QUESTION $2[44]$

The air in a conference room located at an altitude of $1700$ m is to be air conditioned using two

cooling coils and a humidifier. The air in the rest room is to be maintained at a temperature of

$24C$ and a relative humidity of $40\%.$ The temperature of the outside air is $32C$ at its relative

humidity is $55\%.$ The mixture flows into the first cooling coil which has a dew point

temperature of $9C.$ The bypass factor for the first coil is $50\%.$ The mixture then flows to the

second coil which has a dew point of $3C.$ The dry bulb temperature of the mixture leaving the

second coil is $7C.$ The ratio of outside air to inside air is $0\mathrm{.}28125,$ and the total supply volume air

flow is $10\mathrm{.}25\frac{m^3}{s}.$ The latent heat load in the room is $50$ kW $.$

$2\mathrm{.}1$ Plot the process on a psychrometric chart $($submit this with your calculations$)$

$2\mathrm{.}2$ By calculation, determine the dry bulb temperature and humidity ratio of the mixture and

check the properties on a psychrometric chart

$2\mathrm{.}3$ By calculation, determine the temperature of the mixture leaving the first cooling coil

$2\mathrm{.}4$ By calculation, determine the bypass ratio of the second coil

$2\mathrm{.}5$ Calculate the cooling capacity of the first coil

$2\mathrm{.}6$ Calculate the cooling capacity of the second coil

$2\mathrm{.}7$ Calculate the room sensible heat factor

$2\mathrm{.}8$ Determine the humidifier load, and the rate at which water is added in the humidifier.