Oleg Tchetchel Designer of Air Moving Systems Canadian Air Systems http://nis-co.com/contact/Index.html
Canada Blower Co. has developed Direct-Fired Industrial Make-Up Air Systems for air temperature control at large industrial plants.
Direct Gas-Fired Heating Systems may be built in a number of configurations. They may be curb mounted as horizontal rooftop systems with down or horizontal discharge or in a vertical configuration for mounting on a pad outside of a building, with air ducted to the interior. They may also be located inside a building, suspended from hangers or mounted on support steel. Various manufacturers can supply any physical configuration required.
Two air flow configurations are available: 100% Fresh Air or Recirculating.
In the 100% Fresh Air arrangement, air is heated as it passes through the unit and supplied to the building space.
In the Recirculating arrangement, a damper is installed to allow a portion of building air to be supplied to the unit and returned to the building. This air is usually introduced downstream of the burner in a pull-through unit. Various percentage settings are available: 80% return / 20% fresh, 50/50, or variable.
It should be noted that demand for recirculating direct gas-fired systems has fallen in recent years. Indoor Air Quality concerns, more stringent regulations passed in recent years, and 2003, new ANSI Standards took effect. Formerly, both recirculating and 100% fresh air units were covered by the same standard. Today, ANSI Z83.4 applies to 100% Fresh Air Units and ANSI Z83.18 applies to Recirculating Units.
Typical components, options and accessories are listed below:
Mounting Curbs:
For installation on building roof. Note – As a service, some manufacturers will also specify mounting requirements for fabrication by others. This allows a contractor to field fabricate a curb for faster installation or allows for third-party fabrication of curbs where the engineer specifies seismic-resistant construction.
Inlet Hoods:
Generally an add-on item. Prevents rain and trash from being drawn into a unit.
Filters:
Filtration may be accomplished using Cleanable Filters mounted in the Inlet Hood or by using a Flat or V-bank Filter Section. For special applications, Bag Filters or HEPA final filters may be specified, but these are not common.
Clogged filter switches and indicators are often supplied to alert maintenance personnel when filters are dirty.
Fans:
Standard units are generally supplied with DWDI (Double Width, Double Inlet) Forward Incline fans. These are competitively priced and offer good performance characteristics. For High Static applications due to building pressurization, long ductwork, filtration, or other reasons, Backward Incline (BI) Fans may be required. Other options that may be specified are Backward Incline Curved (BC) or Airfoil Fans. These are BI fans with higher efficiency and performance, but at higher cost.
Insulation & Lining:
Most manufacturers offer the option of insulation and lining. Standard insulation is generally 1” thick fiberglass or foil face fiberglass board. Linings may be steel or stainless steel to isolate insulation from the air stream. This provides for longer-lasting insulation and eliminates the possibility of contaminating the air stream if insulation breaks down.
Additional information can be found at the Canada Blower company web site http://canadianblower.com/ahu/index.html.
Oleg Tchetchel
Industrial AHU Engineer
Canadian Blower
http://www.canadianblower.com/airhandler/index.html
http://www.canadianblower.com/hvac/index.html
- Related Videos
- Related Articles
- Ask / Related Q&A
- Industrial Air Handling Units for Climate Control
- Industrial Gas Fired Air Handling Units
- Commercial and Industrial Air Handling Units
- Industrial Air Handling Units
- Direct Fired Industrial Air Handling Units
- Gas Fired Industrial Air Handling Units
- A New Direct Gas Fired Air Handling Unit Design
- Commercial and Industrial Air Handling Units
Kitchen for the Information Age
By: vithya coumar | 31/12/2009The kitchen is a place in your home where most of the time spent is in this area. So here are some tips to help you get your kitchen up-to-date!
Different Dishwashing Detergents
By: Eric Kampel | 31/12/2009Dishwashing detergents can be found in liquid, powder, gel and cake forms. All these products are designed to get rid of different types of stains and suds from the surfaces.
How to Buy New Kitchen Units Quickly & Cheaply (Without the Stress)
By: Andrew Fleming | 30/12/2009Learn from an expert how to buy your new kitchen without being bothered by over eager salesmen or bamboozled by numerous options.
Benefits of Adding Kitchen Hoods
By: David Scott | 30/12/2009Did you ever think that kitchen hoods would be a real asset to any kitchen? Range hoods can help to reduce grease, smoke, steam and gaseous byproducts. Range hoods are designed to capture and filter out grease so that you do not have to spend extra time cleaning up after you cook for your family and yourself. Keeping your kitchen safe from grease will allow you to wait longer to repaint.
