CN202119740U - Tester for geotechnical thermal physical property and heat exchanging capability of buried tube - Google Patents

Abstract

A tester for geotechnical thermal physical property and heat exchanging capability of a buried tube comprises a geotechnical thermal response test module and a thermal response solving output module, wherein the geotechnical thermal response test module consists of a test water branch and a weak current module. The test water branch is formed by an electronic constant-power type electric heater, a shield pump, a flowmeter, a filter and connecting tubes; and the weak current module is formed by an intelligent control board, a temperature sensor and a human-computer interaction display board. The test water branch and the weak current module are arranged in the same casing which is provided with a water inlet and a water outlet and communicated with a heat exchanger of the buried tube. The thermal response solving output module consists of a parameter estimation system for a geotechnical lumped thermal resistance measurement model, a solving software package for calculating the heat exchanging capability of the buried tube and a printout device. The tester for the geotechnical thermal physical property and the heat exchanging capability of the buried tube has the advantages of being high in accuracy of the constant power and the software package solving, small in structure of an overall unit, attractive in appearance of the overall unit, convenient to take and use and the like.

Description

A kind of ground thermal property and ground pipe laying exchange capability of heat tester

Technical field

The utility model relates to a kind of ground thermal property and ground pipe laying exchange capability of heat tester, belongs to ground thermal property and measures and the ground source heat pump technology field.

Background technology

Whether earth source heat pump really plays good energy-conservation and reduces discharging benefit as important new forms of energy and regenerative resource application technology, and ground pipe laying exchange capability of heat is important effect wherein; If exchange capability of heat is too small, can cause summer heat pump cooling water temperature too high, perhaps winter is low excessively; All can have a strong impact on exerting oneself and Energy Efficiency Ratio (COP) of source pump; Cause energy expenditure to greatly increase, make the system not only can't be energy-conservation, become the high energy consumption air-conditioning on the contrary.Otherwise, if exchange capability of heat is excessive,, increased initial cost unreasonably though then heat pump COP can promote to some extent, influence the economy of air-conditioning system.How could design better pipe laying heat-exchange system; " earth-source hot-pump system engineering legislation " local revised edition in 2009 proposed pointedly the employing ground thermal property tester over the ground the pipe laying system carry out the thermal response test; With the coefficient of heat conductivity λ that confirms underground ground and thermal capacity ρ c etc., and then confirm ground pipe laying linear meter(lin.m.) exchange capability of heat.But; Because complicacy that the complicacy of rock soil mass and thermal process thereof, theoretical model are set around the ground pipe laying and solution procedure thereof is non-linear etc.; Relevant method for solving or accuracy commonly used at present are difficult to confirm; Therefore there is serious convergence problem, also is difficult to obtain gratifying accurate solving result up at present, and the rationality of various heat transfer model in practical applications and validity and the measuring accuracy of ground thermal property tester is also difficult to reach any firm conclusions accordingly.

How to break through the difficult problem that parameter is accurately found the solution, in the engineering usage range, obtain pipe laying exchange capability of heat data reliably? No matter since, all be difficult to address the above problem comprehensively from more exquisite model being set or improving aspect such as solution technique.Simultaneously; Existing ground thermal property tester often its constant control method that adds heat is comparatively complicated; Adopt bigger constant temperature water tank control heating power; Employing stabilized voltage supply etc. guarantees the constant problem of heating power under the mains voltage variations situation of building site complicacy; Summer in the winter two kinds of operating modes of the measuring instrument that has also simulating respectively adopt well heater and refrigeration machine to carry out the ground thermal property test under cooling and two kinds of conditions of heat supply respectively, and the dependence test instrument respectively has characteristics, but there is deviation in the measurement consistance of the product of different research and development main bodys; And it is more correct to be difficult to which kind of instrument of identification, and its basic reason just is the complicacy of object to be measured and the complexity problem of method for solving thereof.Therefore be necessary then that the pipe laying design object is attempted new solution route from ground, and develop the ground thermal property tester that has better measurement and find the solution degree of accuracy.

