The following air streams mix in a building’s HVAC system upstream of the HVAC heating unit: 1,600 CFM outdoor air at 35°F and 70% RH mixes with 3,500 CFM of return air at 70°F and 40% RH. Assume the HVAC runs for 1 minute, so CFM is the same as cubic feet. a) What are the temperature and RH of the combined air stream? b) How much energy (units of BTU) does the HVAC heating unit need to add to the combined air stream to condition it to 80°F and 60% RH? c) If the conditioned air stream from the heating unit then mixes with 28,000 CFM of air at 70°F and 40% RH provided to the building from another source, what are the combined temperature and RH of the air in the building?
The following air streams mix in a building’s HVAC system upstream of the HVAC heating unit: 1,600 CFM outdoor air at 35°F and 70% RH mixes with 3,500 CFM of return air at 70°F and 40% RH. Assume the HVAC runs for 1 minute, so CFM is the same as cubic feet. a) What are the temperature and RH of the combined air stream? b) How much energy (units of BTU) does the HVAC heating unit need to add to the combined air stream to condition it to 80°F and 60% RH? c) If the conditioned air stream from the heating unit then mixes with 28,000 CFM of air at 70°F and 40% RH provided to the building from another source, what are the combined temperature and RH of the air in the building?
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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The following air streams mix in a building’s HVAC system upstream of the HVAC heating unit: 1,600 CFM outdoor air at 35°F and 70% RH mixes with 3,500 CFM of return air at 70°F and 40% RH. Assume the HVAC runs for 1 minute, so CFM is the same as cubic feet.
a) What are the temperature and RH of the combined air stream?
b) How much energy (units of BTU) does the HVAC heating unit need to add to the combined air stream to condition it to 80°F and 60% RH?
c) If the conditioned air stream from the heating unit then mixes with 28,000 CFM of air at 70°F and 40% RH provided to the building from another source, what are the combined temperature and RH of the air in the building?
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