reduction because dishwashers will adjust hot water temperature to necessary levels using internal heating elements. This protocol documents the energy savings attributed to reducing the electric or heat pump water heater temperature setpoint. The target sector primarily consists of single-family residences. A The annual energy savings calculation utilizes average performance data for available residential water heaters and typical water usage for residential homes. The energy savings are obtained through the following formula, where the first term corresponds to tank loss savings and the second to clothes washer savings: Demand savings result from reduced hours of operation of the heating element, rather than a reduced connected load. The demand reduction is taken as the annual energy savings multiplied by the ratio of the average demand between2 PM and 6 PM on summer weekdays to the total annual energy usage. kWpeak = ETDF (Energy to Demand Factor) is defined below: The ratio of the average demand between 2 PM and 6 PM on summer weekdays to the total annual energy usage is taken from an electric water heater metering study performed by BG&E (pg 95 of Source 2). The parameters in the above equation are listed in Table 264 below.
reduction because dishwashers will adjust hot water temperature to necessary levels using internal heating elements. This protocol documents the energy savings attributed to reducing the electric or heat pump water heater temperature setpoint. The target sector primarily consists of single-family residences. The annual energy savings calculation utilizes average performance data for available residential water heaters and typical water usage for residential homes. The energy savings are obtained through the following formula, where the first term corresponds to tank loss savings and the second to clothes washer savings: Demand savings result from reduced hours of operation of the heating element, rather than a reduced connected load. The demand reduction is taken as the annual energy savings multiplied by the ratio of the average demand between2 PM and 6 PM on summer weekdays to the total annual energy usage. kWpeak = ETDF (Energy to Demand Factor) is defined below: The ratio of the average demand between 2 PM and 6 PM on summer weekdays to the total annual energy usage is taken from an electric water heater metering study performed by BG&E (pg 95 of Source 2). The parameters in the above equation are listed in Table 264 below. A
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