Evaluation of Indoor Environment Subjective Perception in Large Office Building

Office buildings are significant contributors to energy consumption and greenhouse emissions, and it is obvious that office building occupants and their behavior play an essential role in building energy performance. However, how buildings, respectively, their indoor environment, influence building occupant´s behavior, wellbeing, and productivity is not so clear and easy to predict. The main problem is that this correlation is very subjective and influenced by many factors.

A longitudinal field study of thermal comfort and air quality in naturally ventilated office buildings in UK

Natural ventilation has the potential to provide cooling and fresh air and cut 40% of the total energy consumption of European office buildings. While in the milder seasons natural ventilation is an obvious low-energy choice, if poorly designed it can cause overheating in summer and poor air quality in winter. In order to promote the use and design of naturally ventilated (NV) buildings, it is therefore important to understand how current NV buildings perform in terms of thermal comfort and indoor air quality.

Performance of mixed-mode cooling strategies for office buildings in arid climates

Mixed-Mode ventilation is an innovative approach that maximizes the use of natural ventilation and uses supplementary mechanical cooling only when strictly required. The application of Mixed-Mode ventilation in severe arid climates and its integration with other passive cooling strategies is very challenging and has not been systematically studied. The paper will present an evaluation of the performance of different Mixed-Mode cooling strategies for a single-zone office space in four main arid cities that represent the diversity in arid climates.

Sensitivity study for architectural design strategies of office buildings in central Chile: Effectiveness of nocturnal ventilation

Office buildings in Chile show higher cooling than heating energy demand. The climate of the country show important differences between cities by the ocean and those of interior regions, located between the coastal and the Andes range. Main cities of Central Chile, where more than 40% of buildings are constructed every year are Santiago and Valparaíso, both located at around 33° S. Santiago presents a Mediterranean climate, with a high temperature oscillation between day and night during cooling period.

Ventilated Active Façades to Reduce the Cooling Demand of Office Buildings - the Case of Spain

This paper analyses the energy efficiency of a Ventilated Active Façade (VAF) applied to office buildings in Spain in comparison with conventional façades that comply with the minimum energy requirements of the Spanish Technical Building Regulation (Código Técnico de la Edificación - CTE). The analysis considers the climatic diversity of the 12 climatic zones of Spain. The studied VAF consists of an outer layer element of 2 mm galvanized steel panels and a 3 cm air cavity through which the ventilation air is preheated in winter and exhausted in summer.

COMFORT COMPLAINTS IN OFFICE BUILDINGS LESSONS LEARNT FROM TWO CASE STUDIES

Air conditioning in offices has become current practice in North Western Europe. Main reasons are thehigh internal loads and solar gains. That move away from the heated, naturally ventilated cellularoffice increased comfort complaints.Two cases are presented, confronting enquiry results with measurements. In both, the enquiries gavea number of dissatisfied at the noted mean vote much higher than the standard PMV/PPD curvesuggests. Measurements in turn showed that only in one of the two case complaints could beexpected.

Modeling of electrochromic glazing switching control strategies in micro-DOE-2.1E

This paper aims to advance the knowledge related to the simulation of electrochromic glazing switching control. First, a critical evaluation of existing control strategies currently available in the DOE-2.1E program was performed to study the effect of several driving variables on the cooling load of an existing large office building. Second, the present capabilities of the DOE-2.1E program were expanded using the Functional Values approach which enables the user to introduce new algorithms (e.g., control strategies) without recompiling the program.

Assessment of Adaptive Thermal Algorithm in Office Buildings

Being the largest energy consumer, building sector represents a major stake for the actualenvironmental concerns. So far, building thermal comfort standards are based on static models thatdont account for the interaction between occupants and their living places. The adaptive approach of the thermal comfort has the advantage to be more comprehensive and realistic, and its application would result in energy saving in buildings. Recently, an Adaptive Control Algorithm ACA and an Adaptive Comfort Standard ACS have been developed on the adaptive approach.

Energy Efficient Office Buildings with Passive Cooling Results from a Research and Demonstration Programme

To gain access to information on energy use in office buildings, the German Federal Ministry forEconomy launched an intensive research and demonstration programme in 1995. In advance of theEU energy performance directive a limited primary energy coefficient of about 100 kWh m-2a-1 as agoal for the complete building services technology was postulated (HVAC + lighting) for alldemonstration buildings. A further condition was that active cooling be avoided.

Consequences of Increasing Insulation on the Annual Energy Consumption of Air-Conditioned Office Buildings

The aim of this work is to study the influence of global heat transfer coefficient (Utot en W/m2.K) of the opaque walls (walls and roofs) and of the glazed walls (bays) on the annual consumption of heating, cooling and overall consumption energy. We analyze the number of hours of heating and cooling under operation with partial load and full load. Profiles of indoor temperatures are also given. The work is established on several office buildings defined according to a typology built within the framework of a study on energy savings in air-conditioned office buildings in France.

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