CN203824152U - Ground-source heat pump system coupled with passive type space radiation refrigeration - Google Patents
Ground-source heat pump system coupled with passive type space radiation refrigeration Download PDFInfo
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- CN203824152U CN203824152U CN201420148281.0U CN201420148281U CN203824152U CN 203824152 U CN203824152 U CN 203824152U CN 201420148281 U CN201420148281 U CN 201420148281U CN 203824152 U CN203824152 U CN 203824152U
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 64
- 230000005855 radiation Effects 0.000 title claims abstract description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 78
- 238000001816 cooling Methods 0.000 claims abstract description 34
- 239000000498 cooling water Substances 0.000 claims description 63
- 229910001335 Galvanized steel Inorganic materials 0.000 claims description 29
- 239000008397 galvanized steel Substances 0.000 claims description 29
- 239000002689 soil Substances 0.000 claims description 21
- 230000008878 coupling Effects 0.000 claims description 17
- 238000010168 coupling process Methods 0.000 claims description 17
- 238000005859 coupling reaction Methods 0.000 claims description 17
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 claims description 16
- 239000002826 coolant Substances 0.000 claims description 10
- 239000003507 refrigerant Substances 0.000 claims description 10
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- 239000011248 coating agent Substances 0.000 claims description 8
- 238000000576 coating method Methods 0.000 claims description 8
- 238000010992 reflux Methods 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 239000012774 insulation material Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 7
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 238000012546 transfer Methods 0.000 description 19
- 238000005516 engineering process Methods 0.000 description 14
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 8
- 238000013461 design Methods 0.000 description 6
- 239000002918 waste heat Substances 0.000 description 5
- 238000004088 simulation Methods 0.000 description 4
- 239000004408 titanium dioxide Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
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- 238000004364 calculation method Methods 0.000 description 3
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- 238000000205 computational method Methods 0.000 description 1
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- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 235000019628 coolness Nutrition 0.000 description 1
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- 238000009792 diffusion process Methods 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
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- IXSZQYVWNJNRAL-UHFFFAOYSA-N etoxazole Chemical compound CCOC1=CC(C(C)(C)C)=CC=C1C1N=C(C=2C(=CC=CC=2F)F)OC1 IXSZQYVWNJNRAL-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model discloses a ground-source heat pump system coupled with passive type space radiation refrigeration. According to the system, passive type space radiation refrigeration is taken as a novel auxiliary refrigerating method of a ground-source heat pump, the problem of unbalanced cooling and heating load of a building all year round is solved effectively through cheap space radiation refrigeration, and efficient and energy-saving operation of the ground-source heat pump system is guaranteed. The ground-source heat pump system is characterized in that an outlet of a space radiation refrigerator is communicated with an inlet of the space radiation refrigerator after passing through a backflow water tank and a plate heat exchanger sequentially; an outlet of a ground heat exchanger is communicated with an inlet of a heat pump unit heat exchanger all along after passing through a ground circulating water pump; an outlet of the heat pump unit heat exchanger is communicated with an inlet of the plate heat exchanger or an inlet of the ground heat exchanger; a valve II which only performs refrigeration starting at night is arranged on a pipeline where the heat pump unit heat exchanger is communicated with the inlet of the plate heat exchanger; and a valve I which only performs refrigeration stopping at night is arranged on a pipeline where the heat pump unit heat exchanger is communicated with the inlet of the ground heat exchanger.
Description
Technical field
The utility model relates to a kind of by passive type irradiation space refrigeration the system with the coupling of underground pipe earth source heat pump, belong to Building Environment and Equipment Engineering, building thermal environments and Refrigeration Engineering technical field.
Background technology
In recent years, utilize the ground source heat pump technology of reproducible shallow layer geothermal energy to obtain developing rapidly in building air conditioning field.Underground pipe ground source heat pump technology wherein flows in the underground buried tube of sealing by circulation fluid, has protected valuable groundwater resources in realizing high efficient heat exchanging.Current many international bodies and government are all using applying underground pipe earth source heat pump as saving the energy, reducing CO
2discharge and improve the important means of environmental problem.Underground pipe ground source heat pump technology utilizes the huge and metastable characteristic of underground temperature of the earth thermal capacity, absorbs heat summer by closed loop ground heat exchanger to soil release heat, winter from soil, realizes building cold and heat supply by heat pump.
But, in applying, run into the obstacle aspect building load balance with the famous underground pipe ground source heat pump technology of energy-conserving and environment-protective.China is across warm temperate zone and subtropical zone, and large amount of building especially commercial building belongs to the refrigeration duty type building that is dominant, and its annual refrigeration duty sum is greater than annual thermic load sum.Use underground pipe ground source heat pump technology in refrigeration duty is dominant type building time, single ground heat exchanger will make be greater than the caloric receptivity of winter from soil to the heat exhaust of soil summer as the Cooling and Heat Source of heat pump, after long-term operation, can make waste heat gather in ground heat exchanger surrounding soil, cause the rising of the soil moisture, and then heat pump inflow temperature in summer is raise, cause whole system operational efficiency to reduce, even make thrashing.The key of dealing with problems and clearing away the obstacles is the annual load balance that ground heat exchanger is born, and gets rid of the unbalanced refrigeration duty of building by other auxiliary cooling modes.
