Heat recovery device and air conditioner with same

Abstract

The utility model discloses a heat recovery device and an air conditioner with the heat recovery device, and aims to solve the technical problem that heat redundancy generated by a fin type heat exchanger is wasted when a triple co-generation heat pump refrigerates in summer in the prior art, and the heat redundancy generated by the fin type heat exchanger is recovered for heating domestic water. Therefore, the operation energy consumption of the whole heat pump is reduced, and the purposes of energy conservation and environmental protection are achieved. The utility model further provides an air conditioner with the heat recovery device, the air conditioner comprises a heat pump system and the heat recovery device, the heat recovery device is used for recycling heat redundancy generated in the refrigeration process of the fin type heat exchanger, domestic water is heated to a certain temperature, and the heat recovery device is used for recycling the heat redundancy generated in the refrigeration process of the fin type heat exchanger. Therefore, the condensation temperature required by the heat pump system for making hot water is reduced, so that the operation energy consumption of the compressor is reduced, and the effect of reducing the operation energy consumption of the whole machine is finally achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioning heat exchange, in particular to a heat recovery device and an air conditioner with the heat recovery device. Background Art

[0002] A trigeneration heat pump is a heat pump unit that can provide three functions: air conditioning, floor heating, and hot water. When operating in summer, a trigeneration heat pump must meet both the cooling demand and the domestic hot water heating function. The condensing temperature required for cooling is different from the condensing temperature required for hot water, and the energy consumption required is also different. Generally speaking, the condensing temperature required for cooling is lower than the condensing temperature required for hot water, and the temperature difference between them requires increasing the energy consumption of the compressor to achieve. Most of the heat generated by the fin heat exchanger during cooling is used to evaporate the refrigerant in the evaporator into gas, and its redundant heat is often discharged into the environment and cannot be recycled, resulting in heat waste, making the operating energy consumption of the whole machine higher.

[0003] It can be seen that the existing technology still needs to be improved and enhanced. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the utility model is to provide a heat recovery device and an air conditioner with a heat recovery device, aiming to solve the technical problem in the prior art that the redundant heat generated by the fin heat exchanger of the trigeneration heat pump is wasted during summer cooling. By recovering the redundant heat generated by the fin heat exchanger for heating domestic water, the operating energy consumption of the heat pump unit is reduced, thereby achieving the purpose of energy saving and environmental protection.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A heat recovery device includes a surface cooling heat exchanger, a first water pump and a water tank. The surface cooling heat exchanger is used to absorb the heat generated by the fin heat exchanger of the air conditioner and use it to heat the water in the water tank. The first water pump is used to supply the water in the water tank to the surface cooling heat exchanger. The water tank is used to store domestic water.

[0007] The heat recovery device, wherein the surface cooling heat exchanger is arranged on a side of the fin heat exchanger close to the fan, and is located between the fan and the fin heat exchanger.

[0008] The heat recovery device is characterized in that a first water exchange pipe is arranged inside the surface cooling heat exchanger, the input end of the first water exchange pipe is connected to the output end of the first water pump, the output end of the first water exchange pipe is connected to the hot water input end of the water tank, and the cold water output end of the water tank is connected to the input end of the first water pump.

[0009] An air conditioner with a heat recovery device comprises a heat pump system and the above-mentioned heat recovery device. The heat pump system comprises a fin heat exchanger. The heat generated by the fin heat exchanger is absorbed by a surface cooling heat exchanger of the heat recovery device.

[0010] The air conditioner with a heat recovery device, wherein the heat pump system also includes a plate heat exchanger, a fan and a compressor, the compressor is connected to the fin heat exchanger and the plate heat exchanger respectively via a four-way valve, the fin heat exchanger is connected to the plate heat exchanger via an expansion valve, and the fan is arranged on one side of the fin heat exchanger and is used to form an airflow from the air cooled by the fin heat exchanger and blow it into the application environment.

[0011] The air conditioner with a heat recovery device, wherein the heat pump system also includes a second water pump; a second water pipe is also arranged inside the plate heat exchanger, the input end of the second water pump is connected to a water tank, the output end of the second water pump is connected to the input end of the second water pipe, and the output end of the second water pipe is connected to the water tank.

[0012] The air conditioner with a heat recovery device is characterized in that a heater is also provided in the water tank, and the heater is used to heat the domestic water in the water tank.

