ROOM AIR CONDITIONING Chapter 8

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ROOM AIR CONDITIONINGChapter 8

• PER OLAF TJELFLAAT
• LARS OLANDER
• ESA SANDBERG
• HANNU KOSKELA
• KIM HAGSTRÖM
• ALEXANDER ZHIVOV
• TIMO HAUTALAMPI
• HÅKON SKISTAD
• RALF WIKSTEN
• MAMDOUH EL HAJ ASSAD

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DGB FUNDAMENTALS, Chapter 8

• INTRODUCTION
• BASIS FOR AIR CONDITIONING DESIGN
• Industrial Process Description
• Requirements for Indoor Environment
• Architectural Design for an Industrial Enclosure
• Worker Involvement in the Production Process
• Load Calculation
• Characterization of Room Airflow and Thermal
  Conditions Based on Industrial Production Process
  and Envelope
• Analyses and Actions to Be Considered Prior to
  Performing Room Air Conditioning Design
• AIR RECIRCULATION
• Introduction
• Different Recirculation Systems

• Central Recirculation System
• Local Recirculation
• Conclusion
• TWO-ZONE MODEL DESCRIPTION
• Zonal Models
• Two-Zone Model
• Two-Zone Model Calculation
• References
• EFFECTIVE AND EFFICIENT VENTILATION
• Ventilation Efficiency Indices
• Contaminant Removal Effectiveness
• Contaminant Removal Efficiency
• Air Exchange Efficiency
• Air Distribution Performance Index References

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DGB FUNDAMENTALS, Chapter 8

• ROOM AIR CONDITIONING STRATEGIES
• Introduction
• Classification for Room Air Conditioning
  Strategies
• Piston Strategy
• Stratification Strategy
• Zoning Strategy
• Mixing Strategy
• Application of the Strategy in System Selection
• Summary
• References
• AIR DISTRIBUTION METHODS AND DIMENSIONING
• Selection of Air Supply Methods and Dimensioning
• Mixing Air Distribution
• Piston Flow
• Displacement Flow

• Zonal Air Distribution
• References
• LOCATION OF GENERAL EXHAUST
• Exhausts in Nonstratified Room Air
• Exhaust of Buoyant Contaminants
• Exhausts in Stratified Room Air
• Location of General Exhaust to Create
  Displacement Flow
• HEATING OF INDUSTRIAL PREMISES
• General
• The Heating Power Demand
• The Heating Energy Demand
• Radiant Heating
• Hot Air Blowers
• Air Jets
• Floor Heating
• References

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INTRODUCTION

• The scope of this chapter is to show how to
  select a strategy and to make calculations to
  provide efficient room air conditioning for an
  industrial enclosure.
• Design examples for simplified scenarios include
  different ways to condition industrial halls.

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BASIS FOR AIR CONDITIONING DESIGN

• Upon starting design for an industrial enclosure,
  expected use should be described by informing and
  questioning the building owner and future users.
• A scenario of the planned industrial enclosure
  should be sketched. The scenario should describe
• The different steps of the flow and batch
  processes of the industrial production.
• Space demands for machinery, tools, working, and
  stocking areas for raw materials and products.
• Demand for worker involvement in each part of the
  industrial process.
• Emission of heat and contaminants from each part
  of the industrial process.
• Environmental requirements for each part of the
  industrial process.
• The factory scenario must be updated with new
  information as the design process evolves.

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Classification for Room Air Conditioning
Strategies

• The aim of room air conditioning is to maintain
  desired conditions, target levels, in the room
  during different operating conditions in the most
  economical way (energy, cost efficiency).
• Depending on the design criteria, the designer
  may choose different strategies in order to
  achieve specified targets.

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FIGURE 8.9 The room air conditioning design and
evaluation process.
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TABLE 8.8 Ideal Room Air Conditioning Strategies
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FIGURE 8.32 The key flow elements in the zoning
strategy.
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FIGURE 8.33 Two-zone temperature model of the
zoning strategy.
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FIGURE 8.34 Two-zone concentration model of the
zoning strategy.