A condensate recycling system for combined air conditioning units

Abstract

The invention discloses a condensate recycling system for a combined air-conditioning unit, which comprises a first water storage tank and a second water storage tank, the tops of the two water storage tanks are lower than the bottom of the combined air-conditioning unit, the water collecting pan of the combined air-conditioning unit is connected to the water inlet at the top of the first water storage tank through a condensate recovery pipe, the water outlet at the bottom of the first water storage tank is connected to the water inlet end of a precooling heat exchanger through a first water outlet pipe, a first water pump and a first one-way check valve are arranged on the first water outlet pipe, the water outlet end of the precooling heat exchanger is connected to the water inlet at the top of the second water storage tank through a return pipe, the water outlet at the bottom of the second water storage tank is connected to the water collecting bottom plate of a cooling tower through a second water outlet pipe, a second water pump and a second one-way check valve are arranged on the second water outlet pipe, and the first water storage tank and the second water storage tank are connected through a first overflow pipe. Compared with the prior art, the invention has the following advantages: it can improve the utilization efficiency of condensate water and save energy.

Description

Technical Field

[0001] The invention relates to the technical field of condensed water recycling, and in particular to a condensed water recycling system for a combined air-conditioning unit. Background Art

[0002] Combined air conditioning units are air handling equipment assembled from various air handling functional sections. They are widely used in many industries and large places such as factories, shopping malls, hospitals, supermarkets, etc. Studies have shown that the condensed water of air conditioners is generally 10-15℃, which shows that this part of water resources contains huge cooling capacity. In summer, the amount of condensed water generated in these air conditioning boxes every day is huge, and the temperature is low, there are few impurities, and the hardness is low, which has a high recycling value.

[0003] The traditional way of treating air conditioning condensate water is to directly discharge the condensate water into the sewer as waste water resources, which not only causes a large amount of water waste, but also increases the pressure on the city's drainage system and the risk of environmental pollution. This is obviously contrary to the energy conservation and emission reduction policy advocated by the country. Therefore, in order to prevent the hidden dangers caused by improper condensate water discharge and realize the rational and efficient use of energy, it is necessary to study the ways and methods of recycling condensate water from combined air conditioning units. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a condensate recovery and utilization system for a combined air conditioning unit, so as to achieve the purpose of improving the utilization efficiency of condensate and saving energy.

[0005] The present invention is achieved through the following technical solutions:

[0006] A condensate recovery and utilization system for a combined air-conditioning unit, the combined air-conditioning unit comprising a precooling heat exchanger, the condensate recovery and utilization system comprising a first water storage tank and a second water storage tank arranged side by side horizontally, the tops of the two water storage tanks being lower than the bottom of the combined air-conditioning unit, the water collecting pan of the combined air-conditioning unit being connected to the water inlet at the top of the first water storage tank through a condensate recovery pipe, the water outlet at the bottom of the first water storage tank being connected to the water inlet end of the precooling heat exchanger through a first water outlet pipe, a first water pump and a first one-way check valve being provided on the first water outlet pipe, the water outlet end of the precooling heat exchanger being connected to the water inlet at the top of the second water storage tank through a return pipe, the water outlet at the bottom of the second water storage tank being connected to a second water outlet pipe, the end of the second water outlet pipe extending to the water collecting bottom plate of the cooling tower, the second water outlet pipe being provided with a second water pump and a second one-way check valve;

[0007] A first overflow port is provided on the side wall of the first water storage tank near the top of the first water storage tank, and the first overflow port of the first water storage tank is connected to the second water storage tank via a first overflow pipe.

[0008] Furthermore, a first high-level liquid gauge and a first low-level liquid gauge are arranged vertically on the side wall of the first water storage tank, and the height of the first high-level liquid gauge is lower than the first overflow port, and the height of the first low-level liquid gauge is higher than the water outlet of the first water storage tank; a second high-level liquid gauge and a second low-level liquid gauge are arranged vertically on the side wall of the second water storage tank, and the height of the second high-level liquid gauge is lower than the first overflow pipe, and the height of the second low-level liquid gauge is higher than the water outlet of the second water storage tank.