The auxiliary cooling mode of existing underground pipe ground source heat pump technology concentrates on and uses cooling tower to get rid of unbalanced building refrigeration duty in air.But in actual motion, some buildings are because the condition restriction such as location of living in, appearance requirement, water saving requirement, noise control are not suitable for using cooling tower, the underground pipe ground source heat pump technology of energy-conserving and environment-protective to be in these refrigeration dutys are dominant type building, used, more suitable, more energy-conservation auxiliary cooling mode must be sought.
Space nocturnal radiation refrigeration phenomenon has benefited from the infrared electromagnetic radiation heat exchange between Earth surface plane and space (close to absolute zero).The atmosphere of earth surface for wavelength the infra-red radiation between 8～13 μ m approach see through completely.Therefore, at the high object of this wave-length coverage inner surface emissivity, can effectively utilize night space as free low-temperature receiver to discharge self heat.As a kind of effective, cheap passive type nature type of cooling, space nocturnal radiation Refrigeration Technique has obtained the researcher of all circles and has more and more paid close attention to, but due to its can only operation at night, refrigerating capacity is not mated with building refrigeration duty and performance is subject to weather condition to affect the reasons such as larger, space nocturnal radiation refrigeration is not suitable as the stable low-temperature receiver of active refrigeration system.
Utility model content
The shortcoming existing in order to solve prior art, the utility model proposes the irradiation space refrigeration of passive type and active underground pipe ground source heat pump technology are coupled, novel auxiliary refrigeration modes using passive type irradiation space refrigeration as buried pipe ground-source heat pump system, effectively solve the annual cooling and heating load imbalance problem of building by the cheap space nature type of cooling, efficiently move the whole year that ensures buried pipe ground-source heat pump system, expands the range of application of this power-saving technology.
The technical solution adopted in the utility model is as follows:
The buried pipe ground-source heat pump system of coupling passive type irradiation space refrigeration, comprise with irradiation space refrigerator, the source pump of infrared emanation mode release heat and be embedded in the ground heat exchanger in soil, and irradiation space refrigerator is coupled in buried pipe ground-source heat pump system to the connected mode of cooling water pipeline in system: the outlet of described irradiation space refrigerator is communicated with the entrance of irradiation space refrigerator successively after reflux tank and heat exchanger; The outlet of described ground heat exchanger is communicated with the entrance of source pump heat exchanger I all the time after underground pipe water circulating pump; The outlet of source pump heat exchanger I is communicated with the entrance of heat exchanger or the entrance of ground heat exchanger respectively, and on the pipeline being communicated with heat exchanger entrance at source pump heat exchanger I, be provided with the valve II that only refrigeration is opened at night, on the pipeline being communicated with the entrance of ground heat exchanger at source pump heat exchanger I, be provided with only at the valve I closing that freezes at night; Meanwhile, source pump heat exchanger I is communicated with expansion mechanism I, source pump heat exchanger II, compressor and desuperheater successively by refrigerant loop again.
Described irradiation space refrigerator, comprises a metal framework, is provided with one or more radiation refrigerator modules on described metal framework, when described radiation refrigerator module is polylith, between radiation refrigerator module, adopts coating steel pipe to be connected in parallel; Described radiation refrigerator module is two galvanized steel plain sheet compositions, and described galvanized steel plain sheet is provided with the pitting of regular distribution, and forms the mobile gap of Cooling Water between two galvanized steel plain sheets; The two ends of two described galvanized steel plain sheet length directions are communicated with respectively cooling water water knockout drum and cooling water water collector, and described cooling water water knockout drum is communicated with cooling water inlet, and cooling water water collector is communicated with coolant outlet; Width two ends adopt without rivet and press and add adhesive connection.
Described source pump heat exchanger I is condenser in cooling operating mode, is evaporimeter for thermal condition; Described source pump heat exchanger II cooling operating mode is evaporimeter, is condenser for thermal condition.
At source pump heat exchanger II, on the pipeline that source pump heat exchanger I is communicated with, be also provided with the expansion mechanism II in parallel with expansion structure I; Described source pump heat exchanger II is connected on user's side circulating water line, exchange heat by cold-producing medium and user's side recirculated water realizes Winter heat supply and the summer cooling to air-conditioned room, on user's side circulating water line, is provided with chilled water water circulating pump, temperature sensor, flow sensor.
On the entrance connecting pipeline of described heat exchanger and ground heat exchanger, be in series with temperature sensor.
On the entrance connecting line of the outlet of described ground heat exchanger and source pump heat exchanger I, be in series with underground pipe water circulating pump, temperature sensor.
The outlet of source pump heat exchanger I is communicated with the entrance of ground heat exchanger, is provided with control valve I on the pipeline of its connection.As auxiliary cooling source, the outlet of described source pump heat exchanger I is also connected with the entrance of plate type heat exchanger by bypass line and control valve II.
