CN103884064A - Space radiation refrigerator used as auxiliary cold source and heat transfer modeling method - Google Patents

Abstract

The invention discloses a space radiation refrigerator used as an auxiliary cold source and a heat transfer modeling method. The space radiation refrigerator comprises a metal frame which is provided with one or more radiation refrigerator modules, each radiation refrigerator module comprises two zinc-plated steel plates, and a gap for flowing of cooling water is formed between every two zinc-plated steel plates; the two ends of each zinc-plated steel plate in the length direction are communicated with a cooling water separator and a cooling water collector respectively, the cooling water separator is communicated with a cooling water inlet, and the cooling water collector is communicated with a cooling water outlet; the two ends of each zinc-plated steel plate in the width direction are connected. The space radiation refrigerator can be connected with other stable cold sources of a water source heat pump system in series or parallel for use under the optimal weather condition, and cold energy is provided for the heat pump system together.

Description

A kind of irradiation space refrigerator as auxiliary cold source and heat transfer modeling method

Technical field

What the present invention relates to is a kind of irradiation space refrigerator as auxiliary cold source and heat transfer modeling method, belongs 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 ground source heat pump technology 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;

Research about irradiation space refrigerator is few in number, and is all applied to the passive type refrigeration of building.Form is to adopt common flat type solar heat collector operation at night to double as a radiation refrigerator, and its refrigerating efficiency is very low; Another kind of form is that the baroque refrigerator of specialized designs carries out long-wave radiation at night, and its refrigerating efficiency increases but processing and fabricating expense is higher.Owing to existing intrinsic limitation, existing irradiation space refrigerator is not suitable as the stable low-temperature receiver of the active refrigeration system of building.First, the refrigeration usefulness of irradiation space refrigerator is not mated with building refrigeration duty, and it is afternoon that the peak value of building refrigeration duty appears at summer, however the refrigeration performance of irradiation space refrigerator in the winter time night best.Secondly, the refrigerating efficiency of irradiation space refrigerator is subject to the impact of outdoor air relative humidity, sky cloud thickness and air purity larger, refrigerating capacity less stable.Again, the energy-flux density of irradiation space refrigerator is not high, and the refrigeration work consumption of unit are is little, therefore needs to take larger building roof area.

Summary of the invention

The limitation existing in order to overcome prior art, utilizing the effective means of passive type irradiation space refrigeration is the auxiliary cold source that sets it as active refrigeration system.Therefore, the present invention is directed to the active refrigeration form of " water source heat pump system " this most frequently used building, designed within the scope of source pump cooling water temperature that radiation refrigeration efficiency is higher, processing is simple and manufacture the cheap a kind of irradiation space refrigerator as auxiliary cold source of maintenance cost.This kind of irradiation space refrigerator can be under meteorological optimum and other stable low-temperature receiver use connected in series or in parallel of water source heat pump system, jointly for heat pump provides cold.In order to facilitate the designing and calculating of this kind of irradiation space refrigerator, the present invention proposes corresponding heat transfer modeling method.

The technical solution used in the present invention is as follows:

As an irradiation space refrigerator for auxiliary cold source, comprise 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.

Described metallic plate is galvanized steel plain sheet; Metallic plate width two ends adopt without rivet and press and add adhesive connection.

When described radiation refrigerator module is polylith, between radiation refrigerator module, be connected in parallel.

Described framework is metal framework, between the face paralleling, is provided with insulation material in metal framework and radiation refrigerator module.

Spacing between two described galvanized steel plain sheets is 5mm.

On described galvanized steel plain sheet, be provided with the pitting of regular distribution, cross arrangement, spacing 5cm.

For further strengthen night infrared emissivity and daytime solar radiation reflectivity, coating white titanium dioxide outside the galvanized steel plain sheet that is positioned at upper strata face.

The best mounting means of described irradiation space refrigerator is to be laid on building roof.