[0013] Beneficial effects:

[0014] The utility model provides a heat recovery device, which includes a surface cooling heat exchanger, a first water pump and a water tank which are interconnected to form a circulation loop. The surface cooling heat exchanger is used to absorb the redundant heat generated by the fin heat exchanger of the air conditioner and transfer it to the water flow in the first water pipe, so as to heat the domestic water in the water tank. The heat recovery device can realize the recovery and reuse of the redundant heat generated by the fin heat exchanger of the air conditioner during cooling, thereby achieving the advantages of energy saving and environmental protection.

[0015] The utility model also provides an air conditioner with a heat recovery device, the air conditioner includes a heat pump system and the heat recovery device, the heat pump system refrigerates and heats domestic hot water, during the refrigeration process, the redundant heat generated by the fin heat exchanger is recovered and reused by the heat recovery device, and the recovered heat is also used to heat domestic water. The heat recovery device is used to recycle the redundant heat generated by the fin heat exchanger during the refrigeration process, and the domestic water is heated to a certain temperature, so that the condensation temperature required for the heat pump system to make hot water is reduced, thereby reducing the operating energy consumption of the compressor, and finally achieving the effect of reducing the operating energy consumption of the whole machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The utility model provides a heat recovery device and an air conditioner with the heat recovery device.

[0017] Among them, 1-surface cooling heat exchanger; 2-first water pump; 3-water tank; 4-fin heat exchanger; 5-four-way valve; 6-compressor; 7-plate heat exchanger; 8-expansion valve; 9-second water pump; 10-fan. DETAILED DESCRIPTION

[0018] The utility model provides a heat recovery device and an air conditioner with a heat recovery device. In order to make the purpose, technical solution and effect of the utility model clearer and more specific, the utility model is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0019] In the description of the present utility model, it should be understood that the terms "upper", "lower", "left", "right", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, and a specific direction structure and operation, and therefore, cannot be understood as a limitation on the present utility model. In addition, "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0020] See also Figure 1 The utility model provides a heat recovery device, including a surface cooling heat exchanger 1, a first water pump 2 and a water tank 3. The surface cooling heat exchanger 1 is used to absorb the heat generated by the fin heat exchanger 4 of the air conditioner and heat the water in the water tank 3. The first water pump 2 is used to supply the water in the water tank 3 to the surface cooling heat exchanger 1. The water tank 3 is used to store domestic water. In this embodiment, the fin heat exchanger 4 refers to the heat exchanger of the indoor unit of the air conditioner, which is used as an evaporator in the refrigeration process; the first water pump 2 pumps the cold water in the water tank 3 into the water flow formed by the surface cooling heat exchanger 1 as a refrigerant, and the redundant heat generated by the fin heat exchanger 4 of the indoor unit of the air conditioner will be transmitted through the air or directly contacted with the outer wall of the heat exchanger and absorbed by the cold water flow in the surface cooling heat exchanger 1, so that the water flow is heated; the heated water flow flows back to the water tank 3 and is stored for use as domestic hot water or enters the next heating cycle.

[0021] Preferably, the water tank 3 can use an insulated water storage tank 3, and the water tank 3 is additionally provided with a water inlet for an external cold water source and a water outlet for an external water faucet. A hot and cold partition setting can be selected in the water tank 3 to divide cold water and hot water. The water inlet and the first water pump 2 are both connected to the cold water zone, and the water outlet and the surface cooling heat exchanger 1 are both connected to the water heater.

[0022] Furthermore, the surface cooling heat exchanger 1 is arranged on a side of the fin heat exchanger 4 close to the fan 10 and is located between the fan 10 and the fin heat exchanger 4. The fan 10 of the fin heat exchanger 4 is used to make the air cooled by the fin heat exchanger 4 become a fluid and be discharged into the external environment, and the surface cooling heat exchanger 1 is arranged between the fin heat exchanger 4 and the fan 10, which can further absorb the heat of the air fluid, thereby lowering the temperature of the air fluid and making the cooling effect of the air conditioner better.

[0023] Furthermore, a first hot water exchange pipe (not shown in the figure) is provided inside the surface cooling heat exchanger 1, the input end of the first hot water exchange pipe is connected to the output end of the first water pump 2, the output end of the first hot water exchange pipe is connected to the hot water input end of the water tank 3, and the cold water output end of the water tank 3 is connected to the input end of the first water pump 2. The first hot water exchange pipe and the first water pump 2, the first water pump 2 and the water tank 3, and the water tank 3 and the first hot water exchange pipe are all connected by water pipes to form a hot water circulation loop. The first water pump 2 pumps the cold water in the water tank 3 into the first hot water exchange pipe to form a water flow. The cold water flow in the first hot water exchange pipe absorbs the redundant heat generated by the fin heat exchanger 4 to become hot water, and then flows back to the water tank 3 for domestic hot water.

