A condensed water recycling system for a ground source heat pump system

Abstract

The present invention relates to a condensate recycling system of a soil source heat pump system, comprising a water collecting tank and a recycling mechanism, wherein a filtering device is provided at the inlet end of the water collecting tank, and the recycling mechanism comprises an infiltration device, wherein the infiltration device comprises an outlet pipe whose inlet end is connected to the outlet end of the water collecting tank, and the outlet end of the outlet pipe is connected to the inlet end of a water supply main pipe, and the water supply main pipe is a spiral tubular structure, and a water supply branch pipe is connected to the outer wall of the water supply main pipe, and the water supply branch pipe is radially distributed on the outer side of the water supply main pipe, and a water supply hole is provided on the water supply branch pipe, and the infiltration device also comprises a condensate water tank arranged between the water collecting tank and the outlet pipe, and a first water pump is provided in the condensate water tank, and the inlet end of the condensate water tank is connected to the outlet end of the water collecting tank. The present invention relates to a condensate recycling system of a soil source heat pump system, which has the advantages of saving water resources, improving the heat exchange efficiency of the soil source heat pump, and reducing the use cost of the enterprise.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pumps, and in particular to a condensed water recycling system of a soil source heat pump system. Background Art

[0002] The ground source heat pump is a device that uses the relatively stable temperature of the underground soil to complete heat exchange with the interior of the building through a pipe system deeply buried around the building. In winter, heat is taken from the soil to heat the building; in summer, heat is discharged to the soil to cool the building. It uses the soil as a heat source and a cold source, and provides heating or cooling to the building through a high-efficiency heat pump unit. The energy efficiency ratio of the high-efficiency heat pump unit can generally reach above 4.0. Compared with the traditional configuration of a chiller plus a boiler, the annual energy consumption can be saved by about 40%. The initial investment is relatively high, the machine room area is small, and the considerable water consumption of the conventional system cooling tower is saved. The operating cost is low, no harmful substances are produced, and there is no pollution to the environment, achieving the effect of environmental protection.

[0003] One of the disadvantages of ground source heat pumps is that the thermal conductivity of the soil is low, and the heat exchange capacity is small. Existing experience shows that its continuous heat absorption rate is generally 25W / m, so when the heat supply is constant, the heat exchange coil occupies a large area, and the laying of buried pipes (buried pipes are the vertical part of U-shaped heat exchange pipes) will increase the civil engineering costs, whether it is horizontal excavation layout or drilling vertical installation. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a condensate recovery and utilization system for a soil source heat pump system, so as to solve the problem of increased use cost due to the low thermal conductivity of soil when using the current soil source heat pump.

[0005] The present invention is achieved through the following technical scheme: a condensate recovery and utilization system of a soil source heat pump system, comprising a water collecting tank and a recovery mechanism, wherein a filtering device is provided at the inlet end of the water collecting tank, and the recovery mechanism comprises an infiltration device, wherein the infiltration device comprises an outlet pipe whose inlet end is connected to the outlet end of the water collecting tank, and the outlet end of the outlet pipe is connected to the inlet end of the water supply main pipe.

[0006] Furthermore, the infiltration device also includes a condensation water tank arranged between the water collecting tank and the water outlet pipe, and a first water pump is provided in the condensation water tank. The inlet end of the condensation water tank is connected to the outlet end of the water collecting tank, and the outlet end of the first water pump is connected to the inlet end of the water outlet pipe.

[0007] Furthermore, the water replenishment mother pipe is a spiral tubular structure, and a water replenishment branch pipe is connected to the outer wall of the water replenishment mother pipe. The water replenishment branch pipes are radially distributed on the outside of the water replenishment mother pipe, and water replenishment holes are opened on the water replenishment branch pipes.

[0008] Furthermore, the water replenishment mother pipe is a cylindrical spiral structure, and the inner side of the cylindrical spiral structure is surrounded by a columnar branch pipe cavity.

[0009] Furthermore, the water replenishment branch pipe is located on the end face of the water replenishment mother pipe away from the branch pipe cavity, and the end of the water replenishment branch pipe away from the branch pipe cavity is a closed structure.

