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

Q = R × A × TD

Answer

Q = U × A / TD

Answer

Q = R / (A × TD)

Question 2

What does the R-value of insulation represent?

Accepted Answer

The resistance to heat flow per unit of insulation thickness

Answer

The refrigerant type recommended for the application

Answer

The rated cooling capacity of the system in BTU/hr

Answer

The reflectivity of the insulation surface

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

The color of the door

Answer

The material of the door handle

Answer

The hinge type used on the door

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

Temperature difference between inside and outside air

Answer

The velocity of air movement through the door opening

Answer

Radiation heat transfer from the warm exterior

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

To determine the outdoor ambient design condition

Answer

To select the refrigerant operating pressure

Answer

To calculate the compressor discharge temperature

Question 6

For a low-temperature freezer application, how does required insulation thickness compare to a medium-temperature cooler operating at the same outdoor conditions?

Accepted Answer

Freezer insulation is thicker due to the greater temperature differential

Answer

Freezer insulation is thinner because colder refrigerants are more efficient

Answer

Both require the same insulation thickness

Answer

Freezer insulation is thinner because the doors are opened less often

Question 7

Which condition typically represents the peak (design) load for a refrigeration system?

Accepted Answer

Maximum outdoor temperature combined with heaviest expected product load

Answer

Minimum outdoor temperature in winter with no product movement

Answer

Average annual temperature at the location with average daily door openings

Answer

Nighttime operation when ambient temperature is lowest