Question

The design data for an air-conditioning plant of a restaurant is given below

Outdoor design conditions = 35ºC DBT and 24ºC WBT

Indoor design conditions = 27ºC DBT and 55% RH

Seating capacity of the restaurant = 50

Latent heat gain per person = 44 W

Latent heat gain from meals per person = 6 W

Sensible heat gain per person =58 W

Sensible heat gain from meals per person = 3.5 W

Number of service employees = 5

Latent heat gain per employee = 75 W

Sensible heat gain per employee = 58 W

Sensible heat gain from outside = 8.14 kW

Sensible heat gain from inside equipment = 2.9 kW

Latent heat gain from inside equipment = 0.7 kW

Rate of infiltrated air = 400 m3 / h

Rate of fresh air supply = 1600 m3 / h

Minimum temperature of air supplied to room = 17ºC DBT

The fan is situated before the conditioner and has a motor of 11 kW. Calculate (a) volume of air passing

through the room in m3 / h (b) percentage of recirculated air; (c) apparatus dew point temperature and by-pass

Answer 1

Please refer the following images for the solution.