CN105135930A - Part for increasing convective heat transfer coefficient of condensate, refrigerating system and cooling and heating air conditioner - Google Patents
Part for increasing convective heat transfer coefficient of condensate, refrigerating system and cooling and heating air conditioner Download PDFInfo
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Abstract
The invention provides a part for increasing the convective heat transfer coefficient of condensate, a refrigerating system comprising the part and a cooling and heating air conditioner. The part is embedded into a tail end pipe of a condenser and comprises a main rod. A plurality of outer grooves are formed in the outer surface of the main rod. A plurality of channels for the condensate to flow are formed between the outer grooves of the main rod and the inner surface of the pipe. By means of the part, the new heat bridge channels are provided for heat delivering from the condensate in direct contact with the part to the inner surface of the pipe, the flowing sectional area of the condensate in an existing pipe is greatly reduced, the flowing speed of the condensate is greatly increased, and therefore the Reynolds number of the condensate on the inner side of the tail end pipe of the condenser and the convective heat transfer coefficient of the condensate to the inner wall of the pipe are greatly increased.
Description
Technical field
The present invention relates to design of heat exchanger technical field, particularly relate to a kind of component and refrigeration system, the air conditioner that improve condenser condenses liquid convection transfer rate.
Background technology
In industrial production, the condensate liquid condensed within the condenser usually to carry out further cooling namely carry out " excessively cold " operation after, just can carry out outer row." excessively cold " operation of condensate liquid is the important step in cooling medium production process.
And in the vapour compression refrigeration system (such as domestic air conditioner, dehumidifier and commercial use air conditioner) obtaining more extensive use, the difference of the degree of supercooling of condenser ends condensate liquid (refrigerating fluid) and the condensate temperature of condensation temperature and throttling arrangement entrance, has obvious impact to evaporator capacity; Improving the degree of supercooling of refrigerant system condenser end refrigerant liquid, is the important means improving refrigerating capacity and refrigeration efficiency ratio.
Now for R134a cold-producing medium, it is described:
In the cold-producing medium closed circuit circulatory system be made up of evaporimeter, compressor, condenser, throttling arrangement, cold-producing medium continuously repeats the heat absorption evaporation being flow to vapor phase stream by gas-liquid two-phase in evaporimeter, continuously repeats the exothermic condensation being flow to liquid phase stream by gas phase in condenser.But as can be seen from cold-producing medium pressure-enthalpy chart, the low pressure evaporation endothermic " enthalpy difference " of unit mass cold-producing medium, is greater than " enthalpy difference " of high pressure condensation heat release.
Check refrigerant R134a saturation property table, the heat of transformation under 10 DEG C, 60 DEG C saturation temperatures is respectively 190kJ/kg, 140kJ/kg, difference 50kJ/kg.Every kg refrigerant R134a is at 10 DEG C of evaporation endothermic amount 190kJ/kg, and than at 60 DEG C of condensation thermal discharge 140kJ/kg, have more 50kJ/kg, this has just broken the suction exothermic equilibrium of evaporator-condenser.
Rebuild the suction exothermic equilibrium of evaporator-condenser, in fact mainly realize lower than " excessively cold " of condensation temperature by R134a in condenser ends cooling heat release, and the inner sensible heat that the most liquid R134a of a small amount of liquid R134a absorption occurs again of the capillary (i.e. throttling arrangement) before entering evaporimeter " shifts to an earlier date " vaporization, realizes the suction exothermic equilibrium of evaporator-condenser.
Therefore, condensate liquid in raising condenser ends pipeline is to the convection transfer rate of condenser tube wall, improve " excessively cold " degree of condensate liquid, reduce the vaporization ratio of condensate liquid in throttling arrangement, thus improve the completeness and efficiency of the evaporation endothermic ability of condensate liquid in evaporimeter, become the important technology path of improving domestic air conditioner, dehumidifier and commercial use air conditioner refrigerating capacity and refrigeration efficiency ratio.
And in the condenser of air-conditioner, dehumidifier, after refrigerant gas is condensed into liquid, volume flow greatly reduces, flow velocity U greatly reduces, and causes the convective heat-transfer coefficient α of condenser ends condensate liquid and pipeline inner wall seriously on the low side; The convective heat-transfer coefficient α of condenser ends condensate liquid and pipeline inner wall is seriously on the low side, has a strong impact on again the cold effect of mistake of condensate liquid.
Summary of the invention
In order to solve the problem, the invention provides a kind of component improving condensate liquid convection transfer rate, described component is arranged in condenser ends pipeline, described component comprises a mobile jib, described mobile jib outer surface is provided with some water jackets, between described mobile jib water jacket and described pipeline inner surface, forms some passages circulated for condensate liquid.