The heat transfer modeling method of the heat dissipation capacity of described irradiation space refrigerator, comprises the following steps:

Step (1) starts;

Step (2) is obtained outdoor meteorological data, comprises air themperature T _a, 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 cooler according to continuity equation _f,

u _f＝m/(L·W)；

Step (6) is obtained the cooling water inlet water temperature T of irradiation space radiator _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 radiator _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;

${\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="HDA0000484133450000011.png"\; state="\{\{state\}\}">h</figure-callout>}}_1=0.664\&CenterDot;k_a\&CenterDot;{\left(\frac{u_a}{v_a\&CenterDot;L}\right)}^{1/2}\text{\&CenterDot;}{{\mathrm{Pr}}_{\mathrm{<figure-callout\; id="1"\; label="a"\; filenames="HDA0000484133450000011.png"\; state="\{\{state\}\}">a</figure-callout>}}}^{1/3}$

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;

${\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="HDA0000484133450000011.png,HDA0000484133450000041.png"\; state="\{\{state\}\}">h</figure-callout>}}_2=0.664\&CenterDot;k_f\&CenterDot;{\left(\frac{u_f}{v_f\&CenterDot;L}\right)}^{1/2}\&CenterDot;{{\mathrm{Pr}}_{\mathrm{<figure-callout\; id="1"\; label="f"\; filenames="HDA0000484133450000011.png"\; state="\{\{state\}\}">f</figure-callout>}}}^{1/3}$

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:

$\mathrm{\&epsiv;}\&CenterDot;\mathrm{\&sigma;}\&CenterDot;T_{\mathrm{wl}}^4+({\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="HDA0000484133450000011.png"\; state="\{\{state\}\}">h</figure-callout>}}_1+\frac{{\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="HDA0000484133450000011.png,HDA0000484133450000041.png"\; state="\{\{state\}\}">h</figure-callout>}}_2}{1+\frac{\mathrm{\&delta;}}{{\mathrm{<figure-callout\; id="2"\; label="k"\; filenames="HDA0000484133450000011.png,HDA0000484133450000041.png"\; state="\{\{state\}\}">k</figure-callout>}}_2}{\&CenterDot;h}_2})\&CenterDot;T_{\mathrm{wl}}=\mathrm{\&epsiv;}\&CenterDot;\mathrm{\&sigma;}\&CenterDot;{T_s}^4+{\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="HDA0000484133450000011.png"\; state="\{\{state\}\}">h</figure-callout>}}_1{\&CenterDot;T}_a+(h_2-\frac{\frac{\mathrm{\&delta;}}{k_s}\&CenterDot;{{\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="HDA0000484133450000011.png,HDA0000484133450000041.png"\; state="\{\{state\}\}">h</figure-callout>}}_2}^2}{1+\frac{\mathrm{\&delta;}}{k_s}\&CenterDot;h_2})\&CenterDot;T_m$

Solve the outside wall surface temperature T that can obtain irradiation space refrigerator upper strata galvanized steel plain sheet _w1:

$T_{\mathrm{wl}}=\frac{-k+\sqrt{k^2-4\mathrm{<figure-callout\; id="2"\; label="l"\; filenames="HDA0000484133450000011.png,HDA0000484133450000041.png"\; state="\{\{state\}\}">l</figure-callout>}}}{2}$

Being calculated as follows of k and l in above formula:

$k={[\frac{4r}{3}{\left(\frac{{\mathrm{<figure-callout\; id="2"\; label="q"\; filenames="HDA0000484133450000011.png,HDA0000484133450000041.png"\; state="\{\{state\}\}">q</figure-callout>}}^2+\sqrt{q^4-\frac{256}{27}{r}^3}}{2}\right)}^{-\frac{1}{3}}+{\left(\frac{{\mathrm{<figure-callout\; id="2"\; label="q"\; filenames="HDA0000484133450000011.png,HDA0000484133450000041.png"\; state="\{\{state\}\}">q</figure-callout>}}^2+\sqrt{q^4-\frac{256}{27}{r}^3}}{2}\right)}^{\frac{1}{3}}]}^{\frac{1}{2}},l=\frac{k^3-q}{2k}$

In formula $q=\frac{B}{A},r=-\frac{C}{A}$

$A=\mathrm{\&epsiv;}\&CenterDot;\mathrm{\&sigma;},B={\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="HDA0000484133450000011.png"\; state="\{\{state\}\}">h</figure-callout>}}_1+\frac{{\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="HDA0000484133450000011.png,HDA0000484133450000041.png"\; state="\{\{state\}\}">h</figure-callout>}}_2}{1+\frac{\mathrm{\&delta;}}{k_s}\&CenterDot;{\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="HDA0000484133450000011.png,HDA0000484133450000041.png"\; state="\{\{state\}\}">h</figure-callout>}}_2},C=\mathrm{\&epsiv;}\&CenterDot;\mathrm{\&sigma;}\&CenterDot;{T_s}^4+{\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="HDA0000484133450000011.png"\; state="\{\{state\}\}">h</figure-callout>}}_1\&CenterDot;T_a+(h_2-\frac{\frac{\mathrm{\&delta;}}{k_s}\&CenterDot;{{\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="HDA0000484133450000011.png,HDA0000484133450000041.png"\; state="\{\{state\}\}">h</figure-callout>}}_2}^2}{1+\frac{\mathrm{\&delta;}}{k_s}\&CenterDot;h_2})\&CenterDot;T_m$

