SIZING A WATER HEATER Determine use Choose appropriate sizing chart

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Presentation transcript:

SIZING A WATER HEATER Determine use Choose appropriate sizing chart Residential, commercial, school, restaurant, etc. Choose appropriate sizing chart See chart on last slide. Determine number of persons Total number of persons who will use the building Recommended capacity of the WH tank (in terms of gallons per person per day) Use a maximum of 2 gallons per person per day for office buildings

SIZING A WATER HEATER Tank efficiency Determine usable capacity Rating of a WH tank in terms of percentage of hot water available at or near the system design temperature. Assume a tank efficiency of 70%. Determine usable capacity Recommended capacity in gppd * no. of persons Determine actual capacity Usable capacity/tank efficiency

SIZING A WATER HEATER Find required recovery rate per person Recovery rate is the water heating capacity of a water heater in terms of gallons per person per hour. Use relevant chart (will be provided, if not in the textbook) to find out recovery rate per person. Calculate total recovery rate Total recovery rate = recovery rate per person*no. of persons

Fig. 10.23 (p. 610, Stein)