COMPUTER APPLICATIONS IN HVAC SYSTEM （计算机应用在暖通空调系统中）.pdf

COMPUTER APPLICATIONS IN HVAC SYSTEM LIFE CYCLE COSTING Fundamental Principals and Methods For Analyzing and Justifying System Installation and Upgrade Costs Communication White Paper by: Craig J. Gann, P.E. Carrier Corporation, Syracuse, NY 2 Computer Applications in HVAC System Life Cycle Costing by Craig J. Gann, P.E. SUMMARY This paper first explores the fundamentals of Life Cycle Cost Analysis, familiarizes the reader with commonly-used terminology and concepts, then demonstrates computerized applications to perform an actual Life Cycle Cost Analysis example. The methodology used encompasses the concepts of Net Present Value and Internal Rate of Return . Emphasis is placed on HVAC equipment, however the fundamental concepts discussed herein are applicable to any building component under consideration. INTRODUCTION With the strong trend in the HVAC industry emphasizing energy savings, there is an equally powerful force, primarily owner-driven, which dictates that installed costs of new and replacement systems be as economical as possible. There is a delicate balance between these two influences since reducing energy consumption by installing higher-efficiency equipment often must be achieved at the cost of sacrificing installed first-cost savings. The owner or owners agent must carefully analyze various systems and installations to determine those with the most economical overall cost, which involves simultaneously analyzing future operating and maintenance costs against the initial first-cost purchase price of the equipment. There are many types of software programs ava