WO2018034846A1 - Refrigeration display case, refrigeration system and thermostatic control method - Google Patents

Refrigeration display case, refrigeration system and thermostatic control method Download PDF

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Publication number
WO2018034846A1
WO2018034846A1 PCT/US2017/045112 US2017045112W WO2018034846A1 WO 2018034846 A1 WO2018034846 A1 WO 2018034846A1 US 2017045112 W US2017045112 W US 2017045112W WO 2018034846 A1 WO2018034846 A1 WO 2018034846A1
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WO
WIPO (PCT)
Prior art keywords
refrigeration
evaporator
suction temperature
saturated suction
display cabinet
Prior art date
Application number
PCT/US2017/045112
Other languages
French (fr)
Inventor
Chaochang Zhang
Qianli Fu
Original Assignee
Carrier Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Carrier Corporation filed Critical Carrier Corporation
Priority to EP17751219.1A priority Critical patent/EP3500808A1/en
Publication of WO2018034846A1 publication Critical patent/WO2018034846A1/en

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47F—SPECIAL FURNITURE, FITTINGS, OR ACCESSORIES FOR SHOPS, STOREHOUSES, BARS, RESTAURANTS OR THE LIKE; PAYING COUNTERS
    • A47F3/00—Show cases or show cabinets
    • A47F3/04—Show cases or show cabinets air-conditioned, refrigerated
    • A47F3/0439—Cases or cabinets of the open type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/022—Compressor control arrangements
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47F—SPECIAL FURNITURE, FITTINGS, OR ACCESSORIES FOR SHOPS, STOREHOUSES, BARS, RESTAURANTS OR THE LIKE; PAYING COUNTERS
    • A47F3/00—Show cases or show cabinets
    • A47F3/04—Show cases or show cabinets air-conditioned, refrigerated
    • A47F3/0478—Control or safety arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B39/00—Evaporators; Condensers
    • F25B39/02—Evaporators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/006—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass for preventing frost
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/04—Preventing the formation of frost or condensate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/22—Refrigeration systems for supermarkets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/01—Geometry problems, e.g. for reducing size
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/025—Compressor control by controlling speed
    • F25B2600/0251—Compressor control by controlling speed with on-off operation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/197—Pressures of the evaporator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2117—Temperatures of an evaporator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2117—Temperatures of an evaporator
    • F25B2700/21175—Temperatures of an evaporator of the refrigerant at the outlet of the evaporator

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
  • Defrosting Systems (AREA)

Abstract

The present invention provides a refrigeration display cabinet, a refrigeration system and a constant temperature control method. The refrigeration display cabinet includes: a refrigeration loop (110), including a compressor (111), a condenser (112), a throttling element (113) and an evaporator (114) which are connected in sequence through pipelines; and a control device (120) communicated with the refrigeration loop and used for directly or indirectly controlling the saturated suction temperature of the refrigeration loop in a preset threshold value range of -2 DEG C to +2 DEG C, wherein the evaporator is a finned heat exchanger, and has a fin density of not less than 6FPI. The refrigeration loop can provide high enough refrigeration capacity for the refrigeration display cabinet and avoid a frosting problem of the fins of the evaporator, thus avoiding a frosting blockage problem of the fins.