[0010] Furthermore, a water replenishment inner tube is rotatably sleeved on the inner side of the water replenishment branch tube, an opening is provided at one end of the water replenishment inner tube close to the water replenishment main tube, and an end of the water replenishment inner tube away from the water replenishment main tube is a closed structure, a driving source is provided at a position between the outer side of the end of the water replenishment inner tube away from the water replenishment main tube and the inner side of the end of the water replenishment branch tube away from the water replenishment main tube, the end of the water replenishment inner tube away from the water replenishment main tube is connected to the working end of the driving source, and the water replenishment hole passes through the pipe walls of the water replenishment branch tube and the water replenishment inner tube.

[0011] Furthermore, the water replenishment holes are evenly arranged on the walls of the water replenishment branch pipe and the water replenishment inner pipe, and the water replenishment holes include a first through hole respectively opened in the water replenishment branch pipe and a second through hole opened in the water replenishment inner pipe, and the first through hole and the second through hole maximize the communication area between the inner cavity of the water replenishment branch pipe and the outer side of the water replenishment inner pipe when the water replenishment branch pipe rotates to completely overlap, and the first through hole and the second through hole block the communication between the inner cavity of the water replenishment branch pipe and the outer side of the water replenishment inner pipe when the water replenishment branch pipe rotates to completely separate.

[0012] Furthermore, the recovery mechanism also includes a soft water tank whose inlet end is connected to another outlet end of the water collecting tank, a second water pump is arranged in the soft water tank, and the outlet end of the second water pump is connected to the water supply network of the geothermal source system.

[0013] The beneficial effects of the present invention are as follows: a condensate recovery and utilization system of a soil source heat pump system of the present invention facilitates the fitting of the water supply main pipe and the buried pipe by setting the water supply main pipe as a spiral tubular structure, so that the water supply main pipe can transfer heat through the fitting between itself and the buried pipe while conveying water; a soft water tank connects the condensate water tank and the soil source heat pump water supply pipe, and the condensate is softened and then provided to the ground source heat pump for use, thereby saving water resources; and by setting up an infiltration system, the condensate is infiltrated into the soil near the buried pipe, thereby improving the thermal conductivity of the soil, thereby improving the heat exchange efficiency of the soil source heat pump and saving the company's use costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of Example 1;

[0015] Figure 2 This is a schematic diagram of the water replenishment main pipe structure of Example 1;

[0016] Figure 3 This is a side view of the water replenishment main pipe of Example 1;

[0017] Figure 4 This is a top view of the water replenishment main pipe of Example 1;

[0018] Figure 5 Schematic diagram of the internal structure of the water replenishment branch pipe in Example 1.

[0019] Among them: 1. water collecting tank; 2. condensate water tank; 3. water outlet main pipe; 4. flow meter; 5. water outlet branch pipe; 6. solenoid valve; 7. controller; 8. soil moisture sensor; 9. buried pipe; 10. drill hole; 11. backfill material; 12. water supply main pipe; 13. water supply branch pipe; 14. branch pipe cavity; 15. water supply inner pipe; 16. water supply hole; 17. drive source; 18. soft water tank. DETAILED DESCRIPTION

[0020] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] The following will be combined with the drawings in the embodiments of the invention to clearly and completely describe the technical solutions in the embodiments of the invention. Obviously, the described embodiments are only part of the embodiments of the invention, not all of the embodiments. Based on the embodiments of the invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the invention.

[0022] Example 1

[0023] like Figure 1-5 As shown, a condensate recovery and utilization system of a ground source heat pump system includes a water collecting tank 1 and a recovery mechanism. A filtering device is provided at the inlet end of the water collecting tank 1. The inlet end of the water collecting tank 1 is connected to the condensate pipe network of the ground source heat system to collect and store condensate. The filtering device can select a mesh filter to filter impurities in the condensate.

[0024] The recovery mechanism includes an infiltration device, which includes an outlet pipe whose inlet end is connected to the outlet end of the water collecting tank 1, and the outlet end of the outlet pipe is connected to the inlet end of the water replenishment main pipe 12. Specifically, a condensate tank 2 is also connected between the water collecting tank 1 and the water replenishment main pipe 12. The outlet pipe includes an outlet main pipe 3 and an outlet branch pipe 5. The outlet end of the water collecting tank 1 is connected to the condensate tank 2, the outlet main pipe 3, the outlet branch pipe 5, and the water replenishment main pipe 12 in sequence. A first water pump is installed in the condensate tank 2, and the first water pump is electrically connected to the controller 7. The controller 7 changes the condensate flow rate, condensate supply, etc. in the infiltration device by adjusting the water supply pressure of the first water pump. The first water pump is connected to the outlet main pipe to provide the required water pressure for the infiltration device as a whole.