Entrance, the outlet of source pump heat exchanger I, source pump heat exchanger II are communicated with successively, are provided with expansion structure, compressor, desuperheater on the pipeline of its connection.
Described desuperheater is communicated with domestic hot-water's case;
The control method of the buried pipe ground-source heat pump system of described coupling irradiation space refrigeration is as follows:
When Winter heat supply operating mode, irradiation space refrigerator is not worked, and valve I opens, and valve II closes; The high-temperature high-pressure refrigerant of source pump compressor outlet first in desuperheater to domestic hot-water's heat release, then enter source pump heat exchanger II (condenser) by heat medium water to conditioned space heat supply in building, after expansion mechanism II, enter source pump heat exchanger I (evaporimeter) and absorb heat by the recirculated water in ground heat exchanger from soil.
When summer cooling operating mode is moved daytime, irradiation space refrigerator is not worked, and now valve I opens, and valve II closes; The high-temperature high-pressure refrigerant of source pump compressor outlet first in desuperheater to domestic hot-water's heat release, then enter source pump heat exchanger I (condenser) by the recirculated water in ground heat exchanger to soil release heat, with after after decompressor I, enter source pump heat exchanger II (evaporimeter) by chilled water to air-conditioned room cooling in building; While moving irradiation space refrigerator night, the work of irradiation space refrigerator, valve I closes, valve II opens, irradiation space kind of refrigeration cycle water pump is opened, and makes cooling water flow through being installed on the irradiation space refrigerator on roof, discharges uneven part building cooling load by radiation heat transfer space-ward.
As whole system is while continuing the continuous service condition of cooling night, after the high-temperature cooling water being flowed out by source pump condenser I is first taken away part heat via heat exchanger by irradiation space refrigerator, inflow place buried tube heat exchanger continues to soil heat release.If whole system is while stopping the intermittent duty condition of cooling night, only underground pipe water circulating pump and radiation refrigerator water circulating pump cooperation, get rid of the heat gathering in soil by irradiation space refrigerator.Irradiation space refrigerator out of service after sunrise on daytime, Open valve I, valve-off II, closes irradiation space kind of refrigeration cycle water pump, make cooling water in irradiation space refrigerator at Action of Gravity Field downstream to reflux tank.
During out of service by day, irradiation space radiator inside be anhydrous state to reduce the thermal capacity of radiator, increase the radiator efficiently radiates heat amount at night.
The beneficial effects of the utility model are as follows:
The performance of irradiation space refrigerator raises with the increase of its internal cooling water flow velocity, but the excessive energy consumption that can increase again water circulating pump of flow velocity, therefore has the cooling water economic velocity of irradiation space refrigerator.Through simulation relatively, generally under operating mode, this economic velocity is 0.5kg/s left and right.On the other hand, the performance of irradiation space refrigerator depends on the weather conditions such as cloud thickness, ceiling of clouds, dew-point temperature.For realizing efficient operation, should open as much as possible irradiation space refrigerator at night sunny and partly cloudy and that dew-point temperature is low.If the summer cooling phase is interior because the restrictions such as weather condition fail completely uneven refrigeration duty to be got rid of by irradiation space radiator, also open in the winter time underground pipe water circulating pump and radiation refrigerator water circulating pump night in spring later heat supply phase, by its cooperation, under better weather condition, the waste heat gathering in soil is effectively drained into space.
In addition, adopt after coupling passive type irradiation space refrigeration, underground pipe ground source heat pump technology can, according to the be dominant less thermic load design ground heat exchanger of type building of refrigeration duty, reduce the pipe laying total length of ground heat exchanger, has reduced initial cost and the pipe laying floor space of system.According to domestic and international detailed investigation, coupling passive type irradiation space refrigeration is not yet mentioned with the technology of active underground pipe earth source heat pump.
First passive type irradiation space refrigeration and the coupling of underground pipe earth source heat pump are needed to design and within the scope of earth source heat pump cooling water temperature, there is high radiation refrigeration performance and irradiation space refrigerator cheaply.The principle of two kinds of radiating modes realization heat radiations of buried tube heat exchanger and irradiation space refrigerator is different posteriorly, energy consumption efficiency difference, and performance depends on different ambient parameters.Irradiation space refrigerator and ground heat exchanger are coupled as to an efficient system of Life cycle energy-saving, the technology of needing optimal design and operation badly realizes reasonably capacity matching and operation control between ground heat exchanger and irradiation space refrigerator.Therefore, the utility model technology mainly comprises the design and operation scheme of the earth-source hot-pump system of the design of irradiation space radiator, the computational methods of radiation refrigeration amount, the passive type irradiation space radiator that is coupled.
