Layered testing method and instrument for thermophysical parameters

Abstract

The invention discloses a thermophysical parameter layering test method and apparatus, the apparatus comprises a protection box, the protection box is internally provided with a test cabinet, the test cabinet is internally provided with a heating cavity, a refrigeration cavity, a heat adjusting pipe and an electrical element, the heating cavity and the refrigeration cavity are connected through the heat adjusting pipe, and the electrical element is connected with and controls the heat adjusting pipe; three modes of frequency domain analysis, constant temperature control and constant power control are combined by regulating and controlling the heat regulating tube. According to the invention, flexible access and arrangement in a narrow or construction environment can be realized, multi-dimensional thermal response testing of the energy underground structure can be realized, and effective distinguishing of heat exchange performance of different heat exchange depths can be realized.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of thermal response test, and particularly relates to a thermal physical parameter layered test method and instrument. BACKGROUND

[0002] The existing buried pipe thermal response test is mostly carried out on the ground, and the test equipment is relatively large in size, and is convenient to install and operate. However, the thermal response test of energy underground structures (such as comprehensive pipe galleries, tunnels, etc.) is mostly in narrow or construction environments, and the traditional equipment is relatively large in size, and is difficult to move, install and maintain, which easily affects the continuity and reliability of the test. For energy piles, energy side walls and other structures, the process of arranging temperature sensors along the depth direction of the heat exchange pipe is complicated, which limits the construction efficiency and test effect.

[0003] For energy piles, energy side walls and other energy underground structures, small heat exchange pipe depth represents shallow stratum, and large heat exchange pipe depth represents deep stratum; and for energy floors, energy tunnels and other energy underground structures, small heat exchange pipe depth represents small pipe area, and large heat exchange pipe depth represents large pipe area. However, the existing technology cannot meet the requirements of on-site construction and performance discrimination. SUMMARY

[0004] The present application aims to provide a thermal physical parameter layered test method and instrument, which can be flexibly put in and out and arranged in narrow or construction environments, can realize multi-dimensional thermal response test of energy underground structures, and can effectively distinguish the heat exchange performance of different heat exchange depths.

[0005] To achieve the above-mentioned purpose, the present application provides a thermal physical parameter layered test instrument, which comprises a protection box, a test machine box is installed in the protection box, a heating cavity, a refrigeration cavity, a heat regulating pipe and electrical elements are installed in the test machine box, the heating cavity and the refrigeration cavity are connected through the heat regulating pipe, and the electrical elements are connected to control the heat regulating pipe.

[0006] As a further scheme of the present application, the heat regulating pipe comprises a pipe segment A for connecting a water supply port on the test machine box and a pipe segment K for connecting a backwater port on the test machine box; The pipe segment A is connected to a plurality of parallelly arranged water pumps, the other end of the water pumps is connected to a plurality of parallelly arranged electromagnetic valves A and electromagnetic valves B through a pipe segment B, the other end of the electromagnetic valve A is connected to an electromagnetic valve C, the other end of the electromagnetic valve B is connected to a plurality of water tanks in sequence and then connected to an electromagnetic valve D, the electromagnetic valve C and the electromagnetic valve D are jointly connected to a flow meter, the other end of the flow meter is connected to a plurality of parallelly arranged electromagnetic valves E and electromagnetic valves H; The pipe segment K is connected to a plurality of parallelly arranged electromagnetic valves F and electromagnetic valves G, the electromagnetic valves E and the electromagnetic valves F are connected to the heating cavity through a temperature sensor A, the electromagnetic valves G and the electromagnetic valves H are connected to the refrigeration cavity through a temperature sensor D, and the heating cavity is connected to the refrigeration cavity through a temperature sensor B and a temperature sensor C in sequence.

[0007] As a further aspect of the present invention: the heating cavity includes a heating cavity isolation shell, and a heating cavity heat sink is installed at the top center of the heating cavity isolation shell.

[0008] As a further aspect of the present invention: a multi-layered stacked heating assembly is installed inside the heating chamber isolation shell, the heating assembly including a heating plate and a heat exchange plate connected below the heating plate.

