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(Solved): FT0718 B1. An office in Hong Kong is conditioned by an all-air air-conditioning system with the foll ...



FT0718 B1. An office in Hong Kong is conditioned by an all-air air-conditioning system with the following operating characteristics at summer design conditions: Outdoor air dry bulb temperature Outdoor air relative humidity Indoor air dry bulb temperature Indoor air relative humidity Sensible heat ratio (SHR) Space sensible load 33 °C 80% 25.5 °C 60% 0.8 128 kW Relative humidity of air at off-coil condition Outdoor air supply Supply and return system heat gains With the aid of a psychrometric chart, determine: (a) the conditions (specific enthalpy and dry bulb temperature) of supply air to the office; (4 Marks) (b) the supply air volume flow rate to the office; (4 Marks) (c) the cooling coil's load; and (7 Marks) (d) suggest a control strategy/method to save energy for year-round operation of the air-conditioning system in this office. (5 Marks) 90% 5.5 m³/s Neglected

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An office in Hong Kong is conditioned by an all-air air-conditioning system with the following operating characteristics at summer design conditions: With the aid of a psychrometric chart, determine: (a) the conditions (specific enthalpy and dry bulb temperature) of supply air to the office; (4 Marks) (b) the supply air volume flow rate to the office; (4 Marks) (c) the cooling coil's load; and (7 Marks) (d) suggest a control strategy/method to save energy for year-round operation of the air-conditioning system in this office. (5 Marks)


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