Question

The following data is available for the design of air conditioning of a small theatre:
Outdoor design conditions = 34ºC DBT and 70% RH
Comfort conditions required = 22ºC DBT and 50% RH
Total seating capacity = 350 persons
Sensible heat gain per person = 90 W
Latent heat gain per person = 30 W
Sensible heat due to solar gain and
infiltrated air = 46.6 kW
Latent heat gain due to infiltrated air = 23.3 kW
Fresh air supplied = 0.4 m3/min/person
Desirable temperature rise in the theatre = 8ºC
Assume that the recirculated air is mixed with the fresh air after leaving the conditioner. Find:(a) Room
sensible heat factor (b) The percentage of total air circulated : (c) The refrigeration capacity of the conditioner
coil. Assume that the air leaes the conditioner coil with 100% RH

Answer 1

Given: Design of air conditioning of a small theatre:
Outdoor design conditions = 34ºC DBT and 70% RH
Comfort conditions required = 22ºC DBT and 50% RH
Total seating capacity = 350 persons
Sensible heat gain per person = 90 W
Latent heat gain per person = 30 W
Sensible heat due to solar gain and
infiltrated air = 46.6 kW
Latent heat gain due to infiltrated air = 23.3 kW
Fresh air supplied = 0.4 m³/min/person
Desirable temperature rise in the theatre = 8ºC
Assume that the recirculated air is mixed with the fresh air after leaving the conditioner.

Assume that the air leaves the conditioner coil with 100% RH

To find:

(a) Room sensible heat factor

(b) The percentage of total air circulated

(c) The refrigeration capacity of the conditioner coil.

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