New Test Standard for Dilution Blowers
For reasons of safety and health, not to mention litigation, consulting and facility engineers long have insisted on independent performance verification...
U.S.'s Largest Indoor Water Park Gets World-Class IAQ With Fabric Ducts
Billed as America's largest indoor water park, the new 70,000-sq-ft Wild Water-Dome at Wilderness Hotel & Golf Resort in Wisconsin Dells, Wis., presents...
Choosing the Right Air Filter and Filter Media
Poor indoor-air quality (IAQ) is more than just a nuisance; it is costly. For example, total costs to the U.S. economy because of poor IAQ reach as high...
CO2 - vs. Cfm-Based Ventilation Assessments
For a healthy and productive indoor environment to be achieved, a mechanism is required to verify (1) the amount of outdoor-air (OA) ventilation being...
Ventilation Strategy for Laboratories
A large portion of a laboratory's space-cooling load is the result of heat produced by research equipment. If heat can be captured at its source, its...
Defective Dampers
Our firm received an assignment from the state to provide damper monitors on dampers contained in all of a developmental facility's cottages. These dampers...
HVAC Duct Design for Colleges, Universities
Throughout much of the 20th century, acoustics and indoor-air quality (IAQ) largely were overlooked in the design of classroom buildings on college campuses....
NEW EQUIPMENT AND RESOURCES
Energy-recovery ventilators German-engineered, energy-recovery ventilators offer a 6-in.-diameter collar system that is designed for one-person installation....
Common Sense
While visiting an automobile assembly plant, I came to an area in which cars often were turned around. They were backed into a small space that had no...
Airing Out Problem
Our company was involved in a project to renovate an existing hospital space to make way for a new pharmacy. Our first task involved a visit to the space...
Hospital-Acquired Infections
One of the first articles I read after returning home from my most recent trip to the hospital (three operations in just over two weeks) was Air-Treatment...
NEW EQUIPMENT & RESOURCES
Exhaust fans Tested and certified to withstand winds of up to 150 mph, high-wind and hurricane exhaust fans do not require ties to a roof. The fans feature...
Engineering a Fan-Wall Solution
When the aging air-handling units (AHUs) at the Art Institute of Chicago (AIC) needed to be replaced, the AIC's project manager, C.Lee; the executive...
What's New About ASHRAE 90.1, 62.1
Editor's note: On Jan. 25, HPAC Engineering produced with sponsorship from ABB a Webcast titled What's New About ASHRAE Standards 90.1 and 62.1. Throughout...
Design Guidelines for Stratification in UFAD Systems
The control of room-air stratification is critical to the design and operation of successful underfloor-air-distribution (UFAD) systems, representing an oftentimes complex balancing act: Increasing stratification by reducing airflow or mixing for a given space heat load saves energy, while decreasing stratification by boosting airflow or mixing for a given space heat load improves occupant comfort....
Louver Design Considerations
After selecting a louver model that best fits an application, system designers need to consider certain characteristics when sizing the louvers. In this article, characteristics that affect water penetration, pressure drop, and louver installation will be examined. By using the following suggestions, designers will maximize louver performance and ensure that louvers are equipped to meet the needs of their specific application. ...
Simple Upgrade of Filter Helps Bank Achieve Award-Winning Air Filtration
Looking to provide a cleaner, healthier indoor environment for the 450-plus employees at its headquarters in Scottsdale, Ariz., 1st National Bank of Arizona...
CFD Analysis Assists in Optimization of Displacement-Ventilation System
With ventilation-system performance highly dependent on a number of variables, such as the size and placement of supply diffusers and return grilles and...
LEED Opportunities for Raised Floors in Schools
With modes of operation/building use forever changing, building owners increasingly are choosing to implement HVAC designs emphasizing flexibility and...
The Three Stooges
After I moved to Florida, I designed one of the first distribution systems for an elementary school. The project was fast-track and had to be constructed...
Correction
Six-pascal (0.02-in.-wg) accuracy can be maintained in Biosafety Level 4 laboratories so that, for example, a 50-pascal pressure difference between rooms...
All's Well That Ends Well
A few years back, one of my clients was a well-known engineering firm in New York City. My work for the firm consisted of engineering oversight on projects...
The Impact of System Type on the ADPI and Air-Outlet Devices
In 1967, the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) introduced the Air Diffusion Performance Index (ADPI),...
Elbow Grease
The engineers for an automobile plant designed an air-supply system with the top horizontal discharge blower in the penthouse located as high as possible...
Unintentionally Flying Object
In the mid-1950s, my company installed an air-conditioning system in a downtown corporate headquarters building in El Paso, Texas. The system was topped...
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