BPI Exam Questions with 100% Correct Answers

Heating Degree Days Correct Answer The number of degrees that a day's average temperature is below 65o Fahrenheit (18o Celsius), which is the temperature below which buildings need to be heated Adding total HDDs or CDDs help us compare heating and cooling requirements for different geographic locations Outdoor Design Temperature Correct Answer The temperature at which an HVAC system is designed to operate and maintain the temperature 99% of the time Cooling Degree Days Correct Answer A cooling degree day (CDD) is a measurement designed to quantify the demand for energy needed to cool a building. It is the number of degrees that a day's average temperature is above 65o Fahrenheit (18o Celsius), which is the temperature above which buildings need to be cooled. Convection Correct Answer The transfer of heat by the movement of a fluid or gas. From one area to another. Energy waste. Due to temperature gradients Conduction Correct Answer Heat transfer through a solid. Most insulations designed to block heat transfer by conduction. Heat tranfers from hot to cold by conduction until equilibrium Radiation Correct Answer The direct transfer of energy by electromagnetic waves without a medium Convective Loops Correct Answer Air on warm side rise, on cool side falls. Interferes with thermal barrier. Occurs in attics, eves cantilever. Relative humidity Correct Answer the percentage of water vapor in the air compared to the maximum amount the air could hold. As the air cools, RH increases. Absolute Humidity Correct Answer The mass of water vapor contained in a certain volume of air Dew Point Correct Answer the temperature at which the water vapor in the air becomes saturated and condensation begins. 100% RH Wet Bulb Temperature Correct Answer The wet-bulb temperature is the temperature read by a thermometer covered in water-soaked cloth over which air is passed. At 100% relative humidity, the wet-bulb temperature is equal to the air temperature and is lower at lower humidity