Chapter 3. Air-Conditioning Systems
3.1 Introduction
3.2 Automatic control systems
3.3 All-air systems
3.4 Air-water systems
3.5 All-water systems
3.6 Unitary and hybrid systems
3.7 Summary of different air-conditioning systems
Reading: Chapter 2 of the text book (M&P)抄送英文
ASHRAE Systems & Equipment Handbook, ASHRAE Applications Handbook
Kreider J.F, and Rabl A. “Heating and Cooling of Buildings – Design for Efficiency” 3.1 Introduction
Purpo of an air-conditioning system is to control indoor air parameters within required thermal comfort and indoor air quality. To achieve required indoor air parameters, the system: heat, cool, humidify, dehumidify and filter outdoor air.
HVAC Subsystems
See Figure on the next page:
End U
the bird and the beeConsumes capacity to condition space air or air stream supplying space.
Air-conditioning systems = air handling systems + ducts + air distribution devices
How to lect an air-conditioning system?
• Performance requirements (loads, process)
• Capacity requirements (building types, loads)
• Spatial requirements (building types)
• First costs (location, size of HVAC, investment)
• Operating costs
• Reliability
• Flexibility
• Maintainability
介词
Classification in terms of system:
dhcp是什么意思Classification in terms of air supplied
Classification in terms of load carried:
All-air All-water Air-water
Refrigerant
chace crawford教师节快乐英文Production
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Convert primary energy for heating/cooling. Energy sources:
• Coal
• Natural gas
• Fuel oil
• Biomass Produce steam and electricity.
canada dayHeating production equipment:
A packed fire-tube boiler. (Courtesy of Federal Corp., Oklahoma City, OK )
Cooling production equipment:
Vapor compressor:
• Refrigerant
• Compressor
• Drive (usually electric motor)
Centrifugal chiller cutaway drawing (Courtesy United Technology / Carrier) Heat rejection:
• Dispos of heat from cooling process
• Cooling tower, evaporative condenr, air-cooled condenr
yukuo• “Sink” for waste heat: ambient dry bulb, ambient wet bulb, ground, surface water • Trades offs between cost and COP
无忧雅思预测Forced-draft cooling tower (Courtesy Marley Co.)
Distribution
