CN106872200A - Cooling tower underground pipe coupling soil radiating experimental system - Google Patents

Abstract

The present invention discloses a kind of cooling tower underground pipe coupling soil radiating experimental system, including attemperater (1), plate type heat exchanger (2), cooling tower (3) and ground heat exchanger (4)；Water inlet (41), the delivery port (42) of ground heat exchanger (4) delivery port (12) respectively with attemperater (1), water inlet (11) are communicated, and water inlet (31), the delivery port (32) of the cooling tower (3) the second delivery port (23) respectively with plate type heat exchanger (2), the second water inlet (24) are communicated；First water inlet (21) of plate type heat exchanger (2) is communicated with the water inlet (11) of attemperater (1), and the first delivery port (22) is communicated with the delivery port (42) of ground heat exchanger (4).Experimental system of the invention, can obtain pipe laying surrounding soil temperature change feature and underground pipe and cooling tower heat dissipation characteristics under different cooling tower underground pipe coupling soil modes.

Description

Cooling tower-buried pipe coupling soil heat dissipation experiment system

technical field

The invention belongs to the technical field of ground-source heat pump air-conditioning test devices, in particular to a cooling tower-ground cooling system that can obtain the characteristics of soil temperature variation around buried pipes and the heat dissipation characteristics of buried pipes and cooling towers under different cooling tower-ground pipe coupling soil modes. Buried pipe coupling soil heat dissipation experiment system.

Background technique

Ground source heat pumps are gradually gaining popularity due to their energy saving and environmental protection properties, and are considered to be one of the most promising heating and air conditioning technologies in the 21st century. However, for areas where cooling is the main supply, the serious imbalance of soil heat and the large initial investment in buried pipes have become the key factors restricting the development and application of ground source heat pumps. For this reason, the cooling tower-assisted composite ground source heat pump system, which uses cooling towers as auxiliary cooling devices to replace part of the buried pipes, can not only effectively alleviate the soil thermal imbalance, but also reduce the investment in buried pipes, and has broad application prospects.

For the cooling tower assisted composite ground source heat pump system, the auxiliary heat dissipation characteristics of the cooling tower and the temperature change and recovery characteristics of the soil around the buried pipe are very important to the performance of the composite system, and different cooling towers - buried pipe coupling soil heat dissipation The way will lead to different heat dissipation performance of the cooling tower and the change law of the soil temperature around the buried pipe. In order to find the best cooling tower-buried pipe coupling soil heat dissipation method to ensure the efficient operation of the composite system, it is necessary to compare various coupling heat dissipation methods through experiments.

However, the existing experimental system can usually only complete a single heat dissipation mode experiment, and cannot obtain the soil temperature change and the heat dissipation characteristics of the cooling tower and buried pipe under different cooling tower-buried pipe coupling soil heat dissipation modes.

Contents of the invention

The object of the present invention is to provide a cooling tower-buried pipe coupling soil heat dissipation experiment system, which can obtain the soil temperature change characteristics around the buried pipe and the heat dissipation characteristics of the buried pipe and cooling tower under different cooling tower-buried pipe coupling soil modes.

The technical solution that realizes the object of the present invention is:

A cooling tower-buried pipe coupling soil heat dissipation experiment system, including a thermal insulation water tank 1, a plate heat exchanger 2, a cooling tower 3 and a buried pipe heat exchanger 4;

The water inlet 41 of the buried pipe heat exchanger 4 communicates with the water outlet 12 of the thermal insulation water tank 1, and the water outlet 42 of the buried pipe heat exchanger 4 communicates with the water inlet 11 of the thermal insulation water tank 1. A third flowmeter 73, a first circulating water pump 61 and a sixth valve 86 are serially connected in series between the water outlet 42 of the device 4 and the water inlet 11 of the thermal insulation water tank 1, and the heat exchange between the water outlet 12 of the thermal insulation water tank 1 and the buried pipe A fourth valve 84 is arranged between the water inlet 41 of the device 4;