Description

REFRIGERATION DISPLAY CASE, REFRIGERATION SYSTEM AND
THERMOSTATIC CONTROL METHOD
TECHNICAL FIELD
[0001] The present invention relates to the field of refrigeration equipment, and more specifically, to refrigeration equipment capable of realizing constant temperature control.
BACKGROUND ART
[0002] In order to facilitate freshness retaining and displaying of cargoes, a refrigeration display cabinet emerges at the right moment and has been developed for many years. At the present, there are various kinds of refrigeration display cabinets, such as an island- type display cabinet and a vertical-type display cabinet. Most of the refrigeration display cabinets are used for providing a display space for a customer to observe and select the cargoes, and meanwhile, the cabinets need to provide a relatively constant temperature environment for the cargoes so as to preserve the cargoes as long as possible. Furthermore, the constant temperature environment is generally at a relatively low temperature, thereby a refrigeration system is required to meet the requirement of the refrigeration display cabinet for the low temperature environment.
[0003] During conventional design of the refrigeration display cabinet, the saturated suction temperature of a compressor is -3 DEG C to -10 DEG C. In such type of design, as the saturated suction temperature is relatively low, the phenomenon that coil pipes or fins of an evaporator are frosted would be caused, which would affect the heat exchange performance. In order to avoid the problem of heat exchange blockage caused by frosting, generally, a relatively low fin density, namely a relatively small FPI (for example, the fin density is less than 6FPI), is designed in the evaporator, and this is because when the distance between the fins is extremely small, less frosting would easily cause the blockage problem; and meanwhile, it still needs to perform defrosting at a specific frequency. During defrosting, external heat would be introduced, which leads to waste of energy. Meanwhile, the defrosting would increase the temperature of the evaporator, and then temperature of air in the refrigeration display cabinet exchanging heat with the evaporator is increased, which would bring bad influence on some cargoes (such as food) with relatively high constant temperature requirements. SUMMARY OF THE INVENTION
[0004] The present invention aims to provide a defrosting-free refrigeration display cabinet.
[0005] The present invention also aims to provide a defrosting-free refrigeration system.
[0006] The present invention also aims to provide a constant temperature control method.
[0007] According to one aspect of the present invention, provided is a refrigeration display cabinet, which includes: a refrigeration loop, including a compressor, a condenser, a throttling element and an evaporator which are connected in sequence through pipelines; and a control device communicated with the refrigeration loop and used for directly or indirectly controlling the saturated suction temperature of the refrigeration loop in a preset threshold value range of -2 DEG C to +2 DEG C, wherein the evaporator is a finned heat exchanger, and has a fin density of not less than 6FPI.
[0008] According to another aspect of the present invention, also provided is a refrigeration system, which includes: a refrigeration loop, including a compressor, a condenser, a throttling element and an evaporator which are connected in sequence through pipelines; and a control device communicated with the refrigeration loop and used for directly or indirectly controlling the saturated suction temperature of the refrigeration loop in a preset threshold value range of -2 DEG C to +2 DEG C, wherein the evaporator is a finned heat exchanger, and has a fin density of not less than 6FPI.
[0009] According to a further aspect of the present invention, also provided is a constant temperature control method, which includes: a parameter acquisition step S 100, acquiring a monitoring parameter which directly or indirectly reflects the saturated suction temperature of a refrigeration loop; a comparison step S200, comparing the monitoring parameter with a preset monitoring parameter value; and a control step S300, directly or indirectly controlling the saturated suction temperature of the refrigeration loop in a preset threshold value range of -2 DEG C to +2 DEG C according to a comparison result.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Fig. 1 is a schematic diagram of a refrigeration display cabinet of one embodiment of the present invention.
[0011] Fig. 2 is a schematic diagram of a refrigeration loop in a refrigeration display cabinet of one embodiment of the present invention. DETAILED DESCRIPTION
[0012] Fig. 1 shows a refrigeration display cabinet 100, which includes: a refrigeration loop 110 for providing refrigeration capacity for cargoes to be stored and a control device for providing constant temperature control for the refrigeration loop 110. Under the assistance of the control device, the refrigeration loop 110 can provide high enough refrigeration capacity for the refrigeration display cabinet 100 and avoid a frosting problem of the fins of an evaporator 114, thus avoiding a frosting blockage problem of the fins.
