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builders schools, hospitals, government and owners who expect to occupy the building for an inde nite extended period Life-cycle cost analysis requires the assumption of an interest, or discount, rate and may also include anticipated in ation 4 Desires of owner, architect, or design of ce Very often, someone in authority lays down guidelines which must be followed by the designer This is particularly true for institutional owners and major retailers Here the designer s job is to follow the criteria of the employer or the client unless it is obvious that some requirements are unsuitable in an unusual environment Examples of such environmental conditions are extremely high or low outside-air humidity, high altitude (which affects the AHU and air-cooled condenser capacity), and contaminated outside air (which may require special ltration and treatment) 5 Space limitations Architects can in uence the HVAC system selection by the space they make available in a new building In retro t situations, designers must work with existing space Sometimes in existing buildings it is necessary to take additional space to provide a suitable HVAC system For example, in adding air conditioning to a school, it is often necessary to convert a classroom to an equipment room Rooftop systems are another alternative where space is limited, if the building structure will support such systems In new buildings, if space is too restricted, it is desirable to discuss the implications of the space limitations in terms of equipment ef ciency and maintainability with the architect There are ways of providing a functional HVAC system in very little space, such as individual room units and rooftop units, but these systems often have a high life-cycle cost 6 Maintainability This criterion includes equipment quality (the mean time between failures is commonly used); ease of maintenance (are high-maintenance items readily accessible in the unit ); and accessibility (Is the unit readily accessible Is there adequate space around it for removing and replacing items ) Rooftop units may be readily accessible if an inside stair and a roof penthouse exist; but if an outside ladder must be climbed, the adjective readily must be deleted Many equipment rooms are easy to get to but are too small for adequate access or maintenance This criterion is critical in the lifecycle cost analysis and in the long-term satisfaction of the building owner and occupants 7 Central plant versus distributed systems Central plants may include only a chilled water source, both heating and chilled water, an intermediate temperature water supply for individual room heat pumps, or even a large, central air-handling system Many buildings have no central plant This decision is, in part, in uenced by previously cited criteria and is itself a factor in the life-cycle cost analysis
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In general, central plant equipment has a longer life than packaged equipment and can be operated more ef ciently The disadvantages include the cost of pumping and piping or, for the central AHU, longer duct systems and more fan horsepower There is no simple answer to this choice Each building must be evaluated separately 8 Simplicity and controllability Although listed last, this is the most important criterion in terms of how the system will really work There is an accepted truism that operators will soon reduce the HVAC system and controls to their level of understanding This is not to criticize the operator, who may have had little or no instruction about the system It is simply a fact of life The designer who wants or needs to use a complex system must provide for adequate training and retraining for operators The best rule is: Never add an unnecessary complication to the system or its controls 43 Options in System and Equipment Selection Many of the various systems and equipment available are described in later chapters They are brie y listed here to summarize the options available to the designer
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