Air source heat pump system utilizing waste heat in building

Abstract

The utility model relates to the technical field of air source heat pumps, in particular to an air source heat pump system utilizing waste heat in a building. The system comprises an exhaust air duct, a building internal waste hot air and fresh air duct communicated with the exhaust air duct, and a waste hot water collecting box, and first heat exchangers are arranged in the exhaust air duct and the fresh air duct; a first heat exchanger energy recovery section of the first heat exchanger is arranged at the outlet position of the exhaust air duct, a first heat exchanger energy utilization section of the first heat exchanger is arranged at the inlet position of the fresh air duct, and second heat exchangers are arranged in the fresh air duct and the waste hot water collecting box. A second heat exchanger energy recovery section of the second heat exchanger is arranged in the waste hot water collecting tank; and a second heat exchanger energy utilization section of the second heat exchanger is arranged at the air outlet end of the fresh air duct. The low-temperature waste heat recovery device has the advantages that low-temperature waste heat in a building is recovered, operation energy efficiency of the low-temperature waste heat recovery device is improved, and the energy consumption saving effect is remarkable.

Description

Technical Field

[0001] The utility model and the technical field of air source heat pumps particularly relate to an air source heat pump system that utilizes waste heat in a building. Background Art

[0002] An air source heat pump is an energy-saving device that uses high-level energy to make heat flow from a low-level heat source, air, to a high-level heat source. Air, as the low-level heat source of the heat pump, is inexhaustible, available everywhere and can be obtained free of charge. It is also relatively easy to install and use.

[0003] However, the performance of air-source heat pumps varies with outdoor climate changes. In cold northern my country, where winter temperatures are low, air-source heat pumps' reliability deteriorates, causing a sharp drop in their energy efficiency ratio (EER). This can lead to insufficient heating capacity and the need for auxiliary heaters, which consumes significant energy. Furthermore, when the outdoor temperature falls below 0°C, frost forms on the evaporator surface of the air-source heat pump. As the frost layer thickens, the evaporation temperature drops, increasing compressor energy consumption and impacting heat pump unit operation.

[0004] Existing technology, such as the wastewater heat recovery air-source heat pump system (CN2016211249385), can only recover heat energy from wastewater, resulting in a low recovery rate. With my country's economic development, urban buildings, such as large shopping malls, office buildings, and gymnasiums, are increasing in number and floor area. Various equipment, lighting, and personnel within these buildings continuously generate heat, generating waste smoke and wastewater that are directly discharged. In response to the current demand for green development, it is necessary to recover low-temperature waste heat within buildings to reduce energy consumption and improve energy utilization.

[0005] Therefore, it is necessary to design an air source heat pump system that utilizes waste heat in the building to solve the above problems. Utility Model Content

[0006] The purpose of the utility model is to provide an air source heat pump system that utilizes waste heat in a building, so as to overcome the above-mentioned deficiencies in the current prior art.

[0007] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0008] An air source heat pump system that utilizes waste heat in a building, comprising an exhaust duct, waste heat gas in the building connected to the exhaust duct, a fresh air duct, and a waste hot water collection tank, characterized in that: a first heat exchanger is arranged in the exhaust duct and the fresh air duct; a first heat exchanger energy recovery section of the first heat exchanger is placed at the outlet position of the exhaust duct, and a first heat exchanger energy utilization section of the first heat exchanger is placed at the inlet position of the fresh air duct; a second heat exchanger is arranged in the fresh air duct and the waste hot water collection tank, a second heat exchanger energy recovery section of the second heat exchanger is placed in the waste hot water collection tank, and a second heat exchanger energy utilization section of the second heat exchanger is placed at the outlet end of the fresh air duct.

[0009] Preferably, the waste heat in the building is connected to the inlet of the exhaust duct; the outlet end of the fresh air duct is connected to an air source heat pump, and the air source heat pump is connected to the user's hot end.

[0010] Preferably, a filter is provided at the air inlet of the fresh air duct, and the filter is placed at the front end of the first heat exchanger energy utilization section of the first heat exchanger.

[0011] Preferably, an exhaust fan is provided at the air outlet of the exhaust duct, and the exhaust fan is provided at the outlet position of the first heat exchanger energy recovery section of the first heat exchanger.

[0012] Preferably, a control valve is also provided on the first heat exchanger.