[0024] An air conditioner with a heat recovery device, the air conditioner includes a heat pump system and the above-mentioned heat recovery device, the heat pump system includes a fin heat exchanger 4, and the heat recovery device is used to recover the heat generated by the fin heat exchanger 4. In this embodiment, the air conditioner mainly refers to a trigeneration heat pump; the fin heat exchanger 4 is an indoor unit heat exchanger, and the fin heat exchanger 4 evaporates the refrigerant into a low-pressure and high-temperature gas during the cooling process of the air conditioner, and absorbs the heat of the ambient air in this process, thereby achieving the effect of heat exchange and cooling.

[0025] The air conditioner with heat recovery device, wherein the heat pump system further includes a plate heat exchanger 7, a fan 10 and a compressor 6, wherein the compressor 6 is connected to the fin heat exchanger 4 and the plate heat exchanger 7 respectively via a four-way valve, wherein the fin heat exchanger 4 is connected to the plate heat exchanger 7 via an expansion valve, and wherein the fan 10 is arranged on the side of the fin heat exchanger 4 close to the air outlet of the indoor unit and is used to form an airflow of the air cooled by the fin heat exchanger 4 and blow it into the application environment. In this embodiment, the application environment refers to the indoor room where air conditioning is required for cooling; the plate heat exchanger 7 is an outdoor unit heat exchanger, and the plate heat exchanger 7 is used as a condenser to release heat to the outside during the cooling process, and as an evaporator to absorb heat from the outside during the heating process. In the process of cooling and hot water production, the fan 10 also works, and the blowing direction of the fan 10 is away from the fin heat exchanger 4, so that the air cooled by the fin heat exchanger 4 and the surface cooling heat exchanger 1 is extracted and discharged into the application environment.

[0026] This embodiment is the same as the prior art, in which a refrigerant pipe and a water pipe that are close to each other and do not interfere with each other are arranged in the plate heat exchanger 7. When cooling and producing hot water, the high-temperature and high-pressure gaseous refrigerant compressed by the compressor 6 enters the refrigeration pipe and meets the low-temperature water flow in the water pipe, where it releases heat and condenses into liquid refrigerant, and the low-temperature water flow absorbs the heat released by the refrigerant and turns into hot water.

[0027] Furthermore, the four-way valve 5 has an a port, a b port, a c port and a d port, and a piston for switching the connection modes of the four ports. The two ends of the compressor are respectively connected to the a port and the c port, the b port is connected to the fin heat exchanger 4, and the plate heat exchanger 7 is connected to the d port.

[0028] During refrigeration, the a interface of the four-way valve 5 is connected to the d interface, and the b interface is connected to the c interface. The medium-temperature and high-pressure liquid refrigerant is converted into low-temperature and low-pressure wet steam through the expansion valve 8 and enters the fin heat exchanger 4 (evaporator); the fin heat exchanger 4 absorbs heat from the high-temperature air of the environment to evaporate the refrigerant into a low-pressure and high-temperature gas; the low-pressure and high-temperature gaseous refrigerant enters the four-way valve from the b interface, is discharged from the c interface, and enters the compressor 6 to be compressed into a high-temperature and high-pressure gaseous refrigerant; after the high-temperature and high-pressure gaseous refrigerant enters the four-way valve from the a interface, it is discharged from the d interface and enters the refrigerant pipeline of the plate heat exchanger 7 (condenser), and releases heat to the cold water in the water pipe to heat the water. The gaseous refrigerant condenses into a medium-temperature and high-pressure liquid refrigerant and flows back to the expansion valve 8 for the next cycle.

[0029] During heating, the a interface of the four-way valve 5 is connected to the b interface, and the d interface is connected to the c interface. The medium-temperature and high-pressure liquid refrigerant is converted into low-temperature and low-pressure wet steam through the expansion valve 8 and enters the plate heat exchanger 7 (evaporator); the plate heat exchanger 7 absorbs heat from the high-temperature air of the environment to evaporate the refrigerant into low-pressure and high-temperature gas; the low-pressure and high-temperature gaseous refrigerant enters the four-way valve from the d interface, and enters the compressor 6 after being discharged from the c interface to be compressed into a high-temperature and high-pressure gaseous refrigerant; the high-temperature and high-pressure gaseous refrigerant enters the four-way valve from the a interface, and enters the fin heat exchanger 4 (condenser) after being discharged from the b interface, and releases heat to the ambient air to form warm air. The gaseous refrigerant condenses into a medium-temperature and high-pressure liquid refrigerant and flows back to the expansion valve 8 for the next cycle. In this embodiment, the surface cooling heat exchanger 1 of the heat recovery device can also use the heat released by the fin heat exchanger 4 to heat the water in the water tank.

