CN103822396B - Heat exchanger runs accessory system and uses the heat exchanger system of this system - Google Patents
Heat exchanger runs accessory system and uses the heat exchanger system of this system Download PDFInfo
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- CN103822396B CN103822396B CN201410045643.8A CN201410045643A CN103822396B CN 103822396 B CN103822396 B CN 103822396B CN 201410045643 A CN201410045643 A CN 201410045643A CN 103822396 B CN103822396 B CN 103822396B
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- heat exchanger
- condenser
- refrigeration system
- cold
- evaporator
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
Abstract
The present invention relates to the heat exchanger system that heat exchanger runs accessory system and uses this system.Wherein heat exchanger system comprises evaporimeter, condenser and heat exchanger operation accessory system, heat exchanger runs accessory system and comprises Solid Adsorption Refrigeration System, described Solid Adsorption Refrigeration System is provided with refrigerant system condenser and refrigeration system evaporator, and described heat exchanger runs accessory system and also comprises the heat transfer apparatus for being carried to the evaporimeter of corresponding heat exchanger system by the high-temperature medium around refrigerant system condenser and/or be used for the cold conveying device that the cryogenic media around by refrigeration system evaporator carries to the condenser of corresponding heat exchanger system.Adopt above-mentioned heat exchanger operation accessory system can improve the heat exchange property of heat exchanger, structure is simple, and can make full use of solar energy, energy-conserving and environment-protective.
Description
Technical field
The present invention relates to the heat exchanger system that heat exchanger runs accessory system and uses this system.
Background technology
In use, when evaporimeter side temperature is lower, the easy frosting of heat-transfer surface of evaporimeter, thus can reduce the circulation area of air-flow, intercepts air circulation, heat exchange amount is declined the heat exchanger system with evaporimeter and condenser; Meanwhile, itself there is thermal conduction resistance in frost layer, can worsen heat transfer, makes that refrigeration performance is deteriorated, Energy Efficiency Ratio reduces rapidly, and heat exchanger system even can be caused time serious to work.Present heat exchanger system, such as air-conditioning, for preventing frosting on the impact of refrigeration performance, the normal electric heated defrosting method that adopts defrosts to evaporimeter, needs to waste more electric energy.In addition, existing Defrost method is all generally that frosting occurs just to start defrosting relatively seriously, and defrost process needs a period relatively grown, and the during this period of time normal work of air-conditioning can be affected, and comfortableness is poor.
And in the condenser working process of air-conditioning, need outwardly environment to release heat, existing domestic air conditioning condenser generally adopts air cooling way to cool, the finned tube of blower fan to condenser is utilized to dispel the heat, but, due to summer, the environment temperature of outdoor is higher, and in China's most area especially south, samming is all more than 30 degrees Celsius round the clock, and therefore the radiating effect of condenser is not very good, cause the poor cooling performance of air-conditioning, also result in waste of energy.
Summary of the invention
The object of this invention is to provide a kind of heat exchanger improving heat exchanger heat exchange property and run accessory system, meanwhile, present invention also offers a kind of heat exchanger system using this system.
The technical scheme that in the present invention, heat exchanger operation accessory system adopts is: heat exchanger runs accessory system, comprise Solid Adsorption Refrigeration System, described Solid Adsorption Refrigeration System is provided with refrigerant system condenser and refrigeration system evaporator, and described heat exchanger runs accessory system and also comprises the heat transfer apparatus for being carried to the evaporimeter of corresponding heat exchanger system by the high-temperature medium around refrigerant system condenser and/or be used for the cold conveying device that the cryogenic media around by refrigeration system evaporator carries to the condenser of corresponding heat exchanger system.
Described heat transfer apparatus and cold conveying device comprise corresponding conveyance conduit, conveyance conduit for forming heat transfer apparatus has the input corresponding to refrigerant system condenser and for the output corresponding with the evaporimeter of corresponding heat exchanger system, and the conveyance conduit for forming cold conveying device has the input corresponding to refrigeration system evaporator and for the output corresponding with the condenser of corresponding heat exchanger system; Described heat exchanger operation accessory system also comprises the air-stream generating device for refrigerant system condenser or refrigeration system evaporator ambient air medium being carried to output by corresponding conveyance conduit.
