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7/7/2020  
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R&D
Spanish churches

Heating can damage the artistic heritage, study finds


The antiquated heating systems in many Spanish churches create abrupt variations in temperature and humidity which can negatively affect the conservation of its artistic heritage, especially in tall ceiling areas. Also, as the heat rises, it takes time for the parishioners below to feel comfortable after the heating systems are turned on. These are the findings of an analysis conducted on a church in Madrid by researchers from the Institute of Geosciences (UCM-CSIC).
Ibercampus 10/4/2015 Send to a friend
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During the second half of the 20th century many Spanish churches installed heating systems blowing out hot air which ran on heating oil. Members of the Institute of Geosciences (UCM-CSIC) have now verified that their habitual and continual use destabilises the indoor climate of these buildings, negatively affecting the conservation of their heritage.

To carry out the study, published in the journals ‘Energy and Buildings’ and ‘Building and Environment’, the researchers have focused on a parish church model: that of San Juan Bautista in Talamanca del Jarama (Madrid). It has been declared a historic-artistic monument and is made up of different architectural styles, including Romanesque.

The microclimate has been recorded with various wireless monitoring systems, including the use of balloons to elevate the sensors, together with infrared thermography, hygrometry and electrical resistivity devices to measure the two critical parameters for conservation: temperature and humidity.

Parishioners do not immediately feel warm

The measurements have also confirmed that the heating equipment does not improve the temperature sensation for those few who usually attend these buildings on a daily basis. While they are seated during the religious service they do not notice a pleasant atmosphere until the heating has been on for a long period of time.

In tall ceiling areas the temperature increases more, and the humidity drops to dangerous levels for the heritage pieces.

The elevated temperatures start to concentrate in the higher areas and from there gradually drop to the lower areas. These temperatures control the relative humidity, and therefore in the higher areas the humidity drops to dangerous levels for the heritage items, while in the lower areas, the higher humidity is responsible for reduced heat sensation for the parishioners.

Only in special ecclesiastical celebrations, like some events at Easter, do the churches usually fill up and on these occasions the actual body heat of the crowds moderates the atmosphere, although this is not usual throughout the year. In the church at Talamanca, with the heating on and full of people, the temperatures have been seen to reach 15-17 ºC at the seating level, while they do not rise above 13 ºC if there are few parishioners.

In 2012 a piece of European legislation appeared with recommendations for placing heating in churches, chapels and other places of worship, “but their adaptation to Spain is still pending,” Varas-Muriel recognises.

Meanwhile, researchers recommend replacing the old heating systems with other newer and more efficient ones, although this solution is still being studied and is not within reach of many parishes for economic reasons.

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