The Operations Manager of a new Lateral Flow Test manufacturing facility requires a cleanroom for the...
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The Operations Manager of a new Lateral Flow Test manufacturing facility requires a cleanroom for the manufacture and assembly of the product. The design conditions for the room are 20°C dry bulb and 40% relative humidity. The Summer Outdoor Design condition should be based on the ASHRAE 5 Year Return Period Values for design conditions for the nearest weather station, Claremorris (See Appendix A). The User Requirements Specification (URS) states the heat gains in the room will have a maximum value of 15 kW (Latent) and 45kW (Sensible). The system is designed to provide 20% fresh air as part of the supply air. The air supplied to the room when the system is cooling the room can be no lower than 14°C dry bulb. The plant consists, among other components, a mixing box, filters, a chilled-water coil, a reheat coil and a supply fan. The chilled-water cooling coil shall be sized to achieve the required dehumidification. Neglecting temperature changes in the fan and ducting, calculate: Q 1(a) The mass flow rate of supply air necessary Q 1(b) The specific humidity of the supply air Q 1(c) The cooling duty of the cooler Q1(d) The Apparatus Dew Point of the Cooling Coil [7 Marks] [6 Marks] [10 Marks] [5.33 Marks] Q 1(e) The required KW rating of the reheat coil. Note: Use the psychrometric chart assuming the barometric pressure is 1.01325 bar. Use cp for air of 1.02 kJ/kg and density of air of 1.2kg/m³ [5 Marks] The Operations Manager of a new Lateral Flow Test manufacturing facility requires a cleanroom for the manufacture and assembly of the product. The design conditions for the room are 20°C dry bulb and 40% relative humidity. The Summer Outdoor Design condition should be based on the ASHRAE 5 Year Return Period Values for design conditions for the nearest weather station, Claremorris (See Appendix A). The User Requirements Specification (URS) states the heat gains in the room will have a maximum value of 15 kW (Latent) and 45kW (Sensible). The system is designed to provide 20% fresh air as part of the supply air. The air supplied to the room when the system is cooling the room can be no lower than 14°C dry bulb. The plant consists, among other components, a mixing box, filters, a chilled-water coil, a reheat coil and a supply fan. The chilled-water cooling coil shall be sized to achieve the required dehumidification. Neglecting temperature changes in the fan and ducting, calculate: Q 1(a) The mass flow rate of supply air necessary Q 1(b) The specific humidity of the supply air Q 1(c) The cooling duty of the cooler Q1(d) The Apparatus Dew Point of the Cooling Coil [7 Marks] [6 Marks] [10 Marks] [5.33 Marks] Q 1(e) The required KW rating of the reheat coil. Note: Use the psychrometric chart assuming the barometric pressure is 1.01325 bar. Use cp for air of 1.02 kJ/kg and density of air of 1.2kg/m³ [5 Marks]
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Answer rating: 100% (QA)
Q1a To calculate the mass flow rate of supply air necessary we can use the following formula Mass flow rate Cooling load cp x T where cp is the specific heat of air 102 kJkg and T is the temperature d... View the full answer
Related Book For
Operations Management
ISBN: 978-0071091428
4th Canadian edition
Authors: William J Stevenson, Mehran Hojati
Posted Date:
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