Lighting is a substantial energy consumer, and a major component of the service costs in manybuildings. Lighting renovation was done on the Department of Electrical and CommunicationsEngineering at the Helsinki University of Technology. The lighting in the renovated auditorium wasalmost 40 years old. New lamps with electronic ballast are more energy efficient and the ballast lossesare smaller. Also the optical properties of the new luminiares have been greatly improved. This papershow the results obtained in one auditorium.
High energy savings can be expected from building energy and climate concepts which combinethe heat pump technology with a low temperature energy distributions such as concrete corewater pipe circuits within building zones. The paper describes two case studies of a heat pumpplant for heating and cooling of nonresidential buildings. For concept comparison purposes aglobal objective function will be developed in the frame of IEA-ECBCS Annex 48 and has beenpartially tested by using project constrains, thermal comfort expectations and lifecycle costs of thefoccused case studies.
The IEA, section ECBCS (Energy Conservation in Buildings and Community systems), has launched the project Annex 45 ‘Energy Efficient Electric Lighting for Buildings’, of which subtask B deals with innovative technical solutions. Part of the work is to def
We have conducted a campaign of testing efficient lighting installations during 6months in the area of Lyon, France. 26 work places were tested, each of them with aspecific lighting scheme. The goal was to identify directions in preferred lightingschemes requiring less electrical power. Users could adjust their lighting conditionsthanks to different control systems : dimmer, daylight and occupancy sensors,separate ambient/task luminaires.
Even if the quality and durability of active solar systems equipments are henceforth ensured, there arestill some considerable barriers to the development of their market, in particular their architectural andtechnical integration to the buildings. Our research aims at studying, designing and realizing astructural component of building ensuring in a permanent and integrated way the set of functionsnormally provided by elements of faade and by thermal liquid-cooled collectors. The product isintended to be distributed and implemented by building professionals.
This paper presents an analysis of the transient thermal performance of dynamic insulation. A modelbased on heat transfer through porous media is introduced, considering two types of boundaryconditions: (1) indoor temperature and outdoor temperature are constant; (2) indoor temperature isconstant while outdoor temperature changes. By solving the model numerically, it is found that for thefirst kind of boundary condition, the temperature profile in the wall will reach steady-state within onehour, when the porosity is high.
Because we spend most of our time in enclosed spaces, thermal comfort of buildings rose increasinglyand then energy consumption correspondingly is increased, aggravating the pollution of naturalenvironment. Integrating phase change materials (PCM) into building walls is a potential method ofreducing energy consumption in passively designed buildings. However, there is a strong need forexperimental data to evaluate the capacity of PCM to stabilize the internal environment when there areexternal temperature changes and solar radiations: that is the purpose of our article.
Important properties of the indoor air quality are temperature and humidity. Very often in new and oldbuildings the temperature is too high or varies too strongly. A suspended ceiling with phase changematerials has a good influence to avoid too high indoor air temperatures. An additional heat exchangerat the outside of the building can increase the efficiency of the system by working in the night andcooling down the phase change material, so that after this cooling the full heat storage capacity isattainable.
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