Download Air Conditioning System Design Manual, Second Edition by ASHRAE Press PDF

By ASHRAE Press

The air con guide used to be written to help entry-level engineers within the layout of air-conditioning structures. it's also suable - in conjuction with basic HVAC&R resourcee fabric - as a senior- or graduate-level textual content for a school direction in HVAC method layout. The handbook used to be written to fill the void among idea and perform - to bridge the space among real-world layout practices and the theoretical caluclations and analytical techniques or at the layout of parts.

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Independent space temperature controls for each system, although this method risks control “fighting” and energy waste if the heating setpoint is higher than the cooling setpoint. Local zone control of one system while control of the other system is grouped to serve several zones with common load characteristics—such as all zones sharing the same exposure. The last alternative is often used in office buildings. For example, supply air terminals may be provided for each office module, but the perimeter heating system for an entire building (or for separate exposures of a building) may be controlled from a common point.

Levelized Cost. This method is generally used only by public utilities, since their rates are set based upon an allowable return on investment. It does not usually apply to private sector analyses. Economic analyses may be performed either in current (nominal) dollars or in constant dollars (where the effects of inflation are removed). Constant dollar analyses are generally easier to use and, for that reason, are often preferred. Many economists also believe that they yield a more accurate picture of the financial viability of a project.

The performance approach allows for greater design flexibility; this, however, requires much more design and analysis effort than the prescriptive method. Consult- 38⏐ THE DESIGN PROCESS ing fees should support the level of effort required to implement the performance approach to compliance. 1 (or parts of it) has been incorporated by reference into the building codes of virtually all states in the United States. 1 or to an earlier version. 1 in terms of requirements and compliance. 1 in those states.

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