Brief description of the drawings
Fig. 1 irradiation space refrigerator structural map;
Fig. 2 is the B-B view of Fig. 1;
Fig. 3 is the A-A view of Fig. 1;
Fig. 4 irradiation space refrigerator analog computation flow chart;
The be coupled buried pipe ground-source heat pump system schematic diagram of passive type irradiation space refrigeration of Fig. 5;
In figure: 1-1 cooling water water knockout drum, 1-2 cooling water water collector, 1-3 insulation material, 1-4 metal framework, 1-5 galvanized steel plain sheet, 1-6 depression points, 1-7 cooling water inlet, 1-8 coolant outlet, 1 irradiation space refrigerator, 2 reflux tanks, 3 irradiation space kind of refrigeration cycle water pumps, 4 heat exchangers, 5 valve I, 5 ' valve II, 6 ground heat exchangers, 7 underground pipe water circulating pumps, 8 source pump heat exchanger I, 9 expansion mechanism I, 9 ' expansion mechanism II, 10 source pump heat exchanger II, 11 user's side water circulating pumps, 12 compressors, 13 desuperheaters, 14 domestic hot-water's casees, 15 building grounds, 16 hot water for life equipment, 17 air-conditioned rooms, 18 building roofs, 19 temperature sensors, 20 flow sensors.
Detailed description of the invention
According to analysis of Heat Transfer result, the irradiation space refrigerator of working within the scope of source pump cooling water temperature needs reinforcement material emissivity as much as possible, and increase as far as possible cooling water with extraneous relative heat exchange area with the higher refrigeration performance of realization.Compared with baroque radiation cooling device, simple slab construction has suitable radiation refrigeration ability, and more easily processing, installation and maintenance, has higher cost performance.Therefore, the utility model discloses a kind of simply constructed radiation refrigerator module, as Figure 1-3, in engineering, can select one or more refrigerator modules to bear actual required radiation refrigeration amount, comprise a metal framework 1-4, on described metal framework 1-4, be at least provided with a radiation refrigerator module, radiation refrigerator module is included as two galvanized steel plain sheet 1-5, and forms the mobile gap of Cooling Water between two galvanized steel plain sheet 1-5; The two ends of two described galvanized steel plain sheet 1-5 length directions are communicated with respectively cooling water water knockout drum 1-1 and cooling water water collector 1-2, and described cooling water water knockout drum 1-1 is communicated with cooling water inlet 1-7, and cooling water water collector 1-2 is communicated with coolant outlet 1-8; Width two ends adopt without rivet and press and add adhesive connection.Between galvanized steel plain sheet and the parallel face of metal framework, be provided with insulation material 1-3.
Because galvanized steel plain sheet is cheap and easy to get, thermal conductivity factor is large, and has higher emissivity at infra-red radiation wave band, therefore the radiation refrigerator module in the utility model select thickness be 1mm galvanized steel plain sheet make.In order to increase the relative area of dissipation of cooling water, between the space that two galvanized steel plain sheets that the utility model makes that cooling water is 5mm in spacing form, flow.The water collecting and diversifying device that steel plate length direction two ends are 40mm by external diameter is connected with cooling water pipeline, and width two ends adopt without rivet and press and add adhesive connection.As shown in Figure 1, on galvanized steel plain sheet, distribute some depression points 1-6 by strengthen flow disturbance strengthen the heat transfer between cooling water and steel plate.
For the solar radiation that further strengthens the irradiation space refrigeration at night and reduce daytime obtains hotly, the utility model is considered after economy coating white titanium dioxide (the infrared emittance ε ≈ 0.94 of 8～13 μ m) outside the galvanized steel plain sheet of upper strata.
In order to adapt to different radiation refrigeration amount and mounting condition, each radiation refrigerator block length can be adjusted between 1～3m, and width can be adjusted between 0.5～2m.Between each radiation refrigerator module, adopt coating steel pipe to be connected in parallel, according to waterpower calculative determination coating steel pipe caliber.
According to the characteristic of radiation heat transfer space thermal resistance, space thermal resistance minimum when radiating surface is parallel with space, radiation heat transfer performance the best.Therefore, the best mounting means of irradiation space refrigerator is to be laid on building roof.
On the other hand, the performance of irradiation space refrigerator depends on the weather conditions such as cloud thickness, ceiling of clouds, dew-point temperature.For realizing efficient operation, should open as much as possible irradiation space refrigerator at night sunny and partly cloudy and that dew-point temperature is low.If the summer cooling phase is interior because the restrictions such as weather condition fail completely uneven refrigeration duty to be got rid of by irradiation space radiator, also open in the winter time underground pipe water circulating pump and radiation refrigerator water circulating pump night in spring later heat supply phase, by its cooperation, under better weather condition, the waste heat gathering in soil is effectively drained into space.
The method for designing of the analytic solutions heat transfer model of irradiation space refrigerator is as follows:
Irradiation space refrigerator is in when operation, and cooling water is flowed into by entrance, in galvanized steel plain sheet folder interflow and mainly discharge waste heat by the radiation heat transfer between refrigerator and space, flows out after reducing self temperature.According to analysis of heat transfer, irradiation space refrigerator is adapted under condition, moving sunny or partly cloudy night.
Consider after the accuracy and practicality of computation model, the utility model on the basis of following several presupposition, set up analytic solutions heat transfer model with simulation space radiation refrigerator the operational factor under different operating modes:
(1) because change of temperature field after stable operation is relatively slow, the heat transfer of irradiation space refrigerator can be considered steady-state process.
