SMACNA - Sheet Metal and Air Conditioning Contractors' National Association Inc.

SMACNA HVAC SYSTEMS APPLICATIONS

Fri, 01 Jan 2010 00:00:00 GMT

SMACNA HVAC SYSTEMS APPLICATIONS; HVAC SYSTEMS APPLICATIONS - SECOND EDITION SMACNA - Sheet Metal and Air Conditioning Contractors' National Association Inc. HVAC SYSTEM PURPOSE
The purpose of an HVAC system is to provide a suitable thermal environment in a defined space that meets the needs of the occupants and the activity that takes place in the space. Most HVAC systems are installed to establish an indoor environment within which building occupants can live, work, and play. The indoor environment impacts the quality of life, productivity, and well being of building occupants. As people spend an increasing amount of time inside buildings HVAC systems and their associated control systems are becoming more important. To address this growing need this manual focuses on HVAC equipment that creates human comfort indoors. Energy use in buildings is becoming increasingly important and impacting the type of the HVAC distribution system design, the HVAC equipment specified, and how the HVAC operates. HVAC systems are also required to provide suitable environmental conditions in addition to providing human comfort. In addition, energy use in buildings is becoming increasingly important and impacting the type of the HVAC distribution system design, the HVAC equipment specified, and how the HVAC operates. HVAC systems are also required to provide suitable environmental conditions for purposes other than human comfort.

SMACNA 1987

Sun, 01 Jan 2006 00:00:00 GMT

SMACNA 1987; HVAC DUCT SYSTEMS INSPECTION GUIDE - THIRD EDITION SMACNA - Sheet Metal and Air Conditioning Contractors' National Association Inc. This document gives reasons for doing inspections of air handling systems, provides outlines that can be used to organize and conduct inspections, and sets forth checklists that call attention to the basic features of ductwork and items placed in duct systems.
It presumes that SMACNA's construction standards are used as the basis of compliance, whether they are explicitly invoked in contract documents or in codes. No attempt is made to segregate designer's inspection obligations from those of code officials.
It is primarily prepared for commercial HVAC systems; however, similar principles would apply for residential or industrial work inspection. Furthermore, it assumes that prescription specifications apply rather than performance specifications. Performance specifications typically call for HVAC systems to maintain control of the environmental within certain tolerances. Whether the duct system has the specified airflow rate, maintains air temperature, humidity, degree of cleanliness, etc., or whether it controls room air motion and pressure differentials in relation to adjacent spaces are separate matters of design and testing and balancing that are already dealt with in numerous handbooks and standards. An overview of the functions of duct systems is given in Appendix A.
Finally, although this document covers some items that are safety related, this document is not a safety inspection guide. It is presumed that the applicable codes and system designs that are allowing use of the SMACNA standards and manuals address safety issues independently.