Preferably, described component is screw rod, on the spiral outer surface being arranged on described mobile jib of described water jacket.
Preferably, described component is straight trough bar, and described water jacket is parallel to mobile jib and is axially disposed within described mobile jib outer surface.
Preferably, the cross section of the passage formed outside described component and between described pipeline inner surface is fan-shaped or trapezoidal or triangle.
Present invention also offers a kind of refrigeration system, comprise compressor, evaporimeter, throttling arrangement and condenser, described compressor, evaporimeter, throttling arrangement and condenser be linked in sequence formation one for cold-producing medium circulation circulation canal; Component as above is provided with in described condenser ends pipeline.
Preferably, corresponding outside described condenser ends pipeline fin and all the other fins of described outside condenser disconnect physically.
Present invention also offers a kind of air conditioner, comprise compressor, First Heat Exchanger, throttling arrangement and the second heat exchanger, described compressor, First Heat Exchanger, throttling arrangement and the second heat exchanger be linked in sequence formation one for cold-producing medium circulation circulation canal; Described compressor connects described First Heat Exchanger and the second heat exchanger by cross valve, and described First Heat Exchanger or the second heat exchanger are as condenser; Described First Heat Exchanger and the second heat exchanger are provided with component as above in the end pipeline of described throttling arrangement side.
Preferably, described First Heat Exchanger and the second heat exchanger fin that correspondence is arranged outside the end pipeline of described throttling arrangement side and all the other fins of outside disconnect physically.
The present invention, owing to adopting above technical scheme, makes it compared with prior art, has following advantage and good effect:
The present invention is a kind of to improve the component of condenser condenses liquid convection transfer rate and comprises refrigeration system, the air conditioner of this component, by being implanted into a component at condenser ends pipeline; This component and pipeline inner surface closely cooperate, and form several between this component and pipeline inner surface for condensate liquid circulation passage; This component is both for provide new heat bridge passage with the condensate liquid that this component directly contacts to pipeline inner surface transfer heat, drastically reduce the area again the actual internal area of the condensate liquid in existing condenser ends pipeline, significantly improve the flow velocity of condensate liquid, thus increase substantially the Reynolds number of condensate liquid inside condenser ends pipeline and condensate liquid to the convective heat-transfer coefficient of pipeline inner wall;
Fin corresponding outside condenser ends pipeline and all the other fins of the outside condenser fin of front end pipeline (in the middle part of the condenser) also cut off, to realize disconnecting physically by the present invention; To cut off the heat bridge contact between fin, namely the heat cutting off condenser middle front part high-temperature area pipeline by fin to the condenser ends pipeline inner condensat liquid transmission being in low-temperature space, to prevent from having a negative impact to " deeply undercooling " of condenser ends pipeline condensate liquid.
Accompanying drawing explanation
By reference to the accompanying drawings, by detailed description hereafter, above-mentioned and other feature and advantage of the present invention more clearly can be understood, wherein:
Fig. 1 is the schematic diagram that the kind of refrigeration cycle of cold deficiency crossed by condenser ends condensate liquid;
Fig. 2 is the schematic diagram of the screw rod embedded in condenser ends pipeline of the present invention and pipeline;
Fig. 3 is the sectional view of the screw rod embedded in condenser ends pipeline of the present invention and pipeline;
Fig. 4 is condenser side plate and elbow annexation schematic diagram in embodiment two;
Fig. 5 is condenser pipe sectional view in embodiment two;
Fig. 6 is the schematic diagram of the kind of refrigeration cycle in embodiment two after condenser ends cold-producing medium deeply undercooling;
Fig. 7 is the principle schematic of dehumidifier in prior art;
Fig. 8 is the principle schematic of dehumidifier in embodiment two;
Fig. 9 is the principle schematic of air conditioner in embodiment three.
Detailed description of the invention
See the accompanying drawing that the embodiment of the present invention is shown, hereafter in more detail the present invention will be described.But the present invention can realize in many different forms, and should not be construed as by the restriction in the embodiment of this proposition.On the contrary, it is abundant and complete open in order to reach for proposing these embodiments, and makes those skilled in the art understand scope of the present invention completely.In these accompanying drawings, for clarity sake, may be exaggerated size and the relative size in layer and region.
For R134a cold-producing medium, in refrigerant-cycle systems, rebuild the suction exothermic equilibrium of evaporator-condenser, in fact mainly realize lower than " excessively cold " of condensation temperature by R134a in condenser ends cooling heat release, and the inner sensible heat that the most liquid R134a of a small amount of liquid R134a absorption occurs again of the capillary (i.e. throttling arrangement) before entering evaporimeter " shifts to an earlier date " vaporization, realizes.
