Room Air Conditioning

Department of Refrigeration and Air Conditioning, NTNU, Norweigen University for Science and Technology, Trondheim, Norway 

Building Services Engineering KTH, Royal Institute of Technology, Stockholm, Sweden 

Turku Regional Institute of Occupational Health, Turku, Finland 

Faculty of Mechanical Engineering, Helsinki University of Technology, Espoo, Finland 

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This chapter describes the room air conditioning process, including the interaction of different flow elements room air distribution, heating and cooling methods, process sources, and disturbances. Air handling equipment, including toom air heaters, is discussed in the form of black boxes as far as possible. 

Room air conditioning (see Fig. 2.1) systems are used to control the main controlled zone. Systems can be divided into subsystems, e.g. ... 

A detailed description of the methods for room air conditioning is presented in Chapter 8. Table 2.1 summarizes the strategies. 

In Chapter 2, Terminology, the terminology of zones, systems, and basic strategies for room air conditioning are explained. 

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. 

Analyses and Actions to Be Considered Prior to Performing Room Air Conditioning Design... 

Zonal models can be applied for each room air conditioning strategy (see Section 8.6), but they are mostly used in stratification and zoning strategies with different air distribution methods (see Section 8.7). 

A characteristic of many industrial halls is that zones of occupancy take up only a small portion of the room volume and height. In addition, the flows are normally buoyancy dominated. This results in a vertical temperature stratification that can be utilized for room air conditioning design in order to achieve effective climatization along with low energy consumption. 

This chapter describes a strategy approach for room air conditioning based on the classification and terminology presented by Hagstrom et al. The basis... 

FIGURE 8.9 The room air conditioning design and evaiuation process. 

Srratification is a desirable strategy to provide efficient room air condi-noning with much less effort than using the piston strategy. Its mam application in room air conditioning is the thermal replacement method. However, it can also be applied for contaminants without any thermal buoyancy sources that have different density from the room air. Examples of different air distribution methods to create thetma teplacement are presented in Fig. 8.12. 

The clarification of the room air conditioning strategies and their separation frtim the practical methods at present creates space for creativity and new innovations and their evaluation. 

These case examples illustrate the dependence of the stratification of temperature and contaminants on several parameters, which in some cases increase and in other cases decrease the effectiveness. Al the parameters should be included in calculations when designing the system combination of the room air conditioning methods. 

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