Auxiliary system for improving working efficiency of air source heat pump by using foundation pit dewatering well

Abstract

The utility model discloses an auxiliary system for improving the working efficiency of an air source heat pump through a foundation pit dewatering well. The auxiliary system comprises a water pumping assembly arranged in the foundation pit dewatering well, a main pipeline arranged on the ground surface and a heat exchange pipeline arranged on the periphery of an air source heat pump outdoor unit in a surrounding mode. The water outlet end of the water pumping assembly communicates with the water inlet end of the main pipeline, the water outlet end of the main pipeline communicates with the water inlet end of the heat exchange pipeline, and the water outlet end of the heat exchange pipeline communicates with a water using point. The heat exchange pipeline covers an air inlet of the air source heat pump outdoor unit. The underground water resource can be fully utilized, the power consumption of the air source heat pump can be reduced, the working efficiency is improved, the power utilization cost is saved, the installation and maintenance cost is low, and the system is more efficient and environment-friendly.

Description

Technical Field

[0001] The utility model belongs to the field of air source heat pumps, in particular to an auxiliary system which utilizes a foundation pit dewatering well to improve the working efficiency of an air source heat pump. Background Art

[0002] The air source heat pump is a highly efficient energy-saving device. It uses the reverse Carnot cycle principle to absorb heat from the low-level heat source of air, and converts it into high-level heat energy through the work of the compressor for heating or hot water. Therefore, its working efficiency is greatly affected by the ambient temperature. For example, the outside temperature is low in winter, and the air temperature sucked by the outdoor unit of the air source heat pump is also low. Then the compressor will inevitably consume more power to convert the low-temperature air into high-level heat energy to provide the required heating or hot water required by the water point; similarly, in summer, the temperature can be as high as 40°C. To achieve the cooling effect, it also requires more power to achieve the cooling effect. Therefore, under extremely low or high temperature conditions, the working efficiency of the heat pump system will drop significantly, and it will not be able to provide a stable energy supply.

[0003] Groundwater resources are a common renewable energy source with a relatively stable temperature that is not affected by climate and seasonal changes. The common geothermal heat pump system currently uses groundwater in foundation pit precipitation wells for heat exchange to achieve cooling or heating effects. However, the system requires the heat exchanger and water circulation pipeline to be pre-buried underground during installation, which is difficult to construct and has high installation and maintenance costs. In addition, since the heat exchanger and water circulation pipeline need to be in contact with groundwater, there may be problems such as pipeline corrosion and water pollution. Utility Model Content

[0004] In order to solve the above-mentioned deficiencies in the prior art, the utility model aims to provide an auxiliary system for improving the working efficiency of the air source heat pump by utilizing the foundation pit dewatering well, so as to achieve the purpose of combining the groundwater in the foundation pit dewatering well with the air source heat pump and reducing the energy consumption of the air source heat pump.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] An auxiliary system for improving the working efficiency of an air source heat pump by using a foundation pit dewatering well, comprising a pumping assembly arranged in the foundation pit dewatering well, a main pipeline arranged on the ground surface, and a heat exchange pipeline arranged around the outer periphery of an outdoor unit of the air source heat pump;

[0007] The water outlet of the pumping component is connected to the water inlet of the main pipeline, the water outlet of the main pipeline is connected to the water inlet of the heat exchange pipeline, and the water outlet of the heat exchange pipeline is connected to the water use point; the heat exchange pipeline covers the air inlet setting of the air source heat pump outdoor unit.

[0008] As a limitation of the utility model: a pressure relief pipeline is also provided on the main pipeline, a water inlet end of the pressure relief pipeline is connected to the main pipeline, a water outlet end of the pressure relief pipeline is connected to a water use point, and a pressure relief valve for controlling water flow is provided on the pressure relief pipeline.

[0009] As another limitation of the present invention: a pressure gauge for measuring the water pressure in the heat exchange pipeline is provided on the heat exchange pipeline.

[0010] As a further limitation of the present invention: valves are provided at both the water inlet and the water outlet of the heat exchange pipeline.

[0011] As another limitation of the present invention: the main pipeline, the pressure relief pipeline and the heat exchange pipeline are all made of PVC pipes.

[0012] Due to the adoption of the above technical solution, the utility model has the following beneficial effects compared with the prior art:

[0013] The utility model makes comprehensive use of the groundwater resources in the air source heat pump and the foundation pit precipitation well. The groundwater has a constant temperature characteristic and is not affected by extreme weather outside. The groundwater is pumped to the main pipeline on the surface through the pumping assembly, and then enters the heat exchange pipeline. Because the heat exchange pipeline is arranged around the periphery of the outdoor unit and covers the air inlet of the outdoor unit, taking winter heating as an example, the extreme temperature in winter can reach -25.5℃. When the air source heat pump is working, the cold air contacts the heat exchange pipeline before being sucked into the outdoor unit, and the water in the heat exchange pipeline is constant temperature, which is equivalent to heating the cold air first. Then the air entering the outdoor unit through the air inlet will be higher than -25.5℃. Compared with the air source heat pump directly heating the air at -25.5℃, this method reduces the power consumption of the air source heat pump and also realizes the effective utilization of groundwater resources.