[0009] As a further aspect of the present invention: the cooling cavity includes a cooling cavity isolation shell, a cooling cavity radiator is installed at the top center of the cooling cavity isolation shell, and multiple layers of symmetrical cooling components are installed inside the cooling cavity isolation shell.

[0010] As a further aspect of the present invention: the refrigeration assembly includes a refrigeration plate and a heat exchange plate connected to the cold end of the outer side of the refrigeration plate, and heat dissipation fins connected to the hot end of the inner side of the refrigeration plate.

[0011] As a further aspect of the present invention: the electrical components include a heat sink, a power supply, a switching power supply, a relay, a water pump frequency converter, a frequency converter operation panel, a temperature controller, a PLC controller, and a display. The power supply is connected to the switching power supply, relay, water pump inverter, and water pump; the switching power supply is connected to the temperature controller, PLC controller, display, and radiator; the inverter operation panel is connected to the water pump inverter.

[0012] As a further embodiment of the present invention: the protective box includes a protective box body, and the two ends of the protective box body are connected to a front cover and a rear cover by protective box screws. The surface of the protective box body is provided with openings corresponding to the heating chamber, the cooling chamber and the electrical components.

[0013] As a further aspect of the present invention: the test chassis includes a test chassis body, a chassis cover is connected to the top of the test chassis body by chassis screws, and slide rails for connecting a protective box are provided on both sides of the test chassis body.

[0014] To achieve the above objectives, the present invention also provides a method for stratified testing of thermophysical parameters, based on the aforementioned thermophysical parameter stratified testing instrument, comprising the following steps: S1. Install test heat exchange tubes in the selected underground energy structure area and set the length of the heat exchange tubes. L ; S2. Use testing instruments to perform phase calibration on the heat exchange tubes to obtain the critical frequency of water supply temperature fluctuation. f c ; S3. Use testing instruments to calibrate the amplitude of the heat exchange tubes to obtain the critical amplitude of the water supply temperature fluctuation. A c ; S4. Under constant temperature control mode, restore the temperature in the heat exchange tubes to the initial soil temperature. Tsoil ; S5, the water supply temperature fluctuation critical frequency obtained according to S2 and S3 f c and the water supply temperature fluctuation critical amplitude A c output test water supply temperature fluctuation, and judge the size relationship between the return water temperature fluctuation frequency and the water supply temperature fluctuation critical frequency f c ; S6, determine the current heat exchange pipe length according to the judgment result of S5 L Whether appropriate, if not, the heat exchange pipe length needs to be changed L After that, start the cycle iteration from S1 again.

[0015] Compared with the prior art, the beneficial effects of the present application are as follows: 1. The internal structure of the test instrument is compact, the overall volume of the test instrument is small, it can be flexibly in and out and arranged in narrow or construction environment, avoiding the inconvenience of traditional large test instrument in handling, installation and maintenance, effectively improving the continuity and reliability of the test.

[0016] 2. The heat regulating pipe controlled by the electrical element can realize three modes of frequency domain analysis, constant temperature control and constant power control, and realize multi-dimensional thermal response test of energy underground structure. Unlike the common borehole buried pipe temperature measurement method, the present application does not need to arrange temperature sensors along the depth direction of the heat exchange pipe, but can judge the appropriate length of the heat exchange pipe through the supply and return water temperature waveform characteristics, simplifying the test process and avoiding the complexity of sensor arrangement in different types of energy underground structure.

[0017] 3. The present application utilizes the strong homogeneity of concrete in energy underground structure, realizes effective differentiation of heat exchange performance of different heat exchange depth by analyzing the frequency domain difference of supply and return water temperature waveform; in energy pile and energy side wall, smaller heat exchange pipe depth corresponds to shallow stratum, larger heat exchange pipe depth corresponds to deep stratum; in energy floor and energy tunnel, smaller heat exchange pipe depth corresponds to smaller pipe area, larger heat exchange pipe depth corresponds to larger pipe area. Therefore, the present application can flexibly judge the rationality of heat exchange pipe arrangement length in various types of energy underground structure. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural schematic diagram of the heat physical property parameter layered test instrument of the present application.

