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Exam 21: System Design

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Question 1

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The rate of heat transfer through a material is inversely proportional to its R-Value.

A) True
B) False

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Question 2

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The rate at which heat is transferred from one object to another is determined by the ______________________________ of the material.

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thermal conductivity

Question 3

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The greater the temperature differential the quicker the heat is transferred.

There are two thermal resistance that must be taken into account: ____________________ and ____________________ air film resistance

The smaller the conductivity the fast heat transfer can occur.

The design heating load estimate of a building is an estimate of the rate at which a building loses heat during the near minimum outdoor temperature.

Infiltration losses does not have to be considered when performing a heating load estimate.

Because a structure is made of multiple materials. The ____________________ of each material must be determined and a total R-Value for that portion of the structure computed.

The greater the resistance the slower the rate of heat transfer

Wooden framing members tend to reduce the effective total R-value of a structure.

The ____________________ the air leaks through a building the faster heat is carried away from the structure.

It is only necessary to calculate heat flow through the surfaces that constitute this building envelope.

The thermal resistance of wood is about ____________________ per inch of thickness.

The rate of heat transfer through a given material is indirectly proportional the temperature differential.