[0009] Furthermore, a second overflow port is opened on the side wall of the second water storage tank, and the second overflow port of the second water storage tank is externally connected to a second overflow pipe, and the height position of the second overflow port is between the first overflow pipe and the second high-level liquid level gauge.

[0010] Furthermore, a filter assembly is provided on the condensate recovery pipe.

[0011] Furthermore, a first sewage outlet is provided at the bottom of the first water storage tank, and a second sewage outlet is provided at the bottom of the second water storage tank.

[0012] Furthermore, the surfaces of the condensate recovery pipe, the filter assembly, the first water storage tank, the second water storage tank, the first water outlet pipe and the second water outlet pipe are all wrapped with thermal insulation cotton.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] The present invention provides a combined air-conditioning unit condensate recycling system, which realizes the recycling and graded utilization of the combined air-conditioning unit condensate by setting two water storage tanks, two water pumps and corresponding pipelines, namely: the condensate in the first water storage tank is used in the precooling heat exchanger to precool the outdoor high-temperature fresh air, realizing the first-level utilization; the condensate in the first water storage tank is recycled in the second water storage tank after passing through the precooling heat exchanger, and then pumped to the water collecting chassis at the bottom of the cooling tower for cooling tower water replenishment, realizing the second-level utilization. The system has a simple structure, ingenious design, convenient installation and construction, and a high degree of automation, realizing the efficient utilization of the combined air-conditioning unit condensate, improving the operating efficiency of the refrigeration system, and effectively reducing the power consumption and water resource consumption, and has a high value of promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention.

[0016] Numbers in the figure: 1 combined air-conditioning unit, 2 condensate recovery pipe, 3 filter assembly, 4 first water storage tank, 5 first high-level liquid gauge, 6 first sewage outlet, 7 first low-level liquid gauge, 8 first water outlet pipe, 9 first water pump, 10 first one-way check valve, 11 precooling heat exchanger, 12 return pipe, 13 first overflow pipe, 14 second water storage tank, 15 second overflow pipe, 16 second high-level liquid gauge, 17 second sewage outlet, 18 second low-level liquid gauge, 19 second water outlet pipe, 20 second water pump, 21 second one-way check valve, 22 cooling tower. DETAILED DESCRIPTION

[0017] The following is a detailed description of an embodiment of the present invention. This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation method and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiment.

[0018] See also Figure 1 This embodiment discloses a condensate recycling system for a combined air-conditioning unit. The combined air-conditioning unit 1 includes a precooling heat exchanger 11. The precooling heat exchanger 11 is located behind the fresh air outlet of the fresh air section of the combined air-conditioning unit 1 and is used to precool the outdoor high-temperature fresh air. The condensate recycling system includes a first water storage tank 4 and a second water storage tank 14 arranged horizontally side by side. The tops of the two water storage tanks are lower than the bottom of the combined air-conditioning unit 1. The water collection tray of the combined air-conditioning unit 1 is connected to the water inlet at the top of the first water storage tank 4 through a condensate recovery pipe 2. The condensate recovery pipe 2 is used to recover the air condensate of the fresh air section and the surface cooling section of the combined air-conditioning unit 1; a filter assembly 3 is provided on the condensate recovery pipe 2. The water outlet at the bottom of the first water storage tank 4 is connected to the water inlet end of the precooling heat exchanger 11 through the first water outlet pipe 8, and the first water outlet pipe 8 is provided with a first water pump 9 and a first one-way check valve 10. The water outlet end of the precooling heat exchanger 11 is connected to the water inlet at the top of the second water storage tank 14 through the return pipe 12. The water outlet at the bottom of the second water storage tank 14 is connected to the second water outlet pipe 19, and the end of the second water outlet pipe 19 extends to the water collecting chassis of the cooling tower 22. The second water outlet pipe 19 is provided with a second water pump 20 and a second one-way check valve 21; a first overflow port is opened on the side wall of the first water storage tank 4 near the top of the first water storage tank 4, and the first overflow port of the first water storage tank 4 is connected to the second water storage tank 14 through the first overflow pipe 13.

