CN101368777A - Liquid coolant defrosting and refrigeration system - Google Patents
Liquid coolant defrosting and refrigeration system Download PDFInfo
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- CN101368777A CN101368777A CNA200810152328XA CN200810152328A CN101368777A CN 101368777 A CN101368777 A CN 101368777A CN A200810152328X A CNA200810152328X A CN A200810152328XA CN 200810152328 A CN200810152328 A CN 200810152328A CN 101368777 A CN101368777 A CN 101368777A
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- electromagnetic valve
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Abstract
The invention discloses a liquid refrigerant defrost refrigeration system, aiming to provide a refrigeration system which can improve the defrost efficiency, reduce the defrost impact on the room temperature control and increase the high-temperature liquid undercooling degree so as to enhance the performance and efficiency of the overall refrigeration device. A compressor is connected with a condenser, a high-pressure liquid reservoir and a dryer in sequence; the dryer is connected with a first electromagnetic valve and a fourth electromagnetic valve respectively; the first electromagnetic valve is connected with a second thermal expansion valve and a second evaporator respectively; the second evaporator is connected with a second electromagnetic valve and a sixth electromagnetic valve respectively; the second electromagnetic valve is connected with a first thermal expansion valve through a first one-way valve; the first thermal expansion valve is connected with a first evaporator and the fourth electromagnetic valve respectively; the first evaporator is connected with a third electromagnetic valve and a fifth electromagnetic valve respectively; the third electromagnetic valve is connected with the compressor and the sixth electromagnetic valve respectively; and the fifth electromagnetic valve is connected with the inlet of the second thermal expansion valve through a second one-way valve. The system ensures continuous cooling and dehumidification.
Description
Technical field
The present invention relates to a kind of refrigeration system, in particular, relate to a kind of liquid coolant defrosting and refrigeration system.
Background technology
In the refrigeration system running, in the easy frosting of evaporator surface, the existence of frost layer makes heat transfer deterioration, and refrigerating efficiency reduces.Therefore, defrosting just seems especially important timely.All there are some drawbacks in present Defrost mode, and common refrigeration system evaporator adopts electric heating and hot gas defrosting.Though adopt electric defrosting also can obtain good defrosting effect, owing to be to heat defrosting outside cooling tube, efficient is low, energy consumption is big.Hot gas defrosting then needs to control defrosting speed and returns refrigeration compressor to prevent a large amount of refrigerant liquids, can make system complex if the defrosting drainage system is set, and increases operation easier.In addition from controlling the angle of freezer or indoor air temperature in air conditioned building, adopt above-mentioned two kinds of Defrost modes bigger to temperature effect in the control room, temperature fluctuation is violent, especially for constant temperature and humidity system, because defrosting and refrigeration hocket, cooling and dehumidification process do not have continuity, make that the interior temperature fluctuation of refrigeration space is bigger.
Summary of the invention
The present invention is in order to overcome weak point of the prior art, provide a kind of and can improve defrosting efficiency, reduce to defrost to controlling the influence of room temperature, increase the high-temp liquid degree of supercooling, thereby improve the liquid coolant defrosting and refrigeration system of whole refrigerating plant performance and efficient.
The present invention is achieved through the following technical solutions:
A kind of liquid coolant defrosting and refrigeration system, it is characterized in that, the outlet of compressor and condenser, the high pressure reservoir, drier connects successively, the outlet of described drier is connected with the 4th electromagnetic valve entrance with first electromagnetic valve entrance respectively, described first electromagnetic valve outlet is connected with the outlet of second heating power expansion valve and the refrigerant inlet of second evaporimeter respectively by threeway, the refrigerant outlet of described second evaporimeter is connected with the 6th electromagnetic valve entrance with second electromagnetic valve entrance respectively by threeway, described second electromagnetic valve outlet is connected with the first thermal expansion valve inlet by first check valve, the described first thermal expansion valve outlet port is connected with the 4th electromagnetic valve outlet with the refrigerant inlet of first evaporimeter respectively by threeway, the refrigerant outlet of described first evaporimeter is connected with the 5th electromagnetic valve entrance with the 3rd electromagnetic valve entrance respectively by threeway, described the 3rd electromagnetic valve outlet is connected with the 6th electromagnetic valve outlet with the suction port of compressor respectively by threeway, and described the 5th electromagnetic valve outlet is connected with the second thermal expansion valve inlet by second check valve.The temperature-sensitive bag of first heating power expansion valve is installed in the refrigerant outlet pipeline of first evaporimeter, and the temperature-sensitive bag of second heating power expansion valve is installed in the refrigerant outlet pipeline of second evaporimeter.
