Natural ventilation system in historic buildings

All historic buildings has natural ventilation system, although many of these have been compromised by the addition of partition walls and mechanical systems. With an increased awareness of the cost and environmental impacts of energy use but today we have invented some energy saving ventilation system, by using natural ventilators we can reduce energy consumption cost and for providing acceptable indoor environmental quality and maintaining a healthy, comfortable, and productive indoor climate rather than the more prevailing approach of using mechanical ventilation. In favorable climates and buildings types, natural ventilation system can be used as an alternative to air-conditioning plants, saving 10%-30% of total energy consumption means we can use it as energy saving ventilation system.

Natural ventilation systems rely on pressure differences to move fresh air through buildings. Pressure differences can be caused by wind or the buoyancy effect created by temperature differences or differences in humidity. In either case, the amount of ventilation will depend critically on the size and placement of openings in the building. It is useful to think of a natural ventilation system as a circuit, with equal consideration given to supply and exhaust(by using exhaust fans). Openings between rooms such as transom windows, louvers, grills, or open plans are techniques to complete the airflow circuit through a building. Code requirements regarding smoke and fire transfer present challenges to the designer of a natural ventilation system. For example, historic buildings used the stairway as the exhaust stack, a technique now prevented by code requirements in many cases.

Exhaust Fans for Kitchen.

Most of the people purchase exhaust fans for kitchen to remove odors that is created when some one cooking anything in the kitchen. The size of the exhaust fans are based on the Kitchen's layout and size. There are various companies in the world that are provide the kitchen layout and architectural designing services if they have a mechanical engineer on the staff that has the training and experience in calculating ventilation systems and the requirements necessary to install a kitchen exhaust system, will give us better estimation about the size of exhaust fans for the kitchens.
But there is a very important question? Does exhaust fans system is safe or not safe. The basic problem that we have not considered, when an exhaust systems specified and installed then that is what goes out must come in! In commercial kitchens, the Uniform Mechanical Code has a detailed specification for makeup air. Makeup air is the air that replaces the air that has been exhausted. Today’s construction methods are making homes tighter in order to afford energy reduction. They are built specifically to keep outside air from entering the home and the tighter the home the worse the problem.
If you install an exhaust fan that moves 600 CFM (cubic feet per minute) of air from your home, you have to replace that air. In theory, if the fan was powerful enough, which it isn’t, it would suck the air out of the home and the walls and ceiling would collapse in on themselves.
Although the walls and ceiling will not collapse in your home, things that are as bad or maybe even worse may happen. In order for your home to replace the air that has been exhausted, it will look for any opening to the outside. Items that are vented to the outside of your home include gas water heaters, clothes dryers and furnaces, oil fired furnaces and wood or gas fireplaces. An exhaust fan that is fighting for makeup air can and will create a back-draft, in other words instead of the air moving upwards from your fireplace and out the chimney it will actual cause the air to flow down the chimney and through the fireplace hearth and into the home. The same situation applies to heating appliances such as water heaters and furnaces. Instead of exhaust gases going up their chimney, fresh air will be sucked down the pipes and into the home.
Installing an exhaust fan without makeup air is not only dangerous but can create some very uncomfortable moments. You have a houseful of guests and in the great room; there is a beautiful fire in the fireplace. You turn the kitchen exhaust fan on to remove the cooking odors created from warming the hors d'oeuvres and before you can get back to your guests in the great room it is inundated with smoke and cold air. Your guests will remember your party for years to come.
Secondarily, the less makeup air available, the harder the fan must work. A fan that is rated at 600 CFM expects to have that amount of air available to exhaust. If it doesn’t it will work harder to obtain it, motors will overheat and you will not get enough air exhausted to eliminate the odors, humidity and other contaminants that you wanted expelled in the first place.
So do not oversize the exhaust fan. All reputable exhaust fan manufacturers will supply a chart of room size versus the suggested quantity of exhausted air. Follow their recommendations.
Ensure that when operating the exhaust fan that there is someway for makeup air to enter the home that is not going to create a potential safety hazard. This can be done by cracking open a kitchen window or door.
If your budget can accept the additional cost, have a vent pipe to the outside installed with an electrically controlled damper. When the kitchen exhaust fan is turned on, the electrically controlled damper opens and allows makeup air to enter the home.

