domestic hot water and the second was to reduce the required ground heat exchanger requirements. While this reduced the amount of required ground heat exchanger, the system costs were still greater than the project could afford.
Further analysis showed through the performance of a parametric analysis with the DOE-2 software, a reduction in the amount of the ground heat exchanger would result in a higher loop water temperature with a concurrent increase in the space temperature. It was finally decided to limit the ground heat exchanger to between 200 to 220 lineal feet per ton. While this would result in a slight reduction in cooling capacity at towards the end of the cooling season, it would result in more heat being    

store in the ground that would be available for winter heating. After careful consideration of the trade-offs, the project proceeded with the installation of the GCHP systems in all 155 housing units.

Five years after completion, it has been indicated that there have been no problems with the GCHP systems and that the tenants are fully satisfied.




COPYRIGHT © 2010 GAI, Inc.


en-Solution Member Credits:                The “engineer of record” was Richard A. Gordon, P.E. of Gordon and Associates, Inc.