RSES System Design & Load Calculation 2

Question 1

Which formula correctly represents the heat transmission through an insulated panel?

Accepted Answer

Q = U × A × TD

Answer

Heat transmission is calculated as Q = U × A × TD, where U is the overall heat transfer coefficient, A is the surface area, and TD is the temperature difference.

Question 2

What does the R-value of insulation represent?

Accepted Answer

The resistance to heat flow per unit of insulation thickness

Answer

R-value measures thermal resistance; a higher R-value means the insulation resists heat flow more effectively, reducing the transmission load.

Question 3

When calculating infiltration load for a walk-in cooler, which factor has the greatest impact on the amount of heat entering through door openings?

Accepted Answer

The frequency and duration of door openings

Answer

Infiltration load is directly proportional to how often doors are opened and for how long, since warm outside air replaces the cold interior air each time.

Question 4

In a refrigeration load calculation, what is the latent component of infiltration load caused by?

Accepted Answer

Moisture in the warm outside air that condenses or freezes inside

Answer

Latent infiltration load results from the moisture carried by warmer incoming air, which must be condensed and its latent heat of condensation removed by the refrigeration system.

Question 5

What is the design temperature difference (TD) used for in evaporator coil selection?

Accepted Answer

To size the evaporator coil capacity relative to the refrigerant evaporating temperature

Answer

TD is the difference between the room air temperature and the refrigerant evaporating temperature, and it directly determines the evaporator coil size needed to handle the load.

(RSES) Refrigeration Service Engineers Society Certification Practice Test

(RSES) Refrigeration Service Engineers Society Certification Practice Test

RSES System Design & Load Calculation 2