Ventilation systems for baking hall

Bakery halls  normally have ovens installed in it  .Special attention needs to be given for ventilation in the baking hall . Roof are  designed in such a way that it  helps in natural ventilation.  The temperatures in these halls touches 50- 55 deg c in summer in some places  which makes condition difficult for bakers and operators to work  in these condition .

Normally bigger plants with more than two or three units placed in  the same hall s  have more problem than a single unit . Ensure that the roof height are something between 30 - 35 ft  from the ground level  and have ample space for heat to disperse .

Following methods are used to  for  ventilation

Forced  Ventilation
 Axial  fans are installed at the roof  with capacities  matching the  hall dimensions .  fans are installed in the walls  as well roof  supported on the trusses and wall . structure needs to be erected for installation , repair and dismantling of these fans .This methods consume more energy as axial fans are drive by motors .

Natural ventilation

Roof are designed such a way that  it helps  natural ventilation  . series of wire mesh is fixed in the entire length which allows hot air to escape through it  and preventing dust other foreign bodies to go inside the  hall . fans can be installed which can use the hot airs  to run itself hence creating draft for air to escape to the atmosphere  through roof .

Few general steps for energy saving in bakery plants

Following steps  can  be taken with minimum ofinvestment to save energy in big to medium bakeries .
 Automated Bakeries  now have better and bigger equipments which consume more energy . Human comfort had made bakeries investing in HVAC  utilities .  Process requirements  requires boilers and compressors .

Lighting:


Reduce mounting height

Timer for outside lighting to be changed according to season

Cleaning of Translucent sheet and window

Switch off lighting during lunch hours and when not in operation.

Clean luminaries

Provide task lighting in packing area

Use T5 lamps for future replacement

Specular reflectors for administration block

Use Maximum Day lighting

Give infrared controlled switching circuit

Increase mounting height of Sodium vapour lamp near to outside storage

Compressed Air system:

Conduct leakage test regularly

Reduce set pressure of compressed air system

Provide gun for cleaning operation

Use low pressure air for cleaning

Misuse of compressed air such as body cleaning, floor cleaning must be discouraged.

Air Conditioning


Provide temperature thermostat control

Give accessibility

Regular cleaning of filters/evaporators

Provide fast acting door

Provide Water curtains for condenser

Automatic control for A.C.operation

Increase air flow circulation

Oven

Monitor flue gas parameters for  oven lines

Monitor fuel  consumption of each line of oven



Electrical system

Installation of Harmonic filters

Automatic power factor control (APFC) for all transformers