[0019] Figure 2 is a test machine box structure schematic diagram of the heat physical property parameter layered test instrument of the present application.

[0020] Figure 3It is the internal structure schematic view of test case of the layered testing instrument of thermal physical parameter of the application.

[0021] Figure 4 It is the connection structure schematic view of thermal regulation pipe of the layered testing instrument of thermal physical parameter of the application.

[0022] Figure 5 It is the connection structure overhead view of thermal regulation pipe of the layered testing instrument of thermal physical parameter of the application.

[0023] Figure 6 It is the connection principle view of thermal regulation pipe of the layered testing instrument of thermal physical parameter of the application.

[0024] Figure 7 It is the structure schematic view of heating cavity of the layered testing instrument of thermal physical parameter of the application.

[0025] Figure 8 It is the structure schematic view of refrigeration cavity of the layered testing instrument of thermal physical parameter of the application.

[0026] Figure 9 It is the structure schematic view of heat exchange flow channel of the layered testing instrument of thermal physical parameter of the application.

[0027] In the figure: 1, protective box, 2, test case, 3, thermal regulation pipe, 4, heating cavity, 5, refrigeration cavity, 6, electrical element, 7, protective box front cover, 8, protective box body, 9, protective box rear cover, 10, protective box screw, 11, test case body, 12, slide rail, 13, case upper cover, 14, case screw; 15, pipe section A, 16, pipe section B, 17, pipe section C, 18, pipe section D, 19, pipe section E, 20, pipe section F, 21, pipe section G, 22, pipe section H, 23, pipe section I, 24, pipe section J, 25, pipe section K; 26, water tank A, 27, water tank B, 28, electromagnetic valve A, 29, electromagnetic valve B, 30, electromagnetic valve C, 31, electromagnetic valve D, 32, electromagnetic valve E, 33, electromagnetic valve F, 34, electromagnetic valve G, 35, electromagnetic valve H, 36, flowmeter, 37, temperature sensor A, 38, temperature sensor B, 39, temperature sensor C, 40, temperature sensor D; 41, heating cavity isolation shell, 42, heating cavity radiator, 43, protective plate, 44, heating plate, 45, heat exchange plate, 46, heat exchange flow channel, 47, refrigeration cavity isolation shell, 48, refrigeration cavity radiator, 49, refrigeration plate, 50, hot end heat dissipation fin, 51, dust screen, 52, radiator, 53, power supply, 54, switching power supply, 55, relay, 56, water pump frequency converter, 57, water pump A, 58, water pump B, 59, frequency converter operation panel, 60, temperature controller, 61, PLC controller, 62, display. DETAILED DESCRIPTION

[0028] The invention will now be further described with reference to the accompanying drawings.

[0029] like Figure 1 As shown, a thermophysical parameter stratification testing instrument includes a protective box 1, a testing chamber 2 installed inside the protective box 1, a heating chamber 3, a cooling chamber 4, a heat regulating pipe 3 and an electrical component 6 installed inside the testing chamber 2, the heating chamber 3 and the cooling chamber 4 are connected through the heat regulating pipe 3, and the electrical component 6 is connected to control the heat regulating pipe 3; like Figures 4 to 6 As shown, the heat regulation pipe 3 includes pipe section A15 for connecting to the water supply port on the test chamber 2 and pipe section K25 for connecting to the water return port on the test chamber 2. Pipe section A15 connects several water pumps arranged in parallel. The other end of the water pump is connected to solenoid valves A28 and B29 arranged in parallel through pipe section B16. The other end of solenoid valve A28 is connected to solenoid valve C30. The other end of solenoid valve B29 is connected to several water tanks in sequence and then connected to solenoid valve D31. Solenoid valves C30 and D31 are connected to flow meter 36. The other end of flow meter 36 is connected to solenoid valves E32 and H35 arranged in parallel. Pipe section K25 connects to solenoid valves F33 and G34, which are set in parallel. Solenoid valves E32 and F33 are connected to heating chamber 3 through temperature sensor A37. Solenoid valves G34 and H35 are connected to cooling chamber 4 through temperature sensor D40. Heating chamber 3 is connected to cooling chamber 4 in sequence through temperature sensor B38 and temperature sensor C39.

