EP0158581A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method and control system for protecting an evaporator in a refrigeration system against freezeups
Assignee: Carrier Corp
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Filing: 1985-04-04
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Granted: —
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Expires: 2005-04-04
Abstract
Abstract A method and control system are disclosed for operating a refrigeration system to protect an evaporator in a refrigeration system against freezeups of a heat transfer fluid cooled in the evaporator by operation of the refrigeration system. A first signal indicative of the temperature of the heat transfer fluid in the evaporator and a second signal indicative of the temperature of the heat transfer fluid leaving the evaporator are provided to a microcomputer system which processes the first and second signals to determine when the temperature of the heat transfer fluid in the evaporator falls below the temperature of the heat transfer fluid leaving the evaporator by a selected amount. The microcomputer system generates an alarm signal to shut down operation of the refrigeration system if the microcomputer system determines that the temperature of the heat transfer fluid in the evaporator is less than the temperature of the heat transfer fluid leaving the evaporator by the selected amount.
Inventors
- 👤 Richard Gary Lord
- 👤 Kenneth James Nieva
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 00:24
CPC Classifications
F; F25; F25D; F25D21/00; F25B; F25B47/00; F25B47/006; F25B49/00; F25B49/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
69 words
1 . A method of operating a refrigeration system having an evaporator for cooling a heat transfer fluid passed through the evaporator, comprising: determining the absolute temperature difference between the temperature of the heat transfer fluid in the evaporator and the temperature of the heat transfer fluid leaving the evaporator; and shutting down operation of the refrigeration system when the determined temperature difference is less than a preselected amount.
Claim 2
Dependent Claim
69 words
1 . A method of operating a refrigeration system having an evaporator for cooling a heat transfer fluid passed through the evaporator, comprising: determining the absolute temperature difference between the temperature of the heat transfer fluid in the evaporator and the temperature of the heat transfer fluid leaving the evaporator; and shutting down operation of the refrigeration system when the determined temperature difference is less than a preselected amount.
Claim 3
Independent Claim
108 words
A method of operating a refrigeration system having an evaporator for cooling a heat transfer fluid passed through the evaporator, comprising: sensing the temperature of the heat transfer fluid in the evaporator; sensing the temperature of the heat transfer fluid leaving the evaporator; comparing the sensed temperatures to determine when the absolute temperature difference between the temperature of the heat transfer fluid in the evaporator and the temperature of the heat transfer fluid leaving the evaporator is less than a selected amount; and shutting down operation of the refrigeration system when the determined temperature difference is less than the selected amount as determined by the step of comparing.
Claim 4
Independent Claim
108 words
A method of operating a refrigeration system having an evaporator for cooling a heat transfer fluid passed through the evaporator, comprising: sensing the temperature of the heat transfer fluid in the evaporator; sensing the temperature of the heat transfer fluid leaving the evaporator; comparing the sensed temperatures to determine when the absolute temperature difference between the temperature of the heat transfer fluid in the evaporator and the temperature of the heat transfer fluid leaving the evaporator is less than a selected amount; and shutting down operation of the refrigeration system when the determined temperature difference is less than the selected amount as determined by the step of comparing.
Claim 5
Dependent Claim
71 words
A control system for a refrigeration system having an evaporator for cooling a heat transfer fluid passed through the evaporator, comprising: means for determining the absolute temperature difference between the temperature of the heat transfer fluid in the evaporator and the temperature of the heat transfer fluid leaving the evaporator; and means for shutting down operation of the refrigeration system when the determined temperature difference is less than a preselected amount.
Claim 6
Dependent Claim
71 words
A control system for a refrigeration system having an evaporator for cooling a heat transfer fluid passed through the evaporator, comprising: means for determining the absolute temperature difference between the temperature of the heat transfer fluid in the evaporator and the temperature of the heat transfer fluid leaving the evaporator; and means for shutting down operation of the refrigeration system when the determined temperature difference is less than a preselected amount.
Claim 7
Dependent Claim
160 words
A control system for a refrigeration system having an evaporator for cooling a heat transfer fluid passed through the evaporator, comprising: first sensor means for sensing the temperature of the heat transfer fluid in the evaporator and for generating a first signal indicative of this sensed temperature; second sensor means for sensing the temperature of the heat transfer fluid leaving the evaporator and for providing a second signal indicative of this sensed temperature; processor means for receiving the first and second signals from the first sensor means and second sensor means, respectively, for processing the first and second signals to determine the absolute temperature difference between the heat transfer fluid in the evaporator and the heat transfer fluid leaving the evaporator, and for generating an alarm signal when the determined temperature difference is less than a preselected amount; and means for shutting down operation of the refrigeration system in response to generation of an alarm signal by the processor means.
Claim 8
Dependent Claim
160 words
A control system for a refrigeration system having an evaporator for cooling a heat transfer fluid passed through the evaporator, comprising: first sensor means for sensing the temperature of the heat transfer fluid in the evaporator and for generating a first signal indicative of this sensed temperature; second sensor means for sensing the temperature of the heat transfer fluid leaving the evaporator and for providing a second signal indicative of this sensed temperature; processor means for receiving the first and second signals from the first sensor means and second sensor means, respectively, for processing the first and second signals to determine the absolute temperature difference between the heat transfer fluid in the evaporator and the heat transfer fluid leaving the evaporator, and for generating an alarm signal when the determined temperature difference is less than a preselected amount; and means for shutting down operation of the refrigeration system in response to generation of an alarm signal by the processor means.
References Cited (Backward Citations)
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