Heat and Human Comfort
HVAC
CNST 305 Environmental Systems 1Dr. Berryman
5b HVAC Introduction, Human Comfort
4.39 Building Codes and Standards (3 hr)
Heat Simple molecular motion
• •
Heat Exchange
Principles of Heat Transfer
Methods of Heat Transfer
hotwater
hotwater
cool aircool air
warm airwarm air
60°F60°F 61°F61°F
15°C15°C 16°C16°C
1 Btu1 Btu
1 kcal1 kcal[4.19 kJ][4.19 kJ]
1 lb1 lbwaterwater
1 kg1 kgwaterwater
Measuring Heat Quantity
Sensible versus Latent Heat
60°F60°F[15.6°C][15.6°C]
212°F212°F[100°C][100°C]
212°F212°F[100°C][100°C]
212°F212°F[100°C][100°C]
sensible heatsensible heat
latent heatlatent heat
Radiant Heat Infrared radiation
• • •
Examples of Heat Sources Computer Light fixtures Coffee pot Sun People
Heat Generated by People
Surrounding Air Conditions
What makes the body feel comfortable?
Factors Affecting Human Comfort
Next Time The Study of Air/Water Mixtures Reading Assignment
Chapter 2 (Toa)