SMACNA 1429

Sat, 01 Jan 1994 00:00:00 GMT

SMACNA 1429; HVAC SYSTEMS COMMISSIONING MANUAL - First Edition; Third Printing: April 2004 SMACNA - Sheet Metal and Air Conditioning Contractors' National Association Inc. The HVAC Systems Commissioning Manual is intended to cover the full range of HVAC equipment and systems typically found in commercial and institutional buildings.
The level of commissioning varies to suit the specific requirements of each project as determined by the owner.
The manual describes in detail the commissioning process for three different levels of commissioning. In addition, as an aid to users, it provides examples of pre−start checklists and functional performance test checklists for many types of equipment and systems. These include:
• Hot water and steam boilers; with atmospheric or power burners; gas, oil, or combination gas/oil fired.
• Chillers; with reciprocating, scroll, screw, or centrifugal compressors; air cooled or water− cooled; with or without condensers; and including heat recovery models.
• Cooling towers, closed circuit heat rejectors, and both air cooled and evaporative condensers.
• Hot water, chilled water, and condensing water pumps associated with the preceding.
• Constant volume, single zone air systems (including all components such as fans, coils, furnaces, condensing units, dampers, and controls, as applicable).
• Constant volume, reheat air systems (including all central equipment, zone reheat components, and controls).
• Variable air volume (VAV) systems (including all central equipment, VAV terminals, and controls).
• VAV reheat systems (including all central equipment, VAV reheat terminals, and controls).
• VAV systems with fan powered terminals (including all central equipment, fan powered VAV terminals, and controls).
• Water loop heat pump systems (individual heat pumps and loop pumping, heat rejection, and supplementary heating).
• Fan coil units (including their controls and the systems used to provide them with outside air, heating, and cooling, as applicable).
• Outside air makeup and exhaust systems.
• Pressurization systems, for fire emergency use.
• Smoke control systems.
• Controls integral with any of the preceding equipment and systems.
• Valves, sensors, actuators, and controls external to the equipment, but required for control of fluid flow, temperature, or other parameters.
• In addition to the preceding specific equipment and systems, the manual also covers the commissioning of automatic actuation interfaces between HVAC systems and other building systems. The most common of these are fire alarm systems and sprinkler systems.
PURPOSE
Over the past several years, there has been increasing recognition in the building construction industry of the need for effective building systems commissioning. For a number of reasons, industry commissioning efforts have focussed on heating, ventilating and air conditioning (HVAC) systems. First, HVAC systems are among the most complex and interconnected of building service systems. Second, considerable energy is consumed in HVAC systems. Inefficient operation increases operating cost. Third, occupant comfort demands and concerns about substandard indoor air quality are both increasing. HVAC systems must be designed properly, then installed, operated, maintained, and serviced correctly, if both comfort and indoor air quality are to be attained.
The primary purpose of this manual is to provide guidance to contractors on how an effective HVAC systems commissioning process should be planned and carried out. A second purpose is to provide a clear explanation of the reasons for commissioning to make it understandable for a broad cross section of the industry. Contractors who understand commissioning are in a position to sell its use to owners, designers, and others.
Another purpose of the manual is to provide guidance on recommissioning HVAC systems in existing buildings. Any existing building with poor temperature control, dissatisfied occupants, excessive energy or maintenance costs, or other evidence of improper design or operation is a candidate for recommissioning. Because there are many existing buildings with these characteristics, and owners often contact contractors directly for remedial work on them, provision of recommissioning services is a potentially important field for knowledgeable contractors.
This manual covers commissioning during the construction phase of a project in considerable detail. It puts particular emphasis on the commissioning agent, the commissioning authority, the commissioning plan, communication and coordination during construction, and commissioning documentation. This is to give the clearest possible guidance to contractors and others whose involvement is primarily during the construction phase of a project.
This manual does not provide material specific to any particular building. The material within is intended to cover the entire commissioning process, providing not only organizational and procedural steps, but also the rationale behind them. This assists users of the manual to adapt the information to the successful commissioning of building projects.

SMACNA 1637

Thu, 01 Jan 1998 00:00:00 GMT

SMACNA 1637; Indoor Air Quality: A Systems Approach - Third Edition SMACNA - Sheet Metal and Air Conditioning Contractors' National Association Inc. FOREWORD
As the Indoor Air Quality (IAQ) industry has changed over the years, and with coming changes on the horizon, the SMACNA contractor needs to be equipped to handle this every changing market and opportunities. The SMACNA Building Services Task Force was formed to address these issues and develop a manual that provided the hands-on application that would be required by today's contractor.
This "state-of-the-art" manual should identify IAQ problems as they are currently defined, the methods and procedures used to solve them, the equipment and instrumentation that is used, and the changes that must be made to the building and the building HVAC systems.
This publication is intended to present in a clear and concise, yet comprehensive manner the sources of pollutants, methods of control, and the management techniques necessary to maintain acceptable indoor air quality in today's market. The SMACNA Building Services Task Force recognizes that this new manual contains the latest information available, and will need to be revised or updated as newer information becomes available.
SMACNA wishes to thank the efforts and funding of the National Energy Management Institute in assisting in the development of this manual for the industry.