Experimental Measurement of the Accumulated Heat from the Operation System of the Heating in a Building with a Lightweight Envelope

Abstract

The heating and cooling of buildings with large-scale ceiling systems nowadays is widely used in traditional as well as in new, low-energy buildings. This type of system is being employed in a building of the Civil Engineering Faculty (FCE), Slovak Technical University, in Bratislava. The building’s refurbishment in 2010 included the complete replacement of the building’s envelope. The replacement is a lightweight facade with a high percentage of transparent construction. Due to the differences between the type of envelope and the heating system, the operation of the heating system frequently causes thermal discomfort, especially during warm spring or autumn days. The aim of the measurements was to evaluate the control of the operation of the heating output, the appropriateness of the location of sensors measuring the outdoor temperature and possible improvement of the current control system to improve the heating system’s quality.

Heat storage efficiency and effective thermal output: Indicators of thermal response and output of radiant heating and cooling systems

“…The response time of these systems is higher than that of convective systems and may be as high as tens of hours [8,9,10]. This, in combination with frequent changes in weather conditions and internal heat gains, requires using precise control strategies to fulfil the criteria on thermal comfort [11,12,13,14]. Knowing the thermal response of the radiant systems is therefore crucial to determine an efficient control strategy.…”

Possibilities of combining radiant wall cooling with ejector cooling cycle powered by Fresnel solar collectors

“…Another potential advantage of the radiant systems is the possibility to store cool in their thermal mass which would allow turning off the cooling aggregates during peak loads. The cool can be generated and stored during night time when the electricity price is lower than during the day [16][17][18]. It can also help prevent exceeding the maximum permissible electricity peak outputs.…”