I need energy-optimal solution for summer cooling and winter heating, with 200 -400 ton capacity, while the outside temp. is 27 -35 Celsius in summer and 7 - 20 Celsius in winter.
I am wondering, what is the best available technology for air cooled (probably, variable speed screw or centrifugal) chiller with heat pump (reverse operation)?
I did not manage to find any variable speed solutions of this type on the market. Are any under development? Any advice about alternatives?