Kaplan- Lesson 3: Basic Thermal Processes

Question 1

When transferred heat causes a change in temperature it is called _____.

Answer 1

Sensible heat

Question 2

When heat causes a change of state (ice to water or water to vapor) it is called _____.

Answer 2

Latent heat

Question 3

What is a British Thermal Unit (BTU)?

Answer 3

The amount of heat energy required to raise one pound of water by 1 degree Fahrenheit.

Question 4

What is radiation?

Answer 4

The transfer of heat between two objects not in contact.

Question 5

What is convection?

Answer 5

The heat exchange process that occurs only in a fluid medium, such as air or a liquid.

Question 6

What is conduction?

Answer 6

The heat transfer process that occurs when objects are in direct contact.

Question 7

What is a degree day?

Answer 7

A measure of how cold it has been at a given place over a given period of time.

One degree day is defined as a day whose mean temp. is one degree below the reference temperature of 65 degrees Fahrenheit.

Question 8

A day colder than 98% of the days experienced in that climate is called at _____.

Answer 8

Design Day

Question 9

The amount of air infiltration in a building may be determined using what two methods?

Answer 9

Air Change Method and Crack Method.

Question 10

A human generates how many Btuh (BTU’s per hour) at rest?

And when engaged in heavy work or athletic activity?

Answer 10

450 Btuh

2,500 Btuh

Question 11

Insolation is an example of

A. radiation
B. conduction
C. convection
D. latent heat transfer

Answer 11

A. radiation

Question 12

Which of the following is dependent on orientation?

A. radiation
B. conduction
C. convection
D. latent heat transfer

Answer 12

C. convection

Question 13

The mean radiant temperature relates to

A. air temperature.
B. surrounding surface temperatures.
C. body temperature.
D. all of the above.

Answer 13

B. surrounding surface temperatures.

Question 14

CLTD (Cooling Load Temperature Differential) approximates the effects of which of the following?

I. Radiation
II. Conduction
III. Convection
IV. Latent Heat

A. I & II
B. II & III
C. III & IV
D. I & III

Answer 14

A. I & II

Radiation & Conduction

Question 15

The resistance of a layer of construction in a wall relates to which of the following?

I. The temperature gradient within the wall
II. The conduction through the wall
III. The conductivity of the material composing the layer

A. I only
B. II only
C. III only
D. I, II, & III

Answer 15

D. I, II, & III

Question 16

A degree day is directly related to

I. the weather in the area over a period of time.
II. a reference temperature.
III. a design day.

A. III only
B. II & III
C. I & II
D. I & III

Answer 16

C. I & II

the weather in the area over a period of time and a reference temperature.

Question 17

Infiltration is calculated using which method(s)?

I. Design Day method
II. Air change method
III. Crack method

A. I only
B. II only
C. III only
D. II & III

Answer 17

D. II & III

Air change method & Crack method

Question 18

Using the design day temperatures in the qc formula gives us information for which of the following?

A. equipment sizing
B. Life cycle costing
C. Late heat values
D. Yearly weather versus a reference temperature

Answer 18

A. equipment sizing