CN102680515B - Device for simulating ground source heat pump - Google Patents
Device for simulating ground source heat pump Download PDFInfo
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- CN102680515B CN102680515B CN201210169949.5A CN201210169949A CN102680515B CN 102680515 B CN102680515 B CN 102680515B CN 201210169949 A CN201210169949 A CN 201210169949A CN 102680515 B CN102680515 B CN 102680515B
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Abstract
The invention discloses a device for simulating a ground source heat pump. The device comprises a ground layer simulating system, a heat exchanger simulating system and a data collecting system, wherein the ground layer simulating system is composed of a weighbridge, a stainless steel sleeve, soil, a drill hole, a cover board and a constant-temperature water bath kettle; the heat exchanger simulating system is composed of backfill material, an U-shaped pipe, a low-temperature constant-temperature groove, a self-absorption clean water pump, a flowmeter, a tee and a valve; the data collecting system is composed of a temperature/humidity recorder, a PT100-type thermal resistor and a temperature/humidity transducer; the backfill material of the heat exchanger simulating system is arranged in the drill hole of the ground layer simulating system; and the PT100-type thermal resistor of the data collecting system is arranged in the soil of the ground layer simulating system. According to the invention, the device can be used for researching temperature distribution with different depths and different radial soil layers under the action of a buried-pipe heat exchanger and further investigating a heat exchange pattern in the soil so as to realize calculation and verification of a heat transferring model; furthermore, the device can be used for investigating the influence of different backfill materials to the total heat exchange effect and realizing screening and estimation on the backfill materials; in addition, the device also can be used for the research on the influence and the like of different circular water flows to heat exchange quantity in cold or hot working conditions.
Description
Technical field
The present invention relates to a kind of vertical closed-loop ground source heat pump analogue means, relate in particular to the simulation of heat exchanging process between recirculated water in earth-source hot-pump system, backfilling material and soil three.
Background technology
Earth-source hot-pump system is one and utilizes geothermal using resource to carry out heating, freezes and the environmental protection air-conditioning technical of hot water supply, comprises closed-loop ground source heat pump, surface water ground source heat pump and groundwater heat pump.Form using soil as the buried pipe ground-source heat pump system of Cooling and Heat Source primarily of buried pipe heat exchange system, ground source heat pump and indoor heating air conditioning terminal system.Buried pipe heat exchange system is made up of ground heat exchanger, water circulating pump and the circulation line that is filled with circulation fluid (mainly water or take water as the anti freezing solution of principal ingredient).Ground heat exchanger is the key problem in technology of buried pipe ground-source heat pump system, and the size of its exchange capability of heat directly affects the usefulness of earth-source hot-pump system.
The earth source heat pump cause of China is started late, and has used for reference external technology and achievement to the pilot study of earth source heat pump, and research work is mainly with based on the ground source heat pump project of reality.Because earth source heat pump project investment cost is high, drilling depth is large, Rock And Soil heterogeneity and seepage action of ground water, cause owing deeply the research of the heat transfer complicated in soil of ground heat exchanger, mass transfer coupling process, existing achievement in research is also difficult to effectively be applied to Practical Project.Therefore, develop a kind of earth source heat pump simulation heat-exchanger rig, for research work and practical engineering application, there is important directive significance.
Summary of the invention
The object of the invention is to provide a kind of earth source heat pump analogue means by deficiency simulated for earth-source hot-pump system reasonably and accurately for prior art, to simulate based on the underground pipe heat exchange principle in Practical Project, the research for ground source heat pump technology provides a kind of possible technique scheme.
Concrete technical scheme of the present invention is as follows:
A kind of earth source heat pump analogue means, it comprises:
One stratum simulation system, comprise on-ground weigher, stainless steel sleeve, soil, boring, cover plate and thermostat water bath, described stainless steel sleeve is located on on-ground weigher, soil and boring are located in stainless steel sleeve, cover plate is covered on stainless steel sleeve, and thermostat water bath and stainless steel sleeve form water-flow circuit by pipeline;
One heat interchanger simulation system, comprise backfilling material, U-shaped pipe, low temperature thermostat bath, self suction clean water pump, flowmeter, threeway and valve, described U-shaped pipe is located in backfilling material, after threeway, valve, low temperature thermostat bath, self suction clean water pump, flowmeter, threeway, valve are connected successively by pipeline, be connected to the two-port of U-shaped pipe, form water-flow circuit;
One data acquisition system (DAS), comprises humiture registering instrument, PT100 type thermal resistance and humiture transducer, and described PT100 type thermal resistance and humiture transducer connect humiture registering instrument; Wherein:
The backfilling material of described heat interchanger simulation system is located in the boring of stratum simulation system, and the PT100 type thermal resistance of data acquisition system (DAS) is located in the soil of stratum simulation system.
