Passive cooling strategies include:
• Natural ventilation
• Structural thermal mass to absorb daytime heat loads
• Night cooling so that the structure can take up heat during the day
• Culvert ventilation to take up ground cooling However, passive cooling has limitations:
• It is not possible to maintain specific thermal conditions, so flexibility and some high temperatures must be acceptable.
• Only cooling loads up to about 40 W/m2 can normally be handled passively, then mechanical systems are required.
When it is necessary to provide tighter control of room temperatures and humidity - for example, manufacturing processes and museums - a mechanical cooling system will often be required. This can be achieved using a variety of benign low-energy mechanical techniques.
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