Hubei Forry Environment Tech. Co.,Ltd

Industry News >> ATTIC AIR MOVEMENT CAN REDUCE INDUSTRY AIR CONDITIONING COSTS

 Stage wise heat reduction from the industry roof top to the user area is cost effective to implement now and the running power cost of Air conditioning, cooling and air handling equipments reduces instantly. The industry needs to improve the comfort of the workers, then the machines, and the working environment in stages. For this, to first give thought process of how much industry suffers due to the extended dry weather summer conditions in the India and especially in the other tropicalized regions of the world.

The industry can concentrate on the attic air circulation & ventilation now so that the Solar heat load on the premises can be very much reduced. The heat load to the plant is mainly due to the equipments and the balance heat load is due ambient dry weather conditions in the Sunny days. We have to reduce in stages, first by primary prevention & insulation and then by the Secondary air circulation and ventilation.

WHAT IS THE EXISTING CONDITION IN THE INDUSTRY INFRASTRUCTURE NOW?

1. Decades back, the industry provided passive cement roof vents in their Inverted V roof top and they are not at all effective now.

2. The industry provided Turbo vent as powerless roof vents on the top of the roof, but in many industries, they silently ignored the Air supply points from the bottom sides of the roof and no provision is done for air suction to attic area and if the air comes in attic only, then the same can be exhausted thro roof vents.

3. The latest Turbo Powerless roof vents are directly mounted on the slant slope of the roof, thereby after few months or years, they stopped working due to increased friction arising out of uneven load on the ventilator bearings.

4. The turbovent needs to have mandatory guide chamber so that the turbovent is fixed exactly parallel with respect to ground level, so that the turbovent rotates freely without friction, smoothly for years.

ATTIC AIR MOVEMENT CAN REDUCE INDUSTRY AIR CONDITIONING COSTS.

Stage wise heat reduction from the industry roof top to the user area is cost effective to implement now and the running power cost of Air conditioning, cooling and air handling equipments reduces instantly. The industry needs to improve the comfort of the workers, then the machines, and the working environment in stages. For this, to first give thought process of how much industry suffers due to the extended dry weather summer conditions in the India and especially in the other tropicalized regions of the world. The industry can concentrate on the attic air circulation & ventilation now so that the Solar heat load on the premises can be very much reduced. The heat load to the plant is mainly due to the equipments and the balance heat load is due ambient dry weather conditions in the Sunny days. We have to reduce in stages, first by primary prevention & insulation and then by the Secondary air circulation and ventilation.

WHAT IS THE EXISTING CONDITION IN THE INDUSTRY INFRASTRUCTURE NOW?

1. Decades back, the industry provided passive cement roof vents in their Inverted V roof top and they are not at all effective now.

2. The industry provided Turbo vent as powerless roof vents on the top of the roof, but in many industries, they silently ignored the Air supply points from the bottom sides of the roof and no provision is done for air suction to attic area and if the air comes in attic only, then the same can be exhausted thro roof vents.

3. The latest Turbo Powerless roof vents are directly mounted on the slant slope of the roof, thereby after few months or years, they stopped working due to increased friction arising out of uneven load on the ventilator bearings.

4. The turbovent needs to have mandatory guide chamber so that the turbovent is fixed exactly parallel with respect to ground level, so that the turbovent rotates freely without friction, smoothly for years.

 

• As a practicaly analogy, now we are allowing the solar heat to enter the premises from the top and then provide false ceiling to suppress the heat further. What is happening to us for example, we feel the comforts differ in three ways as 1) when we stand under the Sun, 2) walk under the Sun, 3) go by two-wheeler under the Sun. The impact is least felt under the sun when we go by two-wheeler because of the air breeze. Similarly the roof or the attic is made well circulated so as to ventilate by force thro the lateral high volume low pressure exhaust fans or by self propelled roof extractors. This brings down the under roof temperature by say 5 to 10 degrees C or more. The existing attic hot stale air is forced out and heat is not felt in false ceiling as well in supply ducts thro Air Handling Units.

• Generally the roof heating by solar radiation causes 50 % of the heat load in any premises. Though in some of the industries, we have gone for false ceiling to avoid the same, still the plant needs to be insulated from the climate extremes of day & night and that of summer & winter.

ATTIC INSULATION ACHIEVED BY PRIMARY PREVENTION AND INSULATION:-

* There are many methods to suit to the industry, and the surrounding environments like

1. Ridge type ventilators so that the top layer roof reduces the heat load to the bottom layer roof.

2. acrylic based reflective paint coating on roof; by heat reflective paints with minimum 5 years life

3. pucca comfortile type weatherproof tiling if the same is terraced.

