CN201974395U - Miniaturization high-precision field-testing instrument for thermal conductivity of soil - Google Patents

Abstract

A miniaturization high-precision field-testing instrument for thermal conductivity of soil relates to the technical field of air conditioners. A fifth ball valve is arranged on a thermal insulating water tank; a water collector is communicated with an inlet end of a sixth ball valve; an outlet end of the sixth ball valve is communicated with the thermal insulating water tank; a first temperature sensor is arranged on the water collector; a second temperature sensor is arranged on a water separator; a third temperature sensor is arranged on the thermal insulating water tank; an output end of a flowmeter, an output end of the first temperature sensor, an output end of the second temperature sensor and an output end of the third temperature sensor are connected with an input end of a programmable controller; and the miniaturization high-precision field-testing instrument has a compact structure, high testing precision and wide power testing range, is suitable for field operation and provides a reliable basis for the reasonable design and operational reliability of a soil source heat pump system.

Description

A kind of miniaturization high precision soil coefficient of heat conductivity on-spot tester

Technical field:

The utility model relates to air-conditioning technical field, is specifically related to engineering site soil thermal conductivity tester in a kind of soil source heat pump air conditioner field.

Background technology:

China's city heat supply in winter also mainly relies on coal-fired, oil burning boiler at present, summer cooling mainly is that refrigeration machine adds the cooling tower system, adopt this traditional heating cooling mode not only to make the air environmental pollution in city serious day by day, also aggravated the contradiction of energy supply structure and demand simultaneously.Soil source heat pump be a kind of be the better mode that cold and heat source satisfies cold and heat supply with the earth soil.The soil moisture of certain depths keeps constant in winter, summer, far above the outdoor temperature in winter, is lower than the outdoor temperature in summer again, and it not only overcomes the air bound of air source heat pump, and efficient improves greatly, and has energy-saving and environmental protection, the stable advantage of heat exchange.In soil source heat pump system, ground heat exchanger has decisive influence to the economy and the operational reliability of system, and the hot rerum natura of soil is critical parameter in the design of ground heat exchanger, therefore how accurate, the easy to operate thermal physical property parameter that is fit to the quick measured soil of engineering practical application again, become the economy of decision soil source heat pump system, and then influence engineering key technologies for application and key problem.

In the on-the-spot test technology of the hot rerum natura of existing soil, application number is 200810201626.3, name is called the patent of invention of high precision soil thermophysical nature measurer for ground source heat pump, this tester structural design compactness, conveniently moving, heating power is adjustable in 0-12kW, but this invention can't be tested double-U-shaped pipe laying form; When adopting no line length line source model to calculate hot rerum natura, do not consider the hot-fluid short circuit between arm; When the soil hot rerum natura of research during long-play, though employing has the hot-fluid short circuit of having considered in the existing long line source model between arm, but computation model is comparatively complicated, amount of test data is big, when adopting the inversion algorithm calculation of thermal conductivity, increase computing time greatly, and those skilled in the art can't grasp.

The utility model content:

The purpose of this utility model provides a kind of miniaturization high precision soil coefficient of heat conductivity on-spot tester, its compact conformation, the measuring accuracy height, the measured power scope is wide, be applicable to site work, for the appropriate design and the reliability of operation of soil source heat pump system provides reliable foundation.