Concrete, as shown in Figure 1, the condensate liquid of condenser ends, after entering throttling arrangement, after its pressure is reduced to the intersection point of throttle line and the saturated liquidus of cold-producing medium, have a small amount of liquid refrigerant to vaporize in throttling arrangement successively, and major part does not have the condensate liquid of vaporizing to provide required heat of vaporization by the vaporization that the sensible heat of cooling releasing oneself is small part liquid refrigerant; Arrived the outlet of throttling arrangement, usually have the refrigerating fluid of about 20% to vaporize, " mass dryness fraction " of cold-producing medium reaches 0.2, forms the biphase gas and liquid flow that 20% gas and 80% liquid mix, enters evaporimeter., condenser ends condensate liquid " excessively cold " high at condensing pressure operates not enough, the refrigerating fluid up to 30% is even had to vaporize in throttling arrangement, " mass dryness fraction " that just flowed out throttle device refrigeration agent just reaches 0.3, the liquid refrigerant ratio entering evaporimeter is caused to only have 70%, liquid refrigerant supply is not enough, causes evaporator capacity to decline.
So, improve " excessively cold " degree of condenser ends condensate liquid, just reduce the vaporization ratio of condensate liquid in throttling arrangement, thus improve the completeness and efficiency of the evaporation endothermic ability of condensate liquid in evaporimeter.
At condenser ends, from in pipeline to pipeline, condensate liquid heat release " excessively cold ", at hot-fluid in pipeline " condensate liquid → pipeline inner surface ", " pipeline inner surface → pipeline outer surface ", " pipeline outer surface → fin → air " syllogic heat trnasfer in, " condensate liquid → pipeline inner surface " has not had the phase transformation of refrigerant gas condensation to occur, and the entire thermal resistance of syllogic heat trnasfer mainly concentrates on " pipeline inner condensat liquid → pipeline inner surface " this one-phase.
By the computing formula 1/K=1/ α of overall heat-transfer coefficient K
1+ b/ λ+1/ α
2known, а
1, b/ λ, а
2in relative smaller, have larger impact to overall heat-transfer coefficient K on the contrary.At the а of condenser ends " pipeline inner condensat liquid → pipeline inner surface " this one-phase
1less, become the key point improving condenser ends overall heat-transfer coefficient K.
In the syllogic heat trnasfer of hot-fluid " condensate liquid → pipeline inner surface ", " pipeline inner surface → pipeline outer surface ", " pipeline outer surface → fin → air " in pipeline of above-mentioned condenser ends, the main cause that in pipeline, the thermal resistance of " condensate liquid → pipeline inner surface " is larger is: the flow velocity of condensate liquid is on the low side.Because the density of condensate liquid is about 10 times of refrigerant gas density under uniform pressure in condenser, the flow velocity of the condenser ends condensate liquid of all single tube series connection only has about 1/10 of condenser inlet refrigerant gas flow velocity.
And, the flow velocity of cold-producing medium, for reynolds number Re and the convective heat-transfer coefficient α of cold-producing medium, important; At the condenser pipe end of general domestic air conditioner and dehumidifier, the Reynolds number of condensate liquid: Re=d*u* ρ/μ, Re is about 20000, (in formula, warp in d---pipeline, u---refrigerant flow rates, ρ---refrigerant density, μ---cold-producing medium viscosity).
Can to be derived convective heat-transfer coefficient by the accurate number of Nu Saierte again: Nu=α * d/ λ=0.023Re
0.8* Pr
n;
(in formula, α--convective heat-transfer coefficient, λ--cold-producing medium thermal conductivity factor, Re--Reynolds number, Pr--Prandtl number; Index n, heat release gets 0.3, and heat absorption gets 0.4); Convective heat-transfer coefficient α=the A*u of condenser ends condensate liquid and pipeline inner wall can be obtained
0.8/ d
0.2; (in formula, A is constant, u---refrigerant flow rates, d--tubing internal diameter);
Take cold-producing medium as the refrigerating capacity 3200W air-conditioner of R134a be example, when condenser ends R134a cold-producing medium cross be as cold as 30 DEG C, evaporating temperature 10 DEG C time, evaporation enthalpy difference is 400-240=160kJ/kg=160J/g; Evaporimeter 3200W heat absorption capacity is equivalent to the refrigerant flow of 20g/s (about 72kg/h); When 16.8bar (60 DEG C), the density of R134a saturated vapor is that the R134a refrigerant mass fluxes of 0.01144m3/kg, 72kg/h equals high temperature refrigerant gas in condenser and releases the 0.82m that sensible heat really enters " condensation " section porch
3the volume flow of/h, for diameter 7mm pipeline, flow velocity is about 4.6m/s; In condenser inlet, refrigerant gas is overheated, and speed is slightly larger, and flow velocity is at about 5m/s; And at condenser ends, the density 1052.9kg/m of condensate liquid
3, refrigerant flow rates is reduced to 0.38m/s, and this is very low flow velocity, and the convection transfer rate of the condensate liquid inside condenser ends pipeline and pipeline tube wall is very low, according to α=A*u
0.8/ d
0.2, α value is 10
2level, greatly about 600W/ (㎡ * DEG C) left and right, only has the 1/5----1/10 of evaporation, condensation phase-change heat transfer coefficient.
