A defrost control system for a refrigerator having freezer and fresh food compartments includes a plurality of temperature sensors, a plurality of door sensors to provide signals indicative of the occurrence of a door opening condition, a memory to store the signals in a plurality of usage blocks, a
A defrost control system for a refrigerator having freezer and fresh food compartments includes a plurality of temperature sensors, a plurality of door sensors to provide signals indicative of the occurrence of a door opening condition, a memory to store the signals in a plurality of usage blocks, and a CPU or controller to categorize the usage blocks into periods of high and low usage. When a defrost cycle is required, the control system establishes the cycle at an upcoming period designated as one of low usage. Additionally, prior to activating the system, the controller lowers the temperature of at least the freezer compartment to below a set point. The controller establishes the defrost cycle for a period based upon the time duration of previously completed cycles.
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A defrost control system for a refrigerator having freezer and fresh food compartments includes a plurality of temperature sensors, a plurality of door sensors to provide signals indicative of the occurrence of a door opening condition, a memory to store the signals in a plurality of usage blocks, a
A defrost control system for a refrigerator having freezer and fresh food compartments includes a plurality of temperature sensors, a plurality of door sensors to provide signals indicative of the occurrence of a door opening condition, a memory to store the signals in a plurality of usage blocks, and a CPU or controller to categorize the usage blocks into periods of high and low usage. When a defrost cycle is required, the control system establishes the cycle at an upcoming period designated as one of low usage. Additionally, prior to activating the system, the controller lowers the temperature of at least the freezer compartment to below a set point. The controller establishes the defrost cycle for a period based upon the time duration of previously completed cycles. ern and distribution through a pipeline to a market comprising: securing a transport ship to a mooring/docking facility, the ship carrying a cryogenic liquid; transferring the cryogenic liquid from the transport ship to a pumping system; pumping the cryogenic liquid through a conventional vaporizer system where the liquid changes to a warmed fluid that has been warmed to a temperature that is compatible with an uncompensated salt cavern, the vaporizer system being reinforced to withstand the pressures of the pumping system; transferring the warmed fluid into the uncompensated salt cavern; and discharging the warmed fluid from the uncompensated salt cavern through a pipeline to a market. 10. A liquefied natural gas (LNG) terminal comprising: a mooring/docking facility for at least one LNG ship; a low pressure pumping system with sufficient pressure to transfer the LNG from the LNG ship to a high pressure pumping system; the high pressure pumping system raising the pressure of the LNG to convert the LNG into dense phase natural gas (DPNG), the high pressure pumping system also providing sufficient pressure to move the DPNG through a Bishop Process heat exchanger and transfer the DPNG into an uncompensated salt cavern; the heat exchanger warming the DPNG to a temperature compatible with the uncompensated salt cavern, using a warmant selected from the group consisting of seawater, fresh water and warmants from industrial processes. 11. The terminal of claim 10 wherein the Bishop Process heat exchanger has at least one inner conduit formed from cryogenically compatible material and a outer conduit that is formed from material that is not cryogenically compatible, the inner conduit being of sufficient strength to contain the pressures of the DPNG from the high pressure pumping system.12. The terminal of claim 10 wherein the mooring/docking facility is selected from the group consisting of a dock, an offshore platform, a dolphin, a single point mooring/docking and a facility with multiple anchored mooring/docking lines.13. The terminal of claim 10 wherein the Bishop Process heat exchanger is selected from the group consisting of a single stage coaxial land mounted design, a single stage coaxial subsea mounted design, a multi-stage coaxial land mounted design, and a multi-stage coaxial subsea mounted design.14. A method for storing dense phase natural gas (DPNG) in an uncompensated salt cavern: securing a LNG ship to a mooring/docking facility; transferring the LNG from the LNG ship to a high pressure pumping system; pumping the LNG, at sufficient pressure to convert the LNG into DPNG, through a Bishop Process heat exchanger where the DPNG is warmed to a temperature that is compatible with an uncompensated salt cavern, a warmant being selected from the group consisting of seawater, fresh water and warmants from industrial processes; and transferring the warmed DPNG into the uncompensated salt cavern. 15. The method of claim 14 wherein the Bishop Process heat exchanger has at least one inner conduit formed from cryogenically compatible material and a outer conduit that is formed from material that is not cryogenically compatible, the inner conduit being of sufficient strength to contain the pressures of the DPNG from the high pressure pumping system.16. The method of claim 14 wherein the mooring/docking facility is selected from the group consisting of a dock, an offshore platform, a dolphin, a single point mooring/docking and multiple anchored mooring/docking lines.17. The method of claim 14 wherein the Bishop Process heat exchanger is selected from the group consisting of a single stage coaxial land mounted design, a single stage coaxial subsea mounted design, a multi-stage coaxial land mounted design, and a multi-stage coaxial subsea mounted design.18. A method for storing and discharging dense phase natural gas (DPNG) from an uncompensated salt cavern and distribution through a pipeline to a m
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이 특허에 인용된 특허 (4)
Lee Gihyeong,KRX ; Oh Chiseong,KRX, Defrost control method and apparatus of refrigerator.
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