Patent US2231512A successfully refreshed from Google Patents.
EP0027604A2
Expired / Lapsed
EP
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Refrigeration system having two refrigeration circuits
Assignee: Carrier Corp
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Filing: 1980-10-09
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Granted: —
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Expires: 2000-10-09
Abstract
Abstract Apparatus and method for defrosting a dual refrigeration circuit refrigeration system. During defrost one of the refrigeration circuits is operated to supply heat energy to the frosted heat exchanger of the other circuit and the fan circulating heat transfer media through a heat exchanger of each circuit is reversed such that heat transfer fluid is heated by one refrigeration circuit and then used to defrost a heat exchanger of the other circuit.
Inventors
- 👤 Richmond S. Hayes Jr.
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 14:36
CPC Classifications
F; F25; F25B; F25B47/00; F25B47/02; F25B47/022; F25B13/00; F25B29/00; F25B29/003; F25B2313/00; F25B2313/025; F25B2313/0251; F25B2400/00; F25B2400/06; F25B2400/061; F25B2700/00; F25B2700/11
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
163 words
A refrigeration system having two refrigeration circuits which is characterized by a first refrigeration circuit having a first compressor (19), a first heat exchanger (42), a second heat exchanger (30) and means (21) for supplying relatively hot refrigerant to the first heat exchanger; a second refrigeration circuit having a second compressor (20), a third heat exchanger (40), and a fourth heat exchanger (30), said third heat exchanger being located adjacent the first heat exchanger; fan means (44) for circulating a heat transfer fluid in heat transfer relation with both the first heat exchanger and the third heat exchanger; defrost means (41) for generating a defrost signal for defrost of the third heat exchanger; and control means for activating the means for supplying relatively hot refrigerant to the first heat exchanger and for operating the fan means in response to the defrost signal whereby heat energy is transferred from the first heat exchanger to the third heat exchanger to melt the frost formed thereon.
Claim 2
Dependent Claim
163 words
A refrigeration system having two refrigeration circuits which is characterized by a first refrigeration circuit having a first compressor (19), a first heat exchanger (42), a second heat exchanger (30) and means (21) for supplying relatively hot refrigerant to the first heat exchanger; a second refrigeration circuit having a second compressor (20), a third heat exchanger (40), and a fourth heat exchanger (30), said third heat exchanger being located adjacent the first heat exchanger; fan means (44) for circulating a heat transfer fluid in heat transfer relation with both the first heat exchanger and the third heat exchanger; defrost means (41) for generating a defrost signal for defrost of the third heat exchanger; and control means for activating the means for supplying relatively hot refrigerant to the first heat exchanger and for operating the fan means in response to the defrost signal whereby heat energy is transferred from the first heat exchanger to the third heat exchanger to melt the frost formed thereon.
Claim 3
Dependent Claim
36 words
The apparatus as set forth in claim 1 and further characterized by the fan means including means for reversing the flow direction of the heat transfer medium in response to a signal from the control means.
Claim 4
Dependent Claim
35 words
The apparatus as set forth in claim 1 and further characterized by the first heat exchanger being located adjacent the third heat exchanger such that the heat transfer fluid flows serially through both heat exchangers.
Claim 5
Dependent Claim
97 words
The apparatus as set forth in claim 1 and further characterized by the third heat exchanger (40) being generally cylindrical in configuration, the first heat exchanger (42) being generally cylindrical in configuration and fitting within the third heat exchanger and wherein during non-defrost operation heat transfer fluid flows first through the third heat exchanger and next through the first heat exchanger and upon a defrost signal being detected by the control means the fan means is reversed such that the heat transfer fluid flows first through the first heat exchanger and then through the third heat exchanger.
Claim 6
Dependent Claim
60 words
The apparatus as set forth in claim 1 which is further characterized by the capacity of the first refrigeration circuit being sized in comparison to the second refrigeration circuit such that the first circuit may supply sufficient heat energy to defrost the third heat exchanger while the second refrigeration circuit continues to supply heat energy to the fourth heat exchanger.
