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US 6,076,360 AGranted
Control method for a cryogenic unit
AssigneeThermo King Corporation
InventorsHerman H. Viegas, Bradley G. Ellingson, Mark J. Buenz
Life of this patent
Estimating the term…
Abstract
Apparatus and methods for improving efficiency of a temperature conditioning system which employs a cryogenic liquid. A vapor powered ventilation motor is normally powered by vapor from the low pressure end of the evaporation coils. However, supplemental vapor is provided at start-up to provide immediate ventilation. In addition, vapor which bleeds off valves is cycled through the vapor powered motor or used to maintain a slight positive pressure when the system is shut down.
Claims4
A temperature conditioning system comprising:
- a supply vessel containing cryogenic vapor and cryogenic liquid, the cryogenic vapor having a cryogenic vapor pressure, the temperature conditioning system utilizing cryogenic liquid evaporation within an evaporation coil, the evaporation coil being ventilated by a vapor powered blower having a vapor inlet connected to receive vapor from said evaporation coil, the system comprising means interconnecting said cryogenic fluid supply and said blower vapor inlet for providing vapor to power said blower independently of said evaporation coil, the system further comprising an excess vapor line flow connecting the interior of the supply vessel to the temperature control system, the excess vapor line including a flow control valve which opens when the cryogenic vapor pressure exceeds a predetermined acceptable value to thereby permit the stored cryogenic vapor to be supplied to the system to thereby reduce the cryogenic vapor pressure to an acceptable pressure value and maintain the system at a positive pressure when the temperature conditioning system is turned off.
Dependencies are inferred from the claim text.