Building Concepts Cooling (BCC)
BCC Exercise 1 Heat Pump Power
To maintain an interior temperature of 20C on a hot 30C day, a house with an overall conductance of 50 W/K needs to dump 500 watts of interior heat back outside. If you have a heat pump with a cooling COP of 5, what is the electrical input power needed? (Also, verify the thermal power above is correct.)
BCC Exercise 2 Evaporation Rate
To maintain an interior temperature of 20C on a hot 30C day, a house with an overall conductance of 50 W/K needs to dump 500 watts of interior heat back outside. (Also, verify the thermal power above is correct.) We are using a swamp or evaporative cooler to provide cooling. What is the rate of water in liters/hour that must be evaporated to provide this level of cooling?
BCC Exercise 3
What are the drawbacks of an evaporative cooling system in different climates and areas?
BCC Exercise 4 Heat Pump Electricity Use
A minisplit unit at Home Depot has a cost of $1600 and a SEER of 16 and a HSPF of 9. Recall that the Heating Seasonal Performance Factor (HSPF) and the Seasonal Energy Efficiency Ratio (SEER) are the BTU of heat transferred in or out of the home per watt-hour of electricity used.
This unit is installed in a building with an overall UA value of 300 BTU per hour per degree Fahrenheit in a climate with 6000 heating degree days per year in Fahrenheit-days.
What is the electricity used over the year?
5 Evaporative Cooler
You have a building with an overall UA value of 200 watts per kelvin. To cool the building, you install an evaporative cooler that draws heat energy from the building, converts it to the latent heat of evaporation, and releases it to the environment.
If the temperature outside is 90F, what rate of water (ml per hour) is needed to keep the indoor temperature at 70F.
In your solution, write a clear outline of your assumptions and your method.