Summary of the invention

The purpose and the task of the utility model are; To measure for ground thermal property in the confirming of the ground pipe laying exchange capability of heat in the present earth source heat pump design process and method for solving in the problem that exists; A kind of new technique route is proposed; Set up the lump thermal resistance metering model of brand-new ground thermal property and ground pipe laying exchange capability of heat test and find the solution system; And adopt the permanent power method of high-precision electronic to measure, and obtain the more ground pipe laying exchange capability of heat measurement parameter of pin-point accuracy, for earth-source hot-pump system design and guidance operation provides technical foundation.

The test philosophy and the methods analyst of this ground thermal property and ground pipe laying exchange capability of heat measuring instrument are following: at first analyzing the structural relation of ground commonly used pipe laying heat transfer model explained variable Tf and each explanatory variable, is example with the line source model:

At first analyzing the structural relation of ground commonly used pipe laying heat transfer model explained variable Tf and explanatory variable, is example with the line source model:

$T_f=T_{\mathrm{ff}}+q_l\·[R_b+\frac{1}{4{\mathrm{\π\λ}}_s}\·\mathrm{Ei}\left(\frac{d_b^2{\mathrm{\ρ}}_s{c}_s}{16{\mathrm{\λ}}_s\mathrm{\τ}}\right)]\≈T_{\mathrm{ff}}+q_l\·[R_b+\frac{1}{4{\mathrm{\π\λ}}_s}\·(\ln \left(\frac{16{\mathrm{\λ}}_s\mathrm{\τ}}{d_b^2{\mathrm{\ρ}}_s{c}_s}\right)-\mathrm{\γ})]---\left(1\right)$

For buried pipe bit to be measured hole, structural parameter (like U type pipe and bore diameter d, U type tube pitch D), physical parameter (ground λ s, ρ s, cs, Rb, Tff etc.) belong to set parameter or condition; As the outer amount of disturbing ql of explanatory variable etc. is stochastic variable; τ is the nonrandomness explanatory variable; Other factors Xi has comprised other not Consideration.

Can (1) formula be rewritten as following ground lump thermal resistance metering model:

$\mathrm{Rt}=\frac{\mathrm{Tf}-\mathrm{Tff}}{\mathrm{ql}}=\mathrm{\α}+\mathrm{\β}\ln \mathrm{\τ}+\mathrm{\μ}---\left(2\right)$

Wherein new interpretation variable R t is (unit length) ground lump thermal resistance (or defining the ground lump Coefficient K t=1/Rt that the designer uses always), can measure acquisition indirectly through measuring Tf, Tff, ql etc.α, β are the thermal resistance lumped parameter, combine all kinds of structural parameters and the physical parameter of each heat transfer model, and these parameters all can be thought deterministic in works scope.(2) has only nonrandomness explanatory variable τ in the formula right-hand side expression.μ is the stochastic error item.For the testing bore holes of a set engineering site, except time τ, can think in each influence factor of the lump thermal resistance Rt that (2) formula is expressed on the practical applications meaning, to remain unchanged.

Simultaneously, the purpose of finding the solution the ground thermal property model is: confirm ground pipe laying linear meter(lin.m.) heat ql or single boring heat Q:

$\mathrm{ql}=Q/H=\frac{\mathrm{Tf}-\mathrm{Tff}}{\mathrm{Rt}}---\left(3\right)$

Therefore; Though only be the simple deformation of equation expression formula; But the process of finding the solution pipe laying designing and calculating required linear meter(lin.m.) heat ql in ground according to (2) and (3) obtains greatly to simplify: we need not to know any relevant structural parameter, physical parameter; Comprise the ground thermal property parameter, and can obtain α, β through returning, and analyze the character of each explanatory variable, explained variable and stochastic error item thereof according to the Rt that records indirectly; Obtain parameter estimation such as α, β result more accurately and effectively through related check, correction technique, and by formula (4) calculate by the time linear meter(lin.m.) heat ql (τ).Thus, problem is also found the solution problem by the hot physical model of complicacy and is converted into ground lump thermal resistance metering model and finds the solution problem, and has constituted the definite simultaneous equations metering model of new ground pipe laying exchange capability of heat by the Simultaneous Equations that (2) formula and (3) formula are formed.Simultaneously, for gang of wells, interact owing to what be adjacent to conduct heat between the pipe laying; Also need consider relevant gang of wells correction problem; Concrete grammar is to try to achieve the additional thermal resistance Rsn under the gang of wells influence by means of relevant heat transfer model, and considers short-term continuous impulse load additional thermal resistance Rtsp, and user's actual run time share Fc; Try to achieve the ground lump thermal resistance under the gang of wells condition

