A 150 L (~ 40 gal) electric hot-water tank has a 5.0 kW heater. Part A...

Question

Question

A 150 L (~ 40 gal) electric hot-water tank has a 5.0 kW heater. Part A How many minutes will it take to raise the water tempe

Answer 1

Answer #1

T1 = 63 F = 17.22 C

T2 = 145 F = 62.78 C

now mass of the water to be warmed

M = density * volume = 1000* 150* 10^-3

M = 150 kg

now

t = W/ P

t = M c ( T2 - T1) / P

t = 150* 4186* ( 62.78 - 17.22) / 5000

t = 5721.425 s

t = 95.35 min

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Comment before rate in case any doubt, will reply for sure.. goodluck

Answer 2

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