# Adequate levels of ventilation reduce the likelihood of

## Problem 12.13D Chapter 12

Fundamentals of Engineering Thermodynamics | 8th Edition

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Fundamentals of Engineering Thermodynamics | 8th Edition

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Problem 12.13D

Adequate levels of ventilation reduce the likelihood of sick building syndrome. (See BIOCONNECTIONS on p. 753.) The outdoor air used for ventilation must beconditioned, and this requires energy. Consider the airhandlingsystem for the commercial building illustrated inFig. P12.13D, consisting of ducting, two dampers labeled Aand B, a vapor-compression dehumidifier, and a heater. Thesystem supplies 25 m3/s of conditioned air at 208C and arelative humidity of 55% to maintain the interior space at258C and a relative humidity of 50%. The recirculated airhas the same conditions as the air in the interior space. Aminimum of 5 m3/s of outdoor air is required to provideadequate ventilation. Dampers A and B can be set toprovide alternative operating modes to maintain requiredventilation rates. On a given summer day when the outsideair dry-bulb temperature and relative humidity are 258Cand 60%, respectively, which of the following threeoperating modes is best from the standpoint of minimizingthe total heat transfer of energy from the conditioned airto the cooling coil and to the conditioned air from theheating coil?1. Dampers A and B closed.2. Damper A open and damper B closed with outside aircontributing one-quarter of the total supply air.3. Dampers A and B open. One-quarter of the conditionedair comes from outside air and one-third of the recirculatedair bypasses the dehumidifier via open damper B; the restflows through damper A. Present your recommendation together with your reasoningin a PowerPoint presentation suitable for your class.Additionally, in an accompanying memorandum, providewell-documented sample calculations in support of yourrecommendation.

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RESPIRATORY PHYSIOLOGY  Example exam question: You’re driving your horse to a race, and there is a hole in the trailer near the exhaust pipe. By the time you get to the horse race, you open the door and what happens (There will be a wreck and the horse will bleed out, this will involve the cardiovascular system) o The horse falls out dead.  The...

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