Wherein, described first evaporimeter and second evaporimeter are respectively finned-tube evaporator.
Liquid coolant defrosting and refrigeration system operation principle of the present invention is simply as follows: the high temperature and high pressure gas that compressor is discharged at first enters condenser, and the highly pressurised liquid that comes out from condenser enters the evaporimeter of frosting behind high pressure reservoir, device for drying and filtering.Because the hydrothermal solution temperature far above 0 ℃, makes the evaporator surface temperature raise, surface frost layer is heated by tube wall and melts rapidly.Entered in the refrigerating evaporator after choke valve throttling step-down by the liquid refrigerant of being discharged by the defrosting evaporimeter, final saturation gas is sucked by compressor.When refrigerating evaporator frosting thickness reached a certain limit, the magnetic valve commutation made the transposing of defrosting evaporimeter and refrigerating evaporator, repeats with cocycle.Just, second evaporimeter is in the hot liquid defrosting state when first evaporimeter freezes, and first evaporimeter is in the hot liquid defrosting state when second evaporimeter freezes.When an evaporator defrost, another evaporimeter continues to keep refrigerating operaton, thereby has reduced defrosting to the influence of fluctuations with cold cell temperature caused.
The present invention has following technique effect:
1. the keying by the control magnetic valve in the refrigeration system of the present invention realizes the refrigeration of two groups of evaporimeters and the alternation of defrosting, thereby cooling and dehumidification process are kept continuously, and temperature, the humidity of guaranteeing to control room environment are constant.
2. refrigeration system of the present invention adopts the hot liquid defrosting mode, and defrosting thoroughly, safely, does not reliably consume external energy, and the used refrigerant liquid temperature that defrosts is moderate, can avoid the influence to performance of evaporator.
3. refrigeration system of the present invention heating in the evaporimeter has cleaning action to tube wall, particularly can wash away wherein long-pending lubricating oil, the impurity that has, and purifies pipeline, improves heat-transfer effect.
4. refrigeration system defrost process of the present invention and process of refrigerastion carry out simultaneously, and the frost layer of evaporator surface is used to cool off the saturated liquid of being discharged by condenser, makes highly pressurised liquid cold excessively, can improve the coefficient of performance of whole device, and energy-saving effect is remarkable.
5. the utilization of refrigeration system of the present invention frost cold in high-pressure system also can reduce condensation temperature, can make air-cooled device than more stable performance and higher Energy Efficiency Ratio are arranged under the rugged environment.
6. liquid coolant defrosting and refrigeration system of the present invention has overcome that electric defrosting consumes additional source of energy and hot gas defrosting speed is slow, system complex and shortcoming that the two is bigger to temperature effect in the control room.Utilize the high pressure-temperature liquid refrigerants to defrost, on the basis that reaches the defrosting purpose, kept the continuity of system, reduced defrosting, increased the degree of supercooling of liquid coolant simultaneously, improved the efficient of refrigeration system the control room Temperature Influence.
Description of drawings
Fig. 1 is a liquid coolant defrosting and refrigeration system schematic diagram of the present invention;
Fig. 2 is the tephigram of liquid coolant defrosting and refrigeration system of the present invention;
Fig. 3 is the pressure-enthalpy chart of liquid coolant defrosting and refrigeration system of the present invention.
The specific embodiment
Below in conjunction with the drawings and specific embodiments to the detailed description of the invention.
