comfort and the indoor climate

8/3/2019 Comfort and the Indoor Climate

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Comfort and the indoor climate

The climatic conditions inside a buildingdepend primarily on the conditions

prevailing outside and the people andprocess housed within. however manyadditional factor can mediate the effect ofthe exterior conditions on those indoors.


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Building design and the indoorclimate. Building design determines the amount of solar

penetration into the building and the radiant heatgain. The amount of insulation, particularly of theroof, has a large influence on the heat exchange

between the building and the environment

solar heat gain through uninsulated factory roofand walls is an important cause of overheating. this

is particularly important in developing countrywhere cost effective but thermally efficient buildingconcepts are needed.


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In hot country, roof insulation is an important firststep in combating overheating. parts of the building

that are exposed to direct sunlight can be paintedin in bright colour to reflect solar energy

Rectangular shape buildings can be constructed

with their long walls facing north/south. In thesummer the sun shines on the shorter walls in themorning and evening and on the roof during theday.

This minimize the degree of heating of the buildingby the sun. Conversely in the winter when the sunis low in the sky, the long walls and roof areexposed to the sun during the day. which helps towarm the building.


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Thermal comfort in buildings

The thermal comfort of a factory/office worker depends onthere being an average skin temperature of approximately33C.

modern approaches to the indoor climates have attemted to

specify an acceptable range of conditions for the worker.

ISO 9241reccomend winter temperature of 20C-24C andsummer temperature of 23-26C.

maximum value of relatiVE humidity are 60-80% at 20C,50-70% at 22C, 45-65% at 24C.

at temperature of 24C and above, workers may begin to feellethargic. At the temperature of 18C or lower, shivering may

commence in sedentary or inactive work unless extra clothingis worn.


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Ventilation

Ventilation is a determinant of thermal comfort and, moregenerally, of satisfaction with the indoor environment.

The purpose is to provided fresh air and to removedaccumulated noxious gases and contaminants.

Its helps to removed heat generated in a working area byconvection and cools the body.


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Thermal comfort Air Quality

Poor air quality can cause a varietyoccupational health problems rangingfrom temporary to long term effect.

Common problems associated with poor

air quality are allergic, respiratoryproblems, eye irritation, bronchitis, andsick-building syndrome (infested withairborne microorganisms).

Poor air quality is caused by poorventilation in closed working spaces likestunnel, ship tank, etc.


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Why Should Concern toIndoor Air Qualitya) Occupational health concern

- Avoid sick-building syndrome- Prevent eye, nose, and throat irritation.- Headache: difficulty in concentrating

b) Productivity concern- Poor indoor air quality can lead to loss of

productivity- Increase in employee absenteeism.- Loss of work hours, it estimated USD 3billion per year (ILO, 2004).


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Measurement of Indoor AirQuality


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Indoor AirQuality Monitor

comfort and the indoor climate

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