[0025] A main valve is installed on the outlet main pipe to adjust the overall water volume of the infiltration device. A flow meter 4 and a solenoid valve 6 are installed on the outlet branch pipe. The model of the flow meter 4 can be selected: LWGY-N type, and the model of the solenoid valve 6 can be selected: 4V210-08 DC24V. The flow meter 4 and the solenoid valve 6 are externally connected to a controller 7. The controller 7 is also connected to a soil moisture sensor. The model of the soil moisture sensor can be selected: CSF11-60-A1-BG. The probe of the soil moisture sensor is buried in the backfill material near the buried pipe to detect the moisture content of the backfill material, and the switch of the solenoid valve 6 is controlled by the detected moisture content value. At the same time, the flow meter 4 is used to count and monitor the amount of water added each time the single outlet branch pipe 5 is opened.

[0026] The water replenishment mother pipe 12 is a spiral tubular structure, and the water replenishment mother pipe 12 is a cylindrical spiral structure. The inner side of the cylindrical spiral structure is surrounded by a columnar branch pipe cavity 14. When in use, the water replenishment mother pipe 12 is rotated and wrapped around the outer surface of the buried pipe 9, which is convenient for the water replenishment mother pipe 12 to fit with the buried pipe 9, so that the water replenishment mother pipe 12 can transfer heat through the fit between itself and the buried pipe 9 while conveying water. The outer pipe wall of the water replenishment mother pipe 12 is connected with a water replenishment branch pipe 13, and a threaded sealing connection can be selected between the water replenishment branch pipe 13 and the water replenishment mother pipe 12. A smooth through hole or a threaded through hole can be opened on the water replenishment mother pipe 12. When a smooth through hole is opened, the water replenishment branch pipe 13 can be selected not to be connected. At this time, condensed water penetrates directly from the water replenishment mother pipe 12 into the backfill material through the smooth through hole.

[0027] When the water replenishment branch pipe 13 is selected to be connected, the water replenishment branch pipe 13 is radially distributed on the outside of the water replenishment mother pipe 12. The contact area between the water replenishment mother pipe 12 and the backfill material is increased through the water replenishment branch pipe 13, and condensed water is infiltrated into the backfill material through the water replenishment branch pipe 13. The water replenishment branch pipe 13 is located on the end face of the water replenishment mother pipe 12 away from the branch pipe cavity 14. The preferred distribution mode of the water replenishment branch pipe 13 is to be horizontally connected with the water replenishment mother pipe 12 and evenly spaced, which is beneficial to ensure the uniformity of water infiltration of the water replenishment branch pipe 13, avoid waste of water resources, and improve the infiltration efficiency. The end of the water replenishment branch pipe 13 away from the branch pipe cavity 14 is a closed structure, which is convenient for forming a closed driving source 17 installation space between the water replenishment inner pipe 15, and a water replenishment hole 16 is opened on the water replenishment branch pipe 13. The water in the water replenishment branch pipe 13 infiltrates into the backfill material through the water replenishment hole 16.

[0028] A water replenishment inner tube 15 is provided on the rotating sealing sleeve inside the water replenishment branch pipe 13. An opening is provided at one end of the water replenishment inner tube 15 close to the water replenishment main tube 12, that is, the water replenishment inner tube 15 is connected with the water replenishment main tube 12. The end of the water replenishment inner tube 15 away from the water replenishment main tube 12 is a closed structure, and a closed installation space for a driving source 17 is formed between the water replenishment branch pipe 13. A driving source 17 is provided at a position between the outer side of one end of the water replenishment inner tube 15 away from the water replenishment main tube 12 and the inner side of one end of the water replenishment branch pipe 13 away from the water replenishment main tube 12. The driving source 17 can be a servo motor. The servo motor is electrically connected to the controller 7. The driving source 17 is automatically controlled by the detection data obtained by the controller 7 to adjust the water replenishment inner tube 15. The end of the water replenishment inner tube 15 away from the water replenishment main tube 12 is connected to the working end of the driving source 17. The water replenishment hole 16 runs through the pipe wall of the water replenishment branch pipe 13 and the water replenishment inner tube 15. The condensed water penetration of the water replenishment hole 16 is adjusted by adjusting the water replenishment inner tube 15.

