Then there are more complex strategies, such as that implemented for a regional hospital project in BC Canada, that use hot, cold, and temperate water loops with two water-to-water heat pumps to facilitate recovery of heat from low-temperature sources, such as the exhaust air stream, to heat both DHW and occupied spaces. A strategy such as this presents an opportunity for solar heating of both DHW (heating cold water from the mains) and for putting heat into the heat recovery loop that is then a resource for water-source heat pumps.
The range of applications for the solar HW in ApacheHVAC will further expand as IES adds water-to-water heat pumps and additional configuration options. Presently, however, users can model heat-recovery chillers and can upgrade the temperature of condenser heat from a chiller set via a single-COP heat pump option on the HW loop.
