Objectives

1
Objectives

• Analyze processes in AHU and buildings

2
Single-Zone Systems

• Zone any space with a thermostat

3
Air conditioning
4
Recirculation
5
Reheat
6
Evaporative Cooler
7
Air-to-air heat exchanger
8
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9
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10
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11
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

12
HW2
Problems from the course book 7.1, 7.21, 7.3,
7.4, 7.27, 8.5, 8.17, 8.20

• 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 DBT105 F and RH33
• Winter 22 F and RH80
• 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 F
• b) control only room temperature to 74 F

Due February 23rd