CN103486754B - A kind of energy-conservation middle temperature cold-producing medium/middle temperature cold-producing medium cascade refrigeration system - Google Patents
A kind of energy-conservation middle temperature cold-producing medium/middle temperature cold-producing medium cascade refrigeration system Download PDFInfo
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- CN103486754B CN103486754B CN201310376749.1A CN201310376749A CN103486754B CN 103486754 B CN103486754 B CN 103486754B CN 201310376749 A CN201310376749 A CN 201310376749A CN 103486754 B CN103486754 B CN 103486754B
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Abstract
The invention discloses a kind of energy-conservation middle temperature cold-producing medium/middle temperature cold-producing medium cascade refrigeration system, comprise high-temperature level refrigeration cycle and the low-temperature level refrigeration cycle of being carried out heat exchange by condenser/evaporator.High-temperature level refrigeration branch is set up in high-temperature level refrigeration cycle.High-temperature level refrigeration cycle and low-temperature level refrigeration cycle adopt warm cold-producing medium in same, and share same evaporimeter, realize switching by the keying of magnetic valve.Remarkable result of the present invention is: coefficient of refrigerating performance is high, and high-temperature level operating mode and low-temperature level operating mode can carry out cooling, economize energy respectively, reduces operating cost, improves utilization rate of equipment and installations.
Description
Technical field
The present invention relates to environmental-test facility and freezer refrigerating field, be specially a kind of energy-conservation middle temperature cold-producing medium/middle temperature cold-producing medium cascade refrigeration system of more than-60 DEG C total temperature operating modes.
Background technology
In steam compression type refrigeration circulation, due to the restriction of kind of refrigeration cycle compression ratio and cold-producing medium thermophysical property, conventional single stage compress kind of refrigeration cycle can only obtain the low temperature of-20--40 DEG C, if obtain the low temperature of-40--60 DEG C, the two-stage compression refrigeration circulation of warm cold-producing medium in many employings, when needing the low temperature obtaining less than-50 DEG C, the kind of refrigeration cycle of warm cold-producing medium and low-temperature refrigerant overlapping in employing; Many scholar's research results show, at-40--60 DEG C of warm area, adopt double-click compression refrigeration circulation refrigerating efficiency can circulate higher than cascade refrigeration, and cascade refrigeration circulate in less than-60 DEG C warm area refrigeration can be advantageously.
In high/low temperature environmental simulation testing equipment, because temperature test point will often change.Double-stage compressive refrigerating system and cascade refrigeration system need to start two-stage compressor always and just meet refrigeration, and unnecessary refrigeration needs to provide heating power to go balance, so just causes larger energy waste.At present, cascade refrigeration system can carry out high-temperature level by the mode of double evaporators and low-temperature level is freezed respectively, but can cause the problem improving equipment investment cost and the increase of automatic control point like this; In addition, cascade refrigeration system adopts low-temperature refrigerant, all can be vaporizated into superheated steam at normal temperatures, bring potential safety hazard to whole refrigeration system.
Summary of the invention
For prior art Problems existing, the present invention, in conjunction with two-stage compression refrigeration and cascade refrigeration advantage, provides a kind of energy-conservation middle temperature cold-producing medium/middle temperature cold-producing medium cascade refrigeration system, to reach economize energy, reduces the object of equipment investment and raising utilization rate of equipment and installations.
In order to achieve the above object, the technical solution adopted in the present invention is:
A kind of energy-conservation middle temperature cold-producing medium/middle temperature cold-producing medium cascade refrigeration system, is comprised high-temperature level refrigeration cycle and the low-temperature level refrigeration cycle of being carried out heat exchange by condenser/evaporator, it is characterized in that: high-temperature level refrigeration cycle also has additional high-temperature level refrigeration branch.
The energy-conservation middle temperature cold-producing medium of described one/middle temperature cold-producing medium cascade refrigeration system, it is characterized in that: described high-temperature level refrigeration cycle comprises the high-temperature level compressor, high-temperature level oil eliminator, high-temperature level water storage type water condenser, high-temperature level device for drying and filtering, high-temperature level first magnetic valve, high-temperature level first expansion valve, the condenser/evaporator that are connected successively by pipeline, and the other end of condenser/evaporator is connected to the suction end of high-temperature level compressor.