[0030] Furthermore, the heat pump system further includes a second water pump 9; a second water pipe (not shown in the figure) is further provided inside the plate heat exchanger 7, the input end of the second water pump 9 is connected to the water tank 3, the output end of the second water pump 9 is connected to the input end of the second water pipe, and the output end of the second water pipe is connected to the water tank 3. The second water pump 9, the second water pipe and the water tank 3 are the original hot water making circuit of the heat pump system. When the air conditioner is cooling and making hot water, the second water pump 9 pumps cold water into the second water pipe, and the low-temperature water flow in the second water pipe absorbs the heat of the refrigerant in the plate heat exchanger 7 to form a high-temperature water flow that flows into the water tank 3 as domestic hot water. In this embodiment, the original hot water making circuit of the heat pump system and the hot water making circulation circuit of the heat recovery device share a water tank 3. Under the same time and energy consumption conditions, the two hot water making circulation circuits can produce more domestic hot water, thereby achieving the effect of reducing the operating energy consumption of the whole air conditioner.

[0031] As a preferred embodiment, in the air conditioner with a heat recovery device, a heater is further provided in the water tank 3, and the heater is used to heat the domestic water in the water tank 3. The use of the heater to heat the hot water in the water tank 3 can effectively alleviate the shortage of hot water supply when the demand for domestic hot water is large, reduce the operating load of the compressor 6, and thus reduce energy consumption.

[0032] In summary, the utility model realizes the recycling of redundant heat generated by the fin heat exchanger 4 of the air conditioner during cooling through the heat recovery device, thereby achieving the advantages of energy saving and environmental protection. The redundant heat generated by the fin heat exchanger 4 during the cooling process is recycled by the heat recovery device, and the domestic water is heated to a certain temperature, so that the condensation temperature required for the heat pump system to make hot water is reduced, thereby reducing the operating energy consumption of the compressor 6, and finally achieving the effect of reducing the operating energy consumption of the whole machine.

[0033] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and utility model concept of the utility model, and all these changes or substitutions should fall within the protection scope of the claims attached to the utility model.

Claims

1. A heat recovery device, characterized in that: The invention comprises a surface cooling heat exchanger (1), a first water pump (2) and a water tank (3); the surface cooling heat exchanger (1) is used to absorb heat generated by a fin heat exchanger (4) of an air conditioner and to heat water in the water tank (3); the first water pump (2) is used to supply water in the water tank (3) to the surface cooling heat exchanger (1).

2. The heat recovery device according to claim 1, characterized in that: The surface cooling heat exchanger (1) is arranged on a side of the fin heat exchanger (4) close to the fan (10), and is located between the fan (10) and the fin heat exchanger (4).

3. The heat recovery device according to claim 1, characterized in that: A first hot water exchange pipe is arranged inside the surface cooling heat exchanger (1); the input end of the first hot water exchange pipe is connected to the output end of the first water pump (2); the output end of the first hot water exchange pipe is connected to the hot water input end of the water tank (3); and the cold water output end of the water tank (3) is connected to the input end of the first water pump (2).

4. An air conditioner with a heat recovery device, characterized in that: The air conditioner comprises a heat pump system and a heat recovery device according to any one of claims 1 to 3, wherein the heat pump system comprises a fin heat exchanger (4), and the heat generated by the fin heat exchanger (4) is absorbed by a surface cooling heat exchanger (1) of the heat recovery device.

5. The air conditioner with a heat recovery device according to claim 4, characterized in that: The heat pump system further comprises a plate heat exchanger (7), a fan (10) and a compressor (6); the compressor (6) is connected to the fin heat exchanger (4) and the plate heat exchanger (7) respectively via a four-way valve; the fin heat exchanger (4) is connected to the plate heat exchanger (7) via an expansion valve (8); the fan (10) is arranged on one side of the fin heat exchanger (4) and is used to form an airflow from the air cooled by the fin heat exchanger (4) and blown into an application environment.

6. The air conditioner with a heat recovery device according to claim 5, characterized in that: The heat pump system further comprises a second water pump (9); a second water pipe is also arranged inside the plate heat exchanger (7); the input end of the second water pump (9) is connected to the water tank (3); the output end of the second water pump (9) is connected to the input end of the second water pipe; and the output end of the second water pipe is connected to the water tank (3).

7. The air conditioner with a heat recovery device according to claim 4, characterized in that: A heater is also provided in the water tank (3), and the heater is used to heat the domestic water in the water tank (3).

Images