Top model kitchen range hood in the form of stainless range hood
By: David Scott | 30/12/2009A stainless range hood is one of the most useful kitchen appliances that are found these days. It is one type of kitchen range hood. A kitchen range hood is installed in the kitchen and helps keep the kitchen clean and airy. There are different types of kitchen range hoods that use a combination of filtration and evacuation to flush out all the heat, oil, grease, smoke and steam that are produced as byproducts of cooking.
Cast Iron Cookware with compare to other metals
By: alacartenow admin | 30/12/2009The best investment you will make is choice of best cookware. If you cook repeatedly, you want a large range of cookware. Your investment on cast iron cookware will be you best choice. Copper shows reaction with extremely acidic foods such as vinegar, citrus and tomatoes, and can leach into foods, causing diarrhea, vomiting or nausea. The major disadvantage of Aluminum is that it scratches easily and damage faster than other metal cookware because it is a soft metal. Steel cookware is cheaper, b
A good kitchen hood can make life simple and easy for the person who does the cooking
By: David Scott | 30/12/2009Cooking is not the easiest of tasks. Good food appeals to people like anything and that is why, cooking is considered an art. If the taste of the food is not enough, people seem to criticize easily. On the other hand, the taste of the food has to be really special for someone to appreciate it. For a simple, smoke and grease free life in the kitchen, one of the most important kitchen appliances is a kitchen hood. A kitchen hood, also called a range hood, is an appliance that is fitted on top of t
Utilities of Range hoods
By: David Scott | 30/12/2009Range hoods are a must needed accessory in any modern kitchen. In this age when we are super conscious about health, it is not only about eating healthy food, but also maintaining a healthy atmosphere in the kitchen. Kitchen hoods are appliances that use the technology of evacuation and filtering to weed out smoke, odor, heat, steam and grease that emanate whenever food is cooked.
Air Curtains for Large Buildings Doors
By: Oleg Tchetchel | 17/09/2009 | EducationThe idea of having an invisible barrier across the doorway to enable unimpeded access yet effectively prevent temperature flow, dust, odours and insects to cross, is appealing in itself but add to this the cost-saving in reducing energy use and the idea becomes more compelling, especially as air curtains are relatively inexpensive items. Appropriate for industrial applications Keeping warm air out of insulated cold stores or refrigerated facilities
Design of Local Exhaust Systems for Industrial Air Cleaning
By: Oleg Tchetchel | 15/09/2009 | ScienceLocal exhaust ventilation systems are designed to capture airborne chemicals at the source of generation and remove contaminants from the work area. When a local exhaust system does its job your workers are healthy and productive.
Heavy Duty Industrial Process Air Curtains
By: Oleg Tchetchel | 14/09/2009 | HealthAn air door or air curtain is a device used for separating two spaces from each other, usually at the exterior entrance. The most common configuration for air curtains is a downward-facing blower fan mounted over an opening. Normally this opening is an entrance to a building, and the air curtain is intended to help keep flying insects out by creating forceful turbulence. It also helps keep outside air out, avoiding cold drafts by mixing-in warm air from the air curtain.
Air Blowoff Systems for Industry
By: Oleg Tchetchel | 11/09/2009 | Business IdeasBlower and fan units used in tank, blender, and conveyor tube drying can reduce drying time by an average of 50% compared with natural air drying. They are almost always a direct-drive design in order to minimize size and cost. However, an in-line electric heater must be added, and this ultimately raises both the cost and total power consumption. The final assembly still must be compact enough to mount on a portable cart to easily service multiple mixers, and this portability requirement limits
Air Curtains by Canadian Air Systems
By: Oleg Tchetchel | 10/09/2009 | Causes & OrganizationsAir curtains are widely accepted across North America and Europe as a standard fitment in public buildings, retail stores and industrial applications such as coolers, freezers and cold storage facilities. Air curtains are generally associated with retaining heat energy in cold climates, and the energy savings are substantial.
Air Make-Up by Industrial Air Handling Units
By: Oleg Tchetchel | 15/06/2009 | HealthMakeup air is vitally important to the health and welfare of a building and its occupants. If the proper amount of makeup air is not introduced into a space, consequences can range from exterior doors that are hard to open or close, to buildups of carbon monoxide in the space, to fume hoods that don't actually control the contaminants they were intended to control.
Industrial Direct-Fired Air Handling Units
By: Oleg Tchetchel | 12/06/2009 | International BusinessDirect-fired units utilize air that will be sent to the heated space for combustion without use of a heat exchanger. The products of combustion are mixed directly with large volumes of outdoor air. Such mixing is considered safe because of the high dilution ratio.