CN211502953U - Hot water combined supply system for low-grade multi-heat source combined application - Google Patents

Abstract

The utility model discloses a combined application of low-grade hot water with multiple heat sources, comprising a refrigerant circulation unit, a hot water unit and a waste heat unit; the refrigerant circulation unit communicates with the hot water unit through a plate heat exchanger connected, the waste heat unit is connected to the refrigerant circulation unit through a dual-channel heat exchanger. The evaporator of the refrigerant cycle unit of the utility model adopts a double-channel heat exchanger, and while making full use of the solar energy, the heat recovered by the waste heat recovery device is transferred to the double-channel heat exchanger through the waste heat pump to act as the main low-level heat source of the refrigerant cycle unit, which overcomes the It solves the frosting problem of the evaporator of the air source heat pump, makes reasonable use of low-grade energy, and complements the advantages of solar energy, waste heat of the data center and air energy, and greatly improves the energy efficiency of the system while ensuring the stable supply of hot water to the system.

Description

Combined application of hot water supply system with low-grade and multiple heat sources

technical field

The utility model relates to the technical field of heat pumps, in particular to a combined application of a low-grade and multi-heat source combined hot water supply system.

Background technique

Air source heat pumps have the advantages of energy saving, environmental protection, reliable performance, etc., and are gradually widely used in building heating and domestic hot water supply. However, under outdoor low temperature conditions, air source heat pumps have obvious energy efficiency attenuation and serious frosting problems, which are difficult to meet stably. heating demand.

Solar energy is inexhaustible and inexhaustible, and is one of the most environmentally friendly energy sources. However, solar energy is a discontinuous and unstable energy source, and its use alone has certain limitations. Other heat sources are still needed for auxiliary heating to meet all-weather heating and hot water supply.

The data center has high energy consumption, large waste heat, and is close to commercial and residential areas. Therefore, the data center is an excellent waste heat source. Moreover, with the promotion and application of liquid-cooled data centers, the quality of data center waste heat is expected to further improve. It is necessary to efficiently utilize the waste heat of the data center.

There is a certain complementarity between the peaks and valleys of the heating capacity of solar energy and the waste heat of the data center. The air energy fluctuation is small but the quality is low. The heat pump technology that uses a combination of various heat sources can make up for the shortcomings of each technology and achieve stable heat supply.

Utility model content

In order to overcome the above-mentioned deficiencies of the prior art, the present utility model provides a combined application of low-grade and multiple heat sources for a combined hot water supply system, which rationally utilizes low-grade energy and complements the advantages of solar energy, data center waste heat and air energy. While supplying hot water stably, the energy efficiency of the system is greatly improved.

For achieving the above object, the technical scheme of the present utility model is:

A combined application of low-grade and multi-heat source combined hot water system includes a refrigerant circulation unit, a hot water unit and a waste heat unit; the refrigerant circulation unit is connected to the hot water unit through a plate heat exchanger, and the waste heat unit is connected to the hot water unit through a plate heat exchanger. A dual-channel heat exchanger is connected to the refrigerant circulation unit.

Preferably, the refrigerant circulation unit includes a compressor, a plate heat exchanger, a throttling device and a dual-channel heat exchanger; the hot water unit includes a hot water storage tank, a first hot water pump, a plate heat exchanger, a second a solenoid valve, a second solenoid valve, a solar collector, a second hot water pump and a make-up water pump; the waste heat unit includes a waste heat recovery device, a waste heat water pump and a dual-channel heat exchanger.

