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Nall D.H.,Syska Hennessy Group
ASHRAE Journal | Year: 2015

Underfloor air-distribution (UFAD) systems have been designed and built in the United States for more than 20 years with various degrees of success. The system remains controversial, with both advocates and detractors, but has experienced significant penetration in some markets. The most common complaint with these systems, however, is that spaces are chronically over-cooled.1 Many critical factors have been identified for avoiding this pitfall, but the implementation of effective control strategies is arguably the most important step. Copyright 2015 ASHRAE. Source

Nall D.H.,Syska Hennessy Group
ASHRAE Journal | Year: 2015

Although the term "resilience" has become a hot button in the high performance building community, it seems to have different meanings in different contexts. This column will try to identify these differences and discuss the issues the concept raises for MEP engineers. Copyright 2015 ASHRAE. Source

This paper presents a holistic approach for embedding operations and maintenance (O&M) best practices considerations into the engineering and design of critical facilities. The paper discusses including various aspects of critical facility O&M within the design phase and throughout construction and commissioning to support continuous operations throughout the life of the facility. The paper addresses the physical aspects of the critical infrastructure and how it relates to efficient O&M, how staffing organization and makeup requirements should influence design strategies, and various O&M processes, tools, and potential synergies in developing O&M processes and procedures concurrently with designing and constructing the facility. © 2011 ASHRAE. Source

Quirk D.,Verizon Wireless | Sorell V.,Syska Hennessy Group
ASHRAE Transactions | Year: 2010

ASHRAE Technical Committee (TC) 9.9 "Mission Critical Facilities, Technology Spaces and Electronic Equipment" was established to create guidance on the environmental protection of such environments in an energy conscious manner. It's extremely important to note the first word in the quotes of the preceding sentence - Mission. Mission must always precede energy in terms of priorities. Energy consciousness does not mean that energy savings should be pursued at the expense of mission. Unfortunately, understanding where this line is drawn is not very easy and it takes delving into many finer details to distinguish the difference. One particular area of great energy savings, but equally great challenges to the mission, is the use of economizers. This paper attempts to arm the reader with an increased understanding of several aspects of the application of both airside and waterside economizers to datacom facilities so that the right decisions and considerations can be made to serve BOTH mission and energy. ©2010 ASHRAE. Source

Nall D.H.,Syska Hennessy Group
ASHRAE Journal | Year: 2016

ANSI/ASHRAE/IES Standard 90.1, Energy Standard for Buildings Except Low-Rise Residential Buildings, has evolved rapidly over the years. As it has evolved, the requirements have changed, and some of these requirements have been overlooked by the engineering community. Some of these requirements are mandatory, meaning they must be incorporated on all projects for which they are applicable, and others are prescriptive. Copyright 2016 ASHRAE. Source

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