[0013] To be more specific, as shown in Fig. 2, the refrigeration loop 110 includes a compressor 111, a condenser 112, a throttling element 113 and an evaporator 114 which are connected in sequence through pipelines, and further includes a control device communicated with the refrigeration loop 110 and used for directly or indirectly controlling the saturated suction temperature of the refrigeration loop 110 in a preset threshold value range of -2 DEG C to +2 DEG C, wherein the evaporator 114 is a finned heat exchanger, and has a fin density of not less than 6FPI. At the moment, as the saturated suction temperature of the refrigeration loop 110 is controlled at -2 DEG C to +2 DEG C, the refrigeration loop 110 has higher saturated suction temperature in comparison with the existing conventional designed range of -3 DEG C to -10 DEG C, that is, the refrigeration loop 110 is not liable to frost. Similarly, due to the relatively high saturated suction temperature, the refrigeration capacity brought by a single fin is also relatively decreased. At this moment, by further increasing the fin density of the evaporator 114, namely by designing the fin density to be not less than 6FPI, the concept of the present invention improves the total refrigeration capacity of the evaporator 114 and also enables it to reach a range required for use. Correspondingly, the saturated suction temperature is increased, so that no frosting problem caused by reduction of fin spacing will occur again even if the fin density is reincreased. To sum up, under a condition of keeping the effective working refrigeration capacity of the refrigeration display cabinet 100 not changed, this concept of the present invention, on one hand, avoids the frosting problem, thus avoiding sudden rise and sudden drop of temperature caused by defrosting and improving the quality of cargoes which need constant temperature storage. On the other hand, it eliminates an extra defrosting branch allocated for defrosting and an extra part of heat provided for defrosting, thus reducing the part cost and the energy loss.
[0014] Further improvement on each element or the overall structure in the embodiment will be described as follows.
[0015] Optionally, for the fin density of the evaporator 114, provided is a group of specific design examples. For example, the fin density applied in this embodiment is between 6FPI and 25FPI (fins per inches). It takes into account that an extremely large density will greatly increase wind resistance of air flow flowing by, and it is not good for heat exchange. Therefore, the above-mentioned range is a relatively reasonable range obtained after actual measurement. More specifically, the fin density of the evaporator 114 is substantially 11FPI. The 'substantially' herein represents adaptability to a deviation existing between a theoretical design and an actual structure. For example, in some cases, although the fin density of the evaporator 114 is intended to be designed to be 11FPI, the actual fin density is 11.3FPI or 10.9FPI due to its machining precision, design deviation and other problems. At the moment, the evaporator 114 should be still considered as conforming to the situation that the fin density is substantially 11FPI.
[0016] Optionally, the control device here can adopt a frequency converter 120, which can control the operating frequency, namely the operating speed, of a variable-frequency compressor 111, so as to adjust the operating frequency to control the saturated suction temperature in a reasonable range.
[0017] Optionally, the control device should control the saturated suction temperature according to a parameter acquired by the control device. The parameter is not specifically a certain parameter, and is available if only it can reflect the current state and a change trend of the saturated suction temperature.
[0018] For instance, in one example, the refrigeration display cabinet 100 further includes a pressure sensor 115 for detecting evaporation pressure of the evaporator 114. The control device can indirectly control the saturated suction temperature of the refrigeration loop 110 in the preset threshold value range according to a relation between the evaporation pressure and the saturated suction temperature. Further, in order to acquire the parameter more accurately and conveniently, the pressure sensor 115 can be disposed close to an outlet pipeline of the evaporator 114.
[0019] As in another example, the refrigeration display cabinet 100 further includes a temperature sensor for detecting the saturated suction temperature of the evaporator 114. The control device can directly control the saturated suction temperature of the refrigeration loop 110 in the preset threshold value range according to the saturated suction temperature. Further, in order to acquire the parameter more accurately and conveniently, the temperature sensor can be disposed on a heat exchange pipeline of the evaporator 114.
[0020] Optionally, on the specific basis of the disposal of the refrigeration loop 110 in the refrigeration display cabinet 100, the evaporator 114 can be disposed at the bottom or the back of the refrigeration display cabinet 100, so that heat can be transferred into a cabinet body of the refrigeration display cabinet 100 more uniformly
[0021] According to the teaching of the above-mentioned embodiment, it can be deduced that the present invention can be not only applied to refrigeration display cabinet, and more widely, but also applied to various refrigeration systems with requirements for low constant temperature control.
