake water natural cold source coupled heat pump cooling and heating system according to claim 1, characterized in that, The water supply and return pipeline between the lake water source and the second heat exchanger comprises: a fifth water supply pipeline and a fifth water return pipeline; one end of the fifth water supply pipeline is connected to the lake water source, and the other end is connected to the second heat exchanger, and a first water pump, a first filter, a first flow meter, a fifth valve and an eighth valve are sequentially arranged on the fifth water supply pipeline; one end of the fifth water return pipeline is connected to the second heat exchanger, and the other end is connected to the lake water source, and a twelfth valve is arranged on the fifth water return pipeline.

7. The lake water natural cold source coupled heat pump cooling and heating system according to claim 1, characterized in that, The water supply and return pipeline between the first heat exchanger and the user end comprises: a sixth water supply pipeline and a sixth water return pipeline; one end of the sixth water supply pipeline is connected to the first heat exchanger, and the other end is connected to the user end, and a seventeenth valve and a third temperature sensor are sequentially arranged on the sixth water supply pipeline; one end of the sixth water return pipeline is connected to the user end, and the other end is connected to the first heat exchanger and the municipal water supplement pipeline respectively, and a fourth temperature sensor, a second flow meter and a radio frequency water treatment device are sequentially arranged on the sixth water return pipeline.

8. The lake water natural cold source coupled heat pump cooling and heating system according to claim 7, characterized in that, The municipal water supplement pipeline comprises: a first branch, on which a sixteenth valve is arranged; a second branch, on which a tenth valve and a fifteenth valve are sequentially arranged; a second water pump, an expansion tank and a water supplement valve are further arranged on the municipal water supplement pipeline.

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