John and his House
John has a power washer, and plans to clean the siding of his house this weekend. John can not find the instruction of the power washer, hence he does not know the power needs for running it.
What is known:
- Water enters the washer at 20 oC and 1 atm with a volumetric flow rate of 0.1 L/s through a 25-cm-diameter hose
- Water leaves the jet at
23 oC, 1 atm, and a velocity of 50 m/s at an elevation of 5 m
- The magnitude of the heat transfer rate from the power unit to the surroundings is 10% of the power input