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SherlockOhms
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Homework Statement
A pharmaceutical company operating a tabletting facility in Puerto Rico requires stringent environmental control set at 20°C and 40%RH in order to provide consistent high quality production. The HVAC system is designed to cope with outdoor tropical conditions of 30°C and 90% RH. The tabletting hall is 200[itex]m^3[/itex] and requires 5 changes per hour.
How much water is removed from the air flow per hour?
What is the rating of each of the heat exchangers?
Homework Equations
Use of psychmoetric charts to find absolute humidity.
The Attempt at a Solution
So, to find the mass of water removed from the air flow per hour you find the difference in humidity between the starting and final conditions using the psychometric charts and multiply this found value by the mass flow of air into the room per hour. [itex]Q[/itex] can be found by multiplying the volume of the room, ##V## by the number of changes per hour, 5 to get the volume of air in per hour. Then dividing by the specific volume##\frac{1}{\rho}##, also found via the psychometric chart, we get the mass in per hour, [itex]\dot{m}[/itex]. Multiplying [itex]\dot{m}[/itex] by the difference in humidity gives the mass of moisture removed per hour. Does this sound right? My real question is, having done this, how do I find the heat exchanger rating?