Das Projekt "New large scale heat-pump with non-polluting refrigerant R134A" wird vom Umweltbundesamt gefördert und von MAN Technologie AG durchgeführt. Objective: To demonstrate the viability of a large heat pump using an alternative type of refrigerant, which is not harmful for ozone layer. 6 cylinder gas engine drives a HP using a newly developped rugged screw type compressor and a new type of refrigerant developped by Hoechst, the R134A. The gas motor is of low polluting type and the refrigerant posseses no chlorine atom and thus does not cause breakdown of ozone layer nominal ratio heat output/gas input is 537/287 km, ie 1,87. 3 units are proposed for low temperature (46 degree of Celsius) heating of an existing office building, using outside air as heat source. 50 per cent of gas saving is forecast. Innovation: use of a new type of refrigerant in a large heat. General Information: 6 cylinder gas engine drives a HP using a newly developed rugged screw type compressor and a new type of refrigerant developed by Hoechst, the R134a. The gas motor is of low polluting type and the refrigerant posseses no chlorine atom and thus does not cause breakdown of ozone layer nominal ratio heat output/gas input is 537/287 km, ie 1,87. 3 units are proposed for low temperature (46 degree of Celsius) heating of an existing office building, using outside air as heat source. 50 per cent of gas saving is forecast. Innovation: use of a new type of refrigerant in a large heat.