Objectives Plot processes in AHU and buildings on psychrometric chart Use protractor to calculate SHR

AHU

Sensible heating

Dehumidification by Cooling

Real Dehumidification Process

Humidification hw Specific enthalpy of water added to system hg Specific enthalpy of saturated water vapor

Evaporative Cooling (air washing)

Condition Line for a Space

HVAC Systems Unlimited number You can make your system We will study several most common applied in practice http://www.ce.utexas.edu/prof/Novoselac/classes/ARE389H/Handouts.html

Single-Zone Systems Zone – any space with a thermostat

Air conditioning

Recirculation

Reheat

Evaporative Cooler

Air-to-air heat exchanger

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