Step (14) is calculated the coolant outlet water temperature T of irradiation space refrigerator _fo;

$T_{\mathrm{fo}}=\frac{\frac{\mathrm{\&delta;}}{k_s}\&CenterDot;{\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="HDA0000484133450000011.png,HDA0000484133450000041.png"\; state="\{\{state\}\}">h</figure-callout>}}_2\&CenterDot;T_m+{\mathrm{<figure-callout\; id="1"\; label="T\; wl"\; filenames="HDA0000484133450000011.png"\; state="\{\{state\}\}">T</figure-callout>}}_{\mathrm{wl}}}{1+\frac{\mathrm{\&delta;}}{k_s}\&CenterDot;{\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="HDA0000484133450000011.png,HDA0000484133450000041.png"\; state="\{\{state\}\}">h</figure-callout>}}_2}+\frac{T_{\mathrm{fi}}-\frac{\frac{\mathrm{\&delta;}}{k_s}\&CenterDot;{\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="HDA0000484133450000011.png,HDA0000484133450000041.png"\; state="\{\{state\}\}">h</figure-callout>}}_2\&CenterDot;T_m+{\mathrm{<figure-callout\; id="1"\; label="T\; wl"\; filenames="HDA0000484133450000011.png"\; state="\{\{state\}\}">T</figure-callout>}}_{\mathrm{wl}}}{1+\frac{\mathrm{\&delta;}}{k_s}\&CenterDot;{\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="HDA0000484133450000011.png,HDA0000484133450000041.png"\; state="\{\{state\}\}">h</figure-callout>}}_2}}{\exp \left(\frac{L\&CenterDot;W\&CenterDot;h_2}{m\&CenterDot;c_p}\right)}$

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.

Symbol implication is as follows:

C _p: specific heat capacity (the J k of cooling water _g ^-1k ^-1);

H ₁: convection transfer rate (the W m between irradiation space refrigerator upper strata outside wall surface and surrounding air ^-2k ^-1);

H ₂: convection transfer rate (the W m between irradiation space refrigerator upper strata internal face and cooling water ^-2k ^-1);

IT: iterations;

K _a: thermal conductivity factor (the W m of air ^-1k ^-1);

K _f: thermal conductivity factor (the W m of cooling water ^-1k ^-1);

K _s: thermal conductivity factor (the W m of galvanized steel plain sheet ^-1k ^-1);

L: the length (m) of irradiation space refrigerator;

M: the cooling water flow (kg/s) of irradiation space refrigerator;

P: atmospheric pressure (Pa);

Pr _a: the Prandtl number of air;

Pr _f: the Prandtl number of cooling water;

RH: relative air humidity (%);

R _is: space infrared intensity (W m ^-2);

T _a: air themperature (K);

T _fi: the cooling water inlet water temperature (K) of irradiation space radiator;

T _fo: the coolant outlet water temperature (K) of irradiation space refrigerator;

T _foa: the coolant outlet water temperature default (K) of irradiation space refrigerator;

T _m: cooling water mean temperature (K) in irradiation space radiator;

T _s: space equivalent temperature (K);

T _w1: the outside wall surface temperature (K) of irradiation space refrigerator upper strata galvanized steel plain sheet;

U _a: outdoor wind speed (ms ^-1);

U _f: the cooling water flow velocity (ms in irradiation space radiator ^-1);

W: the width (m) of irradiation space refrigerator;

δ: the thickness (m) of galvanized steel plain sheet;

ε: the infrared emittance of coating of titanium dioxide outside galvanized steel plain sheet;

σ: the graceful constant of Si Difen-Bohr thatch;

ν _a: the kinematic viscosity (m of air ²s ^-1);

ν _f: the kinematic viscosity (m of cooling water ²s ^-1);

Beneficial effect of the present invention is as follows:

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 present invention 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 present invention 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.