From the above, by improving the most effective way that the flow velocity U of condensate liquid is the convective heat-transfer coefficient α improving condenser ends condensate liquid and pipeline inner wall.
Embodiment one
The invention provides a kind of component improving condenser condenses liquid convection transfer rate, by being implanted into a component at condenser ends pipeline (such as copper pipe), be conceived to improve in condenser after refrigerant gas " condensation phase transformation exothermic process ", namely enter the condensate flow-rate that namely condensate liquid " excessively cold stage " also enters condenser " end ", improve the Reynolds number of condensate flow, reduce the thickness in boundary layer, thus this governs the thermal resistance (three-zone heat-transfer of condenser end of the condensate liquid convective heat-transfer coefficient of whole syllogic overall heat-transfer coefficient critical stage on the low side to reduce the first paragraph of condenser ends in the syllogic heat trnasfer of hot-fluid from-inner-to-outer i.e. " pipeline inner condensat liquid → pipeline inner surface ", namely from the cross section perpendicular to condenser ends refrigerant line, from " pipeline inner condensat liquid → pipeline inner surface ", " pipeline inner surface → pipeline outer surface ", the laddering heat transfer of " pipeline outer surface → fin → air ").
Concrete, with reference to Fig. 2-3, component 2 includes a mobile jib 21, outside mobile jib 21, face one is provided with some water jackets 22 on enclosing, component 2 is implanted in condenser ends pipeline 1, this component 2 fits tightly with the inner surface of condenser ends pipeline 1, and makes to form some passages 3 circulated for cold-producing medium between some water jackets 22 and the inner surface of condenser ends pipeline 1.
Wherein, component 2 can be screw rod, on the spiral outer surface being arranged on mobile jib 21 of water jacket 22; Component 2 also can be straight trough bar, and water jacket 22 is parallel to mobile jib 21 and is axially disposed within mobile jib 21 outer surface; The present invention for water jacket 22 structure, on mobile jib 21, arrangement form is not all restricted, can design as the case may be.
The cross section of the passage 3 formed outside component 2 and between condenser ends pipeline 1 inner surface can in small fan-shaped or small trapezoidal or small triangle etc., and the concrete section form of passage 3, by the structures shape of water jacket 22, is not restricted herein.
Component 2 can be metallic rod, such as aluminium alloy rod; Component 2 also can be non-metallic rod, such as plastic bar, the such as vapour compression refrigeration system such as air-conditioner and dehumidifier, its condensation temperature is generally at about 60 DEG C, the present invention adopts plastic bar, and near 60 DEG C, the intensity of plastic bar and life-span can meet the demands; Which kind of material component 2 specifically adopts, and is not restricted herein.
Component 2 provided by the invention, both for provide new heat bridge passage with the condensate liquid that this component 2 directly contacts to condenser ends pipeline 1 inner surface transfer heat, drastically reduce the area again the actual internal area of the condensate liquid in original condenser ends pipeline 1, significantly improve the flow velocity of condensate liquid, thus increase substantially the Reynolds number of condensate liquid inside condenser ends pipeline 1 and condensate liquid to the convective heat-transfer coefficient of pipeline inner wall.In addition, the present invention, by implanting in condenser ends pipeline 1 by special component 2, also significantly decreases the refrigerant charge of refrigerating plant.
In addition, special component is implanted in condenser ends pipeline, while the flow velocity significantly improving condensate liquid and convection transfer rate, too increases the on-way resistance that condenser ends condensate liquid flows in pipeline; But this part on-way resistance increased, do not need the power consumption additionally increasing refrigeration compressor, but can by reducing the length of the throttling degree of depth such as capillary of throttling arrangement, redistribute the pressure drop between condenser and evaporimeter, condenser ends is transferred in a part of pressure drop by original throttling arrangement, to overcome the on-way resistance increased in this part condenser ends pipeline.In vapor compression refrigeration device, the pressure reduction provided by compressor is exactly the difference of condensing pressure and evaporating pressure, and the pressure reduction of also i.e. throttling arrangement import and export, up to 1 ~ 3Mpa; In this pressure reduction up to 1 ~ 3Mpa, even go out sub-fraction for overcoming the on-way resistance increased in condenser ends pipeline, be truly feasible, therefore do not need the power consumption additionally increasing refrigeration compressor completely.
