Delta T

Question 1

How do you confirm the proper heat transfer at the indoor coil?

Answer 1

By measuring the Delta T

Question 2

What is Delta T?

Answer 2

Delta T is the temp decrease of the air moving across the evaporator coil (indoor coil)

Question 3

How do you measure Delta T?

Answer 3

This is measured in the return and supply ducts within a few feet of the evaporator coil

Question 4

A single speed air conditioning system with a correct refrigerant charge, correct airflow, and a TXV should have a Delta T of what?

Answer 4

Roughly 18°-21°

Question 5

What is the Delta T equation?

Answer 5

(T1) - (T2) = Delta T

Question 6

How do you get the two measurements in the Delta T equation?

Answer 6

1. ) First measurement is the higher temp reading taken a few feet up from the evaporator coil in the return duct (T1)
2. ) The lower temperature reading taken a few feet down from the evaporator coil in the supply duct (T2)

Question 7

If the airflow is to low then the Delta T would be?

Answer 7

The Delta T would be high

Question 8

If the airflow is to high then the Delta t would be what?

Answer 8

The Delta T would be low

Question 9

The Delta T should usually be attainable unless?

Answer 9

Unless there is very high humidity in the conditioned air within the building.