Selection method of cabinet air conditioning

How to choose suitable cabinet air conditioning, the formula is as follows

Q t is equal to Q I plus Q r

Q t: total heat generated by the cabinet (unit: W)

Q I: total heat generated in the cabinet (unit: W)

Q r: heat transferred from the cabinet to the cabinet (unit: W)

Q r = k * A * Δ T k: coefficient of heat transfer

1), k= 5.5w/m. k steel cabinet

2), k= 12.0w/m 2. K aluminum magnesium alloy material cabinet

3), k= 0.2w/m 2.K plastic material cabinet

A: surface area of the cabinet (unit: m 2)

Δ 1-2 T T = T (unit: ℃)

T 1: highest temperature outside the cabinet T 2: temperature control inside the cabinet