Ventilation Indoor Climate

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  • Topic: HVAC, Rooms, Heat
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  • Published : April 18, 2013
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Indoor climate and ventilation
JENS PEDER PEDERSEN

Jens Peder Pedersen

Indoor climate and ventilation

INDOOR CLIMATE
Thermal indoor climate Air temperature, air velocity and air humidity Atmospheric indoor climate:

= Air quality: pollutions as dust, air humidity, gasses and smell The psychical environment

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Jens Peder Pedersen

Indoor climate and ventilation

INDOOR CLIMATE
Physical and chemical demands for the indoor climate

1. Suitable temperature 2. Suitable air humidity 3. Suitable air replacement 4. Suitable lighting conditions 5. Suitable sound conditions 6. Absence of negative indoor climate elements

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Jens Peder Pedersen

Indoor climate and ventilation

Negative indoor climate elements
1. Dust, breathable or non- breathable 2. Fibres, e.g. from textiles, mineral wool and asbestos 3. Biological material, e.g. fungus spores, alga, pollen, bacteria etc. 4. Smoke, e.g. from tobacco 5. Degassing, e.g. from building materials, inventory and cleaning materials 6. Obnoxious smells, e.g. from external environment 7. Entrances from the underground structure, e.g. radon or leaking out from chemical depots 8. Static electricity, e.g. because of floor coverings 9. Vibrations and heavy noise, e.g. from big machines or traffic Page 4

Jens Peder Pedersen

Indoor climate and ventilation

Principles for heating and ventilation systems

The above mentioned terms are what we use in connection with ventilation systems. Heating- and ventilation in connection with industrial buildings is different compared with, what we have been dealing with in the earlier semesters. It has been domestic buildings, where the demands for heating and ventilation normally can be found in the Building Regulations. When it is about other buildings than domestic buildings, we are referred to, that it should be approved by the local authorities in consideration of the size of the room and its use. Furthermore is referred to DS 447: Code of practice for ventilation systems.

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Jens Peder Pedersen

Indoor climate and ventilation

Analysis of heating and ventilation
In bigger buildings it will very often be necessary to make an analysis about, how the building and every single room should be heated and ventilated. Very often big rooms are in question, and radiators for heating are in this connection not the only solution. At the same time it is necessary to find out about, how big a ventilation requirement every single room has, and how the ventilation can be made. When heating and ventilation have to be analysed, it can be an idea to divide the rooms into the following categories: “Nice rooms” ”Nice rooms” should be understood as rooms, where the activities in the rooms will not cause any special pollution. The rooms can be: offices, meeting rooms, canteens etc. Nice rooms with normal room height: A typical heating/ventilation solution in such rooms could be: • •

Heating: radiators Ventilation: comfort ventilation (air inlet and extraction) ventilation unit with heat-recovering (cross flow heat exchanger or rotary heat exchanger)

Big nice rooms with big ceiling height/room height: Typical heating/ventilation solutions in such rooms could be: •

Heating by injection of warm air from ventilation system with heatrecovering

or


Radiant heat combined with ventilation from ventilation system with heat-recovering

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Jens Peder Pedersen

Indoor climate and ventilation

"Polluted rooms" ”Polluted rooms should be understood as rooms, where the activities in the rooms cause some pollution and where the comfort demand is not particular high. The rooms can be: workshops, production premises, storerooms etc. Rooms of this type will often be rooms with big room height: Typical heat/ventilation solutions in such rooms could be: • •

Space heaters Warm air heaters

or


Regular ventilation system with heated air inlet, extraction and heatrecovering

or
•...
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