(2) due to the existence of heat-insulation layer, can think that heat radiation and a small amount of thermal convection current only occur in the upper surface of irradiation space refrigerator, ignore other positions and conduct heat.
(3) the cooling-water duct thickness of irradiation space refrigerator inside is very little, and cooling water and heat can be thought and only propagate along water (flow) direction one dimension.
(4) the irradiation space refrigerator upper surface that has been coated with coating of titanium dioxide can be considered that infrared emittance is 0.94 grey body.
(5) because the thermal diffusion coefficient of galvanized steel plain sheet is large, the upper surface of irradiation space refrigerator can be considered isothermal surface.
Based on above-mentioned assumed condition, can derive the heat transfer expression formula of the heat loss through radiation amount between heat loss through convection amount, irradiation space refrigerator upper surface and the space of heat output, irradiation space refrigerator upper surface and surrounding air of cooling water space-ward radiation refrigerator upper surface according to heat transfer basic theories.By each heat transfer expression formula simultaneous, can obtain the refrigerating capacity of irradiation space refrigerator and the analytic solutions of coolant outlet water temperature according to the heat balance of irradiation space refrigerator.This analytic solutions heat transfer model can be used for simulation and the designing and calculating of irradiation space refrigerator, and its iterative method calculation process as shown in Figure 4, specifically comprises the following steps:
Step (1) starts;
Step (2) is obtained outdoor meteorological data, comprises air themperature Ta, relative air humidity RH, atmospheric pressure P, wind speed u
a, space infrared intensity R
is, use interpolation calculation to go out the thermal conductivity factor k of air
a, kinematic viscosity ν
awith Prandtl number Pr
a, and calculate space equivalent temperature T according to the graceful law of Si Difen-Bohr thatch
s,
σ=5.67 × 10 in formula
-8w/ (m
2k
4) be the graceful constant of Si Difen-Bohr thatch;
Step (3) is obtained the structural parameters of irradiation space refrigerator, comprises length L and the width W of irradiation space refrigerator, the thickness δ of the galvanized steel plain sheet that adopts and thermal conductivity factor k
s, and the infrared emittance ε of coating of titanium dioxide outside galvanized steel plain sheet;
Step (4) is obtained the cooling water flow m of irradiation space refrigerator;
Step (5) is calculated the cooling water flow velocity u in irradiation space refrigerator according to continuity equation
f,
u
f＝m/(L·W)；
Step (6) is obtained the cooling water inlet water temperature T of irradiation space refrigerator
fi;
Step (7) supposes that the coolant outlet water temperature of irradiation space refrigerator is T
foa;
Step (8) arranges iterations IT=0;
Step (9) is calculated cooling water mean temperature T in irradiation space refrigerator
m,
T
m＝0.5*(T
fi+T
foa)；
Step (10) is used interpolation calculation water temperature T
mthe physical property of corresponding cooling water, comprises the specific heat capacity c of cooling water
p, thermal conductivity factor k
f, kinematic viscosity ν
fwith Prandtl number Pr
f;
Step (11) is calculated the convection transfer rate h between irradiation space refrigerator upper strata galvanized steel plain sheet outside wall surface and surrounding air
1;
Step (12) is calculated the convection transfer rate h between irradiation space refrigerator upper strata galvanized steel plain sheet internal face and cooling water
2;
Step (13) is calculated the outside wall surface temperature T of irradiation space refrigerator upper strata galvanized steel plain sheet
w1;
Can obtain biquadratic equation according to energy balance:
Solve the outside wall surface temperature T that can obtain irradiation space refrigerator upper strata galvanized steel plain sheet
w1:
Being calculated as follows of k and l in above formula:
In formula,
Step (14) is calculated the coolant outlet water temperature T of irradiation space refrigerator
fo;
Step (15) judgement | T
fo-T
foa| whether be less than permissible value; If so, export the operational factor (coolant outlet water temperature and radiation refrigeration amount) of irradiation space refrigerator, out of service; If not, reset Tfoa=0.5* (Tfo+Tfoa); IT=IT+1; Turn back to step (9), continue circulation.
Meaning of parameters is as follows:
C
pspecific heat capacity (the J kg of cooling water
-1k
-1);
H
1convection transfer rate (W m between irradiation space refrigerator upper strata outside wall surface and surrounding air
-2k
-1);
H
2convection transfer rate (W m between irradiation space refrigerator upper strata internal face and cooling water
-2k
-1);
IT iterations;
K
athermal conductivity factor (the W m of air
-1k
-1);
K
fthermal conductivity factor (the W m of cooling water
-1k
-1);
K
sthermal conductivity factor (the W m of galvanized steel plain sheet
-1k
-1);
The length (m) of L irradiation space refrigerator;
The cooling water flow (kg/s) of m irradiation space refrigerator;
P atmospheric pressure (Pa);
Pr
athe Prandtl number of air;
Pr
fthe Prandtl number of cooling water;
RH relative air humidity (%);
R
isspace infrared intensity (W m
-2);
T
aair themperature (K);
T
fithe cooling water inlet water temperature (K) of irradiation space radiator;
T
fothe coolant outlet water temperature (K) of irradiation space refrigerator;
T
foathe coolant outlet water temperature default (K) of irradiation space refrigerator;
T
mcooling water mean temperature (K) in irradiation space radiator;
T
sspace equivalent temperature (K);
T
w1the outside wall surface temperature (K) of irradiation space refrigerator upper strata galvanized steel plain sheet;
U
aoutdoor wind speed (m s
-1);
U
fcooling water flow velocity (m s in irradiation space radiator
-1);
The width (m) of W irradiation space refrigerator;
The thickness (m) of δ galvanized steel plain sheet;
The infrared emittance of coating of titanium dioxide outside ε galvanized steel plain sheet;
The graceful constant of σ Si Difen-Bohr thatch;
ν
akinematic viscosity (the m of air
2s
-1);
ν
fkinematic viscosity (the m of cooling water
2s
-1).