[0022] Specifically, provided is an embodiment of a refrigeration system of this type. The refrigeration system should include: a refrigeration loop, including a compressor, a condenser, a throttling element and an evaporator which are connected in sequence through pipelines; and a control device communicated with the refrigeration loop and used for directly or indirectly controlling the saturated suction temperature of the refrigeration loop; the evaporator is a finned heat exchanger, and has a fin density of not less than 6FPI. It is similar to the circumstance in the above-mentioned embodiment that at the moment, as the saturated suction temperature of the refrigeration loop is controlled at -2 DEG C to +2 DEG C, the refrigeration loop has higher saturated suction temperature in comparison with the existing conventional designed range of -3 DEG C to -10 DEG C, that is, the refrigeration loop is not liable to frost. Similarly, due to the relatively high saturated suction temperature, the refrigeration capacity brought by a single fin is also relatively decreased. At this moment, by further increasing the fin density of the evaporator, namely by designing the fin density to be not less than 6FPI, this concept of the present invention improves the total refrigeration capacity of the evaporator and also enables it to reach a range required for use. Correspondingly, the saturated suction temperature is increased, so that no frosting problem caused by reduction of fin spacing will occur again even if the fin density is reincreased. To sum up, under a condition of keeping the effective working refrigeration capacity of the refrigeration display cabinet not changed, the concept of the present invention, on one hand, avoids the frosting problem, thus avoiding sudden rise and sudden drop of temperature caused by defrosting and improving the quality of cargoes which need constant temperature storage. On the other hand, it eliminates an extra defrosting branch allocated for defrosting and an extra part of heat provided for defrosting, thus reducing the part cost and the energy loss.
[0023] In addition, other further improvements which are not specific for elements or the overall structure of the refrigeration display cabinet in the above-mentioned embodiment can be also applicable to this embodiment, for example, the specific design of the fin density, for another example, the specific design of sensors, for further example, the specific design of a control object of the control device. [0024] In addition, in order to cooperate with the constant temperature application of the refrigeration display cabinet in the above-mentioned embodiment or other refrigeration systems, further provided is an applicable constant temperature control method, which includes: a parameter acquisition step S 100, acquiring a monitoring parameter which directly or indirectly reflects the saturated suction temperature of a refrigeration loop; a comparison step S200, comparing the monitoring parameter with a preset monitoring parameter value; and a control step S300, directly or indirectly controlling the saturated suction temperature of the refrigeration loop in a preset threshold value range of -2 DEG C to +2 DEG C according to a comparison result. More specifically, the control step S300 further includes: when the comparison result of the monitoring parameter with the preset monitoring parameter value reflects that the saturated suction temperature is higher than the preset threshold value range, increasing the rotating speed of a compressor in the refrigeration loop 110; and/or when the comparison result of the monitoring parameter with the preset monitoring parameter value reflects that the saturated suction temperature is lower than the preset threshold value range, decreasing the rotating speed of the compressor in the refrigeration loop. As the saturated suction temperature is controlled at -2 DEG C to +2 DEG C all the time, no frosting problem will be caused in the refrigeration loop, thereby sudden rise and sudden drop of temperature caused by defrosting is also avoided, and the quality of cargoes which need constant temperature storage is improved. On the other hand, an extra defrosting branch allocated for defrosting and an extra part of heat provided for defrosting are also eliminated, thus reducing the part cost and the energy loss.
[0025] Optionally, the monitoring parameter includes evaporation pressure and/or suction temperature. The suction temperature can directly reflect the saturated suction temperature of the refrigeration loop, but its measurement precision is relatively low, and correspondingly, relatively low material cost is realized. The measurement precision of evaporation pressure is relatively high, and the corresponding saturated suction temperature can be calculated through a formula, so that such indirect monitoring mode is generally adopted.
[0026] The above-mentioned examples mainly describe the refrigeration display cabinet, the refrigeration system and the constant temperature control method in the present invention. Although only some of the embodiments of the present invention are described, a person skilled in the art should understand that the present invention can be implemented in many other forms without departing from its subject and scope. Therefore, the presented examples and embodiments are regarded as being exemplary rather than limitary, and the present invention may cover various modifications and replacements without departing from the spirit and scope of the present invention defined by each attached claim.

