Kaplan- Lesson 3: Basic Thermal Processes Flashcards

1
Q

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

A

Sensible heat

2
Q

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

A

Latent heat

3
Q

What is a British Thermal Unit (BTU)?

A

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

4
Q

A

The transfer of heat between two objects not in contact.

5
Q

What is convection?

A

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

6
Q

What is conduction?

A

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

7
Q

What is a degree day?

A

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.

8
Q

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

A

Design Day

9
Q

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

A

Air Change Method and Crack Method.

10
Q

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

And when engaged in heavy work or athletic activity?

A

450 Btuh

2,500 Btuh

11
Q

Insolation is an example of

B. conduction
C. convection
D. latent heat transfer

A

12
Q

Which of the following is dependent on orientation?

B. conduction
C. convection
D. latent heat transfer

A

C. convection

13
Q

The mean radiant temperature relates to

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

A

B. surrounding surface temperatures.

14
Q

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

II. Conduction
III. Convection
IV. Latent Heat

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

A

A. I & II

15
Q

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

A

D. I, II, & III

16
Q

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

A

C. I & II

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

17
Q

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

A

D. II & III

Air change method & Crack method

18
Q

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

A

A. equipment sizing