Axair Climate Limited is able to offer a wide range of high performance products from Hitachi.

Particularly advantageous is improved part-load performance. Chillers are normally selected to cool against the peak load that will occur in the building, with a safety factor. These loads occur on only a few days each year, so a chiller will be running at part load for 95% of the year, if not more.

Compressors such as those used in Hitachi chillers are renowned for their part-load efficiency, and a chiller operating at 20°C ambient and at 70% capacity will have a COP almost double that at 35°C and 100% capacity – from 3 at full load to 6 at the part load. This effectively halves the power input, so running costs are also reduced. To further boost efficiency, compressors have modulating capacity slide valves, so they only use the energy required to meet the cooling demand, which also improves control of the system to give further energy savings.