Inlet Air 100 °F, 14.5 psia, Ø = 50% Outlet Air T = ?, 14.5 psia, Water Pool Ø = 100%, 800,000 ft/min T=T2 Qout R134a Condenser R-134a R-134a (to throttle/expander) (from compressor)
Evaporative cooling
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In the diagram below inlet air is drawn over a pool of liquid water in a steady-state, steady-flow isobaric process. Evaporation on the pool results
in saturated air at the exit. The pool of liquid water is assumed to be at the same temperature as the exit
air. Discharge fans at the exit provide a volumetric flow rate of 800,000 ft3/min.
In the diagram above inlet air is drawn over a pool of liquid water in a steady-state, steady-flow isobaric process. Evaporation on the pool results
in saturated air at the exit. The pool of liquid water is assumed to be at the same temperature as the exit
air. Discharge fans at the exit provide a volumetric flow rate of 800,000 ft^3/min.
Problem #1: Assume that the exit temperature is T2 = 90 °F. For this model of the system and from the
data provided determine:
a) The mass flow rate dry air through the system (lbm/sec).
b) The rate of heat that is output from the R-134a condenser Qout (tons of cooling).
c) The rate of liquid water resupply required for continuous operation (lbm/hour).
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