3. Powerless or Turbovent roof extractors on the top of the roof,

4. Underdeck insulation by Polystere material and is one time investment.

5. an eco-friendly idea of growing tall lean trees around conditioned premises.

6. green plantations over the roofing if the area is small and if the ambient suits.

7. Open terraced buildings can provide slope metal / cement sheet at a height of say 2 meters from the terrace and leave all the sides open on the parapet walls. This will also reduce the building heat load instantly. Also, a half cut across PVC pipe at the bottom of slope to collect the roof water and harvest the same.

8. Some industries are cooling their roof with evaporation of water over their roof. But now water has become precious now for us. Water soaked hessian cloth, water sprinkling during peak hours of day etc were tried before. Provided the water is available for Re-use, then the same can be tried for this, instead of rejection.

9. This can be done over the production sheds, utility sheds like the MCC, compressor house, DG house + in the RCC terrace.

 

ATTIC COMFORT BY SECONDARY VENTILATION BY CIRCULATION:-

1. Previously industry used N type attic ventilator assuming the air movement will be there in the attic area.

2. But what we find now, is that the hot stale air does not move out the attic thro these ventilators.

3. we have to force the Positive Cross Ventilation inside Attic with fresh air suction fans, to comfort attic.

4. lateral circulators and ventilators using High volume Low Static lower HP fans can be tried additionally.

5. the attic fan definitely helps to remove the stale hot air under ceiling & insulate false ceiling from solar heat

load by effecting the air changes, air movement at a very low fraction of power cost of AHUs working inside.

6. This method of attic ventilation and cross ventilation inside premises is low cost energy saving type

7. compared to high cost cooling of equipments & premises below the false ceiling in the industry shed.

8. These fans can be provided with V type pre filter as done in textile spinning mill humidication plants, the

same cleanable from outside routinely. This is to avoid bird, insects and not allowing them to enter attic.

9. Also, the Air Handling units, the air supply ducts, supply air Plenum etc needs to be well insulated

 

 Remember: A few degree temperature drop of air inside duct at the start; and at the outside duct due to attic ventilation is easy to achieve and consumes less power. Compared to require temperature reduction inside the premises and this consumes more power and difficult to achieve.

POINTERS TO THE INDUSTRY:-

1. The industry till date, planned to do only one action against Solar Heat Ingress on its roof top. This only one point implementation can reduce the Heat Ingress only by few percentage points. This one point can be either Heat reflective paint, or Power less Roof Vents, Obsolete Passive cement exhaust, N type ventilator,etc. But this one step towards heat reduction will not solve the industry roof heat ingress.

2. So it is better to add to the existing heat reduction proposal, to introduce forced air movement inside the attic area. This can be the above Lateral High volume Low pressure Axial flow fans which consume 1 HP to few HP only but giving Lakhs of CMH at the cost of Low static pressure.

3. In the textile humidification plant, we provide positive supply air CFM that is 20 % more than the Exhaust cfm. Similarly we provide Fresh Air Suction fan / fans at one end of attic and Exhaust fan /fans at the opposite direction of the attic area, taking care of wind direction in the area. This will increase the air movement in the attic and the heat ingress to the false ceiling comes down by some percentage points.

4. The latest trend in the Transient lightning surge protection is not by the Passive old type copper rod lightning arrestor but by the Early Streamer Emission Devices which actively grab the lightning impulses from the sky and earth the same thro the Maintenance Free Earthing Electrodes. The industry has adapted to this due the recent trends in the nonlinear Electronic loads that are overtaking the linear Electric loads now.

5. Similarly, we have to ensure stage wise reduction in Solar Heat Ingress that too by forcing the positive air movement and not expecting that the hot stale air will move out and above automatically. This will happen but it will be partial and gradual only. With this roaring ambient temp above 40 *C, it is better to concentrate on the attic comfort now. Force more air changes there to achieve better heat reduction now.

6. This application very much suits to many textile spinning mill segment, and in the industries where the Solar Heat is retained at the attic for longer hours of the day till the next day morning. The above implementation will reduce the heat ingress holding at the attic for late hours of the day.

CONCLUSION:-

The Solar Heat Ingress can be reduced on the Industry Inverted V type roofs, Building open terrace etc. That is why energy conscious people prefer to put a simple ridge type ventilator on their domestic Split AC out door open terrace units, AC package out door condenser areas. You will be surprised why the massive LED bulbs movement hit a barrier and fail more often, brightness reduces fast in the Municipal street lighting because this LED heat emitting outer junction also needs a tiny top ridge ventilator on its top. Since the same is exposed under the Sun throughout the day, this results in accelerated ageing of street light LED lighting. In short, it is lower cost to prevent the Solar Heat Ingress to the industry and building segment. Than allowing the heat to dissipate inside the industry and building and then we have to spend more to reduce the extra heat crept inside the premises.

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