Homework Help: PHYSICS

Posted by M BIL on Thursday, May 31, 2012 at 1:22am.

Q1=
An 85 cu.meter room.
- How much energy required to heat room temperature from 5C to 22C.

- How long in minutes

Q2=

- a 40 Liter radiator in the same room above. energy input is 5400 watts. In order to increase room temperature from 5C to 22C, how long 5400 Watts will be supplied to radiator and what water temperature is required in radiator to maintain 22C in the room?
Thank you

PHYSICS - drwls, Thursday, May 31, 2012 at 2:47am
Q1: It depends upon the heater power level. You should have been provided that infomation.

Q2 depends upon heat loss rate out of the room. I don't know how to answer this with the information provided.

This may help, but it looks rather complicated:

http://www.engineeringtoolbox.com/heat-emission-radiators-d_272.html

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