Described cover plate is a transparent plastic cover plate, it has the concentrically ringed hole of array, and PT100 type thermal resistance inserts in its hole.
Directly heat interchange can be carried out between described recirculated water, U-shaped pipe, backfilling material three; U-shaped pipe is the PE100 ground source heat pump special tube of DN25; Each pipeline outer wall and stainless steel sleeve drum outer wall are all coated with polyurethane heat insulation material; Backfilling material is strength cement-based grouting material, and its composition is cement, natural river sand, bentonitic clay, water reducer, water and silicon ash, slag mineral admixture.
Described low temperature thermostat bath inner bag volume is 10 ~ 30L, temperature range-5 ~ 100 DEG C, adopts microcomputer temperature control, automatically controls (PID) adjustment, high and low temperature two grades switching; Cmf record flows through the volumetric flow rate of circulating line, and measurement range is 0 ~ 20L/min.
Described humiture registering instrument has 20 ~ 40 passages, automatically records and preserve the data that array is transmitted by PT100 type thermal resistance and humiture transducer.
Described PT100 type thermal resistance is PTFE, and range is 0 ~ 50 DEG C, and scale division value is 0.01 DEG C; PT100 type thermal resistance for measuring the soil moisture inserts the different depth of soil behind cover plate location, is connected to humiture registering instrument; The PT100 type thermal resistance importing and exporting water temperature for measuring recirculated water is connected on two threeways respectively, is connected to humiture registering instrument.
Described humiture transducer, for measuring the epidemic disaster of air, is connected to humiture registering instrument.
The present invention can be used for research different depth, Different Diameter under ground heat exchanger effect and, to edaphic Temperature Distribution, and then investigates the heat exchange law in soil, realizes the calculation and demonstration to heat transfer model; Can be used for investigating the impact of different backfilling material on total heat transfer effect, realize the screening and evaluation to backfilling material; The impact etc. of different circulating water flow exchange heat under also can be used for studying hot and cold operating mode.The present invention utilizes the temperature difference of recirculated water and soil, realizes heat exchange, can ensure the continuous and steady operation in certain hour by PE pipe and backfilling material.By simplifying, for the research of earth source heat pump creates advantage labile factors such as temperature sudden change, Groundwater Flow, geologic structure complexity.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is soil point for measuring temperature distribution plan of the present invention;
Fig. 3 is the edaphic temperature changing curve diagram of different depth under cooling condition of the present invention;
Fig. 4 be under cooling condition of the present invention Different Diameter to edaphic temperature changing curve diagram.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described:
Consult Fig. 1, the present invention includes three systems-stratum simulation system, heat interchanger simulation system and data acquisition system (DAS).Wherein, stratum simulation system comprises on-ground weigher 1, stainless steel sleeve 2, soil 3, boring 4, cover plate 5 and thermostat water bath 6, stainless steel sleeve 2 is located on on-ground weigher 1, soil 3, boring 4 are located in stainless steel sleeve 2, cover plate 5 is covered on stainless steel sleeve 2, and thermostat water bath 6, stainless steel sleeve 2 form water-flow circuit by pipeline.
Heat interchanger simulation system, comprise backfilling material 7, U-shaped pipe 8, low temperature thermostat bath 11, self suction clean water pump 12, flowmeter 13, threeway 9 and valve 10, described U-shaped pipe 8 is located in backfilling material 7, after threeway 9, valve 10, low temperature thermostat bath 11, self suction clean water pump 12, flowmeter 13, threeway 9, valve 10 are connected successively by pipeline, be connected to the two-port of U-shaped pipe 8, form water-flow circuit.
Data acquisition system (DAS), comprises humiture registering instrument 14, PT100 type thermal resistance 15 and humiture transducer 16, and described PT100 type thermal resistance 15 and humiture transducer 16 connect humiture registering instrument 14.
Described U-shaped pipe 8 is single U tube or double U tube, and during for double U tube, 4 sizes of holing should corresponding increase.
Described PT100 type thermal resistance 15 is PTFE, and range is 0 ~ 50 DEG C, and scale division value is 0.01 DEG C; PT100 type thermal resistance 15 for measuring the soil moisture inserts the different depth of soil behind cover plate location, is connected to humiture registering instrument 14; The PT100 type thermal resistance 15 importing and exporting water temperature for measuring recirculated water is connected on two threeways 9 respectively, is connected to humiture registering instrument 14.
