Heat exchanger with double spiral cross-section - defining parallel passages giving increased area for heat transfer with increased efficiency

摘要

A heat exchanger has its cross-section constructed in the form of a double spiral so that two sets of parallel passageways are formed. One of the fluids flows through the passageways whilst the other fluids flows through the passageways. This form of construction means that each fluid flows over two surfaces which separate it from the other fluid and so the area of heat transfer is considerably greater than is the case with conventional tube or plate heat exchangers with a consequent increase in the rate of heat transfer.