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Objectives
• Analyze processes in AHU and buildings
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Single-Zone Systems
• Zone – any space with a thermostat
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Air conditioning
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Recirculation
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Reheat
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Evaporative Cooler
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Air-to-air heat exchanger
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Summary
• Show HVAC processes on a psychrometric chart
• Draw condition lines• Define sensible heat ratio
• Draw HVAC processes for real buildings• Single zone• Multiple zone
• Skipping Chapter 9
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HW2
Problem #9:An office building has:- Sensible load of 91000Btu/h - Latent load of 16000 BTU/h- Required amount of fresh air of 1000CFM- Supply air temperature is 55 F in winter and 93 F in winter. -Outdoor design parameters are :
-Summer: DBT=105 F and RH=33%- Winter: 22 F and RH=80%
-Surface temperature of the cooling coil in AHU is 45 F (when it operates).
Calculate the energy for cooling and heating coils and steam humidifier for winter and summer design condition for CAV system that:a) control the relative humidity to 50% and room temperature to 74 Fb) control only room temperature to 74 F
Problems from the course book: 7.1, 7.21, 7.3, 7.4, 7.27, 8.5, 8.17, 8.20
Due: February 23rd