Bevel-helical gear unit B3 G l kg Hollow shaft for shrink disk HDV H B3VV-12-C

Flender/Flender Gear Units/Bevel-helical gear unit B3

or solving the CFC-ozone problem Research centre: lnstitut fur Kaltetechnik und Angewandte Warmetechnik der Universitat Hannover Welfengarten 1 , 3 6 Hannover Government sponsorship: DM 9,7 0 Sponsorship ratio: 8% The research project ,,Evaluation of alternative cycles and fluids for solving the CFC-ozone problem is divided into the following four sub-projects Evaluation of the oil behaviour of the refrigerant mixtures R2/R1a and R1a/R1a, Evaluation of practical problems with non-azeotropic refrigerant mixtures, . Vapour compression cycle with solution circuit using environmentally benign refrigerants, Application of the cold-air process in air-conditioning and refrigeration for solving the ozone problem . Evaluation of the oil behaviour of the refrigerant mixtures R2/R1a and R1alR1a ~ ~~~~~ ~ ~~~ ~~~~~ 1. Purpose of the project Within the scope of this research project, the non-azeotropic refrigerant mixtures R2/R1a and R1a/R1a were to be examined as short-term substitutes for the refrigerant R1, which has high ozone-depletion potential If the suitability of refrigerants for use in refriger- ating systems is to be assessed, their behaviour vis--vis refrigerator oils must be known Tests for rotary compressors. were to be performed using two refrigerator oils, one for reciprocating compressors and one - - - __ 2. Working steps The work on this project was divided into five parts. The first part involved the construction and/or conversion of the test set-up for the subsequent solubility investigations with the oil/ refrigerant mixtures. In the further course of the project, the liquid viscosities and densities of the ternary mixtures were measured. The lnstitut fur Kaltetechnik und Angewandte Warme- technik has pressure-proof falling-ball viscometer at its disposal for determining the viscosi- ties. The boiling densities were measured by pyknometry. 3. Results The chlorine-free refrigerants R2, R1a and R1a displa insufficient solubili