English

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.

There are many technologies aimed at reducing energy demand of ventilation systems, but thefocus in these designs has remained on the airheating system and exhaust losses. In fact, atypical daily exhaust air requirement for oneperson has the same quantity of exergy as thewater fi-om a typical shower, and thus heatingsystems must also consider hot water.This project presents the exergy analysis ofintegrating wastewater heat recovery into abuilding heating system. A heat pump providesroom conditioning and hot water heating.

The primary purpose of the present study was toevaluate the effects of retrofitting of windowsashes by measuring air tightness performanceand thermal environment of apartment housesbuilt during the period 1965 - 1974 before andafter the retrofitting of window sashes. Also,ventilation rate in each zone and air tightness onroom fittings were determined in multi-zonetype dwelling units, and evaluation was madeon ventilating sinlulation between multi-zonedwelling units.

A semi-empirical ventilation model was proposed for cross-ventilation. This model isbased on local dynamic similarity theory andwas coupled with COMIS and TRNSYS, whichare widely used for energy conservationsimulation. A simulation study was performedon a typical detached house in Japan to evaluatethe energy conservation effect of crossventilationduring the day. The conventionalOrifice model overestimated the ventilation flow rates compared to those by COMIS-LDSM, especially when the approaching flow was not normal to the upwind openings.

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.

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.

Natural ventilation systems in multi-familyresidential buildings should meet the needs ofreducing ventilation heat loss as well asproviding good indoor air quality. Therefore, itis important to estimate the adequate area ofnatural ventilation systems based on reasonableperformance data.

Tokyo Electric Power Company R&D Center wascompleted in September 1994. The buildingsconstructed in Phase I (hereinafter just called "thebuildings") were conferred the 35th Annual Awardsby the Society of Heating, Air-Conditioning, andSanitary Engineers of Japan (SHASE). The awardwas given to commend the 30% (approx.) energysavings attained by the adoption of the cold airdistribution system and various other techniques andtechnologies for energy conservation and operationmanagement.

It is known that there are some methods ofenergy conservation for building facilities.Energy recovery ventilator (ERV),which canrecover sensible heat and latent heat, is one ofthe solution to reduce heatinglcooling loads,which are related to the power consumption ofair conditioning systems. Manufacturesspecify the performance of ERV'seffectiveness on the specification, however,there are few measured examples on energyeffectiveness in actual conditions in mildclimate area.

Numerous studies and everyday experiencesprove the fact that even new buildings do notperform as expected. Dissatisfaction with theindoor air quality and thermal comfort iscommon and the energy performance is not onthe targeted level regardless of the newtechnologies utilized and advanced systemsinstalled. To avoid these Izinds of situationsquality assurance procedures known as BuildingCommissioning have been developed in manycountries and taken into the use especially inUSA.