[0029] The water replenishment holes 16 are evenly arranged on the walls of the water replenishment branch pipe 13 and the water replenishment inner pipe 15, so as to ensure the uniformity of penetration of each water replenishment branch pipe 13 into the surrounding, further improve the penetration efficiency, and avoid the waste of water resources and energy. The water replenishment holes 16 include a first through hole respectively opened in the water replenishment branch pipe 13 and a second through hole opened in the water replenishment inner pipe 15. When the water replenishment branch pipe 13 is rotated to completely overlap, the first through hole and the second through hole maximize the communication area between the inner cavity of the water replenishment branch pipe 13 and the outer side of the water replenishment inner pipe 15. When the water replenishment branch pipe 13 is rotated to completely separate, the first through hole and the second through hole block the communication between the inner cavity of the water replenishment branch pipe 13 and the outer side of the water replenishment inner pipe 15. That is, when the first through hole and the second through hole are opened, sufficient space should be left on the water replenishment branch pipe 13 and the water replenishment inner pipe 15. The unopened blocking part makes the water replenishment inner tube 15 rotate in the water replenishment branch pipe 13, and there are three positional relationships between the first through hole and the second through hole, namely, state one, the first through hole and the second through hole are completely corresponding, and the passing area of ​​the condensed water in the water replenishment branch pipe 13 from the second through hole to the first through hole is the largest; state two, the first through hole and the second through hole are completely non-corresponding, the inner side of the first through hole is the blocking part of the water replenishment inner tube 15 without a hole, that is, the first through hole does not pass water, and the outer side of the second through hole is the blocking part of the water replenishment branch pipe 13 without a hole, that is, the second through hole does not pass water, and this is the period of stopping water seepage; state three, the corresponding relationship between the first through hole and the second through hole is between state one and state two, and the area of ​​condensed water passing through the water replenishment hole 16 is variable and controllable.

[0030] The recovery mechanism also includes a soft water tank 18 whose inlet end is connected to the other outlet end of the water collecting tank 1. A second water pump is arranged in the soft water tank 18. The condensed water previously filtered by the filtering device is pressurized by the second water pump. The outlet end of the second water pump is connected to the water supply network of the geothermal source system to provide system water to the geothermal source system, thereby achieving the purpose of secondary recycling of condensed water and saving water resources.

[0031] Working principle: When in use, connect this system to the underground heat exchange network of the ground source heat pump system, bury the water supply main pipe 12 and the water supply branch pipe 13 in the backfill material 11 between the inner side of the borehole 10 and the buried pipe 9, bury the probe of the soil moisture sensor 8 in the backfill material 11 near the water supply branch pipe 13, set the predetermined water content value and the predetermined water pressure value in the controller 7, the predetermined water pressure value is that when the condensed water seeps out from the water supply hole 16, the backfill material near the water supply hole 16 will not be washed away due to excessive water pressure, and is determined by the pressure calculation company p=F / S, where the maximum value of p is the predetermined water pressure value, the predetermined water pressure value is a constant value, the pressure F is determined by the output power of the first water pump, and the pressure F is determined by the controller 7. The area S is determined by the corresponding positions of the first through hole and the second through hole and is controlled by the controller 7. That is, changing the output power of the first water pump and the seepage area of ​​the water replenishment hole 16 can control the seepage water pressure of the condensed water at the water replenishment hole 16. When the seepage area is constant, the water pressure is proportional to the flow rate. When the flow rate is constant, the water pressure is inversely proportional to the seepage area. At the same time, it can be seen from the relationship between the fluid flow rate, the flow cross-sectional area and the fluid flow rate that when the seepage area is the largest, the water pressure of the condensed water in the water replenishment branch pipe 13 can reach a maximum value within a predetermined water pressure value range, and the flow rate of the condensed water reaches a maximum value, so that the fluid flow rate reaches a maximum value per unit time, that is, the water replenishment efficiency is maximized.

[0032] The predetermined moisture content value is a fixed value. According to the moisture content of the backfill material detected by the soil moisture sensor 8, the controller 7 can calculate the required water replenishment amount. According to the predetermined water replenishment time in actual application, the controller 7 drives the water replenishment inner pipe 15 to adjust the size of the water seepage area of ​​the water replenishment hole 16 by adjusting the output power of the first water pump and the driving source 17, and controls the water replenishment time. It can not only complete the water replenishment within the predetermined time, but also control the operating power of the system within a reasonable range, save energy, and prevent waste of resources. By replenishing water into the backfill material, the heat transfer efficiency between the backfill material and the buried pipe 9 is improved, thereby improving the heat transfer efficiency of the ground source heat pump system, and achieving the purpose of improving energy utilization and reducing energy consumption.

