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Unit 72
1. Why are heat load calculations necessary?
Heat load calculations are necessary to properly math the equipment capacity to the
building requirement.
2. What is the difference between a shell load study and a room-by-room load study?
Shell Load study is a calculation treating the entire like one big room and room-by-room
study is necessary to properly size the duct system because the duct design is based
on the required heating and cooling load for each room or zone.
3. What advantage is there to doing a room-by-room load study over a shell load
study?
Room-by-room study for heating and cooling load for each room or zone.
4. Why does oversized equipment operate inefficiently?
Oversized equipment operates less efficiently than undersized equipment.
5. What is the difference between heat loss and heat gain?
Heat loss occurs in the winter and heat gain occurs in summer.
6. What is the difference between sensible heat gain and latent heat gain?
Sensible is when an object is heated, the object's temperature. Latent heat is the heat
that results from an increase or decrease in the amount of moisture held by the air.
7. What is the R-value of a material with a thermal conductivity of 2.0 that is 4 in thick?