The energy-conservation middle temperature cold-producing medium of described one/middle temperature cold-producing medium cascade refrigeration system, it is characterized in that: described low-temperature level refrigeration cycle is: low-temperature level compressor outlet connects low-temperature level water precooler, low-temperature level oil eliminator, condenser/evaporator, low-temperature level fluid reservoir, low-temperature level device for drying and filtering, magnetic valve, expansion valve, evaporimeter successively, the outlet of evaporimeter is connected with low-temperature level compressor air suction end.
The energy-conservation middle temperature cold-producing medium of described one/middle temperature cold-producing medium cascade refrigeration system, it is characterized in that: described high-temperature level refrigeration branch be from high-temperature level fluid reservoir cold-producing medium out after high-temperature level second magnetic valve, high-temperature level second expansion valve, enter evaporimeter 18 again, eventually pass on the pipeline between high-temperature level the 3rd magnetic valve access condenser/evaporator and high-temperature level compressor.
The energy-conservation middle temperature cold-producing medium of described one/middle temperature cold-producing medium cascade refrigeration system, is characterized in that: high-temperature level refrigeration cycle and low-temperature level refrigeration cycle cold-producing medium used are same cold-producing medium.
The energy-conservation middle temperature cold-producing medium of described one/middle temperature cold-producing medium cascade refrigeration system, is characterized in that: high-temperature level refrigeration cycle and low-temperature level refrigeration cycle share same evaporimeter.
Advantage of the present invention is: (1). in-60 DEG C of-5 DEG C of temperature ranges, the coefficient of refrigerating performance of middle temperature cold-producing medium/middle temperature cold-producing medium cascade refrigeration system is higher than double-stage compressive refrigerating system and cascade refrigeration system.
(2). low-temperature level operating mode can be adopted to provide cold, also can only start high-temperature level compressor and cold is provided, be particularly suitable for wide warm area to change and the high/low temperature environmental simulation experimental facilities needing accurate temperature controlling, play and reduce plant capacity consumption, energy-conservation effect.
(3). low-temperature level refrigeration cycle and high-temperature level refrigeration branch share an evaporimeter, realize switching, reduce the quantity at equipment investment cost and automatic control point, improve the utilization rate of equipment by the keying of magnetic valve.
Accompanying drawing explanation
Fig. 1 is the energy-conservation middle temperature cold-producing medium of the present invention/middle temperature cold-producing medium cascade refrigeration system structural principle schematic diagram.
Detailed description of the invention
As shown in Figure 1.The present invention includes high-temperature level refrigeration cycle 01 and low-temperature level refrigeration cycle 02, high-temperature level refrigeration cycle includes the high-temperature level compressor 1, high-temperature level oil eliminator 2, high-temperature level water storage type water condenser 3, high-temperature level device for drying and filtering 4, high-temperature level first magnetic valve 5, high-temperature level first expansion valve 6, the condenser/evaporator 7 that are connected successively by pipeline, and the other end of condenser/evaporator 7 is connected to the suction end of high-temperature level compressor 1.Low-temperature level refrigeration cycle is, low-temperature level compressor 11 exports and connects low-temperature level water precooler 12, low-temperature level oil eliminator 13, condenser/evaporator 7, low-temperature level fluid reservoir 14, low-temperature level device for drying and filtering 15, magnetic valve 16, expansion valve 17, evaporimeter 18 successively, and the outlet of evaporimeter 18 is connected with low-temperature level compressor air suction end.In addition, high-temperature level feed flow branch road is set up in high-temperature level refrigeration cycle.
In the present invention, high-temperature level refrigeration branch comprises high-temperature level second magnetic valve 8, high-temperature level second expansion valve 9, evaporimeter 18 and high-temperature level the 3rd magnetic valve 10 that connect successively, wherein between high-temperature level second magnetic valve access high-temperature level device for drying and filtering and high-temperature level first magnetic valve on pipeline; High-temperature level the 3rd magnetic valve 10 accesses on the pipeline between condenser/evaporator 7 and high-temperature level compressor 1.