$\mathrm{Rtn}=\mathrm{Rb}+(\mathrm{Rs}+\mathrm{Rsn})*\mathrm{Fc}+\mathrm{Rtsp}*(1-\mathrm{Fc})$

$=\mathrm{Rb}+(\frac{1}{2{\mathrm{\π\λ}}_s}I\left(\frac{d_b/2}{2\sqrt{\frac{{\mathrm{\λ}}_s\mathrm{\τ}}{{\mathrm{\ρ}}_s{c}_s}}}\right)+\frac{1}{2{\mathrm{\π\λ}}_s}\underset{i=2}{\overset{n}{\mathrm{\Σ}}}I\left(\frac{x_i}{2\sqrt{\frac{{\mathrm{\λ}}_s\mathrm{\τ}}{{\mathrm{\ρ}}_s{c}_s}}}\right))*\mathrm{Fc}+\frac{1}{2{\mathrm{\π\λ}}_s}I\left(\frac{d_b/2}{2\sqrt{\frac{{\mathrm{\λ}}_s{\mathrm{\τ}}_p}{{\mathrm{\ρ}}_s{c}_s}}}\right)*(1-\mathrm{Fc})---\left(4\right)$

The Rt=Rb+Rs item is more much bigger than additional heat resistance item usually in the formula (4), is the major part among the Rtn.And then consider that the linear meter(lin.m.) heat ql under the gang of wells influence can be calculated as follows:

$\mathrm{ql}=Q/H=\frac{\mathrm{Tf}-\mathrm{Tff}}{\mathrm{Rtn}}---\left(5\right)$

According to above-mentioned ground lump thermal resistance metering equation model (equation 2～5), can obtain pipe laying exchange capability of heat measured result more accurately.And then develop novel ground thermal property and ground pipe laying exchange capability of heat tester according to inferior technology path.

The specific descriptions of the utility model are: a kind of ground thermal property and ground pipe laying exchange capability of heat tester; Finding the solution output module by ground thermal response test module and thermal response forms; Wherein ground thermal response test module (1) comprises the test water branch road of being made up of electric heater (5), water pump (6), flowmeter (4), filtrator (7) and connecting pipe that is arranged in the same cabinet (3); The light current module of forming by Based Intelligent Control plate (12), cooling-water temperature sensor (8), communication interface (9), ring temperature sensor (10), communication coupling arrangement (11), human-computer interaction display panel (3); Cabinet (3) is provided with water inlet (A), water delivering orifice (B) is connected with ground heat exchanger; Ground thermal response test module (1) is found the solution host computer (2) through communication coupling arrangement (11) and thermal response and is linked to each other; Thermal response is found the solution host computer (2) and is linked to each other with print out equipment through output interface (13); It is characterized in that electric heater adopts the permanent power-type electric heater unit of high-accuracy self-adaptation electronics; Water pump adopts self-priming canned motor pump; Cooling-water temperature sensor adopts temperature sensors of high precision, thermal response to find the solution the software package of finding the solution that parameter estimation system that output module comprises ground lump thermal resistance metering model and ground pipe laying exchange capability of heat calculate, thermal response find the solution host computer (2) integrated parameter estimation system and the ground pipe laying exchange capability of heat of ground lump thermal resistance metering model completely newly calculate find the solution software package.

Communication coupling arrangement (11) adopts communication link wiring construction or radio communication device.The probe segment of ring temperature sensor (10) is arranged at the casing outside of cabinet (3), adopts the general precision probe.

Adopt said apparatus and measuring method to transform existing temperature model of fit as can break away from this uncertain disturbing influence error in dipping correction model based on rock soil mass heat exchange parameter complex effects; Thereby change this thermal technology's problem into the quantitative analysis problem; And then adopt this new type measuring instrument and model solution software thereof; Can obtain pinpoint accuracy more by the time lump thermal resistance (or lump heat transfer coefficient); And then calculate easily under various out temperatures by the time linear meter(lin.m.) heat curve, for ground pipe laying design and construction, the operation of air conditioner assessment of instructing the earth source heat pump engineering better provides technical foundation with reducing energy consumption.Simultaneously, the utlity model has that permanent power precision is high, the software package solving precision is high, complete machine structure small and exquisite attractive in appearance, portably use characteristics such as convenient.

