18 May 2017

O.4.9.1 The Integration of Ammonia Electrochemical Compressor in Vapor Compression System

An electrochemical compressor was proposed to improve the efficiency of the vapor compression cycle and the reliability of the compressor by eliminating moving parts. The electrochemical compressor designed based on the proton exchange membrane fuel cell can compress ammonia as a working fluid while using hydrogen as a carrier gas by charging a DC voltage to the membrane electrolyte assembly. From the previous research, the transfer ratio between ammonia and hydrogen was found to be 2. The electrochemical compressor stack design was proposed for scaling up cooling capacities. In this study, the thermal management of the electrochemical compressor stack is investigated. For the removal of heat from cathode side, using different types of heat exchanger design is discussed, which includes open channel, microchannel flat tube and metal foam heat exchanger. Then the isothermal compressor efficiency and system COP are modeled when the ammonia electrochemical compressor is used in the vapor compression cycle. The system can potentially be more energy efficient than the conventional vapor compression cycle driven by the mechanical compressor.