Claim 7
Dependent Claim
175 words
A heat pump system having two separate vapor compression refrigeration systems which is characterized by a first compressor (19), a second compressor (20), reversing means connected to the first compressor (21), an indoor heat exchanger (30) connected to both compressors, a first outdoor heat exchanger (42) connected to the first compressor, a second outdoor heat exchanger (40) connected to the second compressor and located adjacent the first outdoor heat exchanger, reversible fan means (44) for circulating air in heat exchange relation with the first and second outdoor heat exchangers, defrost means (41) for generating a defrost signal for defrost of the second outdoor heat exchanger and control means responsive to the defrost means for reversing the fan means and for switching the reversing means such that heat energy is supplied to the first outdoor coil and air is circulated over the first outdoor heat exchanger absorbing heat energy therefrom, said air being conducted to the second outdoor heat exchanger where a portion of the heat energy is rejected to defrost said second outdoor heat exchanger.
Claim 8
Dependent Claim
175 words
A heat pump system having two separate vapor compression refrigeration systems which is characterized by a first compressor (19), a second compressor (20), reversing means connected to the first compressor (21), an indoor heat exchanger (30) connected to both compressors, a first outdoor heat exchanger (42) connected to the first compressor, a second outdoor heat exchanger (40) connected to the second compressor and located adjacent the first outdoor heat exchanger, reversible fan means (44) for circulating air in heat exchange relation with the first and second outdoor heat exchangers, defrost means (41) for generating a defrost signal for defrost of the second outdoor heat exchanger and control means responsive to the defrost means for reversing the fan means and for switching the reversing means such that heat energy is supplied to the first outdoor coil and air is circulated over the first outdoor heat exchanger absorbing heat energy therefrom, said air being conducted to the second outdoor heat exchanger where a portion of the heat energy is rejected to defrost said second outdoor heat exchanger.
Claim 9
Dependent Claim
82 words
The apparatus as set forth in claim 6 which is further characterized by the first and second outdoor heat exchangers being both cylindrical in configuration and the first outdoor heat exchanger having a smaller diameter than the second outdoor heat exchanger is located within the second outdoor heat exchanger and the fan means either circulates air through the second outdoor heat exchanger and then the first outdoor heat exchanger or the first outdoor heat exchanger and then the second outdoor heat exchanger.
Claim 10
Independent Claim
198 words
A method of controlling a refrigeration system having multiple refrigeration circuits including a first heat exchanger (40, 42) for each circuit and a reversible fan (44) for circulating air through the first heat exchangers, a compressor (19, 20) for each circuit, a second heat exchanger (30) for each circuit which is characterized by the steps of selectively energizing the compressors to transfer heat energy between the first heat exchanger and the second heat exchanger of each circuit, energizing the fan to circulate a heat transfer medium in heat exchange relation with the first heat exchangers, generating a defrost signal for commencing defrost of at least one first heat exchanger, conducting relatively hot refrigerant to at least one of the first heat exchangers upon the generation of a defrost signal, and modifying the step of energizing the fan such that the heat transfer medium flows in heat exchange relation with the first heat exchanger rejecting heat, absorbs a portion of said heat energy and then flows into heat exchange relation with the first heat exchanger to be defrosted, the heat transfer medium rejecting heat energy to the first heat exchanger to be defrosted to melt the frost accumulated thereon.
Claim 11
Independent Claim
198 words
A method of controlling a refrigeration system having multiple refrigeration circuits including a first heat exchanger (40, 42) for each circuit and a reversible fan (44) for circulating air through the first heat exchangers, a compressor (19, 20) for each circuit, a second heat exchanger (30) for each circuit which is characterized by the steps of selectively energizing the compressors to transfer heat energy between the first heat exchanger and the second heat exchanger of each circuit, energizing the fan to circulate a heat transfer medium in heat exchange relation with the first heat exchangers, generating a defrost signal for commencing defrost of at least one first heat exchanger, conducting relatively hot refrigerant to at least one of the first heat exchangers upon the generation of a defrost signal, and modifying the step of energizing the fan such that the heat transfer medium flows in heat exchange relation with the first heat exchanger rejecting heat, absorbs a portion of said heat energy and then flows into heat exchange relation with the first heat exchanger to be defrosted, the heat transfer medium rejecting heat energy to the first heat exchanger to be defrosted to melt the frost accumulated thereon.
Claim 12
Dependent Claim
72 words
The method as set forth in claim 8 wherein the second heat exchangers of each circuit are in heat exchange relation with each other and wherein the step of modifying is further characterized by transferring heat energy from the second heat exchanger of the refrigeration circuit having the first heat exchanger which is to be defrosted to the second heat exchanger of the refrigeration circuit rejecting heat at the first heat exchanger.
References Cited (Backward Citations)
No citation records indexed.
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