The outer peripheral of described refrigerant system condenser and/or refrigeration system evaporator is provided with seal box, and the input of corresponding conveyance conduit is communicated with the cavity of described seal box.
Described seal box is provided with for the headstock gear communicated with ambient atmosphere by the cavity of casing or isolate.
Described refrigerant system condenser and refrigeration system evaporator outside are equipped with seal box, described conveyance conduit comprises defeated heat pipe that the seal box corresponding with refrigerant system condenser be communicated with and the defeated cold pipe that the seal box corresponding with refrigeration system evaporator is communicated with, described defeated heat pipe is arranged in parallel with defeated cold pipe and both are connected with a cold and hot carrier pipe away from one end of Solid Adsorption Refrigeration System, described defeated heat pipe and the valve defeated cold pipe is equipped with for being communicated with or disconnecting with described cold and hot carrier pipe.
Described valve is the triple valve for being optionally communicated with cold and hot carrier pipe by the cavity of corresponding seal box or being communicated with ambient atmosphere.
Described cold and hot carrier pipe is provided with the arm of supplying gas of more than two away from one end of Solid Adsorption Refrigeration System, described in supply gas in the middle part of fin that arm has for the evaporimeter with heat exchanger system with the gas outlet that upper/lower positions is corresponding.
The technical scheme that in the present invention, heat exchanger system adopts is: heat exchanger system, comprise evaporimeter and condenser, also comprise heat exchanger and run accessory system, described heat exchanger runs accessory system and comprises Solid Adsorption Refrigeration System, described Solid Adsorption Refrigeration System is provided with refrigerant system condenser and refrigeration system evaporator, described heat exchanger runs accessory system and also comprises the heat transfer apparatus for being carried to the evaporimeter of heat exchanger system by the high-temperature medium around refrigerant system condenser and/or be used for the cold conveying device that the cryogenic media around by refrigeration system evaporator carries to the condenser of heat exchanger system.
Described heat transfer apparatus and cold conveying device comprise corresponding conveyance conduit, conveyance conduit for forming heat transfer apparatus has the input corresponding with refrigerant system condenser and the output corresponding with the evaporimeter of heat exchanger system, and the conveyance conduit for forming cold conveying device has the input corresponding with refrigeration system evaporator and the output corresponding with the condenser of heat exchanger system; Described heat exchanger operation accessory system also comprises the air-stream generating device for refrigerant system condenser or refrigeration system evaporator ambient air medium being carried to output by corresponding conveyance conduit.
The outer peripheral of described refrigerant system condenser and/or refrigeration system evaporator is provided with seal box, and the input of corresponding conveyance conduit is communicated with the cavity of described seal box.
The present invention adopts technique scheme, heat exchanger runs accessory system and comprises the Solid Adsorption Refrigeration System being provided with refrigerant system condenser and refrigeration system evaporator, refrigerant system condenser can operationally distribute heat, refrigeration system evaporator can operationally be freezed, the evaporimeter of high-temperature medium around refrigerant system condenser to corresponding heat exchanger system can be carried by corresponding heat transfer apparatus, realize the defrosting of the evaporimeter of heat exchanger system, improve heat exchange property; And the condenser of the cryogenic media around refrigeration system evaporator to corresponding heat exchanger system can be carried by cold conveying device, improve the condensation effect of the condenser of heat exchanger system, heat exchange property can be improved equally, and Solid Adsorption Refrigeration System utilizes solar energy work, therefore there is good energy-saving effect.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the embodiment one of heat exchanger system in the present invention, is also the schematic diagram that in the present invention, heat exchanger runs the embodiment one of accessory system simultaneously;
Fig. 2 is the schematic diagram of the embodiment two of heat exchanger system in the present invention, is also the schematic diagram that in the present invention, heat exchanger runs the embodiment two of accessory system simultaneously.