The water inlet 31 of the cooling tower 3 communicates with the second water outlet 23 of the plate heat exchanger 2 through the second flowmeter 72, and the water outlet 32 of the cooling tower 3 communicates with the second water outlet 23 of the plate heat exchanger 2 through the second circulating water pump 62. Two water inlets 24 communicate;

The first water inlet 21 of the plate heat exchanger 2 communicates with the water inlet 11 of the thermal insulation water tank 1 through the fifth valve 85 and the sixth valve 86, and the first water inlet 21 of the plate heat exchanger 2 passes through the first flowmeter 71 The first valve 81 communicates with the water outlet 12 of the thermal insulation water tank 1, and the first water outlet 22 of the plate heat exchanger 2 communicates with the water outlet of the buried pipe heat exchanger 4 through the third valve 83 and the third flow meter 73 42, the first water outlet 22 of the plate heat exchanger 2 communicates with the water inlet 41 of the buried pipe heat exchanger 4 through the second valve 82.

Compared with the prior art, the present invention has the remarkable advantages that the characteristics of soil temperature variation around buried pipes and the heat dissipation characteristics of buried pipes and cooling towers can be obtained under different cooling tower-buried pipe coupling soil modes.

1. Through the flexible adjustment of the valve, the temperature dynamic change characteristics of the soil around the buried pipe heat exchanger and the heat dissipation characteristics of the cooling tower and the buried pipe can be completed under different cooling tower-buried pipe coupling soil heat dissipation modes;

2. Through the setting of the water temperature of the heat preservation water tank, the coupling heat dissipation characteristics between the cooling tower and the buried pipe can be obtained under different outlet water temperatures, which can provide a basis for the optimal design and operation of the actual system;

3. By setting the opening conditions of the cooling tower, the experiment of the recovery characteristics of the cooling tower's heat dissipation on the underground soil temperature under continuous operation, intermittent operation and different outdoor environments can be completed;

4. Since the heat preservation water tank with electric heater is used instead of the water source heat pump unit, the system structure is simple, the cost is low, the control and adjustment are convenient, and the experimental functions are diversified.

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Description of drawings

Fig. 1 is a schematic structural diagram of a cooling tower-buried pipe coupling soil heat dissipation experiment system of the present invention.

In the figure, thermal insulation water tank 1, plate heat exchanger 2, cooling tower 3, buried pipe heat exchanger 4, data acquisition instrument 5, first circulating water pump 61, second circulating water pump 62, first flowmeter 71, second Flow meter 72, third flow meter 73, first valve 81, second valve 82, third valve 83, fourth valve 84, fifth valve 85, sixth valve 86, electric heater 9, temperature probe 10, signal transmission line 11.

detailed description

A cooling tower-buried pipe coupling soil heat dissipation experiment system, including a thermal insulation water tank 1, a plate heat exchanger 2, a cooling tower 3 and a buried pipe heat exchanger 4;

The water inlet 41 of the buried pipe heat exchanger 4 communicates with the water outlet 12 of the thermal insulation water tank 1, and the water outlet 42 of the buried pipe heat exchanger 4 communicates with the water inlet 11 of the thermal insulation water tank 1. A third flowmeter 73, a first circulating water pump 61 and a sixth valve 86 are serially connected in series between the water outlet 42 of the device 4 and the water inlet 11 of the thermal insulation water tank 1, and the heat exchange between the water outlet 12 of the thermal insulation water tank 1 and the buried pipe A fourth valve 84 is arranged between the water inlet 41 of the device 4;

The water inlet 31 of the cooling tower 3 communicates with the second water outlet 23 of the plate heat exchanger 2 through the second flowmeter 72, and the water outlet 32 of the cooling tower 3 communicates with the second water outlet 23 of the plate heat exchanger 2 through the second circulating water pump 62. Two water inlets 24 communicate;

