Refrigeration – Processes – Employing diverse materials or particular material in...
Patent
1994-11-22
1996-09-24
Wayner, William E.
Refrigeration
Processes
Employing diverse materials or particular material in...
62218, F25B 4104, F25B 4300
Patent
active
055579370
ABSTRACT:
A vapour compression system, in which the pressure and flow rate of refrigerant in components of the system to control and to optimise use of heat-transfer surfaces and to minimise power consumption, comprises a compressor 1, a condenser 5, a two-section evaporator 15, and a needle float valve 13 for maintaining a pressure differential between the condenser and the evaporator. The two section evaporator comprises a first section 17 which receives refrigerant from the condenser and which partially evaporates it to discharge two-phase refrigerant into a reservoir 23 in which liquid refrigerant is collected and from which low pressure refrigerant vapour is supplied to the compressor, and a second section 19 which receives liquid refrigerant from the reservoir and evaporates it at least partially. The needle float valve may be include a tapered needle, having two tapered portions which fit into respective orifices, flow of fluid through the orifices being in opposite directions, so that the force required to open the valve or to maintain it in a partly open position is independent of the pressure drop across it.
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The University of Leeds
Wayner William E.
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