REFRIGERATION SYSTEM

摘要

A multistage refrigeration system having defrost circuit where a second refrigerant is drawn from an intermediate point of a condenser of a second stage system, directed through a heat exchanger to exchange heat with a first refrigerant of a first stage system and directed through an evaporator of the second stage system to defrost the evaporator. Also, the system has a defrost circuit where a second refrigerant is drawn from an intermediate point of a condenser of a second stage system, directed through a heat exchanger to exchange heat with a second refrigerant of the second stage system in a liquid state and directed through an evaporator of the second stage system to defrost the evaporator.