By ASHRAE Press
The air-con guide was once written to help entry-level engineers within the layout of air-conditioning structures. it's also suable - in conjuction with primary HVAC&R resourcee fabric - as a senior- or graduate-level textual content for a college path in HVAC process layout. The guide was once written to fill the void among concept and perform - to bridge the space among real-world layout practices and the theoretical caluclations and analytical methods or at the layout of elements.
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Extra info for Air Conditioning System Design Manual, Second Edition
ASHRAE. 2004c. 2004 ASHRAE Handbook—HVAC Systems and Equipment. Atlanta: American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. ASHRAE. 2005a. ASHRAE Guideline 0, The Commissioning Process. Atlanta: American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. ASHRAE. 2005b. 2005 ASHRAE Handbook—Fundamentals. Atlanta: American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. ASHRAE. 2005c. ASHRAE Pocket Guide for Air-Conditioning, Heating, Ventilation, and Refrigeration Atlanta: American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc.
This index normalizes the total benefits to a single unit of invested capital. It is a useful concept for making choices among different projects when the amount of available capital for investment is limited. Internal Rate of Return (IRR). The IRR is the discount rate that makes the NPV equal to zero. It is obtained by iterative calculations once the cash flow stream has been identified. Because the AIR-CONDITIONING SYSTEM DESIGN MANUAL⏐41 IRR is a percentage, it is intuitively easy to communicate to a broad variety of clients.
To some degree, a building's air-conditioning system can influence the ratio of rentable area to gross area. While equipment located on the floor under windows may occupy otherwise usable space, this space is almost always included in the rentable area. Thus, no reduction in income results from the use of underwindow units. If air-conditioning equipment to serve each floor is located in a mechanical equipment room on that floor, such space may also be included in the net rentable area. Compare this concept to a central system serving an entire building from a rooftop penthouse through supply and return duct shaftways.