Some depression points that distribute on galvanized steel plain sheet are strengthened the heat transfer between cooling water and steel plate by strengthening flow disturbance.

For the solar radiation that further strengthens the irradiation space refrigeration at night and reduce daytime obtains hotly, the present invention considers 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.

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.

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 invention 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 present invention 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 present invention 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 present invention considers 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 present invention 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;

${\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="HDA0000484133450000011.png"\; state="\{\{state\}\}">h</figure-callout>}}_1=0.664\&CenterDot;k_a\&CenterDot;{\left(\frac{u_a}{v_a\&CenterDot;L}\right)}^{1/2}\text{\&CenterDot;}{{\mathrm{Pr}}_a}^{1/3}$

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;

${\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="HDA0000484133450000011.png,HDA0000484133450000041.png"\; state="\{\{state\}\}">h</figure-callout>}}_2=0.664\&CenterDot;k_f\&CenterDot;{\left(\frac{u_f}{v_f\&CenterDot;L}\right)}^{1/2}\&CenterDot;{{\mathrm{<figure-callout\; id="1"\; label="Pr\; f"\; filenames="HDA0000484133450000011.png"\; state="\{\{state\}\}">Pr</figure-callout>}}_f}^{1/3}$

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:

$\mathrm{\&epsiv;}\&CenterDot;\mathrm{\&sigma;}\&CenterDot;T_{\mathrm{wl}}^4+({\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="HDA0000484133450000011.png"\; state="\{\{state\}\}">h</figure-callout>}}_1+\frac{{\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="HDA0000484133450000011.png,HDA0000484133450000041.png"\; state="\{\{state\}\}">h</figure-callout>}}_2}{1+\frac{\mathrm{\&delta;}}{k_2}{\&CenterDot;h}_2})\&CenterDot;T_{\mathrm{wl}}=\mathrm{\&epsiv;}\&CenterDot;\mathrm{\&sigma;}\&CenterDot;{T_s}^4+{\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="HDA0000484133450000011.png"\; state="\{\{state\}\}">h</figure-callout>}}_1{\&CenterDot;T}_a+(h_2-\frac{\frac{\mathrm{\&delta;}}{k_s}\&CenterDot;{{\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="HDA0000484133450000011.png,HDA0000484133450000041.png"\; state="\{\{state\}\}">h</figure-callout>}}_2}^2}{1+\frac{\mathrm{\&delta;}}{k_s}\&CenterDot;h_2})\&CenterDot;T_m$

Solve the outside wall surface temperature T that can obtain irradiation space refrigerator upper strata galvanized steel plain sheet _w1:

$T_{\mathrm{wl}}=\frac{-k+\sqrt{k^2-4\mathrm{<figure-callout\; id="2"\; label="l"\; filenames="HDA0000484133450000011.png,HDA0000484133450000041.png"\; state="\{\{state\}\}">l</figure-callout>}}}{2}$

Being calculated as follows of k and l in above formula:

$\begin{array}{c}k={[\frac{4r}{3}{\left(\frac{{\mathrm{<figure-callout\; id="2"\; label="q"\; filenames="HDA0000484133450000011.png,HDA0000484133450000041.png"\; state="\{\{state\}\}">q</figure-callout>}}^2+\sqrt{q^4-\frac{256}{27}{r}^3}}{2}\right)}^{-\frac{1}{3}}+{\left(\frac{{\mathrm{<figure-callout\; id="2"\; label="q"\; filenames="HDA0000484133450000011.png,HDA0000484133450000041.png"\; state="\{\{state\}\}">q</figure-callout>}}^2+\sqrt{q^4-\frac{256}{27}{r}^3}}{2}\right)}^{\frac{1}{3}}]}^{\frac{1}{2}},\end{array}jl=\frac{k^3-q}{2k}$

