Knudsen, Hans Jørgen Høgaard1; Christensen, Kim Gardø3; Jensen, Per Henrik1
1 Department of Energy Engineering, Technical University of Denmark2 Danish Technological Institute3 Danish Technological Institute
Carbon dioxide as primary and/or secondary refrigerant
Heat transfer for boiling and condensing carbon dioxide has been investigated.Heat transfer for carbon dioxide evaporating inside pipe has been measured and compared with Shah's correlation. The measured heat transfer coefficient is much higher than the value determined with the correlation.A shell-and-tube heat exchanger with carbon dioxide on the shell side and flow ice inside the tubes has been used to investigate the heat transfer for condensing carbon dioxide.At leats is mentioned results obtained with a frozen food display case using carbone dioxide as refrigerant.