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Träfflista för sökning "WFRF:(Lundqvist D) srt2:(2000-2004)"

Sökning: WFRF:(Lundqvist D) > (2000-2004)

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  • Cederström, Björn, et al. (författare)
  • Focusing hard X-rays with old LPs
  • 2000
  • Ingår i: Nature. - : Springer Science and Business Media LLC. - 0028-0836 .- 1476-4687. ; 404:6781, s. 951-951
  • Tidskriftsartikel (refereegranskat)
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  • Fernando, W. Primal D., et al. (författare)
  • Propane Heat Pump with Low Refrigerant Charge : Design and Laboratory Tests
  • 2004
  • Ingår i: International journal of refrigeration. - : Elsevier BV. - 0140-7007 .- 1879-2081. ; 27:7, s. 761-773
  • Tidskriftsartikel (refereegranskat)abstract
    • Independently of the choice of refrigerant, environmental and or safety issues can be minimised by reducing the amount of refrigerant charge per heat pump or refrigeration system. In the investigation reported here, a laboratory test rig was built, simulating a water-to-water heat pump with a heating capacity of 5 kW. The system was designed to minimize the charge of refrigerant mainly by use of mini-channel aluminium heat exchangers. It was shown that the system could be run with 200 g of propane at typical Swedish operating conditions without reduction of the COP compared to a traditional design. Additional charge reduction is possible by selecting proper compressor lubrication oils or by using a compressor with less lubrication oil.
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  • Fernando, W. Primal D., et al. (författare)
  • The Solubility of Propane (R290) with Commonly Used Compressor Lubrication Oils
  • 2003
  • Ingår i: Compressors and Their Systems. - 1860584179 ; , s. 157-166
  • Konferensbidrag (refereegranskat)abstract
    • An ongoing project called "Charge minimisation of a small capacity heat pump" is aimed to minimise the refrigerant charge in heat pumps, refrigeration and air-conditioning systems. The experimental heat pump was run with propane as refrigerant and the designed heat capacity (condenser capacity) was over 5kW. Tests were done to investigate the refrigerant charge distribution in different sections of the heat pump, while it was running. The experiments done so far have shown that the amount of refrigerant in the compressor is higher than expected. This paper presents the measured refrigerant masses in a hermetic scroll compressor together in suction line and the calculated refrigerant mass dissolved in the compressor lubrication oil at different evaporation temperatures. Finally, solubility tests of propane with different lubricating oils are presented. The tests show that the propane is more soluble in POE than PAG oils.
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