Back in the days in KL, we coupled our chillers to heat pumps for simultaneous cooling and heating needs. Cooling for space air-conditioning and rejected heat from the chillers, is supplied to heat pumps to generate hot water use in the kitchens, laundries and swimming pools. And chilled water by-product from the heat pumps is returned to the chilled water circuit!
Why wouldn’t you, if you can double the overall COP of the system? The payback is +/- five years, this is a simple rate of return of ~20%. In perspective, what other investment will return ~20% annually?
It makes sense to invest in energy efficiency, it makes even more sense to have the right engineer to make sure that designs are aligned to the first priority of the ENERGY HIERARCHY … its top three priorities being LEAN, KEEN and GREEN!