Detailed description of the invention
In the present invention, the embodiment one of heat exchanger system as shown in Figure 1, comprises heat exchanger 11 and heat exchanger and run accessory system 12, and heat exchanger 11 comprises heat exchanger tube 111 and the heat exchanger fin 112 for the heat exchange efficiency that strengthens heat exchanger tube 111; Heat exchanger runs accessory system 12 and comprises Solid Adsorption Refrigeration System and corresponding heat transfer apparatus, cold conveying device, heat transfer apparatus is used for the high-temperature medium run by heat exchanger around the refrigerant system condenser 124 of accessory system 12 and carries to the evaporimeter of heat exchanger system, and cold conveying device is used for the cryogenic media run by heat exchanger around the refrigeration system evaporator 125 of accessory system 12 and carries to the condenser of heat exchanger system.
Solid Adsorption Refrigeration System is prior art, take heat energy as the energy conversion system driven, Solid Adsorption Refrigeration System in the present embodiment comprises adsorbent seal box 121, be arranged in adsorbent seal box 121 by zeolite---the absorption that water is formed to, condenser side check valve 122, vaporizer side check valve 123, refrigerant system condenser 124 and refrigeration system evaporator 125, refrigerant system condenser 124 and refrigeration system evaporator 125 all adopt fin configuration.On daytime, adsorb the irradiation to being subject to the sun, the zeolite as adsorbent is heated, water is vaporized into water vapour and starting desorption from zeolite as working medium about 40 degrees Celsius time, and in system, pressure starts to rise.When reaching certain pressure (7373Pa, namely corresponding with 40 degrees Celsius saturation pressure), steam just starts liquefaction, and refrigerant system condenser 124 releases heat, and the water condensed flows into refrigeration system evaporator 125.At night, zeolite is cooled to close to environment temperature, is provided with the ability absorbing steam, thus makes the water in refrigeration system evaporator 125 constantly vaporize, and absorbs the heat of cooled medium.Suction the zeolite of steam, for the desorption cycle on daytime creates condition, circulation has been continued.Because Solid Adsorption Refrigeration System is prior art, its concrete structure and principle no longer describe in detail herein.Wherein, the outside of refrigerant system condenser 124 and refrigeration system evaporator 125 is arranged with condenser seal box 126 and evaporimeter seal box 127 respectively.
Heat transfer apparatus and cold conveying device include corresponding conveyance conduit, conveyance conduit for forming heat transfer apparatus has the input corresponding with refrigerant system condenser 124 and the output corresponding with heat exchanger, and in the present embodiment, this input is be communicated with the defeated heat pipe 128 on the seal box outside refrigerant system condenser 124; Conveyance conduit for forming cold conveying device has the input corresponding with refrigeration system evaporator 125 and the output corresponding with heat exchanger, and in the present embodiment, this input is be communicated with the defeated cold pipe 129 on the seal box outside refrigeration system evaporator 125.Described defeated heat pipe 128 is arranged in parallel with defeated cold pipe 129 and both are connected with a cold and hot carrier pipe 1211 away from one end of Solid Adsorption Refrigeration System, makes the conveyance conduit corresponding with heat transfer apparatus and the public pipeline of the conveyance conduit corresponding with cold conveying device.Defeated heat pipe 128 and the stop valve 1281 defeated cold pipe 129 is respectively equipped with for being communicated with described cold and hot carrier pipe 1211 or disconnect and stop valve 1291, control the medium carried to heat exchanger 11 by the state controlling stop valve.Cold and hot carrier pipe 1211 is provided with three arms 1212 of supplying gas away from one end of Solid Adsorption Refrigeration System, respectively the supply gas position of gas outlet all with following in the middle part of heat exchanger fin 112 of arm 1212 is corresponding, can the frosting of heat exchanger fin 112 is serious when defrosting region preferentially heat.Further, according to actual conditions, the different in size of arm 1212 of supplying gas, to meet different parts defrosting demand on fin.Certainly, in other embodiments, the quantity of arm 1212 of supplying gas and setting position also can change according to actual needs.
