Ventilation Equipment - A US Market Overview03 Jun 2011 • by Natalie Aster
The coming 2-3 years are expected to witness a spurt in new construction, which augurs well for the overall ventilation equipment market. Growing awareness, pertaining to Indoor air quality and energy efficiency standards across residential, commercial and industrial sectors, is also expected to contribute to growth in ventilation market.
Ventilation product segments analyzed in this study include Axial Fans, Centrifugal Fans, Centrifugal Blowers, Cross Flow Fans, Domestic Exhaust Fans, Power Roof Ventilators, Range Hoods, Industrial Propeller Fans, Air Handling Units (AHUs) for Ventilation and Heat Recovery (HRV)/Energy Recovery Ventilation (ERV) Units.
Unit shipments of ventilation equipment in the United States, standing at 23.43 million units in 2006, are expected to maintain a marginal CAGR of 0.10% over 2006-2015 and reach 23.65 million units by 2015. On the other hand, value shipments are forecast to exhibit positive growth of 5.05% CAGR over the analysis period and stand at US $3.73 billion by 2015, as against US $2.4 billion in 2006.
The market report “Ventilation Equipment - A US Market Overview” by Industry Experts includes the complete competitive landscape for ventilation market in the United States which comprises market share analysis (2009) for leading market players including Nortec, Greenheck Fan Corporation, Air Systems Components, Twin City Fan Companies, CaptiveAire Systems, Munters, Howden Group Ltd, Robinson Fans and Flakt Woods. The study analyses these major players with respect to key inancials, product listing & analysis, key brands, competitors and production plant locations & capacities. The report also profiles 39 other key market players in the United States.
Published: May 2011
Price: USD 2,700
Report Sample Abstract
Enhanced Air Quality and Low Energy Consumption by Using Thermal Displacement Ventilation
Indoor environments of inferior quality are major causes of adverse effects of health, performance and attendance of occupants. In several current building space conditioning systems, conventional mixed ventilation systems are not adequate in supplying indoor air quality, acoustics and comfort required for optimum performance of occupants.
Overcoming this by using Thermal Displacement Ventilation (TDV) provides an economical alternative in maximizing indoor air quality. TDV can deliver a cool air supply directly to the occupants within a space.
Heated or cooled air enters a room at about 65oF (18.3oC), which is much warmer than air supplied by a regular air conditioning system. The fresh air is made available near the floor at a very low velocity, and falls towards the floor due to gravity, before spreading across the room, where it encounters heat sources. This air gradually rises as it picks up heat from occupants and equipment. The warm and stale air moves up towards the ceiling and is drained from the space. The resultant vertical airflow pattern is called a thermal plume and is highly effective in curtailing the spread of germs. The air distribution system, in turn, offers efficient ventilation, as fresh supply air is delivered directly to each occupant.
Passive and Active Thermal Displacement
Passive thermal displacement ventilation works on the principle that cooled air is supplied with low momentum in the lower part of the room. This cold air is able to displace contaminated air from the occupied zone upwards in the room. Air movement in the room is controlled by buoyancy forces (temperature differences) and free convection around heat sources, such as machines, persons and lighting, creates vertical air movements in the room. Formation of horizontal layers of air, with the warm air staying under the ceiling and the cold air staying in the occupied zone is a key feature of displacement ventilation. Movement of air in the horizontal direction in the “temperature equilibrium zone” is fairly easy, but vertical movement of air across different layers requires excessive forces. Thus, convective flows from heat sources act as engines for displacement ventilation. Ceilings accommodate the exhaust openings that extract hot and contaminated air.
Unlike passive displacement ventilation, active displacement diffusers are able to supply a part of the air with high impetus. This means that the flow is relatively independent of buoyancy forces and can be used for the purpose of heating. As some quantity of the air supplied through nozzles is high in momentum, velocity levels and degree of air turbulence are higher that causes a decrease in comfort levels around the duct. Due to this reason, active thermal displacement ventilation with vertical displacement diffusers is typically used in industrial applications.
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