[0014] To sum up, the utility model can not only make full use of groundwater resources, but also reduce the power consumption of the air source heat pump, improve work efficiency, save electricity costs, and has low installation and maintenance costs, and is more efficient and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention is described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0016] Figure 1 This is a schematic diagram of the application structure of an embodiment of the utility model;

[0017] Figure 2 It is a three-dimensional structural schematic diagram of the outdoor unit, the heat exchange pipeline, the first trunk pipeline and the second trunk pipeline in the embodiment of the utility model.

[0018] In the figure: 1-water pump, 2-water pumping pipeline, 3-first main pipeline, 4-second main pipeline, 5-heat exchange pipeline, 6-outdoor unit, 7-air inlet, 8-pressure relief pipeline, 9-water point, 10-valve, 11-ground surface, 12-foundation pit dewatering well, 13-pressure relief valve. DETAILED DESCRIPTION

[0019] The preferred embodiment of the utility model is described below in conjunction with the accompanying drawings. It should be understood that the auxiliary system described herein for improving the working efficiency of an air source heat pump using a foundation pit dewatering well is a preferred embodiment, which is only used to illustrate and explain the utility model and does not constitute a limitation on the utility model.

[0020] This embodiment is an auxiliary system added on the basis of the existing air source heat pump, and the structure and internal pipelines of the original air source heat pump outdoor unit remain unchanged.

[0021] like Figure 1-2 As shown, this embodiment includes a pumping assembly arranged in a foundation pit dewatering well 12, a first trunk pipeline 3 arranged on the ground surface 11, and a heat exchange pipeline 5 arranged around the outer periphery of the air source heat pump outdoor unit 6, and the heat exchange pipeline 5 covers the air inlet 7 of the air source heat pump outdoor unit 6. Underground constant temperature water is pumped out through the pumping assembly and flows through the first trunk pipeline 3 and the heat exchange pipeline 5 in sequence, so that the air drawn into the outdoor unit 6 first contacts the heat exchange pipeline 5, and the heat exchange pipeline 5 heats up or cools down the air to a certain extent, so that the temperature of the air entering the outdoor unit 6 will be relatively balanced, and there will be no phenomenon of extremely high or extremely low temperature, so that the work done by the air source heat pump during heating or cooling will be reduced, thereby saving electricity costs and improving the working efficiency of the air source heat pump.

[0022] like Figure 1 As shown, the pumping assembly includes a pump 1 fixed to the bottom of the foundation pit dewatering well 12, and a pumping pipeline 2 connected to the pump 1. The pump 1 adopts the existing technology. Figure 1 The drawing of the water pump 1 is for illustration only. The outlet end of the water pumping pipeline 2 is connected to the inlet end of the first trunk pipeline 3, where the outlet end of the water pumping pipeline 2 refers to the end located above the ground surface 11, the outlet end of the first trunk pipeline 3 is connected to the inlet end of the heat exchange pipeline 5, the heat exchange pipeline 5 is arranged around the periphery of the outdoor unit 6, the outlet end of the heat exchange pipeline 5 is connected to the second trunk pipeline 4, and the second trunk pipeline 4 is connected to the water point 9. Figure 1 , Figure 2 The direction of the arrow in the middle is the direction of water flow. When the air source heat pump outdoor unit 6 is working, water is pumped from the foundation pit dewatering well 12 to the ground surface 11, then flows through the heat exchange pipeline 5, and finally flows from the second trunk pipeline 4 to the water point 9 to provide sanitary water for toilet cleaning, etc. Of course, the water outlet end of the heat exchange pipeline 5 can also be directly connected to the water point 9.

[0023] Figure 1 Three foundation pit dewatering wells 12 are shown in the figure, each of which is provided with a set of pumping components, and the water outlets of the three pumping components are all connected to the first trunk pipeline 3, and the number of foundation pit dewatering wells 12 can be adjusted according to actual needs. The pumping components in this embodiment can select any structure in the prior art, as long as they can pump out the water in the foundation pit dewatering well 12.

[0024] like Figure 2 As shown, in order to control the water flow in the heat exchange pipeline 5, valves 10 are provided at the water inlet and outlet of the heat exchange pipeline 5, and a pressure gauge for measuring the water pressure in the pipeline is provided on the heat exchange pipeline 5. The pressure gauge adopts the existing technology and is Figure 1 , Figure 2 Not shown in the figure, the opening and closing degree of the valve 10 is adjusted by observing the value of the pressure gauge to prevent damage caused by excessive water pressure in the heat exchange pipeline 5. It should be supplemented that Figure 2 The middle air inlet 7 is indicated by a dotted line only to distinguish it from the heat exchange pipeline 5 for easier observation.