This refrigeration system course of work of the present invention is as follows:
1.-15 DEG C and more than-15 DEG C refrigeration: adopt high-temperature level operating mode cooling, cold-producing medium enters high-temperature level oil eliminator after high-temperature level compressor compresses, then the cooling of high-temperature level water storage type water condenser is entered, evaporimeter is entered again through the throttling of high-temperature level second expansion valve, absorb the heat of operating room, be inhaled into high-temperature level compressor after being vaporized into superheated vapor, complete circulation.Low-temperature level compressor does not work.
2.-60 DEG C--the refrigeration between 15 DEG C: adopt low-temperature level operating mode cooling, high-temperature level refrigeration cycle 01 provides cold by compression, condensation, throttling, evaporation process for condenser/evaporator 7; Cold-producing medium after low-temperature level compressor compresses enters low-temperature level water precooler, then enter low-temperature level oil eliminator, then be cooled through condenser/evaporator, then enter through reducing pressure by regulating flow the heat that evaporimeter absorbs workplace, be inhaled into low-temperature level compressor after being vaporized into superheated vapor, complete circulation.
3. close high-temperature level first magnetic valve, open high-temperature level second magnetic valve and high-temperature level the 3rd magnetic valve, realize high-temperature level for operating mode cooling, open high-temperature level first magnetic valve, open high-temperature level second magnetic valve and high-temperature level the 3rd magnetic valve realizes low-temperature level operating mode refrigeration.
Take refrigerating capacity as 40KW, cold-producing medium is R404A, and condensation temperature is 40 DEG C, and evaporating temperature is-50 DEG C is example, coefficient of refrigerating performance is carried out to middle temperature cold-producing medium of the present invention/middle temperature cold-producing medium cascade refrigeration system and double-stage compressive refrigerating system, COP, shaft power calculates, the results are shown in Table 1.
Suppose that refrigerant system runs 24h in given operating mode, conventional double-stage compressive refrigerating system energy ezpenditure is 35.2*24=844.8kw.The present invention is freezed more than-15 DEG C and-15 DEG C, and only need carry out high-temperature level operating mode refrigeration, consumption energy consumption is 16.2*24=388.8kw;-60 DEG C--during 15 DEG C of refrigeration, energy ezpenditure is: 24.61*24=590.64kw.
By compared with conventional double-stage compressive refrigerating system, the energy-conservation middle temperature cold-producing medium of the present invention/middle temperature cold-producing medium cascade refrigeration system energy-saving effect is remarkable:
When freezing for more than-15 DEG C and-15 DEG C, energy-conservation ratio: (844.8-388.8)/844.8*100%=53.98%
When-60--15 DEG C of refrigeration, energy-conservation ratio: (844.8-590.64)/844.8*100%=30.09%
Claims (1)
1. energy-conservation middle temperature cold-producing medium/middle temperature cold-producing medium cascade refrigeration system, is comprised high-temperature level refrigeration cycle and the low-temperature level refrigeration cycle of being carried out heat exchange by condenser/evaporator, it is characterized in that: high-temperature level refrigeration cycle also has additional high-temperature level refrigeration branch; Described high-temperature level refrigeration cycle comprises the high-temperature level compressor, high-temperature level oil eliminator, high-temperature level water storage type water condenser, high-temperature level device for drying and filtering, high-temperature level first magnetic valve, high-temperature level first expansion valve, the condenser/evaporator that are connected successively by pipeline, and the other end of condenser/evaporator is connected to the suction end of high-temperature level compressor; Described low-temperature level refrigeration cycle is: low-temperature level compressor outlet connects low-temperature level water precooler, low-temperature level oil eliminator, condenser/evaporator, low-temperature level fluid reservoir, low-temperature level device for drying and filtering, magnetic valve, expansion valve, evaporimeter successively, and the outlet of evaporimeter is connected with low-temperature level compressor air suction end; Described high-temperature level refrigeration branch be from high-temperature level fluid reservoir cold-producing medium out after high-temperature level second magnetic valve, high-temperature level second expansion valve, enter evaporimeter again, eventually pass on the pipeline between high-temperature level the 3rd magnetic valve access condenser/evaporator and high-temperature level compressor; High-temperature level refrigeration cycle and low-temperature level refrigeration cycle cold-producing medium used are same cold-producing medium; High-temperature level refrigeration cycle and low-temperature level refrigeration cycle share same evaporimeter.
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