How High Temperature Heat Pumps can Resort to the Reputation of Reheat Coils in Existing Buildings

There many buildings have an Air Handler with a pre-heat coil and cooling coil ducted to reheat coils. This provides very effective environmental control. The inefficiency of the system comes in the fact that the cooling system is rejecting heat out of the building while a boiler is supplying fresh heat into the building. Well, intention energy savings measures that raised the cooling coil discharge temperature often left rooms muggy and uncomfortable and even worst caused mold. Dedicated Heat Recovery Chiller (DHRC) were introduced to recycle the heat being rejected from the chiller to the reheat coils. This was highly effective in reducing energy consumption and reducing cost. However, DHRCs could only effectively deliver water to 140 degrees and most existing systems were designed to for Coil Entering Water Temperature (EWT) of 180F.

In the new building construction, the design approach has changed, and the systems are being designed with heating coil EWT of 140oF, thus making existing DHRC very effective.
The solution for existing buildings: High Temperature Heat Pump in a High Temperature Dedicated Heat Recovery Chiller (HT-DHRC) Configuration providing up to 190F hot water and 50F Chilled Water.