Description: an apartment building has a pumped ring main that circulates hot water at 75 c through insulated 40 mm pipe with heat loss of 17 watts/metre. at each apartment, this hot water is mixed with cold water to a delivery temperature of 50c? one of the sub-questions provides extra info: it takes 0.00119 kwh/degree/litre to heat water from 15c to 50c.
my problem:
with typical water-efficient shower and taps, typical melbourne usage of hot water is 44 litres/day/person. for typical occupancy of 1.8 people, what is the effective efficiency of this hot water distribution system (for simplicity assume the existing heating system feeding the distribution system is 100% note that this efficiency calculation ignores the efficiency of production of hot water.
if anyone can me or if anyone has any idea that would be great!
: )