The A/C loop is designed to minimize the cool-down transient in extreme conditions in terms of ambient temperature and humidity and the peak power required is three times higher than the steady-state level. This aspect becomes even more evident when the heat load is low or when only the dehumidification function is needed. Nowadays in almost all the cases the blown air temperature is performed reheating the air at the evaporator outlet, so an amount of refrigerant power is wasted.
The CRF developed a control algorithm that allows the regulation of the blown air temperature modulating the on-off threshold of the compressor. The threshold is selected on the basis of the cooling power demand and of the cabin relative humidity so to minimise the re-heating avoiding the risk of fogging.
The control of the compressor has been integrated with the adoption of a Internal Heat Exchangers that guarantees the efficiency increase in case of high thermal load.