Claims

1. A refrigeration display cabinet, characterized by comprising:
a refrigeration loop, comprising a compressor, a condenser, a throttling element and an evaporator which are connected in sequence through pipelines; and
a control device communicated with the refrigeration loop and used for directly or indirectly controlling the saturated suction temperature of the refrigeration loop in a preset threshold value range of -2 DEG C to +2 DEG C;
wherein the evaporator is a finned heat exchanger, and has a fin density of not less than 6FPI.
2. The refrigeration display cabinet according to claim 1, characterized in that the fin density of the evaporator is between 6FPI and 25FPI.
3. The refrigeration display cabinet according to claim 2, characterized in that the fin density of the evaporator is substantially 11FPI.
4. The refrigeration display cabinet according to any one of claims 1 to 3, characterized by further comprising a pressure sensor for detecting the evaporation pressure of the evaporator, wherein the control device indirectly controls the saturated suction temperature of the refrigeration loop in the preset threshold value range according to a relation between the evaporation pressure and the saturated suction temperature.
5. The refrigeration display cabinet according to claim 4, characterized in that the pressure sensor is disposed close to an outlet pipeline of the evaporator.
6. The refrigeration display cabinet according to any one of claims 1 to 3, characterized by further comprising a temperature sensor for detecting the saturated suction temperature of the evaporator, wherein the control device directly controls the saturated suction temperature of the refrigeration loop in the preset threshold value range according to the saturated suction temperature.
7. The refrigeration display cabinet according to claim 6, characterized in that the temperature sensor is disposed on a heat exchange pipeline of the evaporator.
8. The refrigeration display cabinet according to any one of claims 1 to 3, characterized in that the control device is configured to control the saturated suction temperature of the refrigeration loop by controlling the rotating speed of the compressor.
9. The refrigeration display cabinet according to any one of claims 1 to 3, characterized in that the evaporator is disposed at the bottom or the back of the refrigeration display cabinet.
10. A refrigeration system, characterized by comprising:
a refrigeration loop, comprising a compressor, a condenser, a throttling element and an evaporator which are connected in sequence through pipelines; and
a control device communicated with the refrigeration loop and used for directly or indirectly controlling the saturated suction temperature of the refrigeration loop in a preset threshold value range of -2 DEG C to +2 DEG C;
wherein the evaporator is a finned heat exchanger, and has a fin density of not less than 6FPI.
11. The refrigeration system according to claim 10, characterized in that the fin density of the evaporator is between 6FPI and 25FPI.
12. The refrigeration system according to claim 11, characterized in that the fin density of the evaporator is substantially 11FPI.
13. The refrigeration system according to any one of claims 10 to 12, characterized by further comprising a pressure sensor for detecting the evaporation pressure of the evaporator; and the control device indirectly controls the saturated suction temperature of the refrigeration loop in the preset threshold value range according to a relation between the evaporation pressure and the saturated suction temperature.
14. The refrigeration system according to claim 13, characterized in that the pressure sensor is disposed close to an outlet pipeline of the evaporator.
15. The refrigeration system according to any one of claims 10 to 12, characterized by further comprising a temperature sensor for detecting the saturated suction temperature of the evaporator; and the control device directly controls the saturated suction temperature of the refrigeration loop in the preset threshold value range according to the saturated suction temperature.
16. The refrigeration system according to claim 15, characterized in that the temperature sensor is disposed on a heat exchange pipeline of the evaporator.
17. The refrigeration system according to any one of claims 10 to 12, characterized in that the control device is configured to control the saturated suction temperature of the refrigeration loop by controlling the rotating speed of the compressor.
18. A constant temperature control method, characterized by comprising:
a parameter acquisition step S 100, acquiring a monitoring parameter which directly or indirectly reflects the saturated suction temperature of a refrigeration loop;
a comparison step S200, comparing the monitoring parameter with a preset monitoring parameter value; and
a control step S300, directly or indirectly controlling the saturated suction temperature of the refrigeration loop in a preset threshold value range of -2 DEG C to +2 DEG C according to a comparison result.
19. The constant temperature control method according to claim 18, characterized in that the monitoring parameter comprises evaporation pressure and/or suction temperature.
20. The constant temperature control method according to claim 18, characterized in that the control step S300 further comprises: when the comparison result of the monitoring parameter with the preset monitoring parameter value reflects that the saturated suction temperature is higher than the preset threshold value range, increasing the rotating speed of a compressor in the refrigeration loop; and/or when the comparison result of the monitoring parameter with the preset monitoring parameter value reflects that the saturated suction temperature is lower than the preset threshold value range, decreasing the rotating speed of the compressor in the refrigeration loop.
PCT/US2017/045112 2016-08-16 2017-08-02 Refrigeration display case, refrigeration system and thermostatic control method WO2018034846A1 (en)

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CN201610670396.X 2016-08-16
CN201610670396.XA CN107752587A (en) 2016-08-16 2016-08-16 Refrigerated display case, refrigeration system and constant-temperature control method

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11116333B2 (en) 2019-05-07 2021-09-14 Carrier Corporation Refrigerated display cabinet including microchannel heat exchangers
US11559147B2 (en) 2019-05-07 2023-01-24 Carrier Corporation Refrigerated display cabinet utilizing a radial cross flow fan

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