Tag Archives: air-conditioning

1614-1621 D.V. Cao and P. Kic
Analysis of indoor temperature in the workshop building during the summer: a pilot study
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Analysis of indoor temperature in the workshop building during the summer: a pilot study

D.V. Cao* and P. Kic

Czech University of Life Sciences Prague, Faculty of Engineering, Department of
Technological Equipment of Buildings, Kamýcká 129, CZ165 21, Czech Republic
*Correspondence: caodoan2006@gmail.com

Abstract:

The aim of this paper is the presentation of measurements’ results and the calculation
method for analysis and evaluation of climate conditions as well for using of natural illuminance
in two large simple buildings during summer which could be used to calculate power demand for
the air cooling to reduce the indoor temperature caused by solar radiation. In this research, we
carried out experiments of measuring the indoor temperature at level of working place which is
1.1 m, in two similar large workshops with floor area 260 m2 and height 6.5 m, during several
hot summer days. The indoor conditions were strongly influenced by the solar radiation as the
buildings have large wall and roof windows. The indoor air temperatures in the first building
achieved 39.5 °C, which caused the heat stress for workers. The indoor air temperatures in the
second building achieved only 29.5 °C. The calculated power demand for the air cooling to reduce
the indoor temperature to 25 °C is 25.6 kW in the first building, the cooling power for second
building is 14.9 kW. We investigated measured construction of the workshop and we set up the
formula in order to calculate thermal balance. The measurement results and calculated results in
two buildings are compared and summarized in the tables and in the graphs for analysis. As a
general conclusion, it must be said that solar radiation has a big influence on the air temperature
and methods of passive air-conditioning should be more applied also on the production buildings
in industry, agriculture and other branches of civil engineering to release heat increasing air
temperature inside the building.

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1771-1780 E. Merisalu, D. Mugur and P. Kic
Importance of microclimate conditions and CO2 control in educational buildings: a case study
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Importance of microclimate conditions and CO2 control in educational buildings: a case study

E. Merisalu¹*, D. Mugur¹ and P. Kic²

¹Estonian University of Life Sciences Tartu, Institute of Technology, Fr. R. Kreutzwaldi 56/1, EE51006 Tartu, Estonia
²Czech University of Life Sciences Prague, Faculty of Engineering, Department of Technological Equipment of Buildings, Kamýcká 129, CZ165 21 Prague, Czech Republic
*Correspondence: eda.merisalu@emu.ee

Abstract:

Current efforts to minimize energy losses and maximize energy savings for heating of all houses are most often gained by insulating facades and replacing windows. However, these measures can have a significant negative impact on human health and these problems can occur in buildings with a high concentration of people, such as school buildings. The aim of this paper is to analyse the results of measurements of air temperature, relative air humidity and carbon dioxide in winter period in the classrooms of two universities, Estonian University of Life Sciences (EULS) in Tartu and Czech University of Life Sciences (CULS) in Prague. The measurements have carried out in 2017-2018 in eight classrooms of the EULS and two classrooms of the CULS. The external and internal temperature, relative humidity and concentration of carbon dioxide have measured in the classrooms during a few days in the winter period. In the lecture rooms of CULS, when the air conditioning was off, the levels of CO2 exceeded the recommended levels about two times. The average internal temperature and CO2 concentrations in the classrooms of EULS follows the norms and refers on good ventilation. The extremely low relative humidity in the classrooms of EULS at 17.1 ± 2.6% refers to a high risk of allostatic load and respiratory symptoms among students. It is important to pay attention on regular ventilation and relative air humidity control in the teaching rooms, especially with high number of students to prevent seasonal sickness of upper respiratory tract.

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