Energy use for these types of water
heaters is given by the following equation.Energy use for these types of water
heaters is given by the following equation.
|
WHEU = HARLj + PILOT j EFFj × 0.92 j |
Equation 38 |
where
WHEUj = Hourly fuel energy use of the water heater (Btu), adjusted for tank insulation. HARLj = Hourly adjusted recovery load. For independent hot water storage tank(s) substitute
HARLj from Section B3. .
EFFj = Efficiency (fraction, not %). To be taken from CEC Appliance Database or from manufacturers literature. These products may be rated as a recovery efficiency, thermal efficiency or AFUE.
PILOTj = Pilot light energy (Btu/h) for large instantaneous. For large instantaneous water heaters, and hot water supply boilers with efficiency less than 89 percent assume the default is 750 Btu/hr if no information is provided in manufacturer’s literature or CEC Appliance Database.
0.92 = Adjustment factor used when system is not supplying a storage system.