[0030] Preferably, the water pumps include water pump A57 and water pump B58 connected in parallel, and the water tanks include water tank A26 and water tank B27 connected in parallel. Specific connection methods are as follows: Figures 4-6As shown, the water supply port on the test case body 11 is connected to the water pump A 57 and the water pump B 58 through the pipe section A 15, and then connected to the electromagnetic valve A 28 and the electromagnetic valve B 29 through the pipe section B 16; the electromagnetic valve A 28 is connected to the electromagnetic valve C 30 through the pipe section C 17, forming the pipeline when the frequency domain analysis or constant power control is performed; the electromagnetic valve B 29 is connected to the water tank A 26 through the pipe section D 18, the water tank A 26 is connected to the water tank B 27 through the pipe section E 19, and the water tank B 27 is connected to the electromagnetic valve D 31 through the pipe section F 20, forming the buffer water tank pipeline when the constant temperature control is performed; the electromagnetic valve C 30 and the electromagnetic valve D 31 are connected to the flow meter 36 through the pipe section G 21; the flow meter 36 is connected to the electromagnetic valve E 32 and the electromagnetic valve H 35 through the pipe section H 22; the electromagnetic valve E 32 and the electromagnetic valve F 33 are connected to the heating cavity 3 through the temperature sensor A 37; the heating cavity 3 is connected to the refrigeration cavity 4 through the temperature sensor B 38 and the temperature sensor C 39; the refrigeration cavity 4 is connected to the electromagnetic valve G 34 and the electromagnetic valve H 35 through the temperature sensor D 40 and the pipe section J 24; the electromagnetic valve F 33 and the electromagnetic valve G 34 are connected to the water return port on the test case body 11 through the pipe section K 25.

[0031] Among them, the pipe section A 15, the water pump A 57 and the water pump B 58, the pipe section B 16, the electromagnetic valve A 28, the pipe section C 17, the electromagnetic valve C 30, the pipe section G 21, the flow meter 36, the pipe section H 22, the electromagnetic valve E 32, the pipe section I 23, the temperature sensor A 37, the heating cavity 3, the temperature sensor B 38, the temperature sensor C 39, the refrigeration cavity 4, the temperature sensor D 40, the electromagnetic valve G 34, the pipe section H 22 and the pipe section K 25 constitute the heating working condition heat regulating pipe 3 when the frequency domain analysis and constant power control are performed.

[0032] The pipe section A 15, the water pump A 57 and the water pump B 58, the pipe section B 16, the electromagnetic valve A 28, the pipe section C 17, the electromagnetic valve C 30, the pipe section G 21, the flow meter 36, the pipe section H 22, the electromagnetic valve H 35, the pipe section J 24, the temperature sensor D 40, the refrigeration cavity 4, the temperature sensor C 39, the temperature sensor B 38, the heating cavity 3, the temperature sensor A 37, the pipe section I 23, the electromagnetic valve F 33, the pipe section H 22 and the pipe section K 25 constitute the refrigeration working condition heat regulating pipe 3 when the frequency domain analysis and constant power control are performed.

[0033] The pipe section A 15, the water pump A 57 and the water pump B 58, the pipe section B 16, the electromagnetic valve B 29, the pipe section D 18, the water tank A 26, the pipe section E 19, the water tank B 27, the pipe section F 20, the electromagnetic valve D 31, the pipe section G 21, the flow meter 36, the pipe section H 22, the electromagnetic valve E 32, the pipe section I 23, the temperature sensor A 37, the heating cavity 3, the temperature sensor B 38, the temperature sensor C 39, the refrigeration cavity 4, the temperature sensor D 40, the electromagnetic valve G 34, the pipe section H 22 and the pipe section K 25 constitute the heating working condition heat regulating pipe 3 when the constant temperature control is performed.