Embodiment two
The invention provides a kind of refrigeration system, comprise compressor, evaporimeter, throttling arrangement and condenser, compressor, evaporimeter, throttling arrangement and condenser be linked in sequence formation one for cold-producing medium circulation circulation canal; The component as described in embodiment one is provided with in condenser ends pipeline.
Again because the flow process along condenser pipe is seen, condenser will be born " the heat release cooling of the sensible heat part of hyperthermia and superheating " of the high-temperature high-pressure refrigerant gas that compressor transports, the heat release task in " saturated refrigerant gas condensation heat release liquefaction " and " condensate liquid was lowered the temperature cold further " such 3 stages (with front addressed " from the cross section perpendicular to condenser ends refrigerant line, from pipeline inner condensat liquid → pipeline inner surface, pipeline inner surface → pipeline outer surface, three progress step by step formula heat transfers of pipeline outer surface → fin → air " be two diverse concepts), and the fin of Fin-tube Condenser and the material selected by pipeline are all copper, the good conductor of the heat such as aluminium, if simultaneously through bearing above-mentioned " cooling of refrigerant release gas sensible heat " on same group of fin, " condensation of gas heat release liquefaction ", the pipeline of " liquid was lowered the temperature cold further " 3 tasks, then also exist between the condenser region of obvious temperature fall at these 3, " heat bridge " is formed along fin direction, both caused heat from the first paragraph " seen " along the flow process of condenser pipe " the heat release cooling of hyperthermia and superheating refrigerant gas sensible heat part " stage (general air-conditioner out of doors under temperature 35 DEG C of conditions this stage refrigerant gas temperature drop to about 60 DEG C from about 90 DEG C), transmit along fin to second segment " refrigerant gas condensation heat release liquefaction " stage (this stage refrigerant gas condensation temperature is at about 60 DEG C), also cause heat to transmit along fin to the 3rd period of " condensate liquid the was lowered the temperature cold " stage (this phase condensation liquid temp drops to about 40 DEG C from about 60 DEG C) from second segment " the refrigerant gas condensation heat release liquefaction " stage (condensation temperature is at about 60 DEG C) simultaneously, and due to second segment be " condensation segment " pipeline inside refrigerant gas condensation heat release heat transfer coefficient very high, reach 10
3level (usually at 5000W/ (㎡ * DEG C) left and right), cause the temperature higher (about 55 DEG C) of the second segment i.e. pipeline of " condensation segment " and the outer fin of pipeline, by fin heat bridge to the 3rd section namely " condensate liquid cooling super cooled sect " form larger heat transfer temperature difference and heat power, reduce condenser ends namely along the degree of " heat release is excessively cold " of the phase III condensate liquid that the flow process of condenser pipe is seen, thus reduce the efficiency of condenser and the refrigerating capacity of evaporimeter.
Therefore, in the present embodiment, fin corresponding outside condenser ends pipeline, disconnect physically with all the other fins of the outside condenser fin of front end pipeline (in the middle part of the condenser), as shown in Figure 4, Figure 5, to cut off the heat bridge contact between fin, the heat namely cutting off condenser middle front part high-temperature area pipeline by fin to the condenser ends pipeline inner condensat liquid transmission being in low-temperature space, to prevent from having a negative impact to " deeply undercooling " of condenser ends pipeline condensate liquid.
After the present invention cuts off the fin on condenser, tool is significantly improved the effect of refrigeration system Energy Efficiency Ratio, below to adopt the evaporating pressure 4.1 kilograms of R134a cold-producing medium, the kind of refrigeration cycle of condensing pressure 16.8 kilograms illustrates:
With reference to Fig. 6, in evaporimeter under 4.1 kilograms of evaporating pressures, saturation temperature 10 DEG C of conditions, the R134a liquid refrigerant evaporation endothermic amount of every kg is 190.74kJ; And the specific heat capacity of this condensate liquid within the condenser under 16.8 kilograms of pressure, saturation temperature 60 DEG C of conditions is 1.66kJ/kg, if increase the cooling (namely increase by 10 DEG C is excessively cold) of 10 DEG C at the condensate liquid of condenser ends, just add the thermal discharge of 16.6kJ/kg within the condenser, this is also just equivalent to the caloric receptivity adding 16.6kJ/kg in evaporimeter, and this caloric receptivity is 8.7% of the evaporation endothermic amount 190.74kJ/kg of this cold-producing medium in evaporimeter; If increase by 20 DEG C excessively cold at the condensate liquid of condenser ends, just add the thermal discharge of 33.2kJ/kg within the condenser, this is also just equivalent to the caloric receptivity adding 33.2kJ/kg in evaporimeter, this caloric receptivity be this cold-producing medium in evaporimeter evaporation endothermic amount 190.74kJ/kg 17.4%.