[0013] Preferably, the first heat exchanger is also externally connected to a temperature monitoring device.

[0014] Preferably, a fresh air fan is provided in the fresh air duct, and the fresh air fan is placed between the first heat exchanger and the second heat exchanger.

[0015] The beneficial effects of the present invention are as follows: the present technical solution recycles the low-temperature waste heat in the building, increases the temperature of the fresh air at the inlet of the air source heat pump unit, and improves its operating energy efficiency; at the same time, the system operates throughout the year, and the energy saving effect is significant; the temperature of the fresh air at the inlet of the air source heat pump unit is increased, and the frosting phenomenon of the evaporator in the low temperature environment in winter is reduced, the heat exchange capacity of the unit is avoided, and the service life of the unit is extended; the waste heat from the exhaust, smoke exhaust, wastewater, etc. in the building can be recycled and used to heat the outdoor fresh air at the inlet of the air source heat pump, and the inlet air temperature is increased, thereby improving the operating energy efficiency and energy supply quality of the air source heat pump unit, and reducing the impact of the low temperature environment on the air source heat pump unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a system diagram of an air source heat pump system that utilizes waste heat in a building according to the present utility model;

[0017] In the figure: 1 - air source heat pump, 2 - waste hot water collection tank, 3 - first heat exchanger, 4 - second heat exchanger,

[0018] 5 - exhaust duct, 6 - waste heat in the building, 7 - energy recovery section of the first heat exchanger,

[0019] 8 - exhaust fan, 9 - water inlet, 10 - filter, 11 - energy recovery section of the second heat exchanger, 12 - drain outlet, 13 - fresh air duct, 14 - filter,

[0020] 15 - first heat exchanger energy utilization section, 16 - fresh air fan, 17 - second heat exchanger energy utilization section, 18 - user hot end, 19 - temperature monitoring device, 20 - control valve. DETAILED DESCRIPTION

[0021] Reference Figure 1 , an air source heat pump system utilizing waste heat in a building, comprising an exhaust duct 5, waste heat gas 6 in the building connected to the exhaust duct, a fresh air duct 13, and a waste hot water collection tank 2;

[0022] The waste heat 6 in the building is connected to the inlet of the exhaust duct; the outlet end of the fresh air duct 13 is connected to the air source heat pump 1, and the air source heat pump 1 is connected to the user's hot end 18;

[0023] A first heat exchanger 3 is provided in the exhaust duct 5 and the fresh air duct 13; the first heat exchanger energy recovery section 7 of the first heat exchanger is placed at the outlet of the exhaust duct 5, and the first heat exchanger energy utilization section 15 of the first heat exchanger 3 is placed at the inlet of the fresh air duct 13;

[0024] In order to further filter the air in the fresh air duct 13 and ensure the quality of the air, a filter is provided at the air inlet of the fresh air duct 13, and the filter is placed at the front end of the first heat exchanger energy utilization section of the first heat exchanger;

[0025] In order to assist the exhaust duct 5 in exhausting air, an exhaust fan 8 is provided at the air outlet of the exhaust duct 5, and the exhaust fan 8 is provided at the outlet position of the first heat exchanger energy recovery section 7 of the first heat exchanger;

[0026] The first heat exchanger is further provided with a control valve 20, which controls the flow and switches the first heat exchanger.

[0027] The first heat exchanger 3 is also externally connected to a temperature monitoring device 19, which is used to detect the outdoor fresh air temperature and the exhaust air temperature in the building, and to control the working condition of the first heat exchanger 3 based on this fact.

[0028] A second heat exchanger 4 is provided in the fresh air duct 13 and in the waste hot water collection tank 2. The second heat exchanger energy recovery section 11 of the second heat exchanger 4 is placed in the waste hot water collection tank 2. The second heat exchanger energy utilization section 17 of the second heat exchanger 4 is placed at the air outlet end of the fresh air duct 13.

[0029] In order to increase the air intake speed of the fresh air duct 13 , a fresh air blower 16 is provided in the fresh air duct 13 , and the fresh air blower 16 is placed between the first heat exchanger and the second heat exchanger 4 .

[0030] The working principle of this implementation case is: when operating 1 air source heat pump in winter, the outdoor fresh air temperature is always lower than the exhaust air temperature in the building, and 2 waste hot water collection tanks are always collecting waste hot water in the building. At this time, the first heat exchanger and the second heat exchanger are both in working condition.

