scholarly journals Thermal Comfort and Energy Consumption Using Different Radiant Heating/Cooling Systems in a Modern Office Building

2017 ◽  
Vol 25 (2) ◽  
pp. 33-38
Author(s):  
Ema Nemethova ◽  
Werner Stutterecker ◽  
Thomas Schoberer
Keyword(s):  
Energy Consumption ◽  
Thermal Comfort ◽  
Transition Period ◽  
Office Building ◽  
Time Intervals ◽  
Cooling Systems ◽  
Near Surface ◽  
Representative Office ◽  
Normative Criteria ◽  
Portable Sensor

Abstract The aim of the study is to evaluate the potential of enhancing thermal comfort and energy consumption created by three different radiant systems in the newly-built Energetikum office building. A representative office, Simulation room 1/1, was selected from 6 areas equipped with portable sensor groups for the indoor environment monitoring. The presented data obtained from 3 reference weeks; the heating, transition and cooling periods indicate overheating, particularly during the heating and transition period. The values of the indoor air temperature during the heating and transition period could not meet the normative criteria according to standard EN 15251:2007 (cat. II.) for 15-30% of the time intervals evaluated. Consequently, a simulation model of the selected office was created and points to the possibilities of improving the control system, which can lead to an elimination of the problem with overheating. Three different radiant systems - floor heating/ cooling, a thermally active ceiling, and a near-surface thermally active ceiling were implemented in the model. A comparison of their effects on thermal comfort and energy consumption is presented in the paper.

scholarly journals Thermal Comfort and HVAC Systems Operation Challenges in a Modern Office Building – Case Study

2016 ◽  
Vol 11 (2) ◽  
pp. 103-114 ◽  
Author(s):  
Ema Nemethova ◽  
Werner Stutterecker ◽  
Thomas Schoberer
Keyword(s):  
Indoor Environment ◽  
Transition Period ◽  
Control Strategies ◽  
Office Building ◽  
Cooling Period ◽  
Critical Areas ◽  
System Improvement ◽  
Normative Criteria ◽  
Environment Parameters ◽  
Portable Sensor

Abstract The aim of the study is to evaluate the indoor environment conditions in the new-built office building, Energetikum, and consequently suggest the control strategies, which can lead to determination of critical areas and elimination of thermal discomfort. Representative offices have been selected and equipped with portable sensor groups for monitoring of the indoor environment parameters. Contribution is presenting the data obtained from 6 selected rooms during 3 reference weeks - heating, transition and cooling period. The measured results indicate overheating of the rooms, particularly in the ones with the large glazed areas with higher solar gains. The values of indoor air temperature during heating and transition period could not meet the normative criteria according to standard EN 15251:2007 (the cat. II.) during 13 % - 49 % of evaluated time intervals. Consequently, the simulation model of the selected office was created and is pointing to the possibilities of the control system improvement, which can lead to an elimination of the problem with overheating.

scholarly journals Analysis of the Effect of Using External Venetian Blinds on the Thermal Comfort of Users of Highly Glazed Office Rooms in a Transition Season of Temperate Climate—Case Study

Energies ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 81 ◽  
Author(s):  
Małgorzata Fedorczak-Cisak ◽  
Katarzyna Nowak ◽  
Marcin Furtak
Keyword(s):  
Energy Consumption ◽  
Thermal Comfort ◽  
Ambient Air ◽  
Temperate Climate ◽  
Cooling Systems ◽  
Clothing Insulation ◽  
Transition Season ◽  
Venetian Blinds ◽  
Research Task ◽  
Office Rooms

Improving the energy efficiency of buildings is among the most urgent social development tasks due to the scale of energy consumption in this industry. At the same time, it is essential to meet high requirements for indoor environmental quality and thermal comfort. The issue of overheating is most often analysed in summer but it also occurs in transition seasons, when the cooling systems do not operate. The paper attempts to evaluate the effectiveness of external mobile shading elements on the microclimate of rooms with large glazed areas in the transition season. Passive solutions, such as shading elements, which limit the increase of indoor temperature, do not always allow the acquisition and maintenance of comfortable solutions for the duration of the season, as demonstrated by the authors. Temporary cooling of the rooms may be necessary to maintain comfortable conditions for the users, or other solutions should be devised to improve comfort (e.g., reduction of clothing insulation characteristics). The novelty of the study consists in the analysis of comfort in a “nearly zero energy consumption” building (NZEB) during a period not analyzed by other scientists. This is a transition period during which heating/cooling systems do not operate. The research task set by the authors involved the assessment of the possibility to reduce office space overheating in the transition season (spring) by using external shading equipment in rooms with large glazed areas. An additional research task aimed at checking the extent to which user behaviour, such as reduction in clothing insulation characteristics, can improve comfort in overheated rooms. The results of the tests reveal that the difference in the ambient air temperature between a room with external venetian blinds and an identical room with no venetian blinds in the transition season, i.e., from 27 March to 6 April 2017, ranged from 12.3 to 2.1 °C. The use of a shading system (external venetian blinds positioned at an angle of 45°) reduced the number of discomfort hours by 92% (during working hours) compared to the room without external venetian blinds. A reduction in the thermal insulation of the clothes worn by people working in the room with no venetian blinds helped to reduce the number of discomfort hours by 31%.

