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Developed by Chinese researchers, the system is designed to achieve a heat output of 5.7 kW and an overall coefficient of performance of 1.40 under nominal conditions.
Researchers led by the Chinese Academy of Sciences have designed a novel thermo-acoustic heat pump system which they claim is capable of using low/medium grade heat for heating supply in domestic applications.
“The system consists of a simple power conversion thermoacoustic unit in a direct coupled configuration, greatly reducing system complexity compared to traditional multistage thermoacoustic systems,” they explain, adding that the device has no parts. mobile.
The system is designed to achieve a heat output of 5.7 kW and a global coefficient of performance (COP) of 1.40 under nominal conditions. It is made with a motor unit, a heat pump unit and a looped gas resonator unit.
The engine consists of a sink heat exchanger, a regenerator, a high temperature heat exchanger, and a thermal buffer tube. The refrigerating unit consists of a heat dissipation heat exchanger, a regenerator, a high temperature heat exchanger and a thermal buffer tube.
The system is initially excited by thermoacoustic oscillation and uses the amplified acoustic power to drive the heat pump unit to pump heat from the heat source to the heat sink.
"The temperature of the heat source varies between 260 K and 310 K, which reflects the variations in performance of the system throughout the seasons," the scientists emphasize. “The heat sink temperature ranges from 298K to 363K, covering the range of applications from low-temperature underfloor space heating to domestic hot water supply.”
According to the research team, the heat pump is capable of offering stable COP values ??that vary between 1.1 and 1.5 over most of the temperature range. “Especially in the typical domestic heating supply temperature range of 50-70 C, the proposed heat pump system can pump several kilowatts (1-11 kW) of heat from a 260 K heat source at 310 K with remarkable efficiency”, he also pointed out.
The research team is made up of academics from the Karlsruhe Institute of Technology (Germany) and Tsinghua and Southeast Universities (China). Their findings were published in the article “ A heat-driven thermoacoustic heat pump with a single direct-coupling configuration capable of utilizing medium/low-grade heat for domestic applications ”. direct capable of using low/medium grade heat for domestic applications), published in Energy Proceedings . |