Preferably, the outlet of the compressor is connected to a plate heat exchanger, the plate heat exchanger is connected to a throttling device, the throttling device is connected to a dual-channel heat exchanger, and the dual-channel heat exchanger is connected to the inlet of the compressor connected to form a refrigerant circulation unit; the hot water storage tank is connected to a first hot water pump, the first hot water pump is connected to a plate heat exchanger, the plate heat exchanger is connected to a first solenoid valve, and the first electromagnetic The valve is connected with the second solenoid valve, the second hot water pump and the make-up water pump, the second solenoid valve is connected with the hot water storage tank, the second hot water pump is connected with the solar heat collector, and the solar heat collector is connected with the hot water storage tank The waste heat recovery device is connected with the waste heat water pump, the waste heat water pump is connected with the dual-channel heat exchanger, and the dual-channel heat exchanger is connected with the waste heat recovery device to form the waste heat unit.

Preferably, the adjacent channels of the plate heat exchanger respectively flow through refrigerant and water, and the water flow direction is opposite to the refrigerant flow direction; the throttling device is an electronic expansion valve, a thermal expansion valve or a capillary; the dual-channel heat exchanger The heater is mainly composed of a refrigerant channel, a waste heat defrosting channel and fins. The refrigerant channel and the waste heat defrosting channel are all connected by copper tubes. The fins parallel to the cross-sectional direction of the copper tube are arranged on the copper tube. The refrigerant channel The refrigerant and water flow through the waste heat defrosting channel respectively, and the water flow direction is opposite to the refrigerant flow direction.

Preferably, the solar heat collector is a vacuum tube solar heat collector with double glass and intermediate vacuum insulation, and the heat absorbed by the glass tube is not transmitted to the outside, but only to the water in the glass tube.

Compared with the prior art, the beneficial effects of the present utility model are:

1. The heat recovered by the waste heat recovery device is transferred to the dual-channel heat exchanger through the waste heat pump to act as the main low-level heat source of the refrigerant circulation unit, realizing the recovery and reuse of the waste heat of the data center.

2. The evaporator of the refrigerant cycle unit adopts a dual-channel heat exchanger. In the dual-source heating mode and the triple-source heating mode, the heat recovered by the waste heat recovery device is transferred to the dual-channel heat exchanger through the waste heat pump to act as a refrigerant cycle unit. The main low-level heat source completely overcomes the frosting problem of the air source heat pump evaporator.

3. Use the solar collector to heat up the water once, and the medium-temperature water after the temperature rise is transported to the hot water storage tank through the second hot water pump, and the medium-temperature water after the one-time temperature rise is heated again through the refrigerant circulation unit and the waste heat unit. , the hot water after the second heating is transported to the hot water storage tank through the first hot water pump, so as to fully utilize the low-grade solar energy.

Description of drawings

1 is a schematic diagram of a combined hot water supply system according to an embodiment of the present invention;

2 is a valve switching diagram of three operating modes of the combined hot water supply system according to the embodiment of the present invention;

Description of reference numerals: 1-compressor; 2-plate heat exchanger; 3-throttle device; 4-double-channel heat exchanger; 5-hot water storage tank; 6-first hot water pump; 7-first electromagnetic valve; 8-second solenoid valve; 9-solar heat collector; 10-second hot water pump; 11-supplementary water pump; 12-waste heat recovery device; 13-waste heat pump.

Detailed ways

In order to make the above objects, features and advantages of the present utility model more clearly understood, the present utility model will be described in further detail below with reference to the accompanying drawings and specific embodiments.

As shown in FIG. 1 , the combined application of low-grade and multi-heat source combined hot water system in this embodiment includes a refrigerant circulation unit, a hot water unit, a waste heat unit, and a matching control module.

The refrigerant circulation unit is connected with the hot water unit through the plate heat exchanger 2 , and the waste heat unit is connected with the refrigerant circulation unit through the double-channel heat exchanger 4 .

The refrigerant cycle unit includes a compressor 1 , a plate heat exchanger 2 , a throttling device 3 and a dual-channel heat exchanger 4 . The outlet of the compressor 1 is connected with the plate heat exchanger 2, the plate heat exchanger 2 is connected with the throttling device 3, the throttling device 3 is connected with the double-channel heat exchanger 4, and the double-channel heat exchanger 4 is connected with the compressor 1 is connected to the inlet.

