Abstract
It appears that the walls, insulated according to the new requirements for thermal resistance, can contribute to thermal stability. This is advantageous not only for the thermal comfort during the summer but in the cases of the intermittent heating, or overheating, as well. This article evaluates some alternatives of insulated and uninsulated external walls. The phase time shift of the indoor surface temperature with respect to the outdoor surface, together with the periodic penetration depth of indoor surface temperature, are considered in this analysis. Analyzing subsurface temperature courses we evaluate the ability of construction to accumulate heat gains, which can arise during the day.
Highlights
The criterion of thermal resistance is undoubtedly the important criterion in the process of the building material selection
The three wall configurations with four different insulation thicknesses are studied and presented: perforated brick wall (BR), heavy weight concrete wall (HC), porous concrete wall (PC) with thermal insulation made of expanded polystyrene (EPS) or mineral wool (MW)
By use of the thermal stability calculation and possibility of overheating, the internal heat capacity of the floor, ceiling and dividing walls is taken into account, as well as the measure of heat gains from internal sources and solar radiation
Summary
The criterion of thermal resistance is undoubtedly the important criterion in the process of the building material selection. According to Durica et al [1], the risk of overheating from the point of view of frequency (with a temperature over 25 oC) can occur in different kinds of passive house constructions. Nemecek solved similar problems in the passive house [2] In his contribution based on simulation calculations of summer overheating, he ranks an energy storage capacity of construction in the 4th place, according to the importance, behind heat gains from solar radiation, internal heat gains and ventilation regime. Stock of the heat accumulated in building construction during the period of overheating (ideally when the space is not being occupied) can be used to maintain the thermal stability during the cooler part of the day, as suggested by Wolisz [4]. The effect of internal heat gains is well known and described in details in the literature, e. g. [6]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