The principle following (for heating cycle) of heat interchanger simulation system of the present invention: recirculated water is heated to target temperature through low temperature thermostat bath 11, be delivered in pipeline by self suction clean water pump 12, the annexes such as approach flowmeter 13, valve 10, flow in U-shaped pipe 8, circulating hot water carries out heat exchange through U-shaped tube wall and backfilling material 7, can cause the temperature rise of backfilling material 7, this can cause again the temperature variation of soil 3.Reflect heat and mass coupling process complicated in Practical Project truly.
Described on-ground weigher 1 for measuring the weight of soil 3, by certain packing volume the weight of the earth that bankets, calculate its packing, contrast with the packing of natural stratum, choose correction factor.
The diameter of described stainless steel sleeve 2 is 1.5 ~ 3m, high 1.5 ~ 3m, and barrel is provided with insulation jacket, is connected with thermostat water bath 6 by pipeline; Fill up soil 3 in cylinder, can be clay, sand, ground or loess, after being tamped by soil, opening the boring 4 that a diameter is 0.1 ~ 0.2 m in center, for simulating the wall of a borehole in Practical Project.
Accompanying drawings 2, the present invention by arrange in soil different depth and Different Diameter to point for measuring temperature, can thermo parameters method be obtained, for the calculating of heat exchange models and checking provide experimental data.Described point for measuring temperature is distributed as: in the radial direction of stainless steel sleeve, with 4 centers of holing for the center of circle, distributed 6 concentric circless comprising the wall of a borehole and sleeve lining, for arranging the point for measuring temperature of PT100 type thermal resistance 15; At depth direction, be distributed with top layer-0.2m, middle level-0.8m and bottom-1.4m three thermometric layers.
Embodiment 1
Consult Fig. 3, utilize the present invention, under cooling condition (circulating water temperature is set to 0 DEG C, and flow is 3.3 L/min), research different depth soil horizon temperature is with the Changing Pattern of working time.
As can be seen from the figure, topsoil (-0.2m) is the most remarkable by heat exchanger tube and ectocine, and in initial 20h, the soil moisture sharply declines, and changes less afterwards, and shows along with atmospheric temperature fluctuation and the phenomenon of fluctuation.Show in figure, the temperature variation of topsoil lags behind temperature Change 2 ~ 3h.Along with the increase of depth of soil, soil moisture fall reduces.After reaching heat exchange balance ,-0.8m temperature layer is rendered as steady state (SS).And for-1.4m the soil of the bottom, its medial temperature affects by heat exchanger tube hardly.
Visible, depth of soil is larger, and heat transfer effect is more weak, and topsoil gentle heat trnasfer of being bullied has the greatest impact.The change of the soil moisture has delay in various degree and decay relative to atmospheric temperature, and soil postpones larger more deeply, and this is very favourable to the cold and heat supply of perpendicularly buried pipe earth source heat pump.Because when needing heat supply winter, temperature is minimum, and soil moisture not least level; Summer be when need freeze, maximum temperature, and the non-highest level of the soil moisture.
Embodiment 2
Consult Fig. 4, utilize the present invention, under cooling condition (circulating water temperature is set to 0 DEG C, and flow is 3.3L/min), research Different Diameter is to the Changing Pattern of the soil moisture with working time.
From the radial 0.195m soil horizon that heat exchanger tube is nearest, in initial 20h, temperature sharply declines, and shows the phenomenon fluctuating along with the fluctuation of atmospheric temperature and postpone afterwards.The temperature (0.335m, 0.470m) of middle two radial layers slowly declines with the prolongation of working time, and the later stage tends towards stability.Radial 0.610m soil horizon from heat exchanger tube farthest, adds the effect of polyurethane heat insulation material, only shows self accumulation of heat effect and condition depended effect.
Visible, Different Diameter to soil horizon have delay in various degree and decay with the change of atmospheric temperature; From heat exchanger tube more close to soil horizon heat transfer effect more remarkable, soil horizon heat transfer effect far away is more weak.According to Temperature Distribution, the resistance network method that also can obtain this device is 0.55 ~ 0.61m.
Embodiment 3
Utilize the present invention, under heating cycle (recirculated water 40 DEG C, flow 3.7L/min), run 168h, according to heat exchange result calculate boring in heat exchange models, brief calculation process and result as follows:
1) one-dimensional heat conduction model in boring:
| Thermal resistance item | Calculated value (Km/W) | Proportion |
| Fluid is to the thermal resistance of PE pipe | 0.013 | 7.39% |
| PE pipe thermal resistance | 0.054 | 31.75% |
| Grouting material thermal resistance | 0.104 | 60.86% |
Each several part thermal resistance calculation result as shown above.In boring, entire thermal resistance is three's sum, is 0.170 Km/W, and wherein grouting material thermal resistance accounts for the major part of boring internal thermal resistance, and this also demonstrates the significance of research grouting material.By the temperature estimation the wall of a borehole temperature T of existing point for measuring temperature
bbe 27.22 DEG C, then calculate heat flow density q=75.00W/m by equivalent thermal resistance model.
