Outdoor air conditions are: 28°C db, 19.5°C wb Return air conditions are: 22°C db, 50% RH. The mixture air condition outlet the cooling coil are: 10°C db, 0.00735 kg/kgda Draw the system on the Psychrometric chart, then calculate: 1. Cooling coil load. 2. Room sensible heat. 3. Room latent heat. 4. Fresh (outdoor) load. 5. Duct and fan heat gain 6. Sensible heat ratio SHR. If the supply air temperature increases with a value 1ºK due to fan motor heat gain and 2ºK due to duct heat gain.

Outdoor air conditions are: 28°C db, 19.5°C wb Return air conditions are: 22°C db, 50% RH. The mixture air condition outlet the cooling coil are: 10°C db, 0.00735 kg/kgda Draw the system on the Psychrometric chart, then calculate: 1. Cooling coil load. 2. Room sensible heat. 3. Room latent heat. 4. Fresh (outdoor) load. 5. Duct and fan heat gain 6. Sensible heat ratio SHR. If the supply air temperature increases with a value 1ºK due to fan motor heat gain and 2ºK due to duct heat gain.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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• Question #) • An office is to be maintained at 22°C dbt and 50% Rh in summer. The sensible heat gain is 8 kW and the latent heat gain is 2 kW. The outdoor air condition is 28°C dbt and 80% Rh. The outdoor and return air ratio is 20% / 80%. The apparatus dew point temperature is 8°C and cooling coil contact factor is 0.8. The plant consists of cooling coil and reheater as shown in Figure below. COOLING REHEATER COIL DAMPER SUPPLY FAN BATTERY Sensible Gain = 8 kW ADP Latent Gain = 2 kW 20% FRESH AIR M SUFPLY AIR ROOM 80% RECIRC EXHAUST AIR OUTLET R R ROOM AIR ROOM AIR RETURN AIR FAN a)- Draw the plant psychometric cycle on the chart b)- Determine the mixing point properties (dbt and Rh) c)- Calculate the supply air flow rate (kg/s) d)- Calculate the reheater coil capacity (kW) d)- Calculate the cooling coil capacity (kW)
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notes : 1- Solve in British International Units, not in American units 2- Use operations and psychrometry in the solution as well
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