[0034] Pipe segment A 15, water pump A 57 and water pump B 58, pipe segment B 16, electromagnetic valve B 29, pipe segment D 18, water tank A 26, pipe segment E 19, water tank B 27, pipe segment F 20, electromagnetic valve D 31, pipe segment G 21, flow meter 36, pipe segment H 22, electromagnetic valve H 35, pipe segment J 24, temperature sensor D 40, refrigeration cavity 4, temperature sensor C 39, temperature sensor B 38, heating cavity 3, temperature sensor A 37, pipe segment I 23, electromagnetic valve F 33, pipe segment H 22 and pipe segment K 25 constitute the refrigeration working condition of the constant temperature control time heat regulating pipe 3.

[0035] Further, as shown in Figure 3 and Figure 7 , the heating cavity 3 includes a heating cavity isolation shell 41, a heating cavity radiator 42 is installed at the top center of the heating cavity isolation shell 41, and a plurality of layers of stacked heating components are installed in the heating cavity isolation shell 41, the heating components include a heating plate 44 and a heat exchange plate 45 connected below the heating plate 44. Preferably, as shown in Figure 7 , the heating component is provided with two groups.

[0036] Further, as shown in Figure 3 and Figure 8 , the refrigeration cavity 4 includes a refrigeration cavity isolation shell 47, a refrigeration cavity radiator 48 is installed at the top center of the refrigeration cavity isolation shell 47, and a plurality of layers of symmetric refrigeration components are installed in the refrigeration cavity isolation shell 47, the refrigeration components include a refrigeration plate 49 and a heat exchange plate 45 connected to the cold end of the outer side of the refrigeration plate 49, and a hot end heat dissipation fin 50 connected to the hot end of the inner side of the refrigeration plate 49. Preferably, as shown in Figure 8 , the refrigeration component is provided with two groups.

[0037] The heat exchange plate 45 in the heating cavity 3 and the refrigeration cavity 4 has the same structure, and the heat exchange plate 45 is provided with an S-shaped heat exchange flow channel 46, which improves the heat exchange effect of the heating cavity 3 and the refrigeration cavity 4.

[0038] In order to realize the adjustment and control of the heat regulating pipe 3, further, as shown in Figure 3 , the electrical element 6 includes a radiator 52, a power supply 53, a switching power supply 54, a relay 55, a water pump frequency converter 56, a frequency converter operation panel 59, a temperature controller 60, a PLC controller 61 and a display 62; The power supply 53 is connected with the switching power supply 54, the relay 55, the water pump frequency converter 56 and the water pump; the switching power supply 54 is connected with the temperature controller 60, the PLC controller 61, the display 62 and the radiator 52; the frequency converter operation panel 59 is connected with the water pump frequency converter 56.

[0039] Further, as shown in Figure 1As shown, the protective box 1 includes a protective box body 8, and the protective box body 8 is connected with a protective box front cover 7 and a protective box rear cover 9 at both ends through protective box screws 10. The protective box body 8 is provided with openings corresponding to the heating cavity 3, the refrigeration cavity 4 and the electrical element 6.

[0040] Further, as shown in the figure, Figure 2 The test case 2 includes a test case body 11, and the test case body 11 is connected with a case upper cover 13 above through a case screw 14. The test case body 11 is provided with slide rails 12 for connecting the protective box 1 on the side surfaces. Through the slide rails 12, the test case 2 can be pulled out from the protective box 1 when the protective box front cover 7 or the rear cover is opened, which is convenient for maintenance and maintenance. The test case 2 is provided with a dust screen 51 corresponding to the heat dissipation, which can ensure the cleanliness of the test case 2 and avoid the influence of dust on the working effect of the electrical element 6.

[0041] A thermal physical parameter layering test method based on the above thermal physical parameter layering test instrument, comprising the following steps: S1: arranging test heat exchange pipes in a selected underground energy structure area, and setting the length of the arranged heat exchange pipes as L .