A wherein side box wall of two seal boxs is respectively equipped with case lid 1261 and case lid 1271, can moves by pull, upwards open during pull, close during downward pull, thus be configured for the headstock gear that communicated with ambient atmosphere by the cavity of casing or isolate.Be respectively equipped with a blower fan 1262 and blower fan 1272 in two seal boxs, be configured for air-stream generating device refrigerant system condenser 124 or refrigeration system evaporator 125 ambient air medium carried to output by corresponding conveyance conduit.The case lid of each seal box needs arrange some apertures, to prevent air in corresponding seal box to be output rear formation negative pressure, hole diameter can not be too large, to prevent from carrying out more exchange heat with external environment in corresponding seal box.Certainly, in other embodiments, aperture also can be arranged on other positions of casing, such as, be provided with on the casing of blower fan; Further, aperture also can replace to breather line.For reducing energy loss, each seal box utilizes heat-barrier material to make; In addition, seal box has certain water-proof function, to adapt to environment for use.
The use of evaporator defrost function: daytime in winter, heat exchanger 11 is used as the off-premises station of air-conditioning, and air-conditioning heats indoor, and off-premises station uses as needing the evaporimeter of regularly defrosting.Absorption in Solid Adsorption Refrigeration System is to dependence solar energy heating, and in system, pressure raises gradually, and vaporizer side check valve 123 is closed.As long as the pressure in adsorbent seal box 121 is lower than the pressure in refrigerant system condenser 124, condenser side check valve 122 is closed condition.When pressure reaches with saturated vapour pressure corresponding to environment temperature, condenser side check valve 122 is opened, water vapour liquefies and releases heat in refrigerant system condenser 124, and enter refrigeration system evaporator 125, now the case lid 1261 of condenser seal box 126 closes, blower fan is opened, stop valve 1281 on defeated heat pipe 128 is opened, stop valve 1291 on defeated cold pipe 129 is closed, the air absorbing the heat that refrigerant system condenser 124 sends in condenser seal box 126 is blown to the frosting district of heat exchanger fin 112 by the effect of blower fan uniformly by hot carrier pipe, play defrosting effect.Because Solid Adsorption Refrigeration System can only absorb solar energy by day, therefore during for defrost function, only have daytime effective.But relative to electric heated defrosting, still there is obvious power savings advantages.When not needing to use defrost function, closing the stop valve 1281 on defeated heat pipe 128, opening the case lid 1261 of condenser seal box 126, making refrigerant system condenser 124 be in nature heat release state.
The use of condenser refrigerating function: summer evenings, heat exchanger 11 is used as the off-premises station of air-conditioning, and air-conditioning is to indoor refrigeration, and off-premises station uses as condenser.Zeolite can not get shining upon and cooling gradually at night, vaporizer side check valve 123 is opened, condenser side check valve 122 is closed, the adsorption capacity of zeolite progressively improves again, start the refrigerant vapor of generation in absorbing refrigeration system evaporimeter 125 and make system be low-pressure state, water is under low pressure constantly vaporized, and absorbs the heat of evaporimeter seal box 127.The stop valve 1281 of defeated heat pipe 128 side is closed, the stop valve 1291 of defeated cold pipe 129 side is opened, blower fan 1272 in evaporimeter seal box 127 is opened, in evaporimeter seal box 127, cooled air is delivered to by defeated Leng Guan 129 road the finned tube place needing cooling uniformly, reaches the effect of effective cooling condenser.The shortcoming of this device is that condenser refrigerating function only has and could use after the sunset.But because this device can use every day, therefore Long-Time Service advantage is still fairly obvious.When not needing to use this function, closing defeated cold pipe 129 stop valve, opening the case lid 1271 of evaporimeter seal box 127.
