Improvement of COP of vapour compression heat pumps by using a new cycle
This work concerns the development of a new vapour compression refrigeration cycle and a study of oil-refrigerant interactions, in order to improve heat pump performance. It is shown that oil degrades performance by reducing evaporator heat pick-up and by increasing evaporator pressure drops. The behaviour at high and low refrigerant quality are very different; there are indicators that low viscosity oil should be used at low concentrations and high viscosity at high concentrations. In a partly regenerative refrigeration cycle, the compressor is used rather than an expansion valve to reduce the pressure of the refrigerant from condenser to evaporator. The test rig achieved values of COP(h) some 30% higher than the conventional system. There were, however, reliability problems.
Bibliographic Reference: EUR 12694 EN (1990) 41 pp., MF, ECU 4, blow-up copy ECU 6.25
Record Number: 199011050 / Last updated on: 1994-12-01
Original language: en
Available languages: en