Answer:
The volumetric flow rate (V) = 1110.648 cfm
The rate at which heat will be removed is 8929.887 Btu/hr
Step-by-step explanation:
Given that :
the mass of each pig = 50 lb
water vapor production
= 40.2 lbs/hr
Dry bulb temperature of the outside air
= 30° F
Relative humidity of outside air ,
= 50%
Dry bulb of inside air
= 65° F
Relative humidity of inside air
= 70%
Obtaining the following properties of air;
At
= 30° F and
= 50%
Enthalpy
= 9.0429 Btu/lb
Humidity ratio
= 0.00173 lb/lb
Specific volume
= 12.37 ft³/lb
At
= 65° F and
= 70%
= 25.618 Btu/lb
= 0.009192 lb/lb
= 13.41 ft³/lb
The mass balance equation is given as:



5387.291 Btu/hr
where:
= the mass of the dry air
NOW;
Volumetric flow rate (V) =

V = 5387.291 × 12.37
V = 66.460.8496 ft³/hr
V = 1110.648 cfm
B)
The rate at which heat (BTU/hr) will be removed from the building in the ventilation air is determined as follows:


Q = 8929.887 Btu/hr
Thus; the rate at which heat will be removed is 8929.887 Btu/hr