(a) A cold-water storage cistern is 70m vertically above a centrifugal pump which is to be used for raising 60000 litres of water from a low-level break cistern every 4 hours. Allowing 20 percent of the height for pipe friction, and the efficiency of the pumping equipment is 88%, calculate the cost of pumping water continuously for one fortnight, with a mandatory cool down of four hours each day, if the electricity rate is $7.00 for first 100Kw and then $10.00 for next 1100Kw. (b) Calculate the time in hours that it will take to raise the temperature of 150kg of water from 10°C to 100°C by means of a 3 kW immersion heater when the heat losses are 10 percent and the specific heat capacity of water is 4.2 kJ.
(a) A cold-water storage cistern is 70m vertically above a centrifugal pump which is to be used for raising 60000 litres of water from a low-level break cistern every 4 hours. Allowing 20 percent of the height for pipe friction, and the efficiency of the pumping equipment is 88%, calculate the cost of pumping water continuously for one fortnight, with a mandatory cool down of four hours each day, if the electricity rate is $7.00 for first 100Kw and then $10.00 for next 1100Kw. (b) Calculate the time in hours that it will take to raise the temperature of 150kg of water from 10°C to 100°C by means of a 3 kW immersion heater when the heat losses are 10 percent and the specific heat capacity of water is 4.2 kJ.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:(a) A cold-water storage cistern is 70m vertically above a centrifugal pump which is to be used for raising
60000 litres of water from a low-level break cistern every 4 hours. Allowing 20 percent of the height for pipe
friction, and the efficiency of the pumping equipment is 88%,
calculate the cost of pumping water continuously for one fortnight, with a mandatory cool down of four hours
each day, if the electricity rate is $7.00 for first 100Kw and then $10.00 for next 1100Kw.
(b)
Calculate the time in hours that it will take to raise the temperature of 150kg of water from 10°C to
100°C by means of a 3 kW immersion heater when the heat losses are 10 percent and the specific heat
capacity of water is 4.2 kJ.
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