1999 ASHRAE Handbook Preface by PDF

ISBN-10: 1883413710

ISBN-13: 9781883413712

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Perimeter radiant ceiling heaters have been successfully applied to exhibition halls with large expanses of glass. Smaller meeting rooms are best conditioned with either individual room air handlers, or with variable volume central systems, because these rooms have high individual peak loads but are not used frequently. Constant volume systems of the dual- or singleduct reheat type waste considerable energy when serving empty rooms, unless special design features are incorporated. Offices and restaurants often operate for many more hours than the meeting areas or exhibition areas and should be served separately.

The floor insulation also must be strong enough to take this load. Ice-melting pits of sufficient size with steam pipes may have to be furnished. If the arena is to be air conditioned, the possibility of combining the air-conditioning system with the ice rink system may be analyzed. The designer should be aware that both systems operate at vastly different temperatures and may operate at different capacity levels at any given time. The radiant effects of the ice on the people and of the heat from the roof and lights on the ice must be considered in the design and operation of the system.

Servicing is simple— a defective machine is replaced by a spare chassis and forwarded to a service organization for repair. Thus, building maintenance requires relatively unskilled personnel. Noise levels are generally no higher than NC 40, but some units are noisier than others. Installations near a seacoast should be specially constructed (usually with stainless steel or special coatings) to avoid the accelerated corrosion to aluminum and steel components caused by salt. In high-rise buildings of more than 12 stories, special care is required, both in the design and construction of outside partitions and in the installation of air conditioners, to avoid operating problems associated with leakage (caused by stack effect) around and through the machines.

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1999 ASHRAE Handbook Preface

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