Microsoft Word - Assignment 2.1 & 2.2_ psychrometric.docx Assignment 2 ENS5200 Building Services ECU semester 2 2018 2.1 2400L/s outside air is mixed with 17600L/s of return air. This air is then...

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Microsoft Word - Assignment 2.1 & 2.2_ psychrometric.docx Assignment 2 ENS5200 Building Services ECU semester 2 2018 2.1 2400L/s outside air is mixed with 17600L/s of return air. This air is then passes through a return air fan with a 15kW motor. a) Calculate the condition of the air as it leaves the return air fan to enter the cooling coil. b) Calculate the sensible, latent and total heat removed from the air if, the air property of the air leaving the cooling coil is 13oC DB, 12oC WB. c) Calculate the mass flow rate at b). Given:  Outside air: 35oC DB, 26oC WB  Return air : 24oC DB, 17.6oC WB d) Show the outside air temp (1), return air temp (2), mixed air temp (3), leaving coil temp (4) on a psychrometric chart. Assignment 2 ENS5200 Building Services ECU semester 2 2018 2.2 calculate the sensible and latent heat, total heat and air flow required of a 30m2 board room with 25 people around the table. a) What is your recommended ducted AC unit if you are asked to select a Daikin reverse cycle fan coil unit model (indoor and outdoor) unit? b) What is your recommended AC unit total cooling load, heating load, air flow and recommended static pressure? Consider the following (using AIRAH handbook recommended value):  Perth weather condition,  24oC & 50% RH in board room,  People activity: office type work,  Projector heat gain: 200W,  Computer 2 off: 150W/computer,  15W/m2 sensible heat load,  Kettle: 1 off 1400W sensible, 600W latent.  Outside air requirement: 10L/s/ person.  The external heat through the walls and façade glazing is provided by base building air conditioning.