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Nall D.H.,Syska Hennessy Group
ASHRAE Journal | Year: 2017

Grocery stores are among the most energy-intensive commercial buildings, consuming two to three times as much energy per unit floor area as offce buildings. The single-largest energy end use component of grocery building consumption is refrigeration. In current practice, most of the energy extracted from refrigerated cases and walk-in coolers is rejected to the outdoors. Signifcant gains in effcient operation of grocery stores can be achieved by recovering this rejected heat to meet various lowgrade heating requirements within the stores. The recent Advanced Energy Design Guide for Grocery Stores: Achieving 50% Energy Savings Toward a Net Zero Energy Building1 offers a number of ways the design of the refrigeration and HVAC systems in grocery stores may be integrated to achieve this savings.


News Article | May 10, 2017
Site: www.prnewswire.com

NEW YORK, May 10, 2017 /PRNewswire/ -- About Data Center Construction A data center is a centralized storehouse, physical or virtual, for remote storage, and processing of data and information. Data centers constitute the backbone of essential business operations. There is a significant amount of growth in enterprise applications worldwide because of the use of advanced technologies to gain a competitive advantage. Enterprises are focusing on the construction of green data centers to reduce power consumption and their impact on the environment. The construction of a data center includes design, architecture, installation of electrical and mechanical systems, as well as general construction services. Data center certifications have grown in importance, especially for colocation and managed hosting service providers, to attract customers. Read the full report: http://www.reportlinker.com/p04886851/Data-Center-Construction-Market-in-the-US.html Technavio's analysts forecast the data center construction market in the US to grow at a CAGR of 6.34% during the period 2017-2021. Covered in this report The report covers the present scenario and the growth prospects of the data center construction market in the US for 2017-2021. To calculate the market size, the report considers the revenue generated from the investments made in new data centers and the renovation of existing ones. Technavio's report, Data Center Construction Market in the US 2017-2021, has been prepared based on an in-depth market analysis with inputs from industry experts. The report covers the market landscape and its growth prospects over the coming years. The report also includes a discussion of the key vendors operating in this market. Key vendors • Corgan Associates • DPR Construction • Fluor • Gensler • HDR • Holder Construction Group • Jacobs Engineering Group • Syska Hennessy Group • Turner Construction • Page Southerland Page • Vanderweil Engineers Other prominent vendors • AECOM • AKF Group • Balfour Beatty • Carlson Design Construct • Clune Construction Company • Fortis Construction • Gilbane • Hensel Phelps Construction • HITT Contracting • Integrated Design Group • JE Dunn Construction • McGough • Merrick & Company • Mortenson Construction • Pepper Construction • Skanska • Structure Tone • Whiting-Turner • Wendel Market driver • Tax incentives for data centers and reduction in electricity cost. • For a full, detailed list, view our report Market challenge • Rise in construction and installation costs. • For a full, detailed list, view our report Market trend • Increase in the purchase of renewable energy sources. • For a full, detailed list, view our report Key questions answered in this report • What will the market size be in 2021 and what will the growth rate be? • What are the key market trends? • What is driving this market? • What are the challenges to market growth? • Who are the key vendors in this market space? • What are the market opportunities and threats faced by the key vendors? • What are the strengths and weaknesses of the key vendors? You can request one free hour of our analyst's time when you purchase this market report. Details are provided within the report. Methodology Read the full report: http://www.reportlinker.com/p04886851/Data-Center-Construction-Market-in-the-US.html About Reportlinker ReportLinker is an award-winning market research solution. Reportlinker finds and organizes the latest industry data so you get all the market research you need - instantly, in one place. http://www.reportlinker.com __________________________ Contact Clare: clare@reportlinker.com US: (339)-368-6001 Intl: +1 339-368-6001 To view the original version on PR Newswire, visit:http://www.prnewswire.com/news-releases/data-center-construction-market-in-the-us-2017-2021-300455572.html


SAN FRANCISCO, Nov. 9, 2016 /PRNewswire/ -- Robert Bolin, PE, LEED Fellow, ASHRAE HBDP, Senior Principal with Syska Hennessy Group, Inc. a global consulting, engineering and commissioning firm, has relocated to the firm's San Francisco location where he will continue to serve in a...


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.


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.


Khankari K.,Syska Hennessy Group
ASHRAE Transactions | Year: 2011

During power outages servers in the data centers are generally powered by uninterruptible power supplies (UPS). At the same time the sources for active cooling such as CRACs, CRAHs, and chillers stop operating for a period until powered by alternate power sources. During this period servers continue to generate heat without any active cooling. This results in increase in the room air temperature within a short period that can be detrimental to the servers. This paper, with the help of a mathematical model, indicates that the rate of heating of a data center can start initially at a certain maximum level, and can then gradually reduce to a certain minimum level, which is the lowest possible rate of heating that a data center can attain. The rate of such exponential decay is a function of the time constant, which is the characteristic of a data center design and layout. The time constant depends on the heat capacity ratio and the specific surface area of racks in a data center. This paper analyzes various factors that affect these parameters and demonstrates how the time constant can be employed as a matrix to compare the thermal performance of data centers during the power outage period. © 2011 ASHRAE.


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

Electric motors are the universal drivers of HVAC components. With a few exceptions, such as steam turbine-driven chillers and combustion engine driven chillers, electric motors, ranging in size from fractional horsepower to thousands of horsepower, provide the driving forces for HVAC systems. Many different types of motors are suitable for many conditions such as high and low temperature, moisture, high humidity, and/or corrosive or explosive environment.


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.


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

Direct-expansion (DX) cooling and heat pump systems have often been the less- respected alternative for building conditioning compared with hydronic systems. In general, they are considered to be a "cheaper" system, with higher maintenance cost, shorter lifespan, limited controllability and lower energy efficiency. On the other hand, they are often more convenient, more amenable to design-build procurement, and less demanding of operator expertise.


Khankari K.,Syska Hennessy GrouP
ASHRAE Transactions | Year: 2010

During power outage servers in the data centers are powered by uninterrupted power supply (UPS). At the same time, the cooling system components such as CRACs, AHUs, and chillers stop operating for a short period until powered by alternate power sources. During this period servers continue generating heat in the data center room without active cooling. It is common notion that data centers contain large thermal mass, and hence, large heat capacity in the steel rack enclosures to protect servers from the thermal shock due to rising room air temperatures. However, the rate of air temperature rise and the availability of rack thermal mass depend on several factors including the height of the data center room, number of rack enclosures and their size, number of rack rows and their layout, and heat load density of a data center. It is crucial for design engineers and facility managers to know how much time can be available for restarting the active cooling systems before servers reach automatic shutoff temperatures. With the help of a heat transfer model this paper systematically analyzes the effect of various parameters and the impact of rack thermal mass on the time that air requires to reach the thermal shutoff threshold temperature. ©2010 ASHRAE.

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