The hot water unit includes a hot water storage tank 5 , a first hot water pump 6 , a plate heat exchanger 2 , a first solenoid valve 7 , a second solenoid valve 8 , a solar collector 9 , a second hot water pump 10 and a make-up water pump 11 . The hot water storage tank 5 is connected with the first hot water pump 6, the first hot water pump 6 is connected with the plate heat exchanger 2, the plate heat exchanger 2 is connected with the first solenoid valve 7, and the first solenoid valve 7 is connected with the second The solenoid valve 8, the second hot water pump 10 and the make-up water pump 11 are connected, the second solenoid valve 8 is connected with the hot water storage tank 5, the second hot water pump 10 is connected with the solar heat collector 9, and the solar heat collector 9 is connected with The hot water storage tank 5 is connected.

The waste heat unit includes a waste heat recovery device 12 , a waste heat water pump 13 and a dual-channel heat exchanger 4 . The waste heat recovery device 12 is connected with the waste heat water pump 13 , and the waste heat water pump 13 is connected with the dual-channel heat exchanger 4 . The waste heat recovery device 12 is used to recover the waste heat of the data center.

Adjacent channels of the plate heat exchanger 2 flow through refrigerant and water respectively, and the water flow direction is opposite to the refrigerant flow direction. The throttling device 3 is an electronic expansion valve, may also be a thermal expansion valve, or may be a capillary tube. The dual-channel heat exchanger 4 is mainly composed of a refrigerant channel, a waste heat defrosting channel and fins. The refrigerant channel and the waste heat defrosting channel are both connected by copper tubes, and fins parallel to the cross-sectional direction of the copper tubes are arranged on the copper tubes. , the refrigerant channel and the residual heat defrosting channel respectively flow through the refrigerant and water, and the water flow direction is opposite to the refrigerant flow direction.

The solar collector 9 is a vacuum tube solar collector 9 with double-layer glass and intermediate vacuum insulation. The heat absorbed by the glass tube is not transmitted to the outside, but only to the water in the glass tube.

The evaporator of the refrigerant cycle unit adopts a dual-channel heat exchanger 4, and while making full use of solar energy, the heat recovered by the waste heat recovery device 12 is transferred to the dual-channel heat exchanger 4 through the waste heat pump 13 to serve as the main low-level heat source of the refrigerant cycle unit. Completely overcome the air source heat pump evaporator frost problem.

As shown in FIG. 2 , in the combined application of low-grade and multi-heat sources, three operating modes of solar independent heating, dual-source heating and triple-source heating can be obtained by switching the solenoid valve and the water pump.

When the solar radiation intensity is high (solar radiation meets independent heating), the hot water unit is turned on, and the system operates the solar independent heating mode. In the solar independent heating mode, close the first solenoid valve 7, the first hot water pump 6 and the waste heat water pump 13, and open the second solenoid valve 8, the second hot water pump 10 and the make-up water pump 11, the solar heat collector 9 absorbs heat The water is heated up, and the heated hot water is sent to the hot water storage tank 5 through the second hot water pump 10 , thus completing the solar energy independent heating.

When there is no light, turn on the refrigerant circulation unit, the waste heat unit and the hot water unit, and the system operates in the dual-source heating mode. In the dual-source heating mode, the first solenoid valve 7 , the second solenoid valve 8 , the first hot water pump 6 , the waste heat water pump 13 and the make-up water pump 11 are turned on, and the second hot water pump 10 is turned off. The recovered heat is sent to the waste heat defrosting channel of the dual-channel heat exchanger 4, and the refrigerant in the refrigerant channel of the dual-channel heat exchanger 4 absorbs heat and vaporizes, and the vaporized refrigerant gas is compressed by the compressor 1 and returned to the plate type. Heat exchanger 2, the high temperature and high pressure refrigerant in the plate heat exchanger 2 exchanges heat with the water to be heated in the hot water unit, and the heated hot water is transported to the hot water storage tank 5 through the first hot water pump 6 Among them, the dual-source heating is thus completed.

