In this paper the energy performance and thepotentials of the energy savings decrease in twooffice buildings in northern Greece areexamined, within the frames of a renovationproject in office buildings of the public sector.Energy audits and simulations were performedfor this reason. Significant energy savings wereachieved in both cases.

The target of this study is to investigate aninnovative indoor LED illumination that usesheat pipes as the heat transfer channels toconduct the released heat of the LED to theheat-sink fins on the two sides. Naturalconvection inside the flow channels within theheat-sink fins or the forced convection made bythe returned flow of HAVC system serve as theoverall heat elimination mechanism.

The objective of this study is to identify theeffects of mirror duct system on energy savingsfor luminaries. The results of the experimentsshowed that more than half of the subjects judgedthe room was bright when the illuminance on thedesk from mirror duct system was higher than100 lx. Half of the subjects judged ceilinglurninaire could be turned off when theilluminance on the desk was higher than 100 Ix inthe case of relaxing. On the other hand, about80% of the subjects always switched on theluminaire regardless of the illuminance on thedesk in the case of reading.

The quality of a hydronic energy system isinfluenced by supply and return temperatures.Instead of using the exergy term, a TEA(Temperature and Energy Accumulated) curveis introduced for evaluating an examplifiedplanned 100 GWh district heating systemoutside Oslo.Main focus is on normal running conditionsoff the design point. The following questionswere raised when analyzing the energysystem:how could we make a design that improvesthe use of low temperature energy?is a design with low flow rate, i.e.

In this paper, a multi-zone modeling concept isproposed based on a simplified energy balanceformulation to provide a better prediction of theindoor horizontal temperature variation insidethe livestock building. The developedmathematical models reflect the influences fromthe weather, the livestock, the ventilation systemand the building on the dynamic performance ofindoor climate.

DX A/C systems are widely used insmall to medium size building and generallyrely on On-Off control as a low-cost approachto maintain only indoor dry-bulb temperature.Continuously running the supply fan in a DXA/C system has a significant influence on themoisture removal effectiveness of DX A/Csystem. During an On-Off period, the airpassing through the system's cooling coil maylead to the re-evaporation of the residualmoisture on coil's finned surface.

In order to further improve energyperformance of buildings, intelligentbuilding control is needed which integratesindividual demands and behavior ofoccupants. Intelligent Agent technology issuited to be implemented at different levelsof building automation. Individual agentscontrol the climate for each user of thebuilding in combination with feedback onthe energy consumption can lead to betterindividual comfort and a reduction of energyconsumption.

HVAC (Heating, ventilating air conditioning)system is used to keep indoor air quality. Thepurpose of the traditional HAVC system isproviding a comfortable environment andventilating the indoor air pollutants. Recently,with the quality of life increasing, people havemore requests for indoor air quality. However,we found that the HVAC system still stressindoor ventilation, and temperature andhumidity adjusting.

Thermal building simulations (TRNSYS) werelinked to nodal airflow network simulations(COMIS) for a detailed ventilated double-skinfacade calculation of performance. Thevalidated simulation model can be used tooptimize the ventilated facade design in respectto reducing the solar heat gains during thesummer period by controlling the exhaustairflow. This may result in significant energysavings and a reduction in systems cooling size.This work evaluates two different controlstrategies of ventilated faqade designs in respectto cooling load reductions.

Double-skin facade (DSF) is an architectural/ engineering solution developed from the need to increase comfort in buildings with full glazed facades. The actual concept of holistic approaches to the building energy system considers DSF as an element of an Advanced Integrated Facade. DSF were developed for colder climates and uncertainty remains on their applicability to warmer areas due to higher probability of overheating.