In order to solve the existing problem of background technology, the utility model is by the following technical solutions: it comprises attemperater 1, electric heater 2, water collector 3, water trap 4, water circulating pump 5, flowmeter 6, first temperature sensor 7, second temperature sensor 8, three-temperature sensor 9, first ball valve 10, second ball valve 11, the 3rd ball valve 12, the 4th ball valve 13, the 5th ball valve 14, the 6th ball valve 15, the 7th ball valve 16, power supply 17, Programmable Logic Controller 18, liquid crystal touch screen 19, filtrator 20, USB flash disk 21, solid-state relay 22; Filtrator 20 is installed in attemperater 1 and connects on the house steward that, and electric heater 2 is arranged on attemperater 1 inside, and the endpiece of filtrator 20 communicates with the entrance point of water circulating pump 5; The endpiece of water circulating pump 5 communicates with the entrance point of flowmeter 6; The endpiece of flowmeter 6 communicates with the entrance point of the 7th ball valve 16, and the endpiece of the 7th ball valve 16 communicates with water trap 4; First ball valve 10, second ball valve 11 are installed in water collector 3 respectively and connect on two bye-passes, and the 3rd ball valve 12, the 4th ball valve 13 are installed on the bye-pass that two companies of water trap 4 go out; The 5th ball valve 14 is installed on the attemperater 1; Water collector 3 communicates with the entrance point of the 6th ball valve 15, and the endpiece of the 6th ball valve 15 communicates with attemperater 1; First temperature sensor 7 is installed on the water collector 3; Second temperature sensor 8 is installed on the water trap 4; Three-temperature sensor 9 is installed on the attemperater 1; The output terminal of the output terminal of the output terminal of flowmeter 6, first temperature sensor 7, second temperature sensor 8, the output terminal of three-temperature sensor 9 all link to each other with the input end of Programmable Logic Controller 18, the output terminal of Programmable Logic Controller 18 links to each other with input end, the control short circuit current of power supply 17, the solid-state relay 22 of liquid crystal touch screen 19 respectively, solid-state relay 22 links to each other with electric heater 2, and liquid crystal touch screen 19 links to each other with USB flash disk 21.

The utlity model has following beneficial effect: compact conformation, the measuring accuracy height, the measured power scope is wide, is applicable to site work, for the appropriate design and the reliability of operation of soil source heat pump system provides reliable foundation.

Description of drawings:

Fig. 1 is a structural representation of the present utility model.

Embodiment:

Referring to Fig. 1, this embodiment by the following technical solutions: it comprises attemperater 1, electric heater 2, water collector 3, water trap 4, water circulating pump 5, flowmeter 6, first temperature sensor 7, second temperature sensor 8, three-temperature sensor 9, first ball valve 10, second ball valve 11, the 3rd ball valve 12, the 4th ball valve 13, the 5th ball valve 14, the 6th ball valve 15, the 7th ball valve 16, power supply 17, Programmable Logic Controller 18, liquid crystal touch screen 19, filtrator 20, USB flash disk 21, solid-state relay 22; Filtrator 20 is installed in attemperater 1 and connects on the house steward that, and electric heater 2 is arranged on attemperater 1 inside, and the endpiece of filtrator 20 communicates with the entrance point of water circulating pump 5; The endpiece of water circulating pump 5 communicates with the entrance point of flowmeter 6; The endpiece of flowmeter 6 communicates with the entrance point of the 7th ball valve 16, and the endpiece of the 7th ball valve 16 communicates with water trap 4; First ball valve 10, second ball valve 11 are installed in water collector 3 respectively and connect on two bye-passes, and the 3rd ball valve 12, the 4th ball valve 13 are installed on the bye-pass that two companies of water trap 4 go out; The 5th ball valve 14 is installed on the attemperater 1; Water collector 3 communicates with the entrance point of the 6th ball valve 15, and the endpiece of the 6th ball valve 15 communicates with attemperater 1; First temperature sensor 7 is installed on the water collector 3; Second temperature sensor 8 is installed on the water trap 4; Three-temperature sensor 9 is installed on the attemperater 1; The output terminal of the output terminal of the output terminal of flowmeter 6, first temperature sensor 7, second temperature sensor 8, the output terminal of three-temperature sensor 9 all link to each other with the input end of Programmable Logic Controller 18, the output terminal of Programmable Logic Controller 18 links to each other with input end, the control short circuit current of power supply 17, the solid-state relay 22 of liquid crystal touch screen 19 respectively, solid-state relay 22 links to each other with electric heater 2, and liquid crystal touch screen 19 links to each other with USB flash disk 21.

This embodiment by water collector 3 with place an order U or double-H groove weld pipe laying be connected, utilize solid-state relay control heating power, the data that adopt the USB flash disk real-time storage to gather.