[0019] Specifically, a first high-level liquid gauge 5 and a first low-level liquid gauge 7 are arranged vertically on the side wall of the first water storage tank 4, and the height of the first high-level liquid gauge 5 is lower than the first overflow port, and the height of the first low-level liquid gauge 7 is higher than the water outlet of the first water storage tank 4; a second high-level liquid gauge 16 and a second low-level liquid gauge 18 are arranged vertically on the side wall of the second water storage tank 14, and the height of the second high-level liquid gauge 16 is lower than the first overflow pipe 13, and the height of the second low-level liquid gauge 18 is higher than the water outlet of the second water storage tank 14. A second overflow port is opened on the side wall of the second water storage tank 14, and the second overflow port of the second water storage tank 14 is externally connected to a second overflow pipe 15, and the height position of the second overflow port is between the first overflow pipe 13 and the second high-level liquid gauge 16.

[0020] A first sewage outlet 6 is provided at the bottom of the first water storage tank 4, and a second sewage outlet 17 is provided at the bottom of the second water storage tank 14. The first sewage outlet 6 and the second sewage outlet 17 are closed under normal working conditions. The surfaces of the condensed water recovery pipe 2, the filter assembly 3, the first water storage tank 4, the second water storage tank 14, the first water outlet pipe 8 and the second water outlet pipe 19 are all wrapped with thermal insulation cotton to slow down the heat exchange process between the condensed water and the outside world, reduce the loss of cold capacity, and maintain the cold capacity of the condensed water.

[0021] The working process of this condensed water recovery system is:

[0022] Under normal working conditions, the condensed water generated by the fresh air section and the surface cooling section of the combined air conditioning unit 1 is affected by its own gravity and height difference, and passes through the condensed water recovery pipe 2 and the filter assembly 3 in turn, and is collected in the first water storage tank 4. When the condensed water in the first water storage tank 4 reaches the set height of the first high-level liquid level gauge 5, the first water pump 9 is triggered to start, and the condensed water in the first water storage tank 4 is pumped out to the precooling heat exchanger 11 of the fresh air section in the combined air conditioning unit 1. The coldness in the low-temperature condensed water is used to precool the outdoor high-temperature fresh air. After the fresh air is cooled, the effect of saving the power consumption of the refrigeration machine can be achieved. The condensed water coming out of the precooling heat exchanger 11 flows into the second water storage tank 14 through the return pipe 12, and is collected by the second water storage tank 14. At this time, the condensed water still has a certain amount of coldness. When the condensed water in the second water storage tank 14 reaches the set height of the second high-level liquid level gauge 16, the second water pump 20 is triggered to start, and the condensed water in the second water storage tank 14 is pumped into the water collecting pan of the cooling tower 22 for replenishing water to the cooling tower 22. This can improve the refrigeration operation efficiency and cooling capacity of the cooling tower 22 and save electricity and tap water consumption.

[0023] When the water inflow of the condensed water recovery pipe 2 is greater than the water outflow in the first water outlet pipe 8, the water level of the first water storage tank 4 continues to rise. When the liquid level rises to the height of the first overflow pipe 13, the condensed water in the first water storage tank 4 will overflow into the second water storage tank 14, and after mixing with the condensed water in the second water storage tank 14, the original condensed water temperature in the second water storage tank 14 can be reduced, which is conducive to improving the refrigeration operation efficiency and cooling capacity of the cooling tower 22. If the amount of condensed water is large, the unused condensed water can be discharged from the second overflow pipe 15 for other uses.