Utilize the buried pipe ground-source heat pump system of the coupling irradiation space refrigeration of irradiation space refrigerator formation
The target of optimizing for realizing the cold and hot balance of annual underground environment and energy saving of system, the utility model adopts ground heat exchanger to bear the be dominant hot and cold load of the annual balance of type building of refrigeration duty in the time of the buried pipe ground-source heat pump system of design coupling irradiation space refrigeration, adopts irradiation space refrigerator to bear remaining uneven refrigeration duty.
As shown in Figure 5, whole system comprise be arranged at building roof 18 irradiation space refrigerator 1, be arranged at the source pump in building and be embedded in the ground heat exchanger 6 under building ground 15, and irradiation space refrigerator is coupled in buried pipe ground-source heat pump system to the connected mode of cooling water pipeline in system: the outlet of described irradiation space refrigerator 1 is communicated with the entrance of irradiation space refrigerator 1 successively after reflux tank 2 and heat exchanger 4; The outlet of described ground heat exchanger 6 is communicated with the entrance of source pump heat exchanger I8 all the time after underground pipe water circulating pump; The outlet of source pump heat exchanger I8 is communicated with the entrance of heat exchanger 4 or the entrance of ground heat exchanger 6 respectively, and on the pipeline being communicated with heat exchanger 4 entrances at source pump heat exchanger I8, be provided with the valve II5 ' that only refrigeration is opened at night, on the pipeline being communicated with the entrance of ground heat exchanger 6 at source pump heat exchanger I8, be provided with only at the valve I5 closing that freezes at night; Meanwhile, source pump heat exchanger I8 is communicated with expansion mechanism I9, source pump heat exchanger II10, compressor 12 and desuperheater 13 successively by refrigerant loop again.
In addition; In dotted line frame, single arrow represents the refrigerant flow direction of cooling operating mode source pump, and double-head arrow represents the refrigerant flow direction for thermal condition source pump.
At source pump heat exchanger II10, the refrigerant line that source pump heat exchanger I8 is communicated with is provided with and is also provided with the expansion structure II9 ' in parallel with expansion structure I9.Series circulation water pump 3, temperature sensor 19 on the connecting pipe of the outlet of irradiation space refrigerator 1 and plate type heat exchanger 4, be in series with temperature sensor 19 on the entrance connecting pipeline of plate type heat exchanger 4 and ground heat exchanger.
On the entrance connecting line of the outlet of ground heat exchanger and source pump heat exchanger I8, be in series with underground pipe water circulating pump 7, temperature sensor 19.In the outlet of source pump heat exchanger I8 and the entrance connecting pipe of heat exchanger, be in series with temperature sensor 19, flow sensor 20, control valve I5; And the outlet of source pump heat exchanger I8 is communicated with the entrance of ground heat exchanger 6, is provided with control valve II5 ' on the pipeline of its connection.Described desuperheater 13 is communicated with domestic hot-water's case 14.Described source pump heat exchanger II10 is connected on user's side circulating water line, by cold-producing medium and user's side recirculated water, the exchange heat in source pump heat exchanger II10 realizes Winter heat supply and the summer cooling to air-conditioned room 17, is provided with user's side water circulating pump 11, temperature sensor 19, flow sensor 20 on user's side circulating water line.
Wherein the desuperheater of source pump can utilize the required domestic hot-water of condensation heat extraction production building of cold-producing medium, makes a living to apply flexibly hot water facility 16 domestic hot-water is provided; So not only freely obtain domestic hot-water, can also reduce the uneven degree of building cooling and heating load.Irradiation space refrigerator forms auxiliary radiating device together with plate type heat exchanger with reflux tank, connect and compose the whole cooling water loop of source pump with ground heat exchanger.