This embodiment adopts infinite line thermal source correction model formula to be:

$T_f=T_{\mathrm{ff}}+q_l\&CenterDot;[R_b+\frac{1}{4\mathrm{\&pi;}{\mathrm{\&lambda;}}_s}\&CenterDot;\mathrm{Ei}\left(\frac{{\mathrm{<figure-callout\; id="2"\; label="d\; b"\; filenames="HSA00000429206700011.png"\; state="\{\{state\}\}">d</figure-callout>}}_b^{}{\mathrm{\&rho;}}_s{\mathrm{<figure-callout\; id="16"\; label="c\; s"\; filenames="HSA00000429206700011.png"\; state="\{\{state\}\}">c</figure-callout>}}_s}{16{\mathrm{\&lambda;}}_s\mathrm{\&tau;}}\right)]+\mathrm{\&Delta;}{T}_x$

In the formula

Q is a heating power; H is a pipe laying depth, T _fThe medial temperature of recirculated water in the ground pipe laying; T _FfBe the undisturbed temperature of soil far-end; ρ _sc _s, λ _sBe respectively volumetric ratio thermal capacitance, the coefficient of heat conductivity of soil;

Be exponential integral function, u is an integration variable.Consider hot-fluid along the unevenness of pipe range hot-fluid, the quantity of U type pipe and the hot-fluid short circuit between the arm, the correction of the introducing temperature difference:

$\mathrm{\&Delta;}{T}_x=\frac{q_l(R_c+\mathrm{Rp})}{2\mathrm{\&pi;rH}\&times;D\&times;N}$

R wherein _cBe the convection heat transfer thermal resistance between recirculated water and the tube wall; R _pBe the buried tube heat exchanger heat transfer resistance, H is a drilling depth, and N is a U pipe number, and D is a hot-fluid short circuit correction factor

This embodiment measuring accuracy height, the heating power scope is wide, calculate simple, and according to recirculated water medial temperature, soil initial temperature, heating power, quantity of circulating water and drilling depth are calculated the infinite line thermal source correction model of soil thermal physical property parameter, this model has been considered the influence of the hot-fluid short circuit between ground pipe laying two arms, has improved measuring accuracy.

Claims (3)

1. a miniaturization high precision soil coefficient of heat conductivity on-spot tester is characterized in that it comprises attemperater (1), electric heater (2), water collector (3), water trap (4), water circulating pump (5), flowmeter (6), first temperature sensor (7), second temperature sensor (8), three-temperature sensor (9), first ball valve (10), second ball valve (11), the 3rd ball valve (12), the 4th ball valve (13), the 5th ball valve (14), the 6th ball valve (15), the 7th ball valve (16), power supply (17), Programmable Logic Controller (18), liquid crystal touch screen (19), filtrator (20), USB flash disk (21), solid-state relay (22); Filtrator (20) is installed on the house steward that attemperater (1) connects, and electric heater (2) is arranged on attemperater (1) inside, and the endpiece of filtrator (20) communicates with the entrance point of water circulating pump (5); The endpiece of water circulating pump (5) communicates with the entrance point of flowmeter (6); The endpiece of flowmeter (6) communicates with the entrance point of the 7th ball valve (16), and the endpiece of the 7th ball valve (16) communicates with water trap (4); First ball valve (10), second ball valve (11) are installed in respectively on two bye-passes that water collector (3) connects, and the 3rd ball valve (12), the 4th ball valve (13) are installed on the bye-pass that two companies of water trap (4) go out; The 5th ball valve (14) is installed on the attemperater (1); Water collector (3) communicates with the entrance point of the 6th ball valve (15), and the endpiece of the 6th ball valve (15) communicates with attemperater (1); First temperature sensor (7) is installed on the water collector (3); Second temperature sensor (8) is installed on the water trap (4); (9 are installed on the attemperater (1) three-temperature sensor; The output terminal of the output terminal of the output terminal of flowmeter (6), first temperature sensor (7), second temperature sensor (8), the output terminal of three-temperature sensor (9) all link to each other with the input end of Programmable Logic Controller (18), the output terminal of Programmable Logic Controller (18) links to each other with input end, the control short circuit current of power supply (17), the solid-state relay (22) of liquid crystal touch screen (19) respectively, solid-state relay (22) links to each other with electric heater (2), and liquid crystal touch screen (19) links to each other with USB flash disk (21).

2. a kind of miniaturization high precision soil coefficient of heat conductivity on-spot tester according to claim 1, it is characterized in that it pass through water collector (3) with the U pipe laying that places an order be connected.

3. a kind of miniaturization high precision soil coefficient of heat conductivity on-spot tester according to claim 1 is characterized in that it passes through water collector (3) and be connected with underground double-H groove weld pipe laying.

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