[0042] S2: using the test instrument to calibrate the phase of the heat exchange pipes, and fixing the amplitude of the water supply temperature waveform A 0 , A 0 The average value of the constant water supply temperature commonly used by buildings in the region and the initial temperature of the soil can be selected. T soil

[0043] If t The frequency of water supply temperature fluctuation at this moment is f n At this time, the water supply temperature fluctuation T in ( t ) is: ; The return water temperature fluctuation T in ( t ) corresponding to the water supply temperature fluctuation T out ( t ) is: ; Wherein, B 0 is the amplitude of the return water temperature waveform, f' n is the frequency of the return water temperature fluctuation, and the frequency of the water supply temperature fluctuation f n is different in size,​ф n The phase lag of the return water temperature waveform. Since it takes a certain amount of time for the water to flow from the inlet to the outlet, the temperature fluctuation measured at the outlet will have a phase lag relative to the inlet. However, the exact value of this phase lag has little effect on the present application, so its exact size can be ignored in the test.

[0044] If the frequency of the supply water temperature fluctuation becomes f n+1 , and f n > f n+1 At this time, the supply water temperature fluctuation T in ( t ) is: ; The return water temperature fluctuation T in ( t ) corresponding to the supply water temperature fluctuation T out ( t ) is: ; Where, f' n+1 is the frequency of the return water temperature fluctuation, which is different from the frequency of the supply water temperature fluctuation f n+1 .

[0045] If the above relationship is satisfied, it means that the critical frequency of the borehole is: ; Through phase calibration, a critical frequency f c is obtained, so that at this frequency, the measured return water temperature fluctuation just meets the threshold value of 0.1℃, at which time the return water temperature fluctuation can just be measured, and the frequency of the supply water temperature fluctuation at this time is the critical frequency of the supply water temperature fluctuation f c .

[0046] S3: Use the test instrument to calibrate the amplitude of the heat exchange pipe, and fix the frequency of the supply water temperature waveform as f 0 , f 0 Select half of the critical frequency of the supply water temperature fluctuation obtained in S2 f c .

[0047] If t at this time, the amplitude of the supply water temperature fluctuation is A n , at which time the supply water temperature fluctuation Tin t T in t T out t f f B n

[0048] A n+1 A n+1 A n T in t T in t T out t B n+1

[0049] A c A c

[0050] S4: through the constant temperature control mode of the test instrument, the temperature in the heat exchange pipe is restored to the initial temperature of the soil T soil , the measured temperatures of the temperature sensor A 37, the temperature sensor B 38, the temperature sensor C 39 and the temperature sensor D 40 are​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​T 1 、 T 2 、 T 3 and T 4 The distance between two adjacent sensors is L 1 、 L 2 and L 3 .

[0051] For heating mode, if the test instrument is started at T soil > T 1 ( t ), the set power of heating cavity 3 Q h and the set power of refrigeration cavity 4 Q c are as follows: ; ; wherein, Q h ( t ) is the set refrigeration power at the current time step, Q h ( t +1) is the set refrigeration power at the next time step, Q c ( t ) is the set refrigeration power at the current time step, Q c ( t +1) is the set refrigeration power at the next time step, m is the mass flow rate of water, c p is the specific heat capacity of water.

[0052] For heating mode, if the test instrument is started at T soil = T 1 ( t ), the set power of heating cavity 3 Q h and the set power of refrigeration cavity 4 Q c are as follows: ; ; For heating mode, if the test instrument is started at T soil < T 1 ​t ), then Q h and Q c is: ; ; For refrigeration working condition, the corresponding relationship of temperature judgment and power change is the same as that of heating working condition, only need to change the measurement point from T 1 to T 4 .

[0053] S5: use the test instrument to test the heat exchange pipe, the frequency of water supply temperature fluctuation is the critical frequency of water supply temperature fluctuation f c , the amplitude of water supply temperature fluctuation is the critical amplitude of water supply temperature fluctuation A c , the specific form is: ; The first period of water return temperature fluctuation monitored at the water return position T out ( t ) is: ; Wherein, A m is the amplitude of water return temperature fluctuation, ф m is the delay phase.

