Method for heat exchange in a steam compression heat transfer system and a steam compression heat transfer system comprising an intermediate heat exchanger with a double row evaporator or condenser

摘要

A method for heat exchange in a steam compression heat transfer system having a working fluid circulating therethrough, comprising the steps of: (a) circulating a working fluid to an inlet of a first tube of an internal heat exchanger, through the internal heat exchanger and an outlet thereof; (b) circulate the working fluid from the outlet of the first tube of the internal heat exchanger to an inlet of an evaporator, through the evaporator to evaporate the working fluid, thereby converting it into a gaseous working fluid , and through an evaporator outlet; (c) circulating the working fluid from the evaporator outlet to an inlet of a second tube of the internal heat exchanger to transfer heat from the liquid working fluid of the condenser to the gaseous working fluid of the evaporator, through the heat exchanger internal heat, and at an outlet of the second tube; (d) circulating the working fluid from the outlet of the second tube of the internal heat exchanger to an inlet of a compressor, through the compressor to compress the gaseous working fluid, and to an outlet of the compressor; (e) circulating the working fluid from the compressor outlet to an inlet of a condenser and through the condenser to condense the compressed gaseous working fluid into a liquid, and to an outlet of the condenser; (f) circulating the working fluid from the condenser outlet to an inlet of the first tube of the internal heat exchanger to transfer heat from the condenser liquid to the evaporator gas, and to an outlet of the first tube; and (g) circulating the working fluid from the outlet of the first tube of the internal heat exchanger back to the evaporator, characterized in that the working fluid comprises HFC-1234yf and wherein the first tube has a diameter greater than the second tube , and the second tube is concentrically arranged in the first tube, and a hot liquid in the first tube surrounds a cold gas in the second tube.