Chapter 9
9.1 A water heating system serving a commercial building maintained at 
is set up with a recirculation loop that assures quick availability of hot water at 
at all parts of the system. The estimated 
of this loop is 
The 
of the hot-water tank is 
Cold water enters the heater from the mains at 
Hot-water use in the building averages 610 liters/day Monday through Friday and 210 liters/day on weekends.
a. How much energy is required per week to heat the water (without considering losses)?
b. Estimate the total weekly energy to be supplied to this hot-water system if recirculation is continuous.
c. If the recirculation system is shut off from 6 pm to 8 am each night, if the total mass of pipe and water is equivalent to the water in 122 m of 19-mm-diameter tubing and if there is no hot-water ...
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