30 May 2005

NON-REVERSING, 100% OUTSIDE AIR HEAT PUMP FOR HEATING AND COOLING


Traditionally, a heat pump has relied on a reversing valve system design to achieve the bi-directional
requirements of heating and cooling. Unfortunately, the limits of performance using a reversing valve
have made applying it to a dedicated outside air system (DOAS) not possible or requires significant
preheating which makes the unit non-efficient. A new innovative concept will be explained that will
change how all Geo/WSHP projects are designed. It will give consultants the opportunity to expand heat
pump uses into projects that were not possible before. The new heat pump design will allow the heating,
cooling, and dehumidification of outside air without the use of any auxiliary heat source with EER values
above 14 and COP exceeding 6.0. The unit’s flexibility and how it integrates into a variety of loop
systems will be explained as well as its total system operation.