D30−Heating, Ventilation, and Air-conditioning

Category Archives: D30−Heating, Ventilation, and Air-conditioning

Designing for Comfort & IAQ: Air distribution per ASHRAE 55 and 62.1

Photo © BigStockPhoto/Pavel Losevsky

The goal of a room air distribution system is to provide thermal comfort and a healthy living environment for occupants in the space. This article looks at designing such assemblies for comfort and indoor air quality (IAQ) per ASHRAE 55 and 62.1. It examines the common method of overhead distribution, but focuses on partially mixed (i.e. most under floor air distribution [UFAD]) and fully stratified (i.e. displacement ventilation) systems.

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Being Radiant: Planning in-slab hydronic heating and cooling

Photo © Tim Griffith

In-slab hydronic radiant heating and cooling systems, along with downsized forced-air systems, are gaining popularity as a means of optimizing thermal comfort while reducing energy consumption. Typically designed in conjunction with radiant heating, radiant cooling systems circulate cooled water through the same network of pipes where warm water circulates during the heating season. This network of pipes can turn the floors, walls, and ceilings of a conditioned space into cooled surfaces that evenly absorb heat energy.

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Designing to Prevent Infection

Photo © BigStockPhoto/Frank Boston

U.S. healthcare organizations increasingly face the most daunting medical challenge since the pre-antibiotic age thanks to an aging population and ever-increasing multi-drug resistant and environmentally adaptive pathogens. Architects and designers have an important role in providing successful patient care. They may design an environment that inadvertently accumulates, propagates, and circulates pathogens or one which is the best ally in continually mitigating the bioburden that spreads disease. What should be done?

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The State of HVLS Technology

Images courtesy MacroAir

Since the original high-volume, low-speed (HVLS) fan prototype came to market more than 15 years ago, there have been significant technology and design developments improving the way they function. Confidence in the product has grown with architects and engineers through the establishment of an Air Movement and Control Association (AMCA)-approved method of measuring the fan’s performance and, more recently, updated safety guidelines through the National Fire Protection Association (NFPA) 13, Standard for the Installation of Sprinkler Systems.

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Maintaining Montana’s Mechanical Insulation: Energy appraisal of commercial buildings

All images courtesy National Insulation Association

Used for pipes and process equipment, the potential of mechanical insulation to play a significant role in reducing energy intensity is immense, but it is often specified incorrectly or, more frequently, not adequately maintained. A mechanical insulation energy appraisal was conducted on 25 facilities surrounding Helena, Montana to determine energy-, cost-, and emission-reduction opportunities available through repair, replacement, and maintenance of systems.

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VRF Zoning Energy-efficiency Data: Five questions specifiers should ask

Images courtesy Mitsubishi Electric Cooling & Heating

As in HVAC systems, variable refrigerant flow (VRF) zoning technology is increasingly specified for its superior energy-saving benefits and precise zoned control. Nevertheless, specifiers often find it challenging to compare the energy-efficiency data of traditional commercial HVAC with VRF zoning systems. This article poses five questions that specifiers should ask about energy-efficiency data for VRF zoning and other HVAC systems, and provides the answers.

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