In the present invention, the embodiment two of heat exchanger system as shown in Figure 2, with embodiment one unlike, in the present embodiment condenser seal box 226 and evaporimeter seal box 227 casing on case lid is not set, and the valve on defeated heat pipe 228 and defeated cold pipe 229 is respectively triple valve 2281 and triple valve 2291, can optionally the cavity of corresponding seal box is communicated with cold and hot carrier pipe 2211 or is communicated with ambient atmosphere.Fan 2262 and the fan 2272 of corresponding defeated heat pipe 228 and defeated cold pipe 229 is respectively equipped with in two seal boxs, like this, when needing to use evaporator defrost function, control the triple valve 2281 on defeated heat pipe 228, condenser seal box 226 is communicated with cold and hot carrier pipe 2211; Control the triple valve 2291 on defeated cold pipe 229, evaporimeter seal box 227 is communicated with air, heat exchanging system evaporator can play defrosting effect equally.When needing to use cooler refrigerating function, control the triple valve 2291 on defeated cold pipe 229, evaporimeter seal box 227 is communicated with cold and hot carrier pipe 2211; Control the triple valve 2281 on defeated heat pipe 228, condenser seal box 226 is communicated with air, cooling effect can be played by heat exchanging system condenser equally.In addition, in the present embodiment, refrigerant system condenser and refrigeration system evaporator all adopt coil form, change efficiency to improve heat exchange.It is pointed out that in other embodiments, the concrete heat exchange form of refrigerant system condenser and refrigeration system evaporator is not limited to the fin configuration in embodiment one and the coil form in the present embodiment, can adopt arbitrary form of the prior art.
In the present invention, heat exchanger runs the heat exchanger that the embodiment one of accessory system and embodiment two be respectively in above-mentioned heat exchanger system embodiment one and embodiment two and runs accessory system, and concrete structure repeats no more herein.
In the above-described embodiments, heat exchanger runs accessory system and is provided with heat transfer apparatus and cold conveying device simultaneously, can carry out the switching of evaporator defrost function and condenser refrigerating function easily, and heat transfer apparatus and cold conveying device have employed corresponding seal box and conveyance conduit.In other embodiments of the invention, heat exchanger runs accessory system and only can arrange heat transfer apparatus or only arrange cold conveying device, and corresponding heat transfer apparatus and cold conveying device also can adopt other forms to replace, such as seal box is not set, conveyance conduit and blower fan are set respectively at respective refrigeration systems condenser or refrigeration system evaporator both sides, directly utilize blower fan will to carry out hot air medium and cold air medium; Certainly, blower fan can be arranged on other positions of conveyance conduit, and blower fan also can adopt the form of exhausting.In addition, in other embodiments, liquid medium also can be utilized to carry out the conveying of energy.Moreover in other embodiments, hot conveyance conduit and cold conveying pipe also can arrange separately and be separated from each other.
Claims (6)
1. heat exchanger runs accessory system, it is characterized in that: comprise Solid Adsorption Refrigeration System, described Solid Adsorption Refrigeration System is provided with refrigerant system condenser and refrigeration system evaporator, and described heat exchanger runs accessory system and also comprises the heat transfer apparatus for being carried to the evaporimeter of corresponding heat exchanger system by the high-temperature medium around refrigerant system condenser and/or be used for the cold conveying device that the cryogenic media around by refrigeration system evaporator carries to the condenser of corresponding heat exchanger system; Described heat transfer apparatus and cold conveying device comprise corresponding conveyance conduit, conveyance conduit for forming heat transfer apparatus has the input corresponding to refrigerant system condenser and for the output corresponding with the evaporimeter of corresponding heat exchanger system, and the conveyance conduit for forming cold conveying device has the input corresponding to refrigeration system evaporator and for the output corresponding with the condenser of corresponding heat exchanger system; Described heat exchanger operation accessory system also comprises the air-stream generating device for refrigerant system condenser or refrigeration system evaporator ambient air medium being carried to output by corresponding conveyance conduit, and described air-stream generating device is blower fan; The outer peripheral of described refrigerant system condenser and/or refrigeration system evaporator is provided with seal box, and the input of corresponding conveyance conduit is communicated with the cavity of described seal box.