Fig. 1 is a liquid coolant defrosting and refrigeration system schematic diagram of the present invention, comprises first evaporimeter 1, second evaporimeter 16, first heating power expansion valve 2, second heating power expansion valve 15, first check valve 4, second check valve 14, first magnetic valve 12, second magnetic valve 3, the 3rd magnetic valve 5, the 4th magnetic valve 11, the 5th magnetic valve 13, the 6th magnetic valve 6, compressor 7, condenser 8, high pressure reservoir 9, drier 10.The outlet of compressor 7 is connected with the refrigerant inlet of condenser 8, the refrigerant outlet of condenser 8 is connected with the inlet of high pressure reservoir 9, the outlet of high pressure reservoir 9 is connected with the inlet of drier 10, the outlet of drier 10 is connected with the 4th magnetic valve 11 inlets with first magnetic valve, 12 inlets respectively, first magnetic valve 12 is connected with the outlet of second heating power expansion valve 15 and the refrigerant inlet of second evaporimeter 16 respectively by threeway, the refrigerant outlet of second evaporimeter 16 is connected with the inlet of the 6th magnetic valve 6 with second magnetic valve, 3 inlets respectively by threeway, the outlet of second magnetic valve 3 is connected with first check valve, 4 inlets, 4 outlets of first check valve are connected with first heating power expansion valve, 2 inlets, 2 outlets of first heating power expansion valve export with the 4th magnetic valve 11 with the refrigerant inlet of first evaporimeter 1 respectively by threeway and are connected, the refrigerant outlet of first evaporimeter 1 is connected with the 5th magnetic valve 13 inlets with the 3rd magnetic valve 5 inlets respectively by threeway, 6 outlets are connected 5 outlets of the 3rd magnetic valve with the 6th magnetic valve with compressor 7 inlets respectively by threeway, 13 outlets of the 5th magnetic valve are connected with second check valve, 14 inlets, 14 outlets of second check valve are connected with second heating power expansion valve, 15 inlets, the temperature-sensitive bag of first heating power expansion valve is installed in the refrigerant outlet pipeline of first evaporimeter, and the temperature-sensitive bag of second heating power expansion valve is installed in the refrigerant outlet pipeline of second evaporimeter.Wherein, first evaporimeter and second evaporimeter are respectively finned-tube evaporator.
In the refrigeration system of the present invention, first evaporimeter is connected with the magnetic valve group with second evaporimeter, keying by magnetic valve realizes refrigeration and the switching that defrosts between two evaporimeters, when first magnetic valve, second magnetic valve, the 3rd magnetic valve are opened, when the 4th magnetic valve, the 5th magnetic valve, the 6th closed electromagnetic valve, first evaporimeter freezes, and second evaporimeter defrosts; When first magnetic valve, second magnetic valve, the 3rd closed electromagnetic valve, when the 4th magnetic valve, the 5th magnetic valve, the unlatching of the 6th magnetic valve, first evaporimeter defrosts, and second evaporimeter freezes.In addition, on pipeline, be provided with two check valves, prevent that high pressure liquid refrigerant from directly entering low-pressure section.
When first evaporimeter as refrigerating evaporator, when second evaporimeter was the defrosting evaporimeter, concrete cyclic process was: first magnetic valve, second magnetic valve, the 3rd magnetic valve are opened the 4th magnetic valve, the 5th magnetic valve, the 6th closed electromagnetic valve.The high temperature and high pressure gaseous refrigerant that compressor is discharged becomes the liquid cold-producing medium of HTHP after the condensation in condenser, enter second evaporimeter through high pressure reservoir, drier, first magnetic valve, high-temperature high-pressure refrigerant absorbs frost layer cold in second evaporimeter, became the liquid cold-producing medium of cold HTHP, by second magnetic valve after first check valve enters the first heating power heating power expansion valve and carries out the throttling step-down, become the low-temp low-pressure liquid refrigerant, enter first evaporimeter and evaporation, realize cool-down dehumidification, get back to compressor by the 3rd magnetic valve then.
When first evaporimeter frosting to a certain degree after, close first magnetic valve, second magnetic valve, the 3rd magnetic valve, open the 4th magnetic valve, the 5th magnetic valve, the 6th magnetic valve.The high temperature and high pressure gaseous refrigerant that compressor is discharged becomes the liquid cold-producing medium of HTHP after the condensation in condenser, enter first evaporimeter through high pressure reservoir, drier, the 4th magnetic valve, cold-producing medium absorbs frost layer cold in first evaporimeter, became the liquid cold-producing medium of cold HTHP, by the 5th magnetic valve after second check valve enters second heating power expansion valve and carries out the throttling step-down, become the low-temp low-pressure liquid refrigerant, enter second evaporator evaporation, realize cool-down dehumidification, the cold-producing medium after the evaporation is got back to compressor through the 6th magnetic valve.First evaporimeter is the defrosting evaporimeter, and second evaporimeter then plays the refrigerated dehumidification effect, so switches the Temperature and Humidity Control that realizes controlled room between two evaporimeters.
