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energy efficiency


Energy tariff is a major cost in hotel operation. Effective use of energy can reduce operationalexpenditures and has important environmental benefits. Solar heat gain particularly throughfenestration, contributes to a significant proportion of the building envelope cooling load. More solarradiation means more total solar heat gain and hence, more cooling requirements and larger electricityconsumption for air-conditioning in hot summer. Daylight makes an interior space look more lively andattractive and people expect good natural lighting in their living spaces.


Much of the analysis of the potential to save energy and reduce emissions of greenhouse gases in thebuildings sector has focused on the energy savings that can be achieved through incrementalimprovements in the efficiency of individual energy-using devices (motors, fans, pumps, boilers,chillers) but without changing the way in which they are put together as systems. However, muchlarger savings are possible through changes in building systems, and further, these savings can beachieved at much smaller incremental investment cost and sometimes at lower first cost.


When a building is used only for intermittent occupancy, continuous operation of ventilation system isnot necessary for achieving good indoor air quality during the occupation periods. Such buildings havea great energy saving potential which is not harnessed enough yet. Indeed, energy loss can be avoidedby promoting natural means and managing mechanical ones.


As presented by the Energy Green Paper “A European Strategy for a sustainable, competitive and Secure Energy” (1), Europe has entered a new energy era. Global demand is increasing within a framework of high and unstable prices. Emissions of greenhouse gas

CO2 emission and energy saving potential through correct pipe insulation in cold applications

In November 2006 a “CO2 emission and energy saving potential through correct pipe insulation of space heating and domestic hot water distribution systems in the new and existing buildings.” paper [3], sponsored by Armacell - worldwide producer of flexible

Building Blueprint: Endorsement Schemes for Building Energy Efficiency Improvements in the EU25

Although there is significant support among policy makers and politicians for energy efficiencyimprovements in buildings, there remains a lack of understanding of what policies (regulatory,economic, communicative and organisational) can deliver these changes on the ground. The blueprintstudy attempts to address this gap.

SIMUBEMS: An educational tool on control techniques

This paper describes an educational tool developed at LASH ENTPE (France) laboratory. Theobjective of this tool, called SIMUBEMS, is to familiarize ENTPE students with control techniques andallows performing simulations in order to test heating and ventilation control strategies.An office building equipped with an HVAC system has been used to carry out the simulations. Themodelled zone is 9 m long, 6 m large and 2.5 m height and has large glazed faade.

Increased Energy Efficiency and Improved Comfort

This paper summarises the work of the LowEx co-operation /1/. The aim was to promote rational use ofenergy by encouraging the use of low temperature heating systems and high temperature cooling systems ofbuildings. These systems can use a variety of fuels and renewable energy sources. Energy is used efficientlywhile providing a comfortable indoor climate. Exergy defines the quality of energy and is a concept fordesigning and assessing different heating and cooling systems. Application of exergy analysis into buildingshas not been common before.

Exergy Use in the Built Environment Basics and Analyses

It is often claimed that energy is consumed; this is not only done in everyday conversation but also inscientific discussions associated with energy and environmental issues. This claim conflicts with thefirst law of thermodynamics stating that the total amount of energy is conserved, even though forms ofenergy may change from one to another.

Best Practice Guidelines for Double Skin Facades

Many modern office buildings have highly glazed facades. Their energy efficiency and indoor climateis, however, being questioned. Therefore more and more of these buildings are being built with doubleskin facades, which can provide: a thermal buffer zone, energy savings, wind protection with openwindows, fire protection, aesthetics, solar preheating of ventilation air, sound protection, pollutantprotection with open windows, nocturnal cooling and a site for incorporation of PV cells.