Result of calculation shows, the degree of supercooling of condensate liquid in condenser ends pipeline often increases by 1 DEG C, and the average increment rate of caused refrigerating capacity is about 1%.If original air-conditioner condenser end condensate liquid is crossed " 5 " point be as cold as in Fig. 6 and is entered throttling arrangement (capillary), the mass dryness fraction exporting " 6 " at throttling arrangement is 0.3, adopt that the present invention is a kind of improves the component of condenser condenses liquid convection transfer rate and comprise the refrigerating plant of this component, the condensate temperature of condensator outlet reduces about 20 DEG C again, the cold-producing medium mass dryness fraction of throttling arrangement outlet is reduced to 0.1 and is namely reduced to " 6 " point, and evaporator capacity increases (0.3-0.1)/0.7*100% ≈ 30%.
With regard to using the dehumidifier of inventive refrigeration system to be example, be further described, specific as follows:
As shown in Figure 7, be the principle schematic of existing dehumidifier, 4 be compressor, 5 be wherein evaporimeter, for throttling arrangement, 7 be condenser, 8 be water tank, 9 for screen pack.Connect with the air channel of condenser 7 in the air channel of the evaporimeter 5 of existing dehumidifier.Under the promotion of blower fan, humid air first filters through screen pack 9, Cryogenic air again after evaporator 5 cool-down dehumidification, look over from the pipeline flow process of condenser 7, Cryogenic air flows through " condensate liquid was lowered the temperature cold ", " saturated refrigerant gas condensation heat release liquefaction ", " sensible heat is released in the cooling of high-temperature high-pressure refrigerant gas " three phases in condenser 7 in turn, becomes dry air and discharge dehumidifier after reheating.
Under the standard of 26.7 DEG C of RH60% removes wet cooling condition, evaporimeter 5 li of refrigerant evaporating temperature of existing dehumidifier are at about 7 DEG C, and evaporimeter leaving air temp is at about 14 DEG C; The low temperature air-out of about 14 DEG C of evaporimeter, reverse " condensate liquid was lowered the temperature cold " flow through in condenser, " saturated refrigerant gas condensation heat release liquefaction ", " sensible heat is released in the cooling of high-temperature high-pressure refrigerant gas " three phases, the dry air becoming about 40 DEG C after reheating discharges dehumidifier.But, even if there is the low temperature of about 14 of evaporimeter DEG C the wind comes from, because the convection transfer rate of condenser ends condensate liquid and pipeline inner wall is on the low side, add that in the middle part of condenser, " saturated refrigerant gas condensation heat release liquefaction stages " is by the heat effect of fin heat bridge to condenser ends " condensate liquid cooling super cooled sect ", the temperature being about to the condensate liquid entering throttling arrangement of condenser ends, still up to about 40 DEG C, the heat transfer temperature difference of the wind comes from evaporimeter low temperature is more than 25 DEG C.
As shown in Figure 8, for dehumidifier provided by the invention, the present invention implants screw rod in condenser 7 end pipeline, several are formed for condensate liquid circulation passage between this bar and pipeline inner surface, this component both provided new heat bridge passage for condensate liquid to pipeline inner surface transfer heat, drastically reduce the area again the actual internal area of the condensate liquid in original pipeline, significantly improve the flow velocity of condensate liquid, thus increase substantially the Reynolds number of condensate liquid inside condenser ends pipeline and condensate liquid to the convective heat-transfer coefficient of pipeline inner wall; The present invention has also cut off " saturated refrigerant gas condensation heat release liquefaction stages " in the middle part of condenser 7 and has contacted with the fin heat bridge of condenser 7 end " condensate liquid cooling super cooled sect ", has also namely blocked " saturated refrigerant gas condensation heat release liquefaction stages " heat effect to condenser ends " condensate liquid cooling super cooled sect " in the middle part of condenser; Under the cooling that the low temperature of about 14 DEG C of evaporimeter be the wind comes from, the temperature being about to the condensate liquid entering throttling arrangement of condenser ends, is reduced to about 20 DEG C, and the cold-producing medium mass dryness fraction of throttling arrangement outlet is reduced to less than 0.1, compared with conventional dehumidification machine, the refrigerating capacity of evaporimeter improves nearly 30%.
