How is a U factor calculated for a building panel built of ...

[xclash]

How is a U factor calculated for a building panel built of several different materials?
 
  A) Add the R values of the different materials and then find the reciprocal.
  B) Take the reciprocal of the lowest R value.
  C) Take the reciprocal of the highest R value.
  D) Average the R values of the different materials and then find the reciprocal.

Question 2

Which of the following statements is TRUE about the economizer?
 
  A) The economizer cools the liquid refrigerant but does not affect the volume of available liquid refrigerant.
  B) The economizer acts as a control valve and separates the liquid cooled and warmed refrigerant.
  C) The economizer provides more cooled liquid refrigerant to the cooler than do systems without an economizer.
  D) The economizer is directly connected to the compressor, so liquid refrigerant that flashes is returned directly to the compressor.

[britb2u]

Answer to Question 1

A

Answer to Question 2

C

[xclash]

Gracias!

[jackie]

Thanks for the timely response, appreciate it