- #1
Gonger
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I have a question I'm trying to but I don't really know where to start. It is kind of an add-on to a previous question that I got pretty easliy. This is the first question:
The answer to that was 156000 W. Now the second question asks how much heat must be supplied to raise the temperature and this is what I don't know how to do. This is the second question:A house has well-insulated walls (assume same thermal conductivity as air, 0.023 W/(m·K)) 16.2 cm thick, with an area of 415 m2, a roof of wood (conductivity 0.10 W/(m·K)) 7.0 cm thick, with an area of 290 m2, and plain glass (conductivity 0.84 W/(m·K)) windows 0.60 cm thick, with an area of 31.7 m2. Assuming that the heat loss is only by conduction, calculate the rate at which heat must be supplied to this house to maintain its temperature at 20.1 °C if the outside temperature is -11.7 °C.
If anybody has any help for me that would be great. ThanksIf the house is initially at 13.8 °C, calculate how much heat must be supplied to raise the temperature to 20.1 °C within 29.0 min. Assume that only the air (specific heat 1004 J/(kg·K), density 1.29 kg/m3) needs to be heated and that its volume is 750 m3.
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