Fig. 2 is the tephigram of liquid coolant defrosting and refrigeration system of the present invention, and Fig. 3 is the pressure-enthalpy chart of liquid coolant defrosting and refrigeration system of the present invention, and among the figure: T is that refrigerant temperature, S are entropy, the q of cold-producing medium
0Be refrigerating capacity, Δ q
0The recruitment of refrigerating capacity, Wc are that compressor consumed work, h are that enthalpy, the P of cold-producing medium is refrigerant pressure, P
kBe condensing pressure, P
0Be evaporating pressure.Process 1 → 2 → 3 → 4 → 5 → 1 is for using the regular circulation of an evaporimeter in refrigeration and defrost process, and 1 → 2 → 3 → 4 → 4 ' → 5 ' → 5 → 1 are the circulation of liquid coolant defrosting and refrigeration system of the present invention.Cold-producing medium is compressed into the gas of HTHP after process 2-3-4 in compressor, high-temperature high-pressure refrigerant gas is condensed into cryogenic high pressure liquid in condenser, it is imported the frosting evaporimeter carry out defrosting, simultaneously cold-producing medium obtains to a certain degree cold excessively, and process 4-4 ' is highly pressurised liquid further cooling procedure in the frosting evaporimeter; , enter evaporimeter and absorb external heat and evaporate and become saturated gas, thereby sucked through the throttling step-down through cold excessively high pressure liquid refrigerant by compressor.
As can be seen from the figure, compare with regular circulation 1 → 2 → 3 → 4 → 5 → 1, throttling process by 4 → 5 become 4 ' → 5 ', specific refrigerating effect has increased Δ q
0(being area 5 ' 5bc5 in the tephigram, pressure-enthalpy chart middle conductor 5 ' 5).And the theoretical merit W of the unit of two circulations
0Do not increase, compare with conventional system, the coefficient of refrigerating performance of liquid coolant defrosting and refrigeration system increases.In common operating temperature range, for R22, cold 1 ℃ of every mistake, the percentage that coefficient of refrigerating performance increases is about 0.85%.
The switching that first evaporimeter and second evaporimeter freeze and defrost by the action of magnetic valve group, if there are a plurality of evaporimeters, then that evaporimeter is in parallel with first evaporimeter or second evaporimeter or be connected in series, a plurality of evaporimeters after parallel connection or the series connection as a whole, integral body is freezed or is defrosted, and can reach refrigeration and the switching that defrosts between a plurality of evaporimeters equally.
From the principle of liquid coolant defrosting refrigeration system of the present invention as can be seen, double evaporators liquid coolant defrosting refrigeration system has the outstanding advantage of the following aspects theoretically:
1. cold recovery function.In the refrigerating plant of double evaporators, geothermal liquid refrigerant in the high pressure that uses in the defrosting process is delivered to by the defrosting evaporimeter from the high pressure reservoir, and carry out heat exchange with the frost of evaporator surface, frost is melted gradually, and the liquid in the evaporimeter is cooled, and we were referred to as cold.Send into the evaporimeter of refrigeration after the subcooled liquid process heating power heating power expansion valve throttling step-down.Go up from the theory T of this process-S figure and 1gP-h figure and can find out significantly that the refrigerant enthalpy that enters evaporimeter reduces, and the not variation of the enthalpy of evaporator outlet, specific refrigerating effect increase, the increase of COP value.
2. heat defrosting in evaporimeter inside, defrosting is even, and is less to the influence of evaporimeter.Liquid coolant defrosting and hot gas defrosting all belong to inner defrosting, and heat is directly passed to the evaporation tube Guan Bi of evaporimeter by the convection current of liquid coolant, and the frost layer of outer surface also mainly is attached to the root of evaporation tube outer surface and fin, so defrosting is even.The evaporimeter that is used to cool off air in the refrigeration system mostly is finned-tube evaporator greatly, evaporation tube is that copper pipe, fin are aluminium matter, because the coefficient of expansion difference of two kinds of materials, the expansion direction difference, heating and cooling effect meeting increases the gap between evaporation tube and the fin in the defrosting process, and the heat exchange property of evaporimeter descends.The temperature of liquid coolant has only 1/3～1/2 of refrigeration compressor delivery temperature in the refrigeration system of the present invention, and influence has reducing of corresponding ratio to the heat transfer property of evaporimeter.
3. stopped thoroughly that hot gas in the hot gas defrosting condenses and the shortcoming of drainage system complexity.The control that normally needs of hot gas defrosting is not liquefied by the gas coolant of defrosting evaporator outlet, if there is not effective control device, just needs equipment input and system's control operation difficulty of increase system.Refrigeration system of the present invention adopts its thermal source of liquid coolant defrosting method different with hot gas defrosting, can thoroughly stop condensation and discharge opeing problem.
