Abstract
The requirements for environmentally friendly refrigerants promote
application of CO2and water as working fluids. However there are two
problems related to that, namely high temperature limit for CO2in
condenser due to the low critical temperature, and low temperature limit
for water being the result of high triple point temperature. This can be
avoided by application of the hybrid adsorption-compression system, where
water is the working fluid in the adsorption high temperature cycle used
to cool down the CO2compression cycle condenser. The adsorption process is
powered with a low temperature renewable heat source as solar collectors
or other waste heat source. The refrigeration system integrating
adsorption and compression system has been designed and constructed in the
Laboratory of Thermodynamics and Thermal Machine Measurements of Cracow
University of Technology. The heat source for adsorption system consists
of 16 tube tulbular collectors. The CO2compression low temperature cycle
is based on two parallel compressors with frequency inverter. Energy
efficiency and TEWI of this hybrid system is quite promising in comparison
with the compression only systems.
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