[0025] Further, such as Figure 1 As shown, a pressure relief pipeline 8 is also branched from the first trunk pipeline 3, the water inlet end of the pressure relief pipeline 8 is connected to the first trunk pipeline 3, the water outlet end of the pressure relief pipeline 8 is connected to the water point 9, and the water outlet end of the second trunk pipeline 4 is also connected to the pressure relief pipeline 8. Finally, the water in the second trunk pipeline 4 and the pressure relief pipeline 8 is collected and flows to the water point 9. A pressure relief valve 13 for controlling the water flow is provided on the pressure relief pipeline 8. When the water flow pumped to the surface 11 is too large and the water flow rate circulating in the heat exchange pipeline 5 is low, the pressure relief valve 13 is opened to prevent the pipeline from being damaged due to excessive pressure.

[0026] In this embodiment, the pumping pipeline 2, the first trunk pipeline 3, the second trunk pipeline 4, the pressure relief pipeline 8 and the heat exchange pipeline 5 are all made of PVC pipes, which have the advantages of easy installation, low cost and corrosion resistance.

[0027] The installation process of this embodiment is as follows: install a water pump 1 in a deep foundation pit dewatering well 12 and connect the water pumping pipeline 2, then install the first trunk pipeline 3, then bend and fix the PVC hose according to the size of the outdoor unit 6 to form a heat exchange pipeline 5, install the valve 10, the pressure relief pipeline 8 and the pressure relief valve 13 on the heat exchange pipeline 5, and connect the heat exchange pipeline 5 to the first trunk pipeline 3, then connect the water outlet of the heat exchange pipeline 5 to the second trunk pipeline 4, connect the second trunk pipeline 4 to the pressure relief pipeline 8, and finally connect the water outlet of the pressure relief pipeline 8 to the water point 9. The system has a simple structure and is easy to construct. It does not require the burial of heat exchangers and water circulation pipelines, and the installation cost and maintenance cost are greatly reduced.

[0028] The working principle of this embodiment is:

[0029] In winter, the outside air temperature is about -25.5℃, and the groundwater temperature is 15℃-17℃ all year round. After the pumping component pumps out the groundwater, it enters the heat exchange pipeline 5. When the outdoor unit 6 is working, the air contacts the heat exchange pipeline 5 before entering the outdoor unit 6 through the air inlet 7. The heat exchange pipeline 5 plays a role in heating the cold air, so that the air temperature entering the outdoor unit 6 is higher than -25.5℃. Then, when the air source heat pump heats this part of the air to heat the room, the power consumed will inevitably be reduced compared to directly heating the air at -25.5℃, thereby avoiding the problem of tripping or system failure due to excessive power consumption.

[0030] In summer, the outside air temperature can be as high as 40°C, and the groundwater temperature is between 15°C and 17°C all year round. After the pumping component pumps out the groundwater, it enters the heat exchange pipeline 5. When the outdoor unit 6 is working, the air contacts the heat exchange pipeline 5 before entering the outdoor unit 6 through the air inlet 7. The heat exchange pipeline 5 cools the high-temperature air, so that the air temperature entering the outdoor unit 6 is lower than 40°C. Then, when the air source heat pump works on this part of the cooled air to achieve the cooling effect, the power consumed will also be reduced.

[0031] It should be noted that there are many deep foundation pits and a large number of precipitation wells in the hospital project. Combining the foundation pit precipitation well 12 with the air source heat pump can not only realize the rational use of water resources in the foundation pit precipitation well 12, but also reduce the power consumption of the air source heat pump, thereby saving electricity costs to a greater extent.

[0032] It should be noted that the above is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiment, those skilled in the art can still modify the technical solutions recorded in the above embodiment or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An auxiliary system for improving the working efficiency of an air source heat pump by using a foundation pit dewatering well, characterized in that: It includes a pumping assembly arranged in a foundation pit dewatering well, a main pipeline arranged on the ground surface, and a heat exchange pipeline arranged around the outer periphery of an outdoor unit of an air source heat pump; The water outlet of the pumping component is connected to the water inlet of the main pipeline, the water outlet of the main pipeline is connected to the water inlet of the heat exchange pipeline, and the water outlet of the heat exchange pipeline is connected to the water use point; the heat exchange pipeline covers the air inlet setting of the air source heat pump outdoor unit.

2. The auxiliary system for improving the working efficiency of air source heat pump by using foundation pit dewatering well according to claim 1 is characterized in that: A pressure relief pipeline is also provided on the main pipeline. The water inlet end of the pressure relief pipeline is connected to the main pipeline, and the water outlet end of the pressure relief pipeline is connected to the water use point. A pressure relief valve for controlling the water flow is provided on the pressure relief pipeline.

3. The auxiliary system for improving the working efficiency of air source heat pump by using foundation pit dewatering well according to claim 1 or 2, characterized in that: The heat exchange pipeline is provided with a pressure gauge for measuring the water pressure in the pipeline.

4. The auxiliary system for improving the working efficiency of air source heat pump by using foundation pit dewatering well according to claim 3 is characterized in that: Valves are provided at the water inlet and outlet of the heat exchange pipeline.

5. The auxiliary system for improving the working efficiency of air source heat pump by using foundation pit dewatering well according to any one of claims 1, 2 and 4, characterized in that: PVC pipes are used for main pipelines, pressure relief pipelines and heat exchange pipelines.

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