When the solar radiation cannot independently meet the heating demand, the refrigerant circulation unit, the waste heat unit and the hot water unit are turned on, and the system operates in the three-source heating mode. In the three-source heating mode, the first solenoid valve 7 and the second solenoid valve 8 are turned on, the first hot water pump 6, the second hot water pump 10, the waste heat water pump 13 and the make-up water pump 11 are turned on, and the solar heat collector 9 heats the water. Once the temperature is raised, the medium-temperature water after the temperature rise is transported to the hot water storage tank 5 through the second hot water pump 10, and the medium-temperature water after the first temperature rise is heated twice with the waste heat unit through the refrigerant circulation unit (the principle is the same as that of dual-source heating). mode), the hot water after the second heating is transported to the hot water storage tank 5 through the first hot water pump 6, thus completing the three-source heating.

The above-mentioned embodiments are only to illustrate the technical concept and characteristics of the present invention, and its purpose is to enable those of ordinary skill in the art to understand the content of the present invention and implement it accordingly, and cannot limit the protection scope of the present invention with this. . All equivalent changes or modifications made according to the essence of the content of the present invention should be covered within the protection scope of the present invention.

Claims (5)

1. The combined hot water supply system for the low-grade multi-heat source combined application is characterized in that: the system comprises a refrigerant circulating unit, a hot water unit and a waste heat unit; the refrigerant circulating unit is connected with the hot water unit through a plate heat exchanger, and the waste heat unit is connected with the refrigerant circulating unit through a double-channel heat exchanger.

2. The combined hot water supply system according to claim 1, wherein: the refrigerant circulating unit comprises a compressor, a plate type heat exchanger, a throttling device and a double-channel heat exchanger; the hot water unit comprises a heat storage water tank, a first hot water pump, a plate heat exchanger, a first electromagnetic valve, a second electromagnetic valve, a solar heat collector, a second hot water pump and a water replenishing pump; the waste heat unit comprises a waste heat recovery device, a waste heat water pump and a double-channel heat exchanger.

3. The combined hot water supply system according to claim 2, wherein: the outlet of the compressor is connected with the plate heat exchanger, the plate heat exchanger is connected with the throttling device, the throttling device is connected with the double-channel heat exchanger, and the double-channel heat exchanger is connected with the inlet of the compressor to form a refrigerant circulating unit; the solar water heater comprises a heat storage water tank, a plate heat exchanger, a first electromagnetic valve, a second hot water pump, a water replenishing pump, a solar heat collector and a water replenishing pump, wherein the heat storage water tank is connected with the first hot water pump; the waste heat recovery device is connected with the waste heat water pump, the waste heat water pump is connected with the double-channel heat exchanger, and the double-channel heat exchanger is connected with the waste heat recovery device to form a waste heat unit.

4. The combined hot water supply system according to claim 2, wherein: the adjacent channels of the plate heat exchanger respectively flow through the refrigerant and water, and the flow direction of the water is opposite to that of the refrigerant; the throttling device is an electronic expansion valve, a thermal expansion valve or a capillary tube; the dual-channel heat exchanger mainly comprises a refrigerant channel, a waste heat defrosting channel and fins, wherein the refrigerant channel and the waste heat defrosting channel are formed by connecting copper pipes, the fins parallel to the cross section direction of the copper pipes are arranged on the copper pipes, the refrigerant channel and the waste heat defrosting channel respectively flow through a refrigerant and water, and the flow direction of the water is opposite to that of the refrigerant.

5. The combined hot water supply system according to claim 2, wherein: the solar heat collector is a vacuum tube solar heat collector with double-layer glass and vacuum heat insulation in the middle, and heat absorbed by the glass tube is not transferred outwards but only transferred to water in the glass tube.

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