Refrigeration systems using high pressure receivers

Claim 1

A REFRIGERATION SYSTEM COMPRISING A REFRIGERANT COMPRESSOR, A CONDENSER, A RECEIVER, A HEAT EXCHANGE COIL, AN EXPANSION VALVE, AN EVAPORATOR, AND A SUCTION LINE ACCUMULATOR CONNECTED IN THE ORDER NAMED IN A REFRIGERATION CIRCUIT, SAID HEAT EXCHANGE COIL BEING ARRANGED TO HEAT LIQUID WITHIN SAID ACCUMULATOR, AND MEANS INCLUDING MEANS RESPONSIVE TO CHANGES IN THE LEVEL OF REFRIGERANT LIQUID WITHIN SAID RECEIVER CONNECTED TO SAID EXPANSION VALVE FOR ADJUSTING SAID EXPANSION VALVE TOWARDS OPEN POSITION ON AN INCREASE IN LIQUID LEVEL, AND TOWARDS CLOSED POSITION ON A DECREASE IN LIQUID LEVEL, SAID SYSTEM BEING OVERCHARGED WITH REFRIGERANT SO THAT THERE IS ALWAYS A QUANTITY OF REFRIGERANT LIQUID WITHIN SAID ACCUMULATOR, SAID EXPANSION VALVE OVERFEEDING SAID EVAPORATOR SO THAT UNEVAPORATED LIQUID FLOWS FROM THE LATTER INTO SAID ACCUMULATOR, SAID HEAT EXCHANGE COIL BEING ARRANGED TO EVAPORATE REFRIGERANT LIQUID WITHIN SAID ACCUMULATOR AT SUBSTANTIALLY THE SAME RATE AT WHICH UNEVAPORATED REFRIGERANT LIQUID FLOWS FROM SAID EVAPORATOR INTO SAID ACCUMULATOR.