For boilers, the annual pump energy consumption is negligible (<50 kWh per year) and not included in this calculation. There are no peak demand savings as it is a heating only measure. Although there is a significant electric savings, there is also an associated increase in natural gas energy consumption. While this gas consumption does not count against PA Act 129 energy savings, it is expected to be used in the program TRC test. The increased fossil fuel energy is obtained through the following formulas: Gas consumption with natural gas furnace: Definition of Terms CAPYelec heat = Total heating capacity of existing electric baseboards or electric furnace (BtuH) CAPYASHP heat = Total heating capacity of existing electric ASHP (BtuH) CAPYfuel heat = Total heating capacity of new natural gas furnace (BtuH) EFLHASHP = Equivalent Full Load Heating hours for Air Source Heat Pumps EFLHelec furnace = Equivalent Full Load Heating hours for Electric Forced Air Furnaces EFLHelec bb = Equivalent Full Load Heating hours for Electric Baseboard systems EFLHfuel furnace = Equivalent Full Load Heating hours for Fossil Fuel Furnace systems HSPFASHP = Heating Seasonal Performance Factor for existing heat pump (Btu/W▪hr) AFUEfuel heat = Annual Fuel Utilization Efficiency for the new gas furnace (%) HPmotor = Gas furnace blower motor horsepower (hp) = Efficiency of furnace blower motor ηmotor The default values for each term are shown in Table 238.
For boilers, the annual pump energy consumption is negligible (<50 kWh per year) and not included in this calculation. There are no peak demand savings as it is a heating only measure. Although there is a significant electric savings, there is also an associated increase in natural gas energy consumption. While this gas consumption does not count against PA Act 129 energy savings, it is expected to be used in the program TRC test. The increased fossil fuel energy is obtained through the following formulas: Gas consumption with natural gas furnace: Definition of Terms CAPYelec heat = Total heating capacity of existing electric baseboards or electric furnace (BtuH) CAPYASHP heat = Total heating capacity of existing electric ASHP (BtuH) CAPYfuel heat = Total heating capacity of new natural gas furnace (BtuH) EFLHASHP = Equivalent Full Load Heating hours for Air Source Heat Pumps EFLHelec furnace = Equivalent Full Load Heating hours for Electric Forced Air Furnaces EFLHelec bb = Equivalent Full Load Heating hours for Electric Baseboard systems EFLHfuel furnace = Equivalent Full Load Heating hours for Fossil Fuel Furnace systems HSPFASHP = Heating Seasonal Performance Factor for existing heat pump (Btu/W▪hr) AFUEfuel heat = Annual Fuel Utilization Efficiency for the new gas furnace (%) HPmotor = Gas furnace blower motor horsepower (hp) ηmotor = Efficiency of furnace blower motor The default values for each term are shown in Table 238.
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