The first water inlet 21 of the plate heat exchanger 2 communicates with the water inlet 11 of the thermal insulation water tank 1 through the fifth valve 85 and the sixth valve 86, and the first water inlet 21 of the plate heat exchanger 2 passes through the first flowmeter 71 The first valve 81 communicates with the water outlet 12 of the thermal insulation water tank 1, and the first water outlet 22 of the plate heat exchanger 2 communicates with the water outlet of the buried pipe heat exchanger 4 through the third valve 83 and the third flow meter 73 42, the first water outlet 22 of the plate heat exchanger 2 communicates with the water inlet 41 of the buried pipe heat exchanger 4 through the second valve 82.

An electric heater 9 is provided in the heat-retaining water tank 1 .

Also includes a data acquisition instrument 5 and a plurality of temperature probes 10, the plurality of temperature probes 10 are electrically connected to the data acquisition instrument 5 through a signal transmission line 11;

The plurality of temperature probes 10 are respectively arranged at the water inlets and outlets 11, 12 of the thermal insulation water tank 1, the water inlets and outlets 21, 22, 23, 24 of the plate heat exchanger 22, the water inlets and outlets 31, 32 of the cooling tower 3, and the buried pipe heat exchange Water inlet and outlet 41,42 of device 4.

A temperature probe 10 electrically connected to the data acquisition instrument 5 is also provided at different depths and radii of the soil around the buried tube heat exchanger 4 .

The invention can conveniently work in multiple modes to obtain the temperature change characteristics of the soil around the buried pipe and the heat dissipation characteristics of the buried pipe and the cooling tower under different cooling tower-ground buried pipe coupling soil modes.

1. When running in the cooling tower-buried pipe series coupling heat dissipation mode, turn on the electric heating 9, circulating water pump 61, circulating water pump 62, open the first valve 81, the second valve 82, and the sixth valve 86, and close other valves; cooling The tower is connected in series with the buried tube heat exchanger through the plate heat exchanger, that is, the hot water from the heat preservation water tank first passes through the plate heat exchanger to dissipate heat through the cooling tower, then enters the buried pipe heat exchanger to dissipate heat, and then returns to the heat preservation water tank.

2. When running in the cooling tower-buried pipe parallel coupling cooling mode, turn on the electric heating 9, circulating water pump 61, circulating water pump 62, open the first valve 81, the third valve 83, the fourth valve 84, and the sixth valve 86, The other valves are closed; the cooling tower is connected in parallel with the buried pipe heat exchanger through the plate heat exchanger, that is, the hot water from the heat preservation water tank passes through the plate heat exchanger at the same time to dissipate heat through the cooling tower and the buried pipe heat exchanger, and then returns to to the insulation tank.

3. When operating in cooling tower heat release mode at night, when using buried pipes for cooling operation during the day: turn on the electric heater 9, the first circulating water pump 6-1, open the fourth valve 84, and the sixth valve 86, and close other valves ; When using the cooling tower to release heat at night: turn on the first circulating water pump 61 and the first circulating water pump 62, open the second valve 82 and the fifth valve 85, and close the other valves; use the buried pipe heat exchanger to dissipate heat during the day, At night, the cooling tower forms a series connection circuit through the plate heat exchanger and the buried pipe heat exchanger, and uses the cooling tower to release the heat dissipated into the soil by the buried pipe heat exchanger during the day to the air, so that the soil around the buried pipe temperature to recover as soon as possible.