In formula, $q=\frac{B}{A},r=-\frac{C}{A}$

$A=\mathrm{\&epsiv;}\&CenterDot;\mathrm{\&sigma;},B={\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="HDA0000484133450000011.png"\; state="\{\{state\}\}">h</figure-callout>}}_1+\frac{{\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="HDA0000484133450000011.png,HDA0000484133450000041.png"\; state="\{\{state\}\}">h</figure-callout>}}_2}{1+\frac{\mathrm{\&delta;}}{k_s}\&CenterDot;{\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="HDA0000484133450000011.png,HDA0000484133450000041.png"\; state="\{\{state\}\}">h</figure-callout>}}_2},C=\mathrm{\&epsiv;}\&CenterDot;\mathrm{\&sigma;}\&CenterDot;{T_s}^4+{\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="HDA0000484133450000011.png"\; state="\{\{state\}\}">h</figure-callout>}}_1\&CenterDot;T_a+(h_2-\frac{\frac{\mathrm{\&delta;}}{k_s}\&CenterDot;{{\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="HDA0000484133450000011.png,HDA0000484133450000041.png"\; state="\{\{state\}\}">h</figure-callout>}}_2}^2}{1+\frac{\mathrm{\&delta;}}{k_s}\&CenterDot;h_2})\&CenterDot;T_m$

Step (14) is calculated the coolant outlet water temperature T of irradiation space refrigerator _fo;

$T_{\mathrm{fo}}=\frac{\frac{\mathrm{\&delta;}}{k_s}\&CenterDot;{\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="HDA0000484133450000011.png,HDA0000484133450000041.png"\; state="\{\{state\}\}">h</figure-callout>}}_2\&CenterDot;T_m+{\mathrm{<figure-callout\; id="1"\; label="T\; wl"\; filenames="HDA0000484133450000011.png"\; state="\{\{state\}\}">T</figure-callout>}}_{\mathrm{wl}}}{1+\frac{\mathrm{\&delta;}}{k_s}\&CenterDot;{\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="HDA0000484133450000011.png,HDA0000484133450000041.png"\; state="\{\{state\}\}">h</figure-callout>}}_2}+\frac{T_{\mathrm{fi}}-\frac{\frac{\mathrm{\&delta;}}{k_s}\&CenterDot;{\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="HDA0000484133450000011.png,HDA0000484133450000041.png"\; state="\{\{state\}\}">h</figure-callout>}}_2\&CenterDot;T_m+{\mathrm{<figure-callout\; id="1"\; label="T\; wl"\; filenames="HDA0000484133450000011.png"\; state="\{\{state\}\}">T</figure-callout>}}_{\mathrm{wl}}}{1+\frac{\mathrm{\&delta;}}{k_s}\&CenterDot;{\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="HDA0000484133450000011.png,HDA0000484133450000041.png"\; state="\{\{state\}\}">h</figure-callout>}}_2}}{\exp \left(\frac{L\&CenterDot;W\&CenterDot;h_2}{m\&CenterDot;c_p}\right)}$

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 Jkg of cooling water ^-1k ^-1);

H ₁convection transfer rate (Wm between irradiation space refrigerator upper strata outside wall surface and surrounding air ^-2k ^-1);

H ₂convection transfer rate (Wm between irradiation space refrigerator upper strata internal face and cooling water ^-2k ^-1);

IT iterations;

K _athermal conductivity factor (the Wm of air ^-1k ^-1);

K _fthermal conductivity factor (the Wm of cooling water ^-1k ^-1);

K _sthermal conductivity factor (the Wm 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 (Wm ^-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 (ms ^-1);

U _fcooling water flow velocity (ms 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 present invention 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 (10)

1. as an irradiation space refrigerator for auxiliary cold source, it is characterized in that: comprise a framework, be provided with one or more radiation refrigerator modules on described framework, 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 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 connect.

2. irradiation space refrigerator as claimed in claim 1, is characterized in that: described width two ends adopt without rivet and press and add adhesive connection.

3. irradiation space refrigerator as claimed in claim 1, is characterized in that: when described radiation refrigerator module is polylith, between radiation refrigerator module, be connected in parallel.

4. irradiation space refrigerator as claimed in claim 1, is characterized in that: between the face paralleling in metal framework and radiation refrigerator module, be provided with insulation material.

5. irradiation space refrigerator as claimed in claim 1, is characterized in that: described metallic plate is galvanized steel plain sheet, and the spacing between two described galvanized steel plain sheets is 5mm.

6. irradiation space refrigerator as claimed in claim 5, is characterized in that: the pitting that is provided with regular distribution on described galvanized steel plain sheet.

7. irradiation space refrigerator as claimed in claim 5, is characterized in that: coating white titanium dioxide outside the galvanized steel plain sheet that is positioned at upper strata face.

