Conductive Heat Loss in a house

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Homework Help Overview

The discussion revolves around calculating conductive heat loss in a house, specifically examining the impact of reducing indoor temperature from 73°F to 67°F while the outside temperature remains at 21°F. Participants are exploring the relationship between temperature difference and heat loss.

Discussion Character

  • Conceptual clarification, Mathematical reasoning, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the proportionality of heat loss to the temperature difference, suggesting a formula involving a constant k. There are inquiries about the appropriate units for temperature and the implications of using absolute temperature scales. Some participants express uncertainty about the value of k and its relevance to the problem.

Discussion Status

The discussion is ongoing, with participants sharing insights about the relationship between temperature difference and heat loss. Some guidance has been provided regarding the formula, but there is no consensus on the value of k or a complete solution to the problem.

Contextual Notes

Participants have noted that the problem does not provide the value of k, leading to questions about its determination. There is a hint that absolute temperature units should be used, but the specifics of the problem setup remain unclear.

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Homework Statement


If only conductive heat loss was significant for a house, then by what percentage would you lower the heat loss if the temperature was reduced inside from 73°F to 67°F, when the outside temperature is 21°F? (Hint: Try using a ratio.)


Homework Equations


Unknown


The Attempt at a Solution


I do NOT want the solution just need to know what formula i should use to find the answer.

possibly a example problem but NOT the answer please, i want to learn how to do it.
 
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The heat loss is proportional to the temperature difference.
So as an equation you would write Power = k * (Tinside-Toutside)
The value of K would depend on your units for temperature, the material the house is made of and it's insulation - the important point is that k does not change.

Remember as well that you need T in absolute units.
 
mgb_phys said:
The heat loss is proportional to the temperature difference.
So as an equation you would write Power = k * (Tinside-Toutside)
The value of K would depend on your units for temperature, the material the house is made of and it's insulation - the important point is that k does not change.

Remember as well that you need T in absolute units.

But because the power is proportional to the temperature difference you can express the temperatures in celsius as well as kelvin.Both give the same answer.
 
Thanks you guys are awesome
 
Could someone give me the answer the this problem? I have a similar problem and need help.
 
so what would the value of k be then? that's what i can't figure out.
 
i have Power=k(19.4C-(-6.1C))

k isn't given in the problem?
 

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