The installation of heating systems in buildings and monuments not designed to accommodate such facilities poses technical difficulties, particularly where occupancy and hence system use is sporadic, such as in churches, cathedrals, synagogues, mosques and other places of worship. Furthermore, building materials and architecture may detract from system efficiency. An additional difficulty is the source of energy: when monuments are in remote areas, fuels such as natural gas may not be available, although on occasion they may not be used even when they are available. The present study explores the thermal comfort provided by heating systems generally used in Spanish churches: decentralized gas burner system (propane) and centralized air heating systems (natural gas, fuel oil) based on a new monitoring methodology using temperature, relative humidity and airflow sensors. The church at Talamanca de Jarama (fuel oil) delivered the highest thermal comfort based on environmental conditions, whereas the system installed at Algete (natural gas) was the most energy efficient. The requirements of each heating system were assessed relative to the conservation of the desired indoor conditions, considering energy, comfort and aesthetic factors.
YauYHChewBTSaifullahAZA. A field study on thermal comfort of occupants and acceptable neutral temperature at the national museum in Malaysia. Indoor Built Environ2013; 22: 433–444.
2.
CamuffoDPaganERissanenSBrataszLRoman KozłowskiRCamuffoMdella ValleA. An advanced church heating system favourable to artworks: a contribution to European standardization. J Cult Heritage2010; 11: 205–219.
3.
CamuffoD. Microclimate for cultural heritage. Conservation and restoration of indoor and outdoor monuments, 2nd ed. Amsterdam: Elsevier Science, Amsterdam, 2013.
4.
LipskaBTrzeciakiewiczZFerdyn-GrygierekJZbigniewP. The improvement of thermal comfort and air quality in the historic assembly hall of a university. Indoor Built Environ2012; 21: 332–347.
5.
ZhangHArensEPasutW. Air temperature thresholds for indoor comfort and perceived air quality. Build Res Inf2011; 39: 134–144.
6.
KaaseHAydinliSGrammS. Energy-efficient lighting in museums, taking conservation into account. Bauphysik2013; 35: 205–211.
7.
UNE-EN 15759-1: 2011. Conservation of cultural property, indoor climate, part 1: guidelines for heating churches, chapels and other places of worship, Madrid: AENOR, 2012.
8.
Varas-MurielMJMartínez-GarridoMIFortR. Monitoring the thermal–hygrometric conditions induced by traditional heating systems in a historic Spanish church (12th–16th C). Energy Build J2014; 75: 119–132.
9.
BurattiCRicciardiPVergoniM. HVAC systems testing and check: a simplified model to predict thermal comfort conditions in moderate environments. Appl Energy2013; 104: 117–127.
10.
DiasDMachadoJLealVMendesA. Impact of using cool paints on energy demand and thermal comfort of a residential building. Appl Thermal Eng2014; 65: 273–281.
11.
ANSI/ASHRAE Standard 55-2013. Thermal environmental conditions for human occupancy. American Society of Heating, Atlanta, Georgia: Refrigerating and Air-Conditioning Engineers (ASHRAE), 2013.
12.
UNE-EN ISO 7730: 2005. Ergonomics of the thermal environment. Analytical determination and interpretation of thermal comfort using calculation of the PMV and PPD indices and local thermal comfort criteria, Madrid: AENOR, 2006.
13.
RanaRKusyBJurdakRWallJHuW. Feasibility analysis of using humidex as an indoor thermal comfort predictor. Energy Build2013; 64: 17–25.
14.
UNI EN ISO 10551:2002. Ergonomics of the thermal environment – assessment of the influence of the thermal environment using subjective scales, Geneva: International Organization for Standardization, 2002.
15.
BragerGSde DearR. A standard for natural ventilation. ASHRAE J2000; 42: 21–28.
16.
SchellenLLoomansMGLCde WitMHOlesenBWvan Marken LichtenbeltcWD. The influence of local effects on thermal sensation under non-uniform environmental conditions – gender differences in thermophysiology, thermal comfort and productivity during convective and radiant cooling. Physiol Behav2012; 107: 252–261.
CandidoCLambertsRde DearRBittencourtLDe VecchiR. Towards a Brazilian standard for naturally ventilated buildings: guidelines for thermal and air movement acceptability. Build Res Inf2011; 39: 145–153.
19.
Martínez-GarridoMIAparicioSFortRAnayaJJIzquierdoMAG. Effect of solar radiation and humidity on the inner core of walls in historic buildings. Constr Build Mater2014; 51: 383–394.
20.
TaibNAbdullahAAliZFadzilSFSYeokFS. Trends in the air temperature of transitional spaces of a high-rise office building: the effects of season and location. Indoor Built Environ2014; 23: 1117–1128.
21.
LueckK. Energy efficient building services for tempering performance-oriented interior spaces – a literature review. J Cleaner Prod2012; 22: 1–10.
22.
Henricus Lambertus (Henk) Schellen. Heating monumental churches indoor climate and preservation of cultural heritage. Eindhoven: Technische Universiteit Eindhoven, 2002.
23.
López-ArcePFortRGómez-HerasMEPérez-MonserratEVaras-MurielMJ. Preservation strategies for avoidance of salt crystallisation in El Paular Monastery cloister, Madrid, Spain. Environ Earth Sci2011; 63: 1487–1509.
24.
YangLYanHLamJC. Thermal comfort and building energy consumption implications – a review. Appl Energy2014; 115: 164–173.
25.
Camuffo D and della Valle A. Church heating: a balance between conservation and thermal comfort, contribution to the experts’ roundtable on sustainable climate management strategies. Tenerife, Spain, April 2007.
26.
HumphreysMARijalHBNicolJF. Updating the adaptive relation between climate and comfort indoors; new insights and an extended database. Build Environ2013; 63: 40–55.
27.
NicolJFHumphreysMA. New standards for comfort and energy use in buildings. Build Res Inf2009; 37: 68–73.
28.
AuliciemsAThermal comfort. In: Nancy Ruck (ed). Building design and human performance, New York: Van Nostrand Reinhold, 1989, pp. 3–28.
29.
NicolFHumphreysM. Derivation of the adaptive equations for thermal comfort in free-running buildings in European standard EN15251. Build Environ2010; 45: 11–17.
30.
HumphreysMANicolJFRajaIA. Field studies of indoor thermal comfort and the progress of the adaptive approach. J Adv Build Energy Res2007; 1: 55–88.
31.
Varas-MurielMJFortRMartínez-GarridoMIet al.Fluctuations in the indoor environment in Spanish rural churches and their effects on heritage conservation: hygro-thermal and CO2 conditions monitoring. Build Environ2014; 82: 97–109.
32.
ShenglanJBaizhanLTanMHongL. Impact of relative humidity on thermal comfort in a warm environment. Indoor Built Environ2013; 22: 598–607.
33.
Thermal Comfort chapter. Fundamentals volume of the ASHRAE handbook, Atlanta, GA: ASHRAE, Inc., 2005.
34.
AntretterFMittererCYoungSM. Use of moisture-buffering tiles for indoor climate stability under different climatic requirements. HVAC Res2012; 18: 275–282.
35.
OlesenBW. International standards for the indoor environment. Indoor Air2004; 14: 18–26.
36.
Gomez-HerasMSmithBJFortR. Influence of surface heterogeneities of building granite on its thermal response and its potential for the generation of thermoclasty. Environ Geol2008; 56: 547–560.
