ROOM AIR CONDITIONING

8.1 INTRODUCTION

An industrial hall is an indoor space that is enclosed by walls, ceiling, and floor. Such an enclosure is normally perforated by openings for supply and extract of ventilation air, pipes for industrial processes, and operable hatches, windows, and doors for regular or occasional use.

Air conditioning design for an industrial space must be focused on provid­ing a safe and comfortable environment with a low health risk for workers. The main goal for indoor climate design for an industrial hall is that the se­lected solution be effective for workers with respect to air quality and thermal comfort. Thus, prescribed design criteria must be met. Secondly, the climati — zation design should be as energy efficient as possible, which normally in­volves the minimization of outdoor airflow rate use through application of source control, local ventilation, and efficient space ventilation.

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.

Upon starting design for a large enclosure, expected use should be described by informing and questioning the building owner and future users in order to lo­cate zones of occupancy, the related activity level and clothing, and how that is ex­pected to vary over a year. This is also the time to discuss and decide on adequate criteria for acceptable indoor air quality and thermal comfort. National health and building codes and recommendations and international standards apply.

Assumed heat and contaminant emissions inside the room should be esti­mated. Also, contaminants being admitted into the room by airflow and heat ad­mitted by conduction and radiation through the room envelope should be assessed.

In the good tradition of industrial ventilation design, the possibilities of reducing or eliminating emission sources and using local extracts to avoid spreading to the rest of the room should be addressed.

The prevention of unnecessary heat loss or gain, causing poor thermal comfort due to large glazing areas and infiltration, should also be considered.

The use of local climatization should be considered one way of reducing the requirement for heating, cooling, or ventilating the entire enclosure volume.

Posted in INDUSTRIAL VENTILATION DESIGN GUIDEBOOK


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