Claims (7)

1. a kind of cooling tower-underground pipe couples soil radiating experimental system, it is characterised in that：

Including attemperater (1), plate type heat exchanger (2), cooling tower (3) and ground heat exchanger (4)；

The water inlet (41) of the ground heat exchanger (4) is communicated with the delivery port (12) of attemperater (1), ground heat exchanger (4) delivery port (42) is communicated with the water inlet (11) of attemperater (1), ground heat exchanger (4) delivery port (42) with The 3rd flowmeter (73), first circulation water pump (61) and the 6th valve have been sequentially connected in series between the water inlet (11) of attemperater (1) Door (86), the 4th valve is provided between the delivery port (12) of attemperater (1) and the water inlet (41) of ground heat exchanger (4) (84)；

The water inlet (31) of the cooling tower (3) is by second flowmeter (72) and the second delivery port of plate type heat exchanger (2) (23) communicate, the delivery port (32) of cooling tower (3) is by second circulation water pump (62) and the second water inlet of plate type heat exchanger (2) (24) communicate；

First water inlet (21) of the plate type heat exchanger (2) is by the 5th valve (85) and the 6th valve (86) and attemperater (1) water inlet (11) is communicated, and first water inlet (21) of plate type heat exchanger (2) is by first flowmeter (71) and the first valve (81) communicated with the delivery port (12) of attemperater (1), first delivery port (22) of the plate type heat exchanger (2) is by the 3rd valve Door (83) and the 3rd flowmeter (73) are communicated with the delivery port (42) of ground heat exchanger (4), and the first of plate type heat exchanger (2) goes out The mouth of a river (22) is communicated by the second valve (82) with the water inlet (41) of ground heat exchanger (4).

2. experimental system according to claim 1, it is characterised in that：

Electric heater (9) is provided with the attemperater (1).

3. experimental system according to claim 2, it is characterised in that：

Also include data collecting instrument (5) and multiple temp probes (10), the multiple temp probe (10) is by signal transmssion line (11) electrically connected with data collecting instrument (5)；

The multiple temp probe (10) is respectively arranged at intake-outlet (11,12), the plate type heat exchanger (2) 2 of attemperater (1) The intake-outlet (31,32) and the intake-outlet of ground heat exchanger (4) of intake-outlet (21,22,23,24), cooling tower (3) (41、42)。

4. experimental system according to claim 3, it is characterised in that：In the ground heat exchanger (4) surrounding soil not With depth and the temp probe (10) for also being provided with being electrically connected with data collecting instrument (5) at radius.

5. experimental system according to claim 4, it is characterised in that：Operate in cooling tower-underground pipe series coupled radiating During pattern, electrical heating (9), water circulating pump (61), water circulating pump (62), the first valve (81), the second valve (82), the 6th are opened Valve (86) is opened, other valve closings；Cooling tower is made up of with ground heat exchanger plate type heat exchanger and is connected in series, that is, protect Reservoir hot water out is first passed through plate type heat exchanger and is radiated by cooling tower, and guarantor is returned to after entering back into ground heat exchanger radiating Reservoir.

6. experimental system according to claim 4, it is characterised in that：Operate in cooling tower-underground pipe parallel coupled radiating During pattern, electrical heating (9), water circulating pump (61), water circulating pump (62), the first valve (81), the 3rd valve (83), the 4th are opened Valve (84), the 6th valve (86) are opened, other valve closings；Cooling tower is made up of plate type heat exchanger with ground heat exchanger It is connected in parallel, i.e., attemperater hot water out is radiated by plate type heat exchanger by cooling tower simultaneously and ground heat exchanger dissipates Heat, is then return to attemperater.

7. experimental system according to claim 4, it is characterised in that：Night cooling tower heat release pattern is operated in, in the daytime profit When radiating operation is carried out with underground pipe：Opening electric heater (9), first circulation water pump (61), the 4th valve (84), the 6th valve (86) open, other valve closings；When night is run using cooling tower heat release：Open first circulation water pump (61), second circulation Water pump (62), the second valve (82), the 5th valve (85) are opened, other valve closings；In the daytime carried out using ground heat exchanger Radiating, night cooling tower constitutes series-connected loop by plate type heat exchanger with ground heat exchanger, will in the daytime using cooling tower The heat that ground heat exchanger is dissipated in soil is discharged into air, so that the temperature of underground pipe surrounding soil is recovered as early as possible.