EP3500808A1 - Refrigeration display case, refrigeration system and thermostatic control method - Google Patents

Refrigeration display case, refrigeration system and thermostatic control method

Info

Publication number
EP3500808A1
EP3500808A1 EP17751219.1A EP17751219A EP3500808A1 EP 3500808 A1 EP3500808 A1 EP 3500808A1 EP 17751219 A EP17751219 A EP 17751219A EP 3500808 A1 EP3500808 A1 EP 3500808A1
Authority
EP
European Patent Office
Prior art keywords
refrigeration
evaporator
suction temperature
saturated suction
display cabinet
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
EP17751219.1A
Other languages
German (de)
French (fr)
Inventor
Chaochang Zhang
Qianli Fu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Carrier Corp
Original Assignee
Carrier Corp
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 Corp filed Critical Carrier Corp
Publication of EP3500808A1 publication Critical patent/EP3500808A1/en
Ceased legal-status Critical Current

Links

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
    • 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
    • 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
    • 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

Definitions

  • the present invention relates to the field of refrigeration equipment, and more specifically, to refrigeration equipment capable of realizing constant temperature control.
  • a refrigeration display cabinet 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.
  • 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.
  • 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.
  • the saturated suction temperature of a compressor is -3 DEG C to -10 DEG C.
  • 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.
  • a relatively low fin density namely a relatively small FPI (for example, the fin density is less than 6FPI)
  • the fin density is less than 6FPI
  • the present invention aims to provide a defrosting-free refrigeration display cabinet.
  • the present invention also aims to provide a defrosting-free refrigeration system.
  • the present invention also aims to provide a constant temperature control method.
  • 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.
  • 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.
  • 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.
  • Fig. 1 is a schematic diagram of a refrigeration display cabinet of one embodiment of the present invention.
  • Fig. 2 is a schematic diagram of a refrigeration loop in a refrigeration display cabinet of one embodiment of the present invention. DETAILED DESCRIPTION
  • 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.
  • 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.
  • 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.
  • the refrigeration capacity brought by a single fin is also relatively decreased.
  • 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.
  • this concept of the present invention 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.
  • 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.
  • the fin density of the evaporator 114 is a group of specific design examples.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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
  • 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.
  • 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.
  • 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.
  • the concept of the present invention 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.

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.
EP17751219.1A 2016-08-16 2017-08-02 Refrigeration display case, refrigeration system and thermostatic control method Ceased EP3500808A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201610670396.XA CN107752587A (en) 2016-08-16 2016-08-16 Refrigerated display case, refrigeration system and constant-temperature control method
PCT/US2017/045112 WO2018034846A1 (en) 2016-08-16 2017-08-02 Refrigeration display case, refrigeration system and thermostatic control method

Publications (1)

Publication Number Publication Date
EP3500808A1 true EP3500808A1 (en) 2019-06-26

Family

ID=59579963

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17751219.1A Ceased EP3500808A1 (en) 2016-08-16 2017-08-02 Refrigeration display case, refrigeration system and thermostatic control method

Country Status (3)

Country Link
EP (1) EP3500808A1 (en)
CN (1) CN107752587A (en)
WO (1) WO2018034846A1 (en)

Families Citing this family (2)

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

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3054564B2 (en) * 1994-11-29 2000-06-19 三洋電機株式会社 Air conditioner
US6311512B1 (en) * 2000-05-18 2001-11-06 Carrier Corporation Refrigerated merchandiser system
JP2002081817A (en) * 2000-09-06 2002-03-22 Fujitsu General Ltd Refrigerator
US6460372B1 (en) * 2001-05-04 2002-10-08 Carrier Corporation Evaporator for medium temperature refrigerated merchandiser
CN2534512Y (en) * 2002-04-15 2003-02-05 潘启川 Constant temperature and humidity air conditioner with lower-dew-point temperature controller
CN101413748A (en) * 2007-10-17 2009-04-22 开利公司 Complete machine show cabinet system
JP5045524B2 (en) * 2008-03-31 2012-10-10 ダイキン工業株式会社 Refrigeration equipment
EP2310773A4 (en) * 2008-06-30 2014-01-01 Carrier Corp Remote refrigeration display case system
CN102748830B (en) * 2011-04-19 2014-12-17 北汽福田汽车股份有限公司 Air-conditioning temperature control system and method
DE102012002593A1 (en) * 2012-02-13 2013-08-14 Eppendorf Ag Centrifuge with compressor cooling device and method for controlling a compressor cooling device of a centrifuge
JP6109205B2 (en) * 2013-01-31 2017-04-05 三菱電機株式会社 Refrigeration cycle apparatus and control method of refrigeration cycle apparatus
CN103245151B (en) * 2013-04-28 2015-02-25 南京师范大学 Frost-less air-source heat pump hot water unit and proportional-integral-differential control method for same
US9599353B2 (en) * 2013-07-26 2017-03-21 Whirlpool Corporation Split air conditioning system with a single outdoor unit
US9879893B2 (en) * 2014-01-21 2018-01-30 GD Midea Heating & Venting Equipment Co., Ltd. Air conditioning system, method for controlling air conditioning system, and outdoor apparatus of air conditioning system

Also Published As

Publication number Publication date
CN107752587A (en) 2018-03-06
WO2018034846A1 (en) 2018-02-22

Similar Documents

Publication Publication Date Title
US10712758B2 (en) Refrigerator and temperature measurement error correcting method of infrared sensor
US9989288B2 (en) System for managing lubricant levels in tandem compressor assemblies of an HVAC system
EP3640566A1 (en) Multi-split system and oil return control method and device of multi-split system
US11639802B2 (en) Control method and device of air conditioning system and air conditioning system
EP3460357A1 (en) Refrigerant circuit system and method for controlling refrigerant circuit system
US11668495B2 (en) Floating evaporator saturated suction temperature systems and methods
EP3500808A1 (en) Refrigeration display case, refrigeration system and thermostatic control method
CN105526762B (en) The temperature and coupling progress control method of the double refrigerating circuit refrigerators of double-compressor
CN109974392B (en) Control method and control device of refrigerator
CN109612021A (en) A kind of multi-gang air conditioner abnormal sound control method and multi-gang air conditioner
WO2006039066A2 (en) Charge management for 100% heat recovery units
US20210063044A1 (en) Method of judging lack-of-freon in air conditioner, and air conditioner control method
WO2019233069A1 (en) Defrosting control method and apparatus for air conditioner, and storage medium
WO2022161439A1 (en) Refrigeration equipment and control method and apparatus therefor, electronic device, and storage medium
CN109915992B (en) Method and device for returning liquid of anti-injection enthalpy pipeline of multi-split system
US20210215403A1 (en) Heat pump system, defrosting method for a heat pump system, and controller
RU2578055C2 (en) Single-circuit refrigerating apparatus
CN108603708B (en) Refrigeration device with valve
CN105190195A (en) Air conditioner
EP2390602A2 (en) A condenser coil unit for cooler devices
CN106196455B (en) Motor control method and system and air conditioner
US10982886B2 (en) Control method for a cooling device
CN112212473A (en) Refrigeration control method of fixed-frequency air conditioner under high-temperature working condition
US11340003B2 (en) Thermal monitoring for cooling systems
CN117433243B (en) Temperature control method and device for target compartment and electronic equipment

Legal Events

Date Code Title Description
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: UNKNOWN

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20190315

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

17Q First examination report despatched

Effective date: 20210614

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

REG Reference to a national code

Ref country code: DE

Ref legal event code: R003

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED

18R Application refused

Effective date: 20230602