Question
I am having problems with question two in the lab. the equation for Ecooling is E-cooling.=,E-heatgain.+,E-ventilationair.−,E-exhaustionair. The problem with this is Qe and Qv are always equal to each other. Therefore, when you find their mass by multiplying by density their are always equal. Then when you find their energies by multiplying each by their masses then they are equal again. So, E-ventilationair ends up being equal to E-exhaustionair end up being equal to each other and cancel each other out when calculating for Ecooling and Ecooling ends up being equal to E-heatgain. When calculating utility cost you multiply the E-lectricty by the Electricity price. So, the electricity consumed and the utility cost ends up not being dependent on a change in Qe or Qv. Please let me know if I have some part of this equation wrong because when I am changing my Qv nothing is happening to the utility cost or the electricity consumed.
Answer
The difficulty you’re having stems almost certainly from the fact that you’re not incorporating the fact that the temperature coming in is not the same as the temperature leaving. If you use those temperatures the energy is different and you’ll have meaningful numbers.
Jim Mitchell
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