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1. (WO2017037747) CONTROL METHOD FOR DEFROSTING THE OUTDOOR COIL OF A HEAT PUMP MACHINE

Pub. No.:    WO/2017/037747    International Application No.:    PCT/IT2015/000210
Publication Date: Fri Mar 10 00:59:59 CET 2017 International Filing Date: Sat Sep 05 01:59:59 CEST 2015
IPC: F25B 47/02
F25B 49/02
Applicants: INGERSOLL-RAND INTERNATIONAL LTD
Inventors: RENNA, Giuseppe Giovanni
Title: CONTROL METHOD FOR DEFROSTING THE OUTDOOR COIL OF A HEAT PUMP MACHINE
Abstract:
Method for controlling defrosting of the outer exchanger of a heat pump machine, comprising the steps of: defining in the outer air temperature/evaporation temperature plane three zones; acquiring the outer air temperature and the evaporation temperature; individuating in which zone of the Taria_ext/T_evap plane the point falls, identified by the two acquired temperature measures; inverting the machine functioning cycle when the point falls in an unsafe zone; reducing the rotation speed of the compressor of said heat pump machine when the point falls in an intermediate zone.