[0054] Judge the size relationship between the frequency of water return temperature fluctuation f m and the frequency of water supply temperature fluctuation f n .

[0055] S6, determine whether the current heat exchange pipe length L is appropriate according to the judgment result of S5: If f m < f n , it means that the heat exchange performance of small heat exchange pipe depth is much smaller than that of large heat exchange pipe depth, and the heat exchange pipe with length of 2 L is re-arranged, and the test starts from S1 again.

[0056] If f m ≈ f n , it means that the heat exchange performance of small heat exchange pipe depth is greater than or equal to that of large heat exchange pipe depth, at this time it can be considered that the current heat exchange pipe length L satisfies the requirement, if the heat exchange pipe lengthL Still large, also can re-arrange the length of the heat exchange pipe, re-test from S1. L

[0057] In the test process, the heat exchange capacity of the borehole in the test time under heating and refrigeration conditions is respectively: Among them Q h Qh is the heat exchange capacity under heating condition, Q c Qc is the heat exchange capacity under refrigeration condition.

[0058] In addition, the test instrument in the application also has a constant power control mode, and the specific control principle is: For heating condition, the temperature data of T 1 , T 3 and T 4 are measured.

[0059] The equivalent heating power Q hd ( t ) is: Among them, ρ is the density of circulating water, cp is the specific heat capacity of water, v is the flow rate of circulating water, which is measured by flow meter 36, A is the flow cross-sectional area of the heat exchange pipe, that is, the cross-sectional area corresponding to the inner diameter of the heat exchange pipe.

[0060] The flow time of circulating water from measuring point T 1 to measuring point T 3 is: Judge the size relationship between the heating power set by heating cavity 3 under constant power control Q hset and the equivalent heating power Q hd ( t ).

[0061] If Q hd ( t ) Q hset , the set power of heating cavity 3 and refrigeration cavity 4 is changed to: If Q ​​​​​​​hd t Q hset Q hd t Q hset For refrigeration mode, measure the temperature data of T 1 T 2 and T 4

[0062] The equivalent refrigeration power is: The flow time of the circulating water from measuring point T 4 to measuring point T 2 Determine the size relationship between the set refrigeration power Q cset of the refrigeration cavity 4 under constant power control and the equivalent refrigeration power Q cd t

[0063] If Q cd t > Q cset , the set powers of the heating cavity 3 and the refrigeration cavity 4 are changed to: If Q cd t = Q cset , the set powers of the heating cavity 3 and the refrigeration cavity 4 are changed to: If Q cd t < Q cset , the set powers of the heating cavity 3 and the refrigeration cavity 4 are changed to: ;​​​​​​​​​​​​​​​​​​​​​​​​​​​​ 。

Claims

1. A thermal property parameter layered testing instrument comprising a protection box (1), characterized in that, The protective box (1) is internally provided with a test box (2), the test box (2) is internally provided with a heating cavity (3), a refrigeration cavity (4), a thermal regulation pipe (3) and an electrical element (6), the heating cavity and the refrigeration cavity (4) are connected through the thermal regulation pipe (3), and the electrical element (6) is connected to control the thermal regulation pipe (3).

2. The apparatus according to claim 1, wherein, The thermal regulation pipe (3) comprises a pipe section A (15) for connecting a water supply port on the test box (2) and a pipe section K (25) for connecting a backwater port on the test box (2); The pipe section A (15) is connected to a plurality of parallelly arranged water pumps, the other end of the water pump is connected to parallelly arranged electromagnetic valves A (28) and electromagnetic valves B (29) through a pipe section B (16), the other end of the electromagnetic valve A (28) is connected to an electromagnetic valve C (30), the other end of the electromagnetic valve B (29) is sequentially connected to a plurality of water tanks and then connected to an electromagnetic valve D (31), the electromagnetic valve C (30) and the electromagnetic valve D (31) are jointly connected to a flowmeter (36), the other end of the flowmeter (36) is connected to parallelly arranged electromagnetic valves E (32) and electromagnetic valves H (35); The pipe section K (25) is connected to parallelly arranged electromagnetic valves F (33) and electromagnetic valves G (34), the electromagnetic valves E (32) and the electromagnetic valves F (33) are connected to the heating cavity (3) through a temperature sensor A (37), the electromagnetic valves G (34) and the electromagnetic valves H (35) are connected to the refrigeration cavity (4) through a temperature sensor D (40), and the heating cavity (3) is connected to the refrigeration cavity (4) through a temperature sensor B (38) and a temperature sensor C (39) in sequence.

