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Examples

MoistAirTab™ Example 4 - Cooling

Example 4

Moist air at 30°C dry-bulb temperature and 50% relative humidity enters a cooling coil at 5 m³/s and is processed to a final saturation condition at 10°C. Find the kW of refrigeration required.

Solution

The solution is presented below as a table generated from Excel. The gray shaded areas represent the input data.

Soution:	Units	Inlet	Outlet
Total pressure	bar	1.01325	1.01325
Dry bulb temperature	°C	30	10.00
Relative humidity	%	50%	100%
Volume flow rate	m3/s	5.00
Wet bulb temperature	°C	22.00	10.00

Humidity ratio	kg_w/kg_{dry air}	0.0134	0.0077
Volume of moist air	m³/kg_{dry air}	0.8770	0.8116
Mass flowrate (dry air)	kg_{dry air}/s	5.70	5.70
Enthalpy of moist air	kJ/kg_{dry air}	64.35	29.35
Enthalpy flow		366.89	167.34

Amount of condensate removed	kg_w/kg_{dry air}		0.0057
Condensate flowrate	kg_w/s		0.0325
Condensate specific enthalpy	kJ/kg_w		42.01
Condensate enthalpy flow	kJ/s		1.37

Referigeration required	kW		198.18

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MoistAirTab™ Example 4 - Cooling

Example 4

Solution