Spring/Fall or at Night (Mild Weather)
Energy
Savings Calculations
- not including freezing water at night.
Harry Truman: If you can't stand the heat, get out of the kitchen
Fridge: I can't stand the heat, get me out of the kitchen
The Window R/F can save electricity in mild weather (spring, autumn or at night). Without air conditioner, outdoors is usually colder than indoors. The kitchen, because of the oven and the indoor refrigerator is usually the warmest place in a home. When air conditioner is On, there is no net energy savings (see bottom for illustration). Besides many homes don't have A/C or the A/C is not used to cool the kitchen.
For example, in NYC the window R/F can save approximately 40%, in Reno 47%, in Miami 1%, in and in Anchorage 71% over a similar indoor R/F (to download the MS. Excel Spreadsheet for these HTML files, change the file extension from *.htm to *.xls in your browser)
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The Indoor R/F must transfer
heat from its inside (at 42 °F) to its outside (at 72 °F). This temperature gap is: 72 - 42 = 30
°F |
The Window R/F must transfer
heat from its inside (at 42 °F) to its outside (at 52 °F) This temperature gap is: 52 - 42 = 10
°F The workload on the Window R/F
is much less (1/3), resulting in energy savings,
higher efficiency (COP) and prolonging the R/F's life.
In addition, since a part of the Window R/F is
outdoors, it (the insulated box) gains heat more slowly resulting in
additional energy savings. |