3. The thermal property parameter layered testing instrument according to claim 2, wherein, The heating cavity (3) comprises a heating cavity isolation shell (41), and a heating cavity radiator (42) is arranged at the top center of the heating cavity isolation shell (41).

4. The apparatus according to claim 3, wherein, The heating cavity isolation shell (41) is internally provided with a plurality of stacked heating assemblies, and the heating assembly comprises a heating plate (44) and a heat exchange plate (45) connected below the heating plate (44).

5. The apparatus according to claim 2, wherein, The refrigeration cavity (4) comprises a refrigeration cavity isolation shell (47), and a refrigeration cavity radiator (48) is arranged at the top center of the refrigeration cavity isolation shell (47).

6. The apparatus according to claim 5, wherein, The refrigeration cavity isolation shell (47) is internally provided with a plurality of symmetrical refrigeration assemblies, and the refrigeration assembly comprises a refrigeration plate (49), a heat exchange plate (45) connected to the cold end of the outer side of the refrigeration plate (49), and a hot end heat dissipation fin (50) connected to the hot end of the inner side of the refrigeration plate (49).

7. The apparatus according to claim 1, wherein, The electrical element (6) comprises a radiator (52), a power supply (53), a switching power supply (54), a relay (55), a water pump frequency converter (56), a frequency converter operation panel (59), a temperature controller (60), a PLC controller (61) and a display (62); The power supply (53) is connected to the switching power supply (54), the relay (55), the water pump frequency converter (56) and the water pump; the switching power supply (54) is connected to the temperature controller (60), the PLC controller (61), the display (62) and the radiator (52); and the frequency converter operation panel (59) is connected to the water pump frequency converter (56).

8. The apparatus according to any one of claims 1-7, wherein, The protection box (1) comprises a protection box body (8), the both ends of the protection box body (8) are connected with a protection box front cover (7) and a protection box rear cover (9) through protection box screws (10), and the surface of the protection box body (8) is provided with openings corresponding to a heating cavity (3), a refrigeration cavity (4) and electrical elements (6).

9. The apparatus according to claim 8, wherein, The test case (2) comprises a test case body (11), the upper portion of the test case body (11) is connected with a case upper cover (13) through case screws (14), and the both sides of the test case body (11) are provided with slide rails (12) for connecting the protection box (1).

10. A method of testing thermal physical parameter layering, characterized in that The thermal property parameter layered test instrument based on any one of claims 1-9 comprises the following steps: S1, laying the test heat exchange pipe in the selected underground structure area of the energy source, and setting the length of the laid heat exchange pipe as L ; S2, using test instrument on heat exchange tube phase calibration, get the critical frequency of water temperature fluctuation f c ; S3, using test instrument to heat exchange tube amplitude calibration, get the critical amplitude of water temperature fluctuation A c ; S4, in the constant temperature control mode, the temperature in the heat exchange pipe is restored to the initial temperature of the soil T soil ; S5, the critical frequency of water supply temperature fluctuation obtained according to S2 and S3 f c and the critical amplitude of water supply temperature fluctuation A c outputting a test water supply temperature fluctuation, and judging the size relationship between the frequency of return water temperature fluctuation and the critical frequency of water supply temperature fluctuation f c ​ S6, determining the current heat exchange tube length according to the result of S5 L whether it is appropriate, if not, then need to change the length of the heat exchange tube L then re-circulation iteration from S1.

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