H4-KH-21-A operating conditions at the customer site dust c Helical speed reduction gearboxes H4

Flender/Flender Gear Units/Helical speed reduction gearboxes H4

ion calculations indicate that coefficients of per- formance of 1 . to 1.2 can be expected with better machines (ai,= 0.8 to 0.. This is the per- formance customary for passenger car air-conditioning systems using the CFC R1 today. In some applications for conventional CFC vapour refrigerating machines, such as mobile air- conditionin systems with high CFC emission levels, truck refrigeratin systems or stationary systems wit% to< -5 ", the use of cold-air refrigeratin systems wou? be more compatible with the environment, .. would involve lower ozone-jepleting potential and contribute less to the anthropogenic greenhouse effect. 2 Duration: 0.0.8 - 3.0.9 0ZH8D1 Subject: Collaborative project: Reduction of CFC emissions in air-conditioning/ refrigeration. Sub-project: Investigation of the combinations R1a/R1a and R2/R1a as ozone-conserving alternatives to refrigerant R1 Research centre: lnstitut fur Technische Thermodynamik und Kaltetechnik der Universitat Karlsruhe Kaiserstrasse 1, 7,1 1 Karlsru he Government sponsorship: DM 2,6.0 Sponsorship ratio: 5 YO 1. Purpose of the project In accordance with the ordinance banning CFCs, the refrigerant R1 (CF,CI,), which has primarily been used in refrigerators and freezers, commercial refrigerating installationsand air- conditioning equipment to date, may no longer be used in future because of its great ozone- depletin potential In view of theirsimilarthermodynamicproperties, the possiblesubstitutes include t8e chlorine-free refrigerants R1a (CH2F-CF and R1a (CH,-CHF,) R1a is non- combustible, but its relativelygreatpotentralforglobalwarmin isadisadvanta Owin toits combustion behaviour, R1a will not be used in domestic reqrigerators and ?eezers 8r the time being, although it has higher hydrogen content, meanin that it would be degraded more rapidly in the atmosphere and thus contribute far less toglo%al warming than R1a For these reasons, the Central Association of the Electrical Engineering