MCC HVAC MIDTERM EXAM 100% GRADED AND CORRECT!

List at least five factors that must be controlled if a comfortable indoor environment is to be maintained. -ANSWERThe factors that must be controlled include temperature, humidity, air motion, dust, bacteria, odors, toxic gases, and ionization. ((Ref: 1/1)) Describe in simple terms the basic process by which a refrigerant transfers heat energy. -ANSWERA refrigerant is used to transfer heat when it changes states. When liquid refrigerant evaporates into a vapor, heat is absorbed by the vapor. When refrigerant vapor is condensed into a liquid, heat is rejected from the refrigerant. ((Ref: 2/3)) In your own words, state the first law of thermodynamics. -ANSWEREnergy can neither be created nor destroyed, but can be changed from one form into another. ((Ref: 3/2)) Define work. -ANSWERA force moving an object in the direction of the force. ((Ref: 3/3))