Embodiment three
With reference to Fig. 9, the invention provides a kind of air conditioner, air conditioner comprises compression 4, First Heat Exchanger 11, throttling arrangement 6 and the second heat exchanger 12, compressor 4, First Heat Exchanger 11, throttling arrangement 6 and the second heat exchanger 12 be linked in sequence formation one for cold-producing medium circulation circulation; Compressor 4 connects First Heat Exchanger 11 and the second heat exchanger 12 by cross valve 10, wherein First Heat Exchanger 11 is indoor set, second heat exchanger 12 is off-premises station, and the present invention, by regulating cross valve 10, makes First Heat Exchanger 11 be used as condenser as condenser or the second heat exchanger 12.During cooling in summer, off-premises station second heat exchanger 12 uses as condenser, and indoor set First Heat Exchanger 11 uses as evaporimeter device; " excessively cold " is implemented to condenser ends, the sensible heat of the condensate liquid in condenser ends pipeline is emitted on open air as much as possible, just can expands the refrigerating capacity of indoor evaporator further, improve the refrigeration efficiency ratio of air-conditioner; During winter heating, indoor set First Heat Exchanger 11 uses as condenser, and off-premises station second heat exchanger 12 uses as evaporimeter; " excessively cold " is implemented to condenser ends, the sensible heat of the condensate liquid in indoor condenser ends pipeline is emitted on indoor as much as possible, just can expand the caloric receptivity of outdoor evaporator (summer is condenser) out of doors in air further, improve the heating energy efficiency ratio of air-conditioner.
In the present embodiment, First Heat Exchanger 11 and the second heat exchanger 12 are provided with the component as described in embodiment one in the end pipeline of throttling arrangement side, and fin and all the other fins of outside of the corresponding setting outside the end pipeline of throttling arrangement side of First Heat Exchanger 11 and the second heat exchanger 12 disconnect physically.
First with cooling in summer mode declaration pattern specification it:
The present invention implants the component as described in embodiment one in outdoor condenser (i.e. the second heat exchanger 12) end pipeline, several are formed for condensate liquid circulation passage between component and pipeline inner surface, this component both provided new heat bridge passage for condensate liquid to pipeline inner surface transfer heat, drastically reduce the area again the actual internal area of the condensate liquid in original pipeline, significantly improve the flow velocity of condensate liquid, thus increase substantially the Reynolds number of condensate liquid inside condenser ends pipeline and condensate liquid to the convective heat-transfer coefficient of pipeline inner wall.In addition, fin and all the other fins of outside of corresponding setting outside condenser ends pipeline in the present embodiment disconnect physically, namely cut off " saturated refrigerant gas condensation heat release liquefaction stages " in the middle part of condenser to contact with the fin heat bridge of condenser ends " condensate liquid cooling super cooled sect ", also namely blocked " saturated refrigerant gas condensation heat release liquefaction stages " heat effect to condenser ends " condensate liquid cooling super cooled sect " in the middle part of condenser; Under the cooling of air out of doors, the temperature being about to the condensate liquid entering throttling arrangement of condenser ends, is reduced to and the open-air temperature difference about 5 DEG C, and compared with conventional air conditioner, the refrigerating capacity of indoor evaporator improves more than 10%;
In addition, also implantable component in the pipeline of First Heat Exchanger 11 entrance used as evaporimeter, and fin corresponding to First Heat Exchanger 11 entrance pipe also physically can disconnect with all the other fins; Evaporator refrigerant porch be implanted with evaporating pressure in the pipeline of component and evaporating temperature there will be small size rising, with the trend that the heat transfer temperature difference of evaporimeter outer air reduces, heat absorption capacity also has reduction; But the reduction trend of this heat absorption capacity, by this section of pipeline because screw rod implants the refrigerant flow rates that brings accelerate, overall heat-transfer coefficient improve write off.
