heat transfer rates through a bedroom window with and without an a c unit
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Heat transfer rates through a bedroom window with and without an A/C unit

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Heat transfer rates through a bedroom window with and without an A/C unit . Sam Sanderson David Theurer December 2006. Description of Problem.

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heat transfer rates through a bedroom window with and without an a c unit

Heat transfer rates through a bedroom window with and without an A/C unit

Sam Sanderson

David Theurer

December 2006

description of problem
Description of Problem
  • A bedroom window has been fitted with a window mounted air conditioning unit. The window has been opened and plexiglas cut and fit to cover the remaining opening.
report question
Report Question
  • How much heat is lost through the window?
  • Six scenarios are considered.
    • A/C unit with blinds and curtains open
    • A/C unit with blinds closed and curtains open
    • A/C unit with blinds and curtains closed
    • No A/C unit with blinds and curtains open
    • No A/C unit with blinds closed and curtains open
    • No A/C unit with blinds and curtains closed
assumptions
Assumptions
  • We will only consider the heat modes of convection and conduction from the room to the window and convection and radiation from the outer surfaces to the outside.
  • We assume that the convection coefficient for the inside is 5 and for the outside is 15. These are both in the range of natural convection.
  • The room temperature is 70 degrees Fahrenheit and the outside temperature is 22 degrees Fahrenheit.
methods
Methods
  • Temperatures were measured using a temperature gun, inside the room, outside, and the at the outer surfaces.
  • Appropriate thermal circuits were constructed for each scenario.
  • Heat transfer rates were calculated using the temperatures measured and the circuits.
results
Results

Scenario Heat Transfer (W)

1 A/C only 125.5

2 A/C w/ blinds 125.2

3 A/C w/ blinds & curtains 121.1

4 No A/C 124.3

5 No A/C w/blinds 121.1

6 No A/C w/blinds & curtains 117.3

discussion of results
Discussion of Results
  • We expected the first three scenarios to have a much higher heat transfer rate than the last three scenarios.
  • Reasons why they were so similar could be:
    • The plexiglas allows high rates of heat transfer, but the two windows stacked together allowed much lower rates of heat transfer which lowered the total heat transfer rates
    • Radiation from inside the room is neglected
discussion of results9
Discussion of Results
  • We expected the highest heat transfer rate to be scenario 1 and the lowest to be scenario 6. This was true but the numbers were closer than expected.
  • Each time more insulation was added (closing the blinds and the curtains) the heat transfer rate dropped with the curtains making the largest difference.
recommendations
Recommendations
  • In order to minimize the heat loss through the bedroom window, the following actions should be taken:
    • The A/C unit and plexiglass should be removed
    • The window should be closed
    • The blinds should be closed
    • The curtains should be closed.
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