Ground‐Source Heat Pumps

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Ground‐Source Heat Pumps ( ground‐source-heat-pumps )

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• Buildings under about 100,000 sq. ft. tend to use unitary packaged space‐ conditioning equipment and make up the primary target market for commercial GSHPs • Roughly half the commercial space‐conditioning energy consumption is associated with packaged unitary equipment. The 2008 Buildings Energy Data Book reports that 2006 commercial space‐ conditioning primary energy consumption was (not including ventilation equipment): • Space Heating: 2.17 Quad (1.18 Quad is natural gas) • Space Cooling: 2.27 Quad (almost all electricity) • Total: 4.44 Quad. Based on the assumptions above, about half of this was consumed by the target market, or roughly 2 Quad. As noted above, typical GSHPs energy savings are between 20 and 45 percent, depending on climate. If we use 30 percent as a mid‐ range savings, commercial GSHPs could save about 0.6 Quad if applied in all unitary space‐conditioning applications. 3.9.3 School Technical Potential Public schools (K‐12), a subset of commercial buildings, are a noteworthy early market for GSHPs, because they often have ample space for the ground coil and often can justify longer payback periods compared to buildings in the private sector. Schools can potentially achieve 25‐50% in space‐conditioning energy savings using GSHPs. We estimate the technical potential energy savings associated with schools (included in the 0.6 Quad estimate in Section 3.9.2 above) to be 0.03 Quad nationally, due to the fact that schools represent only about 2.5% of commercial floor space (DOE 2008). 3.10 Energy Prices Figure 3‐23 shows the residential utility prices used in this analysis. Prices are 2006 averages for each census region. As discussed in Section 3.6 above, we assumed that utility prices (corrected for inflation) do not change during the time period of our market projections unless a carbon tax is imposed. U.S. Department of Energy 55

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