[0033] During operation, the second water pump transports the condensed water in the soft water tank to the water supply network of the ground source heat pump, thereby achieving the purpose of recycling the condensed water.

[0034] In the above process, the time control switch controls the time step of the soil moisture sensor to measure the soil temperature; the soil moisture sensor measures the moisture content of the soil inside the borehole; the flow meter monitors the amount of water entering the infiltration tube; and the controller controls the switch of the solenoid valve according to the soil moisture content monitored by the soil moisture sensor and the amount of condensed water monitored by the flow meter.

[0035] Specifically, the time control switch controls the measurement frequency of the soil moisture sensor according to the set time step; the soil moisture sensor measures the moisture content of the soil inside the borehole according to the time step, and when the soil moisture content is lower than the set value, the solenoid valve is opened, and condensed water enters the permeation tube; the flow meter records the amount of condensed water entering the permeation tube after the solenoid valve is opened, and when the amount of condensed water can make the soil in the borehole reach a saturated state, the solenoid valve is closed, and condensed water no longer enters the permeation tube. Repeat the above steps until the next time step of 2t.

[0036] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A condensed water recycling system for a ground source heat pump system, characterized in that: It comprises a water collecting tank (1) and a recovery mechanism, wherein the inlet end of the water collecting tank (1) is provided with a filtering device, the recovery mechanism comprises an infiltration device, the infiltration device comprises a water outlet pipe whose inlet end is connected to the outlet end of the water collecting tank (1), the outlet end of the water outlet pipe is connected to the inlet end of the water replenishment main pipe (12), The water supply main pipe (12) is a spiral tube structure. The outer tube wall of the water supply main pipe (12) is connected to a water supply branch pipe (13). The water supply branch pipes (13) are radially distributed on the outer side of the water supply main pipe (12). The water supply branch pipes (13) are provided with water supply holes (16). The water replenishment main pipe (12) is a cylindrical spiral structure, and the inner side of the cylindrical spiral structure is surrounded by a columnar branch pipe cavity (14). The water replenishment branch pipe (13) is located on an end surface of the water replenishment main pipe (12) on a side away from the branch pipe cavity (14); the end of the water replenishment branch pipe (13) away from the branch pipe cavity (14) is a closed structure. A water supply inner tube (15) is rotatably sleeved on the inner side of the water supply branch tube (13); an end of the water supply inner tube (15) close to the water supply main tube (12) is provided with an opening; an end of the water supply inner tube (15) away from the water supply main tube (12) is a closed structure; a driving source (17) is provided at a position between the outer side of the end of the water supply inner tube (15) away from the water supply main tube (12) and the inner side of the end of the water supply branch tube (13) away from the water supply main tube (12); an end of the water supply inner tube (15) away from the water supply main tube (12) is connected to a working end of the driving source (17); and the water supply hole (16) penetrates the tube walls of the water supply branch tube (13) and the water supply inner tube (15). The water replenishment holes (16) are evenly arranged on the walls of the water replenishment branch pipe (13) and the water replenishment inner pipe (15). The water replenishment holes (16) include first through holes respectively provided in the water replenishment branch pipe (13) and second through holes provided in the water replenishment inner pipe (15). When the water replenishment branch pipe (13) is rotated to completely overlap, the first through holes and the second through holes maximize the communication area between the inner cavity of the water replenishment branch pipe (13) and the outer side of the water replenishment inner pipe (15). When the water replenishment branch pipe (13) is rotated to completely separate, the first through holes and the second through holes block the communication between the inner cavity of the water replenishment branch pipe (13) and the outer side of the water replenishment inner pipe (15). The recovery mechanism further comprises a soft water tank (18) whose inlet end is connected to another outlet end of the water collecting tank (1), a second water pump is arranged in the soft water tank (18), and the outlet end of the second water pump is connected to the water supply network of the geothermal source system.

2. A condensate recovery and utilization system for a ground source heat pump system according to claim 1, characterized in that: The infiltration device further comprises a condensation water tank (2) arranged between the water collecting tank (1) and the water outlet pipe, wherein a first water pump is arranged in the condensation water tank (2), the inlet end of the condensation water tank (2) is connected to the outlet end of the water collecting tank (1), and the outlet end of the first water pump is connected to the inlet end of the water outlet pipe.

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