Description of drawings

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

Each unit number and title are following among Fig. 1:

Host computer, 3 cabinets, 4 flowmeters, 5 electric heaters, 6 water pumps, 7 filtrators, 8 cooling-water temperature sensors, 9 communication interfaces, 10 ring temperature sensors, 11 communication coupling arrangements, 12 intelligent controllers, 13 output interfaces, A water inlet, B water delivering orifice are found the solution in 1 ground thermal response test module, 2 thermal responses.

Embodiment

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

Ground thermal property and ground pipe laying exchange capability of heat tester are found the solution output module by ground thermal response test module and thermal response and are formed; Wherein ground thermal response test module (1) comprises the test water branch road of being made up of electric heater (5), water pump (6), flowmeter (4), filtrator (7) and connecting pipe that is arranged in the same cabinet (3); The light current module of forming by Based Intelligent Control plate (12), cooling-water temperature sensor (8), communication interface (9), ring temperature sensor (10), communication coupling arrangement (11), human-computer interaction display panel (3); Cabinet (3) is provided with water inlet (A), water delivering orifice (B) is connected with ground heat exchanger; Ground thermal response test module (1) is found the solution host computer (2) through communication coupling arrangement (11) and thermal response and is linked to each other; Thermal response is found the solution host computer (2) and is linked to each other with print out equipment through output interface (13); Electric heater adopts the permanent power-type electric heater unit of high-accuracy self-adaptation electronics; Water pump adopts self-priming canned motor pump; Cooling-water temperature sensor adopts temperature sensors of high precision, thermal response to find the solution the software package of finding the solution that parameter estimation system that output module comprises ground lump thermal resistance metering model and ground pipe laying exchange capability of heat calculate, thermal response find the solution host computer (2) integrated parameter estimation system and the ground pipe laying exchange capability of heat of ground lump thermal resistance metering model completely newly calculate find the solution software package.Communication coupling arrangement (11) adopts the communication link wiring construction.The probe segment of ring temperature sensor (10) is arranged at the casing outside of cabinet (3), adopts the general precision probe.

Claims (3)

1. ground thermal property and ground pipe laying exchange capability of heat tester; Finding the solution output module by ground thermal response test module and thermal response forms; Wherein ground thermal response test module (1) comprises the test water branch road of being made up of electric heater (5), water pump (6), flowmeter (4), filtrator (7) and connecting pipe that is arranged in the same cabinet (3); The light current module of forming by Based Intelligent Control plate (12), cooling-water temperature sensor (8), communication interface (9), ring temperature sensor (10), communication coupling arrangement (11), human-computer interaction display panel (3); Cabinet (3) is provided with water inlet (A), water delivering orifice (B) is connected with ground heat exchanger; Ground thermal response test module (1) is found the solution host computer (2) through communication coupling arrangement (11) and thermal response and is linked to each other; Thermal response is found the solution host computer (2) and is linked to each other with print out equipment through output interface (13); It is characterized in that electric heater adopts the permanent power-type electric heater unit of high-accuracy self-adaptation electronics, water pump adopts self-priming canned motor pump, and cooling-water temperature sensor adopts temperature sensors of high precision; The software package of finding the solution that parameter estimation system that output module comprises ground lump thermal resistance metering model and ground pipe laying exchange capability of heat calculate is found the solution in thermal response, thermal response find the solution host computer (2) integrated parameter estimation system and the ground pipe laying exchange capability of heat of ground lump thermal resistance metering model completely newly calculate find the solution software package.

2. ground thermal property as claimed in claim 1 and ground pipe laying exchange capability of heat tester is characterized in that described communication coupling arrangement (11) adopts communication link wiring construction or radio communication device.

3. ground thermal property as claimed in claim 1 and ground pipe laying exchange capability of heat tester is characterized in that the probe segment of described ring temperature sensor (10) is arranged at the casing outside of cabinet (3), adopts the general precision probe.