Physics, 28.05.2020 01:05 jamarstand
On a cool night, a passive solar house is losing 20,000 kJ/hr to the outside surroundings. The house contains 75 kg air and a water tank which when exposed to sunlight during the day heats up to 80 oC. What is the mass of water in the tank required to maintain the house air temperature at 22 oC for 10 hours overnight? The Cp for water is 4.184 kJ/kg/K and Cv for air = 0.718 kJ/kg/K.
Answers: 1
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Consider a 1000 w iron whose base plate is made of 0.5 cm thick aluminum alloy 2024-t6 (ρ = 2770 kg/m3 and cp = 875 j/kg°c). the base plate has a surface area of 0.03 m2. initially, the iron is in thermal equilibrium with the ambient air at 22°c. assuming 90% of the heat generated in the resistance wires is transferred to the plate, determine the minimum time needed for the plate temperature to reach 200°c.
Answers: 1
On a cool night, a passive solar house is losing 20,000 kJ/hr to the outside surroundings. The house...
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