2) two-dimentional conduction model in boring:
As follows by this model calculation: fluid to the thermal resistance of PE pipe outer wall be 0.092 Km/W, PE pipe outer wall to the thermal resistance of the wall of a borehole be 0.070 Km/W.In boring, entire thermal resistance is both sums, is 0.162 Km/W.Same with the wall of a borehole temperature T
b=27.22 DEG C, calculate heat flow density q=78.94 W/m.
Visible, under the long period is run continuously, in the boring calculated by a peacekeeping two dimension conduction model, entire thermal resistance and heat flow density can better be coincide, and show that this device has good reliability for earth source heat pump theoretical research.
Claims (7)
1. an earth source heat pump analogue means, is characterized in that this device comprises:
One stratum simulation system, comprise on-ground weigher (1), stainless steel sleeve (2), soil (3), boring (4), cover plate (5) and thermostat water bath (6), stainless steel sleeve (2) is located on on-ground weigher (1), soil (3) and boring (4) are located in stainless steel sleeve (2), cover plate (5) is covered on stainless steel sleeve (2), and thermostat water bath (6) and stainless steel sleeve (2) form water-flow circuit by pipeline;
One heat interchanger simulation system, comprise backfilling material (7), U-shaped pipe (8), low temperature thermostat bath (11), self suction clean water pump (12), flowmeter (13), threeway (9) and valve (10), U-shaped pipe (8) is located in backfilling material (7), after threeway (9), valve (10), low temperature thermostat bath (11), self suction clean water pump (12), flowmeter (13), threeway (9), valve (10) are connected successively by pipeline, be connected to the two-port of U-shaped pipe (8), form water-flow circuit;
One data acquisition system (DAS), comprises humiture registering instrument (14), PT100 type thermal resistance (15) and humiture transducer (16), and PT100 type thermal resistance (15) and humiture transducer (16) connect humiture registering instrument (14); Wherein:
The backfilling material (7) of described heat interchanger simulation system is located in the boring (4) of stratum simulation system, and the PT100 type thermal resistance (15) of data acquisition system (DAS) is located in the soil (3) of stratum simulation system.
2. earth source heat pump analogue means according to claim 1, is characterized in that: cover plate (5) is a transparent plastic cover plate, it has the concentrically ringed hole of array, and PT100 type thermal resistance (15) inserts in its hole.
3. earth source heat pump analogue means according to claim 1, is characterized in that: the PE100 ground source heat pump special tube that U-shaped pipe (8) is DN25; Each pipeline outer wall and stainless steel sleeve (2) outer wall are all coated with polyurethane heat insulation material; Backfilling material (7) is strength cement-based grouting material, and its composition is cement, natural river sand, bentonitic clay, water reducer, water and silicon ash, slag mineral admixture.
4. earth source heat pump analogue means according to claim 1, is characterized in that: low temperature thermostat bath (11) inner bag volume is 10 ~ 30L, temperature range-5 ~ 100 DEG C, adopts microcomputer temperature control, automatic control and adjustment, high and low temperature two grades switching; Flowmeter (13) recorded stream is through the volumetric flow rate of circulating line, and measurement range is 0 ~ 20L/min.
5. earth source heat pump analogue means according to claim 1, is characterized in that: humiture registering instrument (14) has 20 ~ 40 passages, automatically records and preserve the data that array is transmitted by PT100 type thermal resistance (15) and humiture transducer (16).
6. earth source heat pump analogue means according to claim 1, is characterized in that: PT100 type thermal resistance (15) is PTFE, and range is 0 ~ 50 DEG C, and scale division value is 0.01 DEG C; PT100 type thermal resistance (15) for measuring the soil moisture inserts the different depth of soil (7) behind cover plate (5) location, is connected to humiture registering instrument (14); The PT100 type thermal resistance (15) importing and exporting water temperature for measuring recirculated water is connected on two threeways (9) respectively, is connected to humiture registering instrument (14).
7. earth source heat pump analogue means according to claim 1, is characterized in that: humiture transducer (16), for measuring the epidemic disaster of air, is connected to humiture registering instrument (14).
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| CN108414567B (en) * | 2018-06-11 | 2023-09-19 | 东北林业大学 | Double dynamic variable temperature heat source ground source heat pump experimental device |
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