The buildings in the metropolitan cities are very big while the portions in that buildings are very small, like one room or two rooms, air is blowing from different-different directions so may be your flats has not proper natural air ventilation systems and due to this the temperature in the building is differ from place to place, because of temperature difference, the air inside the building is more or less dense than the air outside the building. But if there is an opening high in the building for throw the inner air to outside and another low opening in the building for outer air to come inside the building then a natural flow of the air will be caused where fresh air will enter from the one sides and the hot humid air will rise and exit through the opening at the top, but in the metropolitan cities this type of the system is impossible so we needs to think about the artificial ventilation systems. Golden Turbovent rotate air that is inside your room and creating a higher rate of outflow of air. Wind driven ventilation system is a combination of both natural and forced air ventilation system. It is a free spinning roof ventilator which works on wind energy. It functions as a natural air ventilator when there is a difference in thermal or wind pressure between the inside and outside of the building which forces the air to move through the opening of the ventilator. It also acts as a forced ventilation system when the air ventilator rotates to create a negative pressure within the building. Cool air from outside the building will rush into the negative space within the building in order to maintain an equilibrium condition.

AnchitIspat : Manufacturer of all ventilation systems and ventilators

Ecovent works on the principle of convection thermal current and centrifugal force to exhaust. Ecovent is a light weight construction still strong, made up from high grade anodized aluminium, stainless steel epoxy coated for corrosive areas. Being light weight, ecovent can be rotated with a slight breeze. Wind ventilators have an intricate design to meet maximum rigidity and minimum weight. Being made up of Aluminium wind vent is rust proof and durable., it can withstand high wind velocities and induces ventilation even in absence of breeze. Wind vent can fit on any type of roof surface and gradient. Wind vent needs no wiring, no electricity and produces fresh air 24*7. Wind vent exhausts hot humid air, fumes and stops pollutants entering your privacy.

Natural ventilator is a globally accepted machinery without any operating costs. Natural ventilator is maintenance free. Natural Ventilator matches your building's architectural and aesthetic appearance. Natural ventilator is effective regardless of wind direction. Natural Ventilators are mainly applicated in godowns, industries, auditoriums, hospitals and even for domestic purposes. Natural ventilators is a quality product and its installation process is done to ensure 100% effective performance.

Air ventilation system involves the principle of centrifugal blowers, as the stale and polluted fumes are exhausted out, the equal amount of fresh air is distributed in each and every corner of the room through duct work in Air ventilation system . This Air ventilation system is very efficient and to install. This air ventilation system will remove all those stale fumes from your kitchens, living room and bathrooms. Good ventilation protects both health and home. for more details about the installation and suppliers visit us at AnchitIspat

Technorati Profile

Air Ventilation System

The air ventilation is a process or intentional movement of air from outside the building to the inside the building. but if air Movement of air occur only inside the building and not the outside the building then this is called transfer of air as we seen the air generated by the Ceiling and table fans. But when people or animals are present in side the buildings then a proper air ventilation system is very necessary to dilute odors and limit the concentration of carbon dioxide and airborne pollutants. Air Ventilator is also delivers air by mechanical systems which may also generate heat, cool, humidify and dehumidify the space. Air movement into buildings can occur due to uncontrolled infiltration of outside air through the building fabric or the use of deliberate natural ventilation strategies. Advanced air exchange ventilators starts cleaning and recirculating a proportion of the air inside a building and you feel very good climate inside your home or building, In certain places, such as submarines, pressurized aircraft, and spacecraft, air ventilation system is also needed to provide natural oxygen, and to dilute carbon dioxide for survival. Buildings on Earth have significant air leakage, and rarely have been found to have dangerous levels of oxygen and carbon dioxide. Inadequate ventilation in a densely occupied room can cause the level of carbon dioxide to increase leading to sleepiness and reduced your efficiency at work. This is a matter of concern in schools where attentiveness and learning ability may be adversely affected because there is very less chances of the natural air ventilation. Natural ventilation is the process of supplying and removing air through an indoor space by natural means. There are two types of natural ventilation occurring in buildings, wind driven ventilation and stack ventilation.