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 | kgw/kgdry air | 0.0134 | 0.0077 |
| Volume of moist air | m3/kgdry air | 0.8770 | 0.8116 |
| Mass flowrate (dry air) | kgdry air/s | 5.70 | 5.70 |
| Enthalpy of moist air | kJ/kgdry air | 64.35 | 29.35 |
| Enthalpy flow | | 366.89 | 167.34 |
| | | | |
| Amount of condensate removed | kgw/kgdry air | | 0.0057 |
| Condensate flowrate | kgw/s | | 0.0325 |
| Condensate specific enthalpy | kJ/kgw | | 42.01 |
| Condensate enthalpy flow | kJ/s | | 1.37 |
| | | | |
| Referigeration required | kW | | 198.18 |