scholarly journals Seasonal Performance Analysis of Three Air Cooling Systems for School Buildings

2021 ◽  
Vol 9 (1) ◽  
pp. 14
Author(s):  
María Jesús Romero-Lara ◽  
Francisco Comino ◽  
Manuel Ruiz de Adana
Keyword(s):  
Energy Consumption ◽  
Thermal Comfort ◽  
Climatic Conditions ◽  
Air Cooling ◽  
School Buildings ◽  
Direct Expansion ◽  
Cooling Systems ◽  
Seasonal Performance ◽  
Evaporative Cooler ◽  
Conventional Systems

Efficient air cooling systems for hot climatic conditions, such as southern Europe, are required. Regenerative indirect evaporative cooler (RIEC) and desiccant regenerative indirect evaporative cooler (DRIEC) could be interesting alternatives to direct expansion conventional systems (DX). The main objective of this work was to evaluate the seasonal performance of three air cooling systems in terms of thermal comfort, ventilation and energy consumption. DRIEC was the recommended system to serve a standard classroom in terms of thermal comfort and RIEC in terms of ventilation and energy consumption.

scholarly journals Seasonal Analysis Comparison of Three Air-Cooling Systems in Terms of Thermal Comfort, Air Quality and Energy Consumption for School Buildings in Mediterranean Climates

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4436
Author(s):  
María Jesús Romero-Lara ◽  
Francisco Comino ◽  
Manuel Ruiz de Adana
Keyword(s):  
Energy Consumption ◽  
Air Quality ◽  
Thermal Comfort ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Mediterranean Area ◽  
Climatic Conditions ◽  
Air Cooling ◽  
Cooling Systems ◽  
Climate Zones

Efficient air-cooling systems for hot climatic conditions, such as Southern Europe, are required in the context of nearly Zero Energy Buildings, nZEB. Innovative air-cooling systems such as regenerative indirect evaporative coolers, RIEC and desiccant regenerative indirect evaporative coolers, DRIEC, can be considered an interesting alternative to direct expansion air-cooling systems, DX. The main aim of the present work was to evaluate the seasonal performance of three air-cooling systems in terms of air quality, thermal comfort and energy consumption in a standard classroom. Several annual energy simulations were carried out to evaluate these indexes for four different climate zones in the Mediterranean area. The simulations were carried out with empirically validated models. The results showed that DRIEC and DX improved by 29.8% and 14.6% over RIEC regarding thermal comfort, for the warmest climatic conditions, Lampedusa and Seville. However, DX showed an energy consumption three and four times higher than DRIEC for these climatic conditions, respectively. RIEC provided the highest percentage of hours with favorable indoor air quality for all climate zones, between 46.3% and 67.5%. Therefore, the air-cooling systems DRIEC and RIEC have a significant potential to reduce energy consumption, achieving the user’s thermal comfort and improving indoor air quality.

scholarly journals An overview on passive cooling systems in green building architectures

2019 ◽  
pp. 01-15
Author(s):  
Jani DB
Keyword(s):  
Energy Consumption ◽  
Thermal Comfort ◽  
Heat Dissipation ◽  
Green Building ◽  
Passive Cooling ◽  
High Grade ◽  
Cooling Systems ◽  
Mechanical Methods ◽  
Passive Cooling Systems ◽  
The Impact

The continuous progressive demand of building construction raises many issues regarding supply of high grade electricity. It creates many environmental issues for its production like as global warming. So, the passive cooling buildings were welcomed to respond variable climate in order to reduce energy supply for thermal comfort as well as health of building users. The aim of designing a passive building is to take best advantage of the regional outdoor ambient conditions. Passive cooling refers to a building architectural approach that mainly goal on heat gain control and heat dissipation in a architectural structure in order to ameliorate the indoor thermal comfort with low or nil energy consumption. Passive cooling systems use non-mechanical methods to sustain a comfortable indoor temperature and are a main aim in extenuating the impact of buildings on the regional environment. The energy consumption in buildings is very much with the anticipation to further increase because of improving standards of leaving and the increase of industrialization. The use of HVAC in building has exponentially rises over the past few decades and quite enough to contribute in the enormous use of high grade electrical energy consumption. This paper reviews various passive cooling techniques used in the green building and their role in providing thermal comfort and its significance in energy conservation with the help of architectural interventions.

Effects of double glazed facade on energy consumption, thermal comfort and condensation for a typical office building in Singapore

2005 ◽  
Vol 37 (6) ◽  
pp. 563-572 ◽  
Author(s):  
Wong Nyuk Hien ◽  
Wang Liping ◽  
Aida Noplie Chandra ◽  
Anupama Rana Pandey ◽  
Wei Xiaolin
Keyword(s):  
Energy Consumption ◽  
Thermal Comfort ◽  
Office Building ◽  
Glazed Facade
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