Again with winter heating's mode declaration pattern specification it:
The present invention implants the component as described in embodiment one in indoor condenser (i.e. First Heat Exchanger 11) end pipeline, several are formed for condensate liquid circulation passage between this component and pipeline inner surface, this component both provided new heat bridge passage for condensate liquid to pipeline inner surface transfer heat, drastically reduce the area again the actual internal area of the condensate liquid in original pipeline, significantly improve the flow velocity of condensate liquid, thus increase substantially the Reynolds number of condensate liquid inside condenser ends pipeline and condensate liquid to the convective heat-transfer coefficient of pipeline inner wall.In addition, fin and all the other fins of outside of corresponding setting outside condenser ends pipeline in the present embodiment disconnect physically, namely cut off " saturated refrigerant gas condensation heat release liquefaction stages " in the middle part of condenser to contact with the fin heat bridge of condenser ends " condensate liquid cooling super cooled sect ", also namely blocked " saturated refrigerant gas condensation heat release liquefaction stages " heat effect to condenser ends " condensate liquid cooling super cooled sect " in the middle part of condenser; Under the cooling of air out of doors, the temperature being about to the condensate liquid entering throttling arrangement of condenser ends, is reduced to and the open-air temperature difference about 5 DEG C, and compared with conventional air conditioner, the refrigerating capacity of indoor evaporator improves more than 10%.
In addition, also implantable component in the pipeline of the second heat exchanger 12 entrance used as evaporimeter, and fin corresponding to the second heat exchanger 12 entrance pipe also physically can disconnect with all the other fins; Evaporator refrigerant porch be implanted with evaporating pressure in the pipeline of component and evaporating temperature there will be small size rising, with the trend that the heat transfer temperature difference of evaporimeter outer air reduces, heat absorption capacity also has reduction; But the reduction trend of this heat absorption capacity, by this section of pipeline because screw rod implants the refrigerant flow rates that brings accelerate, overall heat-transfer coefficient improve write off.
Those skilled in the art should be understood that the present invention can realize with other concrete forms many and not depart from the spirit or scope of the present invention.Although describe embodiments of the invention, the present invention should be understood and should not be restricted to these embodiments, within the spirit and scope of the invention that those skilled in the art can define as appended claims, make change and amendment.
Claims (8)
1. one kind is improved the component of condensate liquid convection transfer rate, it is characterized in that, described component is arranged in condenser ends pipeline, described component comprises a mobile jib, described mobile jib outer surface is provided with some water jackets, between the water jacket of described mobile jib and described pipeline inner surface, forms some passages circulated for condensate liquid.
2. the component of raising condensate liquid convection transfer rate according to claim 1, is characterized in that, described component is screw rod, on the spiral outer surface being arranged on described mobile jib of described water jacket.
3. the component of raising condensate liquid convection transfer rate according to claim 1, is characterized in that, described component is straight trough bar, and described water jacket is parallel to mobile jib and is axially disposed within described mobile jib outer surface.
4. the component of raising condensate liquid convection transfer rate according to claim 1, is characterized in that, the cross section of the passage formed outside described component and between described pipeline inner surface is fan-shaped or trapezoidal or triangle.
5. a refrigeration system, is characterized in that, described refrigeration system comprises compressor, evaporimeter, throttling arrangement and condenser, described compressor, evaporimeter, throttling arrangement and condenser be linked in sequence formation one for cold-producing medium circulation circulation canal; Be provided with as the component in claim 1-4 as described in any one in described condenser ends pipeline.
6. refrigeration system according to claim 5, is characterized in that, fin corresponding outside described condenser ends pipeline and all the other fins of described outside condenser disconnect physically.
7. an air conditioner, it is characterized in that, described air conditioner comprises compressor, First Heat Exchanger, throttling arrangement and the second heat exchanger, described compressor, First Heat Exchanger, throttling arrangement and the second heat exchanger be linked in sequence formation one for cold-producing medium circulation circulation canal; Described compressor connects described First Heat Exchanger and the second heat exchanger by cross valve, and described First Heat Exchanger or the second heat exchanger are as condenser; Described First Heat Exchanger and the second heat exchanger are provided with as the component in claim 1-4 as described in any one in the end pipeline of described throttling arrangement side.
8. air conditioner according to claim 7, is characterized in that, fin and all the other fins of outside of the corresponding setting outside the end pipeline of described throttling arrangement side of described First Heat Exchanger and the second heat exchanger disconnect physically.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510566681.2A CN105135930A (en) | 2015-09-08 | 2015-09-08 | Part for increasing convective heat transfer coefficient of condensate, refrigerating system and cooling and heating air conditioner |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510566681.2A CN105135930A (en) | 2015-09-08 | 2015-09-08 | Part for increasing convective heat transfer coefficient of condensate, refrigerating system and cooling and heating air conditioner |
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| CN105135930A true CN105135930A (en) | 2015-12-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510566681.2A Pending CN105135930A (en) | 2015-09-08 | 2015-09-08 | Part for increasing convective heat transfer coefficient of condensate, refrigerating system and cooling and heating air conditioner |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110779196A (en) * | 2019-11-14 | 2020-02-11 | 珠海格力电器股份有限公司 | Heat exchange tube and heat exchanger |
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Application publication date: 20151209 |