[0024] When the water inflow of the condensate recovery pipe 2 is less than the water outflow in the first water outlet pipe 8, the water level of the first water storage tank 4 continues to drop. When the liquid level drops to the set height of the first low-level liquid level gauge 7, the first water pump 9 is triggered to shut down, thereby preventing the first water pump 9 from running idle and enhancing the safety of the system. Similarly, when the water level of the second water storage tank 14 continues to drop to the set height of the second low-level liquid level gauge 18, the second water pump 20 is also triggered to shut down.

[0025] When the system stops running, the first drain port 6 at the bottom of the first water storage tank 4 and the second drain port 17 at the bottom of the second water storage tank 14 can be opened to discharge the remaining condensed water and impurities in the tanks.

[0026] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A condensate recovery and utilization system for a combined air conditioning unit, the combined air conditioning unit (1) comprising a precooling heat exchanger (11), characterized in that: The condensed water recycling system comprises a first water storage tank (4) and a second water storage tank (14) which are arranged horizontally side by side, the tops of the two water storage tanks being lower than the bottom of the combined air conditioning unit (1), the water collecting pan of the combined air conditioning unit (1) being connected to the water inlet at the top of the first water storage tank (4) via a condensed water recovery pipe (2), the water outlet at the bottom of the first water storage tank (4) being connected to the water inlet end of the precooling heat exchanger (11) via a first water outlet pipe (8), and the first water outlet pipe (8) A first water pump (9) and a first one-way check valve (10) are provided on the precooling heat exchanger (11); the water outlet of the precooling heat exchanger (11) is connected to the water inlet at the top of the second water storage tank (14) through a return pipe (12); the water outlet at the bottom of the second water storage tank (14) is connected to a second water outlet pipe (19); the end of the second water outlet pipe (19) extends to the water collecting bottom plate of the cooling tower (22); the second water outlet pipe (19) is provided with a second water pump (20) and a second one-way check valve (21); A first overflow port is provided on the side wall of the first water storage tank (4) near the top of the first water storage tank (4), and the first overflow port of the first water storage tank (4) is connected to the second water storage tank (14) via a first overflow pipe (13).

2. A condensate recovery system for a combined air conditioning unit according to claim 1, characterized in that: A first high-level liquid gauge (5) and a first low-level liquid gauge (7) are arranged vertically on the side wall of the first water storage tank (4), and the height of the first high-level liquid gauge (5) is lower than the first overflow port, and the height of the first low-level liquid gauge (7) is higher than the water outlet of the first water storage tank (4); a second high-level liquid gauge (16) and a second low-level liquid gauge (18) are arranged vertically on the side wall of the second water storage tank (14), and the height of the second high-level liquid gauge (16) is lower than the first overflow pipe (13), and the height of the second low-level liquid gauge (18) is higher than the water outlet of the second water storage tank (14).

3. A condensate recovery system for a combined air conditioning unit as claimed in claim 2, characterized in that: A second overflow port is provided on the side wall of the second water storage tank (14); the second overflow port of the second water storage tank (14) is externally connected to a second overflow pipe (15); the height of the second overflow port is between the first overflow pipe (13) and the second high-level liquid level gauge (16).

4. A condensate recovery system for a combined air conditioning unit as claimed in claim 1, characterized in that: The condensate recovery pipe (2) is provided with a filter assembly (3).

5. The condensate recovery and utilization system of a combined air conditioning unit according to claim 1, characterized in that: The first water storage tank (4) is provided with a first sewage outlet (6) at the bottom, and the second water storage tank (14) is provided with a second sewage outlet (17) at the bottom.

6. A condensate recovery system for a combined air conditioning unit as claimed in claim 4, characterized in that: The surfaces of the condensate recovery pipe (2), the filter assembly (3), the first water storage tank (4), the second water storage tank (14), the first water outlet pipe (8) and the second water outlet pipe (19) are all wrapped with thermal insulation cotton.

Images