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energy efficiency

Evaluation of potential possibility of energy efficiency in residential buildings

The programme ‘Energy Audit’ has been worked out at the Energy Efficiency Centre of the Institute of Physical Energetics, LAS, and may be used for evaluation of heat losses from buildings and the economic efficiency of measures to be taken for their therm

Energy efficient residential ventilation control

A concept is investigated for the energy efficient control of residential mechanical ventilation in response to outdoor air temperature and the corresponding stack-driven infiltration. The control concept takes advantage of the natural air leakage characteristics of a house and the ability of temperature-driven stack infiltration to provide ventilation air to the house. As the outdoor to indoor temperature difference increases and natural infiltration increases, the fan operation is reduced, thereby minimizing over-ventilation.

User "friendly" residential ventilation system control strategies and effectiveness

The most efficient ventilation system would only operate on demand, when ventilation was "needed". Running the ventilation system all the time at a low flow rate, a rate sufficient to match the ASHRAE recommended 0.35 ACH is a crude control approach to an optimum system. Conditions in a house are not constant. On average, a constant flow rate ventilation system will work reasonably well and certainly is simple, but there are more energy efficient approaches, and users tend to shut down systems that run constantly.

EU FP6-proposal "BRITA in PuBs" positively evaluated by the Commission

The objective of the BRITA in PuBS proposal on Ecobuildings is an increasing of the market penetration of innovative and effective retrofit solutions to improve energy efficiency and implement renewables, with moderate additional costs.

Building envelope, duct leakage and HVAC system performance in HUD-code manufactured homes

Between 200,000 to 300,000 manufactured homes are built to the US Department of Housing and Urban Development’s Manufactured Home Construction and Safety Standards (MHCSS) in the US each year. This paper compares building envelope, duct leakage and HVAC s

Total energy performance of the air conditioning system using outdoor air cooling potential

From the view point of designing the energy efficient air conditioning system with maximized ventilation, the possibility of an all fresh air system was discussed using the simulation results of a model building in Tokyo. The algorithm of single duct cooling system for simulating the cooling coil of air handling unit based on the heat balance model of whole system components is also described as a base for the simulation of cooling effect of ventilation fresh air.

Energy efficient thermal comfort vs air quality in air-conditioned healthcare applications.

The balance between the energy efficient thermal comfort and Indoor Air Quality (IAQ) in healthcare facilities is the main of this paper. The present paper will present this balance from the viewpoint of the air conditioning design. It was found that the design of the HVAC airside systems plays an important role for the energy consumption optimizations and achieving the optimum IAQ. This paper highlights the importance of the proper airside design on the energy consumption, thermal comfort and IAQ.

Optimization of airflow regimes, energy efficiency, and air quality in surgical operating theatres.

The present paper addresses and fosters the factors that affect airflow movement and energy efficiencies in the surgical operating theatres. The present work puts forward analyses for major factors contributing to failure to achieve and attain the optimum Indoor Air Quality (IAQ), and the methods suggested to solve such problem. Appropriate architectural and mechanical engineering recommendations to achieve the optimum hygienic operating theatre are set out in the paper.

Statistical interpretation of the results of building simulation and its use in design decisions

The practical use of building simulation software requires a global and comprehensible interpretation of results for decision support in design. We propose a method in which the temperature of the free-running building is used to express: 1) the ratio between energy consumption for heating and cooling, 2) energy saved when ventilation is used instead of mechanical cooling, and 3) the degree of building adaptation to the environment.

Two energy efficiency measures for constant air volume exhaust systems : using dampers and variable air frequency drives

The conventional constant air volume exhaust fan system is actually a variable air volume system. The fan airflow increases as the fume hood airflow decreases. Under partial fume hood exhaust airflow, the fan power is higher than the design fan power. Two energy efficiency measures are developed in this study to reduce the fan power of the conventional constant air volume exhaust system. In the first measure, a modulation damper is added in the main exhaust air duct and

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