Abstract
We herein evaluate the use of a chemical heat pump (CHP) for upgrading waste heat. CaCl2 was used in the system of CHP. We evaluated the heat storage and heat releasing of CHP, and confirmed the practicality from the experimental results. The reactor module employed was an aluminum plate-tube heat exchanger with corrugated fins, and the CaCl2 powder was in the form of a packed bed. Heat storage operation and heat dissipation operation are performed at the same time and supplied to the heat demand destination. At this time, an environmental heat source can be used during the heat radiation operation, and the heat output can release more heat than the heat input during heat storage. The heat discharging and charging characteristics of the reactor module were evaluated experimentally. The coefficient of performance (COP) was calculated for the heat upgrading cycle, and the heat output in the system was determined. A COP of 1.42 and output of 650 W/L, based on the heat exchanger volume, were obtained using a 600 s change time for the heat pump.
Highlights
The development of technologies and systems for enhancing energy efficiency to mitigate CO2 emissions has received increasing attention in recent years [1] [2] [3]
We evaluate the use of a chemical heat pump (CHP) for upgrading waste heat
When the average output reaches the peak of 700 W/L-HEX, coefficient of performance (COP) decreases suddenly
Summary
The development of technologies and systems for enhancing energy efficiency to mitigate CO2 emissions has received increasing attention in recent years [1] [2] [3]. Processes and technologies such as the organic rankine cycle [4], thermoelectric power generation [5] [6], heat pumps [7], sensible heat storage [8], and chemical heat pumps have been reported. Among these technologies, the chemical heat pump (CHP), driven by reversible chemical reactions, is a promising technology for contributing to the need to utilize thermal energy. CHPs have been investigated in a number of cycle modes, namely heat storage, heat upgrading, and chiller heat modes
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