Repozytorium publikacji - Politechnika Gdańska

In the paper presented are authors own concepts of high temperature compressor heat pumps for the utilisation of medium and low temperature sources of heat. Working fluids for use in high temperature heat pumps are discussed, as well as the criteria for their selection. Analyses are presented for the production of in the upper steam source at 130 °C. One-stage systems and cascade systems were analyzed. An analysis of the coefficient of performance (COP) and the most important characteristic values of the cycle for the selected working fluids was performed. The substance that achieved the highest COP was ethanol. Calculations have shown that this operating medium is most effective at a very wide temperature range from 80 to 150 °C, making it a promising prospect for use in high temperature heat pumps. For ethanol, the most thermodynamically advantageous is the basic one-stage system, without subcooling. In the case of a suitably high degree of subcooling, cascade systems such as R365mfc/R1234ze (Z) and pentane / R1234ze (Z) have also been considered.

Autorzy

• prof. dr hab. inż. Dariusz Mikielewicz link otwiera się w nowej karcie ,
• dr hab. inż. Jan Wajs link otwiera się w nowej karcie