When Winter heat supply operating mode, irradiation space refrigerator 1 is not worked, and valve I5 opens, and valve II5 ' closes; The high-temperature high-pressure refrigerant that source pump compressor 12 exports first in desuperheater to domestic hot-water's heat release, then enter the source pump heat exchanger II10 as condenser, by heat medium water to conditioned space heat supply in building, after expansion mechanism II9 ', enter the source pump heat exchanger I8 as evaporimeter, absorb heat by the recirculated water in ground heat exchanger from soil;
When summer cooling operating mode is moved daytime, irradiation space refrigerator 1 is not worked, and now valve I5 opens, and valve II5 ' closes; The high-temperature high-pressure refrigerant that source pump compressor 12 exports first in desuperheater to domestic hot-water's heat release, then enter as the source pump heat exchanger I8 of condenser by the recirculated water in ground heat exchanger to soil release heat, with after after decompressor I9, enter as the source pump heat exchanger II10 of evaporimeter by chilled water to air-conditioned room 17 coolings in building;
While moving irradiation space refrigerator 1 night, irradiation space refrigerator 1 is worked, valve I5 closes, valve II5 ' opens, irradiation space kind of refrigeration cycle water pump is opened, make cooling water flow through being installed on the irradiation space refrigerator 1 on roof, discharge uneven part building cooling load by radiation heat transfer space-ward; Irradiation space refrigerator out of service after sunrise on daytime, Open valve I5, valve-off II5 ', closes irradiation space kind of refrigeration cycle water pump, make cooling water in irradiation space refrigerator at Action of Gravity Field downstream to reflux tank.
As whole system is while continuing the continuous service condition of cooling night, after the high-temperature cooling water being flowed out by source pump condenser is first taken away part heat via plate type heat exchanger by irradiation space refrigerator, inflow place buried tube heat exchanger continues to soil heat release.If whole system is while stopping the intermittent duty condition of cooling night, only underground pipe water circulating pump and radiation refrigerator water circulating pump cooperation, get rid of the heat gathering in soil by irradiation space refrigerator.
Irradiation space refrigerator 1 out of service after sunrise on daytime, Open valve I5, valve-off II5 ', closes irradiation space kind of refrigeration cycle water pump, make cooling water in irradiation space refrigerator at Action of Gravity Field downstream to reflux tank.During out of service by day, irradiation space radiator inside be anhydrous state to reduce the thermal capacity of radiator, increase the radiator efficiently radiates heat amount at night.
The performance of irradiation space refrigerator raises with the increase of its internal cooling water flow velocity, but the excessive energy consumption that can increase again water circulating pump of flow velocity, therefore has the cooling water economic velocity of irradiation space refrigerator.Through simulation relatively, generally under operating mode, this economic velocity is 0.5kg/s left and right.On the other hand, the performance of irradiation space refrigerator depends on the weather conditions such as cloud thickness, ceiling of clouds, dew-point temperature.For realizing efficient operation, should open as much as possible irradiation space refrigerator at night sunny and partly cloudy and that dew-point temperature is low.If the summer cooling phase is interior because the restrictions such as weather condition fail completely uneven refrigeration duty to be got rid of by irradiation space radiator, also open in the winter time underground pipe water circulating pump and radiation refrigerator water circulating pump night in spring later heat supply phase, by its cooperation, under better weather condition, the waste heat gathering in soil is effectively drained into space.
Heat exchange amount calibration equipment
As shown in Figure 5, system has been installed temperature and flow sensor, be respectively used to metering user side heat exchange amount, irradiation space refrigerator heat exchange amount and ground heat exchanger heat exchange amount, the practical operation situation being dominant in type building in refrigeration duty to control the buried pipe ground-source heat pump system of the passive type irradiation space refrigeration that has been coupled.
For verifying the whether cold and hot balance of annual underground environment, the heat exchange amount calibration equipment of system setting comprises the thermal resistance temperature sensor of measuring ground heat exchanger gateway water temperature, and measures the turbine flow transducer of circulating water flow.The signal of these sensor collections is admitted to after changing by A/D and in microcomputer, calculates cold and hot amount.When inlet water temperature is lower than outlet when water temperature, accumulative total enters the heat extracting from soil winter; When inlet water temperature is higher than outlet when water temperature, accumulative total enters to enter the heat of soil summer.Move the size of (through a confession hot season and a confession cold season) cold and hot amount accumulative total numerical value after 1 year by comparison system and judge the cold and hot balance of underground environment.
Claims (8)
1. the buried pipe ground-source heat pump system of coupling passive type irradiation space refrigeration, it is characterized in that: comprise with irradiation space refrigerator, the source pump of infrared emanation mode release heat and be embedded in the ground heat exchanger in soil, and irradiation space refrigerator is coupled in buried pipe ground-source heat pump system to the connected mode of cooling water pipeline in system: the outlet of described irradiation space refrigerator is communicated with the entrance of irradiation space refrigerator successively after reflux tank, heat exchanger; The outlet of described ground heat exchanger is communicated with the entrance of source pump heat exchanger I all the time after underground pipe water circulating pump; The outlet of source pump heat exchanger I is communicated with the entrance of heat exchanger or the entrance of ground heat exchanger respectively, and on the pipeline being communicated with heat exchanger entrance at source pump heat exchanger I, be provided with the valve II that only refrigeration is opened at night, on the pipeline being communicated with the entrance of ground heat exchanger at source pump heat exchanger I, be provided with only at the valve I closing that freezes at night; Meanwhile, source pump heat exchanger I is communicated with expansion mechanism I, source pump heat exchanger II, compressor and desuperheater successively by refrigerant loop again.
