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Author Question: Given the following readings from an electric furnace, use the formula to calculate airflow. CFM ... (Read 82 times)

ssal

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on: Jul 27, 2018
Given the following readings from an electric furnace, use the formula to calculate airflow.
 
  CFM =
 
  What is the airflow in CFM and does this furnace have the recommended air flow?
 
  Voltage at strips 240 V
  Amp draw of strips 22.6 A
  Return-air temperature 65 F
  Supply-air temperature 120 F
 
  A) The air flow is 312 CFM; No, the air flow is too low.
  B) The airflow is 336 CFM; No, the air flow is too low.
  C) The air flow is 312 CFM; Yes, the air flow is at the recommended level.
  D) The airflow is 336 CFM; Yes, the air flow is at the recommended level.

Question 2

Some water source heat pumps contain a separate coaxial coil for heating domestic hot water. The heat for the domestic hot water comes from
 
  A) a submersion style electric heater
  B) subcooling the liquid leaving the condenser
  C) de-superheating the hot gas leaving the compressor
  D) using the water heating coil instead of the loop in cooling


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daiying98

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Reply #1 on: Jul 27, 2018
Answer to Question 1

C

Answer to Question 2

C


ssal

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Reply #2 on: Jul 27, 2018
TY


daiying98

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Reply #3 on: Jul 27, 2018
You're welcome


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