A retail shop located in a city at ( 50^{circ} mathrm{N} ) latitude has the following loads. Outside state: ( 28^{circ} mathrm{C} ) dry-bulb, ( 19.5^{circ} mathrm{C} ) wet-bulb (sling), ( 10.65 mathrm{~g} / mathrm{kg} ). Room state: ( 22^{circ} mathrm{C} ) dry-bulb, ( R H=50 %, 8.366 mathrm{~g} / mathrm{kg} ). Identify the off-coil state ( mathbf{W} ), at ( 11.5^{circ} mathrm{C} ) dry-bulb and ( 7.985 mathrm{~g} / mathrm{kg} ), on the psychrometric chart. Assume a temperature rise of ( 2^{circ} mathrm{C} ) for the supply fan and the duct gain, and ( 1^{circ} mathrm{C} ) for the extract fan. Allow 12 litres ( / s ) of fresh air for each of the two persons assumed to be in a module. Sensible heat gain ( =1250 mathrm{~W} ). Latent heat gain ( =134 mathrm{~W} ) 1. Calculate the sensible heat ratio 2. Determine the supply air temperature 3. Calculate the mass flow rate 4. Calculate the fresh air mass flow rate 5. Calculate the returned air mass flow rate 6. Determine the mixture state, ( mathbf{M} ), which is also the on-coil state,

A retail shop located in a city at 50N latitude has the following loads. Outside state: 28C dry-bulb, 19.5C wet-bulb (sling), 10.65g/kg. Room state: 22C dry-bulb, RH=50%,8.366g/kg. Identify the off-coil state W, at 11.5C dry-bulb and 7.985g/kg, on the psychrometric chart. Assume a temperature rise of 2C for the supply fan and the duct gain, and 1C for the extract fan. Allow 12 litres /s of fresh air for each of the two persons assumed to be in a module. Sensible heat gain =1250W. Latent heat gain =134W 1. Calculate the sensible heat ratio 2. Determine the supply air temperature 3. Calculate the mass flow rate 4. Calculate the fresh air mass flow rate 5. Calculate the returned air mass flow rate 6. Determine the mixture state, M, which is also the on-coil state