8. irradiation space refrigerator as claimed in claim 1, is characterized in that: the best mounting means of described irradiation space refrigerator is to be laid on building roof.

9. the heat transfer modeling method of irradiation space refrigerator as claimed in claim 1, is characterized in that, as follows:

Step (1) starts;

Step (2) is obtained outdoor meteorological data, comprises air themperature T _a, 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 cooler according to continuity equation _f,

u _f＝m/(L·W)；

Step (6) is obtained the cooling water inlet water temperature T of irradiation space radiator _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 radiator _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;

$h_1=0.664\&CenterDot;k_a\&CenterDot;{\left(\frac{u_a}{v_a\&CenterDot;L}\right)}^{1/2}\text{\&CenterDot;}{{\mathrm{Pr}}_a}^{1/3}$

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;

$h_2=0.664\&CenterDot;k_f\&CenterDot;{\left(\frac{u_f}{v_f\&CenterDot;L}\right)}^{1/2}\&CenterDot;{{\mathrm{Pr}}_f}^{1/3}$

Step (13) is calculated the outside wall surface temperature T of irradiation space refrigerator upper strata galvanized steel plain sheet _w1;

Step (14) is calculated the coolant outlet water temperature T of irradiation space refrigerator _fo;

$T_{\mathrm{fo}}=\frac{\frac{\mathrm{\&delta;}}{k_s}\&CenterDot;h_2\&CenterDot;T_m+T_{\mathrm{wl}}}{1+\frac{\mathrm{\&delta;}}{k_s}\&CenterDot;h_2}+\frac{T_{\mathrm{fi}}-\frac{\frac{\mathrm{\&delta;}}{k_s}\&CenterDot;h_2\&CenterDot;T_m+T_{\mathrm{wl}}}{1+\frac{\mathrm{\&delta;}}{k_s}\&CenterDot;h_2}}{\exp \left(\frac{L\&CenterDot;W\&CenterDot;h_2}{m\&CenterDot;c_p}\right)}$

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.

10. the heat transfer modeling method of irradiation space refrigerator as claimed in claim 9, is characterized in that, as follows:

The detailed process of described step 13 is as follows:

Can obtain biquadratic equation according to energy balance:

$\mathrm{\&epsiv;}\&CenterDot;\mathrm{\&sigma;}\&CenterDot;T_{\mathrm{wl}}^4+(h_1+\frac{h_2}{1+\frac{\mathrm{\&delta;}}{k_2}{\&CenterDot;h}_2})\&CenterDot;T_{\mathrm{wl}}=\mathrm{\&epsiv;}\&CenterDot;\mathrm{\&sigma;}\&CenterDot;{T_s}^4+h_1{\&CenterDot;T}_a+(h_2-\frac{\frac{\mathrm{\&delta;}}{k_s}\&CenterDot;{h_2}^2}{1+\frac{\mathrm{\&delta;}}{k_s}\&CenterDot;h_2})\&CenterDot;T_m$

Solve the outside wall surface temperature T that can obtain irradiation space refrigerator upper strata galvanized steel plain sheet _w1:

$T_{\mathrm{wl}}=\frac{-k+\sqrt{k^2-4l}}{2}$

In above formula:

$\begin{array}{c}k={[\frac{4r}{3}{\left(\frac{q^2+\sqrt{q^4-\frac{256}{27}{r}^3}}{2}\right)}^{-\frac{1}{3}}+{\left(\frac{q^2+\sqrt{q^4-\frac{256}{27}{r}^3}}{2}\right)}^{\frac{1}{3}}]}^{\frac{1}{2}},l=\frac{k^3-q}{2k},q=\frac{B}{A},r=-\frac{C}{A}\\ A=\mathrm{\&epsiv;}\&CenterDot;\mathrm{\&sigma;},B=h_1+\frac{h_2}{1+\frac{\mathrm{\&delta;}}{k_2}{\&CenterDot;h}_2},C=\mathrm{\&epsiv;}\&CenterDot;\mathrm{\&sigma;}\&CenterDot;{T_s}^4+h_1{\&CenterDot;T}_a+(h_2-\frac{\frac{\mathrm{\&delta;}}{k_s}\&CenterDot;{h_2}^2}{1+\frac{\mathrm{\&delta;}}{k_s}\&CenterDot;h_2})\&CenterDot;T_m.\end{array}$

Images