The energy that liquid coolant defrosting and refrigeration system of the present invention has utilized liquid coolant to waste in throttling process has reclaimed the frost layer cold that is accumulated in evaporator surface, is the effective ways that energy reclaims in the refrigerating plant.
Although relate to a kind of liquid coolant defrosting and refrigeration system and carried out special description disclosed with reference to embodiment, embodiment described above is illustrative and not restrictive, under the situation that does not break away from the spirit and scope of the present invention, all variations and modification are all within the scope of the present invention.
Claims (2)
1. liquid coolant defrosting and refrigeration system, it is characterized in that, the outlet of compressor and condenser, the high pressure reservoir, drier connects successively, the outlet of described drier is connected with the 4th electromagnetic valve entrance with first electromagnetic valve entrance respectively, described first electromagnetic valve outlet is connected with the outlet of second heating power expansion valve and the refrigerant inlet of second evaporimeter respectively by threeway, the refrigerant outlet of described second evaporimeter is connected with the 6th electromagnetic valve entrance with second electromagnetic valve entrance respectively by threeway, described second electromagnetic valve outlet is connected with the first thermal expansion valve inlet by first check valve, the described first thermal expansion valve outlet port is connected with the 4th electromagnetic valve outlet with the refrigerant inlet of first evaporimeter respectively by threeway, the refrigerant outlet of described first evaporimeter is connected with the 5th electromagnetic valve entrance with the 3rd electromagnetic valve entrance respectively by threeway, described the 3rd electromagnetic valve outlet is connected with the 6th electromagnetic valve outlet with the suction port of compressor respectively by threeway, described the 5th electromagnetic valve outlet is connected with the second thermal expansion valve inlet by second check valve, the temperature-sensitive bag of first heating power expansion valve is installed in the refrigerant outlet pipeline of first evaporimeter, and the temperature-sensitive bag of second heating power expansion valve is installed in the refrigerant outlet pipeline of second evaporimeter.
2. according to right 1 described liquid coolant defrosting and refrigeration system, it is characterized in that described first evaporimeter and second evaporimeter are respectively finned-tube evaporator.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA200810152328XA CN101368777A (en) | 2008-10-14 | 2008-10-14 | Liquid coolant defrosting and refrigeration system |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA200810152328XA CN101368777A (en) | 2008-10-14 | 2008-10-14 | Liquid coolant defrosting and refrigeration system |
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| CN101368777A true CN101368777A (en) | 2009-02-18 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103759456A (en) * | 2014-01-27 | 2014-04-30 | 平武臣 | Heat exchange system of air conditioner or heat pump and defrosting method of heat exchange system |
| CN107449226A (en) * | 2017-06-22 | 2017-12-08 | 北京航天试验技术研究所 | A kind of quick-fried pearl drying box |
| CN109631442A (en) * | 2018-12-20 | 2019-04-16 | 广州美的华凌冰箱有限公司 | Refrigerating plant, the control method of refrigerating plant, system and storage medium |
| CN109682114A (en) * | 2018-12-12 | 2019-04-26 | 浙江理工大学 | The compression-absorption combined heat pump system of engine fuel driving |
| CN110736216A (en) * | 2019-09-27 | 2020-01-31 | 青岛海尔空调器有限总公司 | Control method and control device for defrosting of air conditioner and air conditioner |
-
2008
- 2008-10-14 CN CNA200810152328XA patent/CN101368777A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103759456A (en) * | 2014-01-27 | 2014-04-30 | 平武臣 | Heat exchange system of air conditioner or heat pump and defrosting method of heat exchange system |
| CN107449226A (en) * | 2017-06-22 | 2017-12-08 | 北京航天试验技术研究所 | A kind of quick-fried pearl drying box |
| CN109682114A (en) * | 2018-12-12 | 2019-04-26 | 浙江理工大学 | The compression-absorption combined heat pump system of engine fuel driving |
| CN109631442A (en) * | 2018-12-20 | 2019-04-16 | 广州美的华凌冰箱有限公司 | Refrigerating plant, the control method of refrigerating plant, system and storage medium |
| CN110736216A (en) * | 2019-09-27 | 2020-01-31 | 青岛海尔空调器有限总公司 | Control method and control device for defrosting of air conditioner and air conditioner |
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Open date: 20090218 |