2. the buried pipe ground-source heat pump system of coupling passive type irradiation space refrigeration as claimed in claim 1, it is characterized in that: described irradiation space refrigerator comprises a framework, on described framework, be provided with one or more radiation refrigerator modules, described radiation refrigerator module comprises two metallic plates for heat conduction; And between two metallic plates, form the mobile gap of Cooling Water; The two ends of two described metallic plate length directions are communicated with respectively cooling water water knockout drum and cooling water water collector, and metallic plate width two ends directly connect; And described cooling water water knockout drum is communicated with cooling water inlet, and cooling water water collector is communicated with coolant outlet.
3. the buried pipe ground-source heat pump system of coupling passive type irradiation space refrigeration as claimed in claim 2, is characterized in that: described metallic plate is galvanized steel plain sheet, is provided with the pitting of regular distribution on described galvanized steel plain sheet; Between galvanized steel plain sheet and the parallel face of metal framework, be provided with insulation material.
4. the buried pipe ground-source heat pump system of coupling passive type irradiation space refrigeration as claimed in claim 2, is characterized in that: when described radiation refrigerator module is polylith, between radiation refrigerator module, adopt coating steel pipe to be connected in parallel.
5. the buried pipe ground-source heat pump system of coupling passive type irradiation space refrigeration as claimed in claim 1, is characterized in that: described source pump heat exchanger I is condenser in the time of cooling operating mode, during for thermal condition, is evaporimeter; When described source pump heat exchanger II cooling operating mode, being evaporimeter, is condenser during for thermal condition.
6. the buried pipe ground-source heat pump system of coupling passive type irradiation space refrigeration as claimed in claim 1, is characterized in that: at source pump heat exchanger II, on the pipeline that source pump heat exchanger I is communicated with, be also provided with the expansion mechanism II in parallel with expansion structure I; Described source pump heat exchanger II is connected on user's side circulating water line, exchange heat by cold-producing medium and user's side recirculated water realizes Winter heat supply and the summer cooling to air-conditioned room, on user's side circulating water line, is provided with chilled water water circulating pump, temperature sensor, flow sensor.
7. the buried pipe ground-source heat pump system of coupling passive type irradiation space refrigeration as claimed in claim 1, is characterized in that: series circulation water pump, temperature sensor on the described outlet of irradiation space refrigerator and the connecting pipe of heat exchanger; On the entrance connecting pipeline of described heat exchanger and ground heat exchanger, be in series with temperature sensor; On the entrance connecting line of the outlet of described ground heat exchanger and source pump heat exchanger I, be in series with underground pipe water circulating pump, temperature sensor.
8. the buried pipe ground-source heat pump system of coupling passive type irradiation space refrigeration as claimed in claim 1, is characterized in that: in the described outlet of source pump heat exchanger I8 and the entrance connecting pipe of heat exchanger, be in series with temperature sensor, flow sensor, control valve I5; And the outlet of source pump heat exchanger I8 is communicated with the entrance of ground heat exchanger, is provided with control valve II5 on the pipeline of its connection.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103925735A (en) * | 2014-03-28 | 2014-07-16 | 山东中瑞新能源科技有限公司 | System and method for coupling passive space radiation refrigeration with buried-pipe ground-source heat pump |
| CN104279662A (en) * | 2014-09-22 | 2015-01-14 | 广东技术师范学院 | Cold and heat combined supply water-loop heat pump air conditioning system and realizing method thereof |
| CN104976839A (en) * | 2015-06-26 | 2015-10-14 | 西安建筑科技大学 | Ground water source heat pump system and method with energy-saving operation mode of water source side switchable |
| CN112303827A (en) * | 2020-10-30 | 2021-02-02 | 青岛海尔空调电子有限公司 | Control method of combined air-conditioning system |
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2014
- 2014-03-28 CN CN201420148281.0U patent/CN203824152U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103925735A (en) * | 2014-03-28 | 2014-07-16 | 山东中瑞新能源科技有限公司 | System and method for coupling passive space radiation refrigeration with buried-pipe ground-source heat pump |
| CN103925735B (en) * | 2014-03-28 | 2016-07-06 | 山东中瑞新能源科技有限公司 | The buried pipe ground-source heat pump system of coupling passive type irradiation space refrigeration and method |
| CN104279662A (en) * | 2014-09-22 | 2015-01-14 | 广东技术师范学院 | Cold and heat combined supply water-loop heat pump air conditioning system and realizing method thereof |
| CN104279662B (en) * | 2014-09-22 | 2017-04-19 | 广东技术师范学院 | Cold and heat combined supply water-loop heat pump air conditioning system and realizing method thereof |
| CN104976839A (en) * | 2015-06-26 | 2015-10-14 | 西安建筑科技大学 | Ground water source heat pump system and method with energy-saving operation mode of water source side switchable |
| CN112303827A (en) * | 2020-10-30 | 2021-02-02 | 青岛海尔空调电子有限公司 | Control method of combined air-conditioning system |
| CN112303827B (en) * | 2020-10-30 | 2022-05-20 | 青岛海尔空调电子有限公司 | Control method of combined air-conditioning system |
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