There is currently an increasing trend in Europe to build passive houses. In order to reduce the cost of installation, an air-heating system may be an interesting alternative. Heat supplied through ventilation ducts located at the ceiling was studied with computational fluid dynamics technique. The purpose was to illustrate the thermal indoor climate of the building. To validate the performed simulations, measurements were carried out in several rooms of the building. Furthermore, this study investigated if a designed passive house located above the Arctic Circle could fulfil heat requirements for a Swedish passive house standard. Our results show a heat loss factor of 18.8 W/m2 floor area and an annual specific energy use of 67.9 kWh/m2 floor area, would fulfils the criteria. Validation of simulations through measurements shows good agreement with simulations if the thermal inertia of the building was considered. Calculation of heat losses from a building with a backward weighted moving average outdoor temperature produced correct prediction of the heat losses. To describe the indoor thermal climate correctly, the entire volume needs to be considered, not only one point, which normally is obtained with building simulation software. The supply airflow must carefully be considered to fulfil a good indoor climate.
MagnussonMKindellSMalmstenSAspMBergströmSWernL.Lokalklimat Kiruna, RAPPORT NR 9. Norrköping: Swedish Meteorological and Hydrological Institute, 2012 [in Swedish].
5.
BadescuVSicreB.Renewable energy for passive house heating: II. Model. Energ Buildings. 2003;
35: 1085–1096.
6.
RohdinPMolinAMoshfeghB.Experiences from nine passive houses in Sweden – Indoor thermal environment and energy use. Build Environ. 2014;
71: 176–185.
7.
SartoriIHestnesAG.Energy use in the life cycle of conventional and low-energy buildings: a review article. Energ Buildings. 2007;
39: 249–257.
8.
GaoRLiAZhangOZhangH.Comparison of indoor air temperatures of different under-floor heating pipe layouts. Energy Convers Manag. 2011;
52: 1295–1304.
9.
ChenQ.Comfort and energy consumption analysis in buildings with radiant panels. Energ Buildings. 1990;
14: 287–297.
10.
FeistWSchniedersJDorerVHaasA.Re-inventing air heating: Convenient and comfortable within the frame of the Passive House concept. Energ Buildings2005;
37: 1186–1203.
11.
EN ISO 7730:2005. Moderate thermal environments – determination of the PMV and PPD indices and specification of the conditions for thermal comfort. Brussels: Committee for Standardization (CEN), 2005.
12.
LiuZZhuZZhuYXuWLiH.Investigation of dust loading and culturable microorganisms of HVAC systems in 24 office buildings in Beijing. Energ Buildings. 2015;
103: 166–174.
13.
LiuZLiAHuZSunH.Study on the potential relationships between indoor culturable fungi, particle load and children respiratory health in Xi’an, China. Build Environ. 2014;
80(1):105–114.
14.
NielsenPV.Fifty years of CFD for room air distribution. Build Environ. 2015;
91: 78–90.
15.
MyhrenJAHolmbergS.Flow patterns and thermal comfort in a room with panel, floor and wall heating. Energ Buildings. 2008;
40: 524–536.
16.
GilaniSMontazeriHBlockenB.CFD simulation of stratified indoor environment in displacement ventilation: Validation and sensitivity analysis. Build Environ. 2016;
95: 299–313.
17.
ChiangWHWangCYHuangJS.Evaluation of cooling ceiling and mechanical ventilation systems on thermal comfort using CFD study in an office for subtropical region. Build Environ. 2012;
48: 113–127.
18.
RisbergDVesterlundMWesterlundLDahlJ.CFD simulation and evaluation of different heating systems installed in low energy building located in sub-Arctic climate. Build Environ. 2015;
89: 160–169.
19.
AryalPLeephakpreedaT.CFD analysis on thermal comfort and energy consumption effected by partitions in air-conditioned building. Energy Procedia. 2015;
79: 183–188.
20.
AwbiHB.Calculation of convective heat transfer coefficients of room surfaces for natural convection. Energ Buildings. 1998;
28: 219–227.
21.
BajcTTodorovićMNSvorcanJ.CFD analyses for passive house with Trombe wall and impact to energy demand. Energ Buildings2015;
98: 39–44.
22.
FokaidesPAChristoforouEIlicMPapadopoulosA.Performance of a Passive House under subtropical climatic conditions. Energ Buildings2016;
133: 14–31.
23.
KarlssonJFMoshfeghB.Energy demand and indoor climate in a low energy building – changed control strategies and boundary conditions. Energ Buildings2006;
38: 315–326.
24.
MengXWangYLiuTXingXCaoYZhaoJ.Influence of radiation on predictive accuracy in numerical simulations of the thermal environment in industrial buildings with buoyancy-driven natural ventilation. Appl Therm Eng2016;
96.
25.
RisbergDRisbergMWesterlundL.CFD modelling of radiators in buildings with user-defined wall functions. Appl Therm Eng2016;
94: 266–273.
26.
Sveriges Centrum för Nollenergihus. Kravspecification för nollenergihus, passivhus och minienergihus. FEBY 12, 2012.
27.
PericaultYRisbergMVesterlundMHedströmAViklanderM.A novel freeze protection strategy for shallow buried sewer pipes: temperature modelling and field investigation. Water Sci Technol2017;
76: 294–301.
28.
EN ISO 15927-5:2004. Hygrothermal performance of buildings – calculation and presentation of climatic data – part 5: Data for design heat load for space heating.
Brussels:
Committee for Standardization (CEN); 2004.
29.
LevinP. Brukarindata för energiberäkningar i bostäder. SVEBY, Tech. Rep., 2009.
ANSI ASHRAE Standard 55-2013. Thermal environmental conditions for human occupancy. Atlanta: American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE); 2013.
32.
BBR Swedish Building Regulations, www.boverket.se/ (accessed 1 November 2017).
LockwoodFCShahNG. A new radiation solution method for incorporation in general combustion prediction procedures. In: Proceedings 18th international symposium on combustion, Waterloo, Canada, August 17–22 1981; pp.1405–1414.
35.
RisbergDWesterlundLHellströmJGI.CFD-simulation of indoor climate in low energy buildings computational setup. Therm Sci2017;
21: 1985–1998.
36.
RoachePJ.Perspective: a method for uniform reporting of grid refinement studies. J Fluids Eng1994;
116: 405–413.
37.
ZhuangRLiXTuJ.CFD study of the effects of furniture layout on indoor air quality under typical office ventilation schemes. Build Simul2014;
7: 263–275.
38.
RisbergDVesterlundMWesterlundLDahlJ. CFD simulations of the indoor climate of a low energy building in a sub-Arctic climate: an evaluation of different heating systems. In: Proceedings of the international conference on sustainable energy technologies, Hong Kong, China, August 26–29 2013.
39.
ElshafeiGNegmABadyMSuzukiMIbrahimMG.Numerical and experimental investigations of the impacts of window parameters on indoor natural ventilation in a residential building. Energ Buildings. 2017;
141: 321–332.
