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CX-002022: Categorical Exclusion Determination

Adult Detention Facility Energy Conservation Projects - Domestic Hot Water Heat Pump
CX(s) Applied: B5.1
Date: 04/27/2010
Location(s): Lancaster County, Nebraska
Office(s): Energy Efficiency and Renewable Energy

The energy modeling for the new county detention facility's domestic hot water requirements shows a peak energy consumption of 5.7million British Thermal Units (MMBtu) per hour with an annual usage of 14,241 MMBtu/year (based on 1000 bed occupancy). This energy use is equivalent to 123 % the estimated space heating requirements, which is 11,550 MMBTU/year. The building energy modeling also indicates the overall space conditioning requirements will be cooling load dominated, on an annual basis. With the system being cooling load dominated the geothermal well field temperature will trend up over time. One approach to address the temperature issue is improving the system's thermal balance by adding heating load. Therefore, the District Energy Corporation (DEC) working with Farris Engineering and Clark Enersen Partners evaluated the economics and operational benefits of integrating the domestic hot water system with the DEC's geothermal system.