[0031] In the exhaust duct 5, waste heat (such as smoke and air exhaust) from the building 6 passes through the energy recovery section of the first heat exchanger 7, where it collects heat and is then discharged outdoors by the exhaust fan 8. Simultaneously, waste hot water from the building passes through the water inlet 9, is filtered by the filter 10, and is collected in the waste hot water collection tank 2. After heat is recovered in the energy recovery section of the second heat exchanger 11, the cold water is discharged through the drain 12.

[0032] In the fresh air duct 13, the fresh air from the outside is filtered by the filter 14, preliminarily preheated in the first heat exchanger energy utilization section 15, and then sent to the second heat exchanger energy utilization section 17 by the fresh air fan 16 to continue to heat up. The heated air finally reaches the evaporator of the air source heat pump 1, participates in the heating cycle, and provides the required heat for the user's hot end 18.

[0033] During summer operation of the air-source heat pump (1), at certain high-temperature moments, the outdoor temperature may be higher than the indoor temperature. If the temperature monitoring device (19) detects that the outdoor fresh air temperature is higher than the building's exhaust air temperature, the control valve (20) is closed. During this time, the first heat exchanger (3) is inoperative, leaving only the second heat exchanger (4) in operation. Fresh air from the outdoors is heated solely by the energy utilization section (17) of the second heat exchanger before being fed into the air-source heat pump (1).

[0034] The benefits of the present invention are that the present technical solution recycles low-temperature waste heat in the building, increases the temperature of fresh air at the inlet of the air source heat pump unit, and improves its operating energy efficiency; at the same time, the system operates throughout the year, saving significant energy consumption; it increases the temperature of fresh air at the inlet of the air source heat pump unit, reduces the frosting of the evaporator in the low temperature environment in winter, avoids the decline of the heat exchange capacity of the unit, and extends the service life of the unit; it can recycle waste heat from exhaust, smoke exhaust, wastewater, etc. in the building, and use it to heat the outdoor fresh air at the inlet of the air source heat pump, increase the air inlet temperature, thereby improving the operating energy efficiency and energy supply quality of the air source heat pump unit, and reducing the impact of the low temperature environment on the air source heat pump unit.

[0035] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An air source heat pump system utilizing waste heat from a building, comprising an exhaust duct, a waste heat duct for the building connected to the exhaust duct, a fresh air duct, and a waste hot water collection tank, characterized in that: A first heat exchanger is arranged in the exhaust duct and the fresh air duct; the first heat exchanger energy recovery section of the first heat exchanger is placed at the outlet of the exhaust duct, and the first heat exchanger energy utilization section of the first heat exchanger is placed at the inlet of the fresh air duct; a second heat exchanger is arranged in the fresh air duct and the waste hot water collection tank, the second heat exchanger energy recovery section of the second heat exchanger is placed in the waste hot water collection tank, and the second heat exchanger energy utilization section of the second heat exchanger is placed at the outlet end of the fresh air duct.

2. The air source heat pump system utilizing waste heat in a building according to claim 1, characterized in that: The waste heat in the building is connected to the inlet of the exhaust duct; the outlet end of the fresh air duct is connected to an air source heat pump, and the air source heat pump is connected to the user's hot end.

3. The air source heat pump system utilizing waste heat in a building according to claim 1, characterized in that: A filter is provided at the air inlet of the fresh air duct, and the filter is placed at the front end of the first heat exchanger energy utilization section of the first heat exchanger.

4. The air source heat pump system utilizing waste heat in a building according to claim 1, characterized in that: An exhaust fan is provided at the air outlet of the exhaust duct, and the exhaust fan is provided at the outlet position of the first heat exchanger energy recovery section of the first heat exchanger.

5. The air source heat pump system utilizing waste heat in a building according to claim 4, characterized in that: The first heat exchanger is also provided with a control valve.

6. The air source heat pump system utilizing waste heat in a building according to claim 5, characterized in that: The first heat exchanger is also externally connected to a temperature monitoring device.

7. The air source heat pump system utilizing waste heat in a building according to claim 1, characterized in that: A fresh air fan is provided in the fresh air duct, and the fresh air fan is placed between the first heat exchanger and the second heat exchanger.

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