The weather has changed now. We no longer need a water-cooler to keep us comfortable in the hot days. The spell of cold has started showering. The scorching heat of summer days seems to be far behind. Only a few weeks ago, mercury has risen to record-breaking height. But now, the weather is much soothing and cool. We have got relieved from a prolonged uncomfortable weather.
However, because you are experiencing cold weather, it does not imply that you can forget the issues related to this heat. Designers are often worried about overheating of buildings. Now, why are some buildings extremely heated? There are certain factors contribute to this excessive heating of buildings.
Factors Responsible for Overheating of Any Building
There are a number of factors that causes the risk of overheating.
- Firstly, modern houses have glass doors and windows. To create transparency in the room, ceilings can also be of glass. Due to this extensive use of glasses in any building, it gets extremely heat during the summer times.
- Moreover, there is hardly any natural ventilation system in any building. Modernization is creating more danger to a structure.
- Again, the community heating system is responsible for overheating of a building.
If all these things are taken care of, then you can overcome the problem of overheating of buildings. Do you know that health risk of people living in such overheated buildings is also high? They suffer sleep deprivation, stress and can even face premature death.
Committee on Climate Change has estimated that every year deaths from overheating can rise from 2000 in 2015 to 7000 by 2050.
A New Memorandum from CIBSE
A technical memorandum named TM59 is issued by CIBSE addressing how complex the response of buildings is to external temperature. This memorandum also presents a standard methodology to the industry for assessing overheating risk. They say that building designers have to essentially check this to avoid future issues.
According TM59, designers have to conduct stimulations on the basis of 24-hour occupancy. Susie Diamond, co-author of TM59, says, “Lifestyles change – it is now reasonable to assume that people might be at home during the day, so the design needs to be fit for purpose and acceptable at all times.”
Researchers conducted live test where they found that if glazing quality on some facades is changed then overheating can be reduced. For instance, windows opening to balconies can be fitted to have improved ventilation, internal blinds can be installed, corridor pipes should be insulated and ventilated cupboards can be used.
GLA or Greater London Authority has presently reviewed its guidance to adopt TM59 methodology. Local authorities are also expected to walk on the same path.
Difference between CIBSE TM52 and TM59
TM52 is the current guidance of GLA and TM59 is its future guidance. TM59 takes into account wider impact of summer temperatures in future years as contrary to Design Summer Year, the current practice. This implies that schemes have to be designed in such a way that it can cater to extreme weather condition and can also mitigate the problem of overheating.
For this, careful planning is required on size and type of window opening, shading devices, ventilation, glazing, etc.
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