2. heat exchanger according to claim 1 runs accessory system, it is characterized in that: described seal box is provided with for the headstock gear communicated with ambient atmosphere by the cavity of casing or isolate.
3. heat exchanger according to claim 1 and 2 runs accessory system, it is characterized in that: described refrigerant system condenser and refrigeration system evaporator outside are equipped with seal box, described conveyance conduit comprises defeated heat pipe that the seal box corresponding with refrigerant system condenser be communicated with and the defeated cold pipe that the seal box corresponding with refrigeration system evaporator is communicated with, described defeated heat pipe is arranged in parallel with defeated cold pipe and both are connected with a cold and hot carrier pipe away from one end of Solid Adsorption Refrigeration System, described defeated heat pipe and the valve defeated cold pipe is equipped with for being communicated with or disconnecting with described cold and hot carrier pipe.
4. heat exchanger according to claim 3 runs accessory system, it is characterized in that: described valve is the triple valve for being optionally communicated with cold and hot carrier pipe by the cavity of corresponding seal box or being communicated with ambient atmosphere.
5. heat exchanger according to claim 3 runs accessory system, it is characterized in that: described cold and hot carrier pipe is provided with the arm of supplying gas of more than two away from one end of Solid Adsorption Refrigeration System, described in supply gas in the middle part of fin that arm has for the evaporimeter with heat exchanger system with the gas outlet that upper/lower positions is corresponding.
6. heat exchanger system, comprise evaporimeter and condenser, it is characterized in that: also comprise heat exchanger and run accessory system, described heat exchanger runs accessory system and comprises Solid Adsorption Refrigeration System, described Solid Adsorption Refrigeration System is provided with refrigerant system condenser and refrigeration system evaporator, described heat exchanger runs accessory system and also comprises the heat transfer apparatus for being carried to the evaporimeter of heat exchanger system by the high-temperature medium around refrigerant system condenser and/or be used for the cold conveying device that the cryogenic media around by refrigeration system evaporator carries to the condenser of heat exchanger system, described heat transfer apparatus and cold conveying device comprise corresponding conveyance conduit, conveyance conduit for forming heat transfer apparatus has the input corresponding with refrigerant system condenser and the output corresponding with the evaporimeter of heat exchanger system, and the conveyance conduit for forming cold conveying device has the input corresponding with refrigeration system evaporator and the output corresponding with the condenser of heat exchanger system, described heat exchanger operation accessory system also comprises the air-stream generating device for refrigerant system condenser or refrigeration system evaporator ambient air medium being carried to output by corresponding conveyance conduit, and described air-stream generating device is blower fan, the outer peripheral of described refrigerant system condenser and/or refrigeration system evaporator is provided with seal box, and the input of corresponding conveyance conduit is communicated with the cavity of described seal box.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410045643.8A CN103822396B (en) | 2014-02-08 | 2014-02-08 | Heat exchanger runs accessory system and uses the heat exchanger system of this system |
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| CN201410045643.8A CN103822396B (en) | 2014-02-08 | 2014-02-08 | Heat exchanger runs accessory system and uses the heat exchanger system of this system |
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| CN103822396A CN103822396A (en) | 2014-05-28 |
| CN103822396B true CN103822396B (en) | 2016-03-09 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106989632B (en) * | 2017-03-14 | 2019-04-12 | 南京酷朗电子有限公司 | Finned heat exchanger system and method with auxiliary tube |
| CN108571914B (en) * | 2017-03-14 | 2019-11-22 | 南京酷朗电子有限公司 | Finned heat exchanger system and method with cleaning function |
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| CA2436367A1 (en) * | 2003-05-09 | 2004-11-09 | Serge Dube | Energy storage with refrigeration systems and method |
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| JPH1114183A (en) * | 1997-06-18 | 1999-01-22 | Denso Corp | Freezer device |
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