Substantial effort has recently been devoted to passive solar desiccant air dehumidification. This research aims to describe the passive room dehumidifying system with the combination of an existing wooden attic space as a chamber and desiccant; an optimization of ventilation system and solar energy as system operation. The field measurement was carried out in the test house in Japan over hot humid summers in 2003 and 2004. It was found that the dehumidification rate of the wooden attic space was approximately 25 g/h per square meter of floor area of attic space.
The window is one of the most important elements in architecture. It has a complex character and fulfills multiple functions but it is a privileged device to connect the interior with the exterior. Architecture is frequently defined as an artificially delimitate space. These limits can be relative or absolute, depending on the environmental conditions. Some of these conditions are vital to human beings and require controlled elements. The window fulfills this role.
Due to the rapid growth of the country, prototype school buildings in Saudi Arabia were designed with little effort made towards the utilization of the natural resources to improve indoor conditions. Most of the existing school buildings in Riyadh, the capital city of the kingdom of Saudi Arabia, rely on mechanical equipment to cool interior spaces. As a result, these schools have become one of the major energy consumers during the peak time of the day.
A simplified method was investigated for estimating the dynamic pressure tangential to an opening (Pt) with Irwin’s surface wind sensor. The wind velocity measured by this sensor was broadly consistent with the value measured by a hot-wire anemometer. Mor
In order to optimise new buildings designers need calculation methods which help them to assess the effect of design choice on energy consumption and expenses. AICVF the French association of heating, ventilation and air conditioning engineers proposes guidelines presenting different types of methods to assess energy consumption for all energy uses. In particular, one of these methods developed by CSTB and AICVF takes account of intermittent space heating and enables the calculation of monthly energy requirements and expenses.
International building legislation is setting stronger and stronger requirements for the energy performance of buildings. An actual example is the impact of the Energy Performance of Buildings Directive in the European Union (EPBD) on the national requirements in the Member States. The improved energy performance of buildings cant be achieved by additional insulation or more effective buildings systems only. A major influence factor on the energy quality is the ventilation technology and also the airtightness of the building envelope.
There is worldwide plea to reduce carbon emission. Several governments in East Asia recently have responded by setting higher indoor temperatures in summer. But the public need to be convinced that such practice would not sacrifice indoor environmental quality, especially thermal comfort of the occupants. To implement such a measure, suitable ventilation system(s) to work under theunconventional conditions should be identified. Stratum ventilation, a new mode, is proposed for the elevated indoor temperature.
The legal background for the assessment of the energy performance of buildings and energycertificates in Germany will be changed in October 2009. Beside the tightening of the requirements byabout 30%, a significant change will be made at the calculation of residential buildings. Up to now thecalculation has to be performed by using the so-called simple approach (EN 15603) by applying theoutdated European standard EN 832 in combination with the European Standard EN 14335 withnational boundary conditions.
In order to respond to global warming and natural resources depletion challenges, industrials from the building sector need to propose an adequate offer. Energy simulation tools can support this process. Various studies and real cases show that a high performance level, e.g. primary energy consumption below 50 kWh.m-2 per year (including heating, cooling, domestic hot water, lighting and ventilation), can be reached by appropriate architecture combined with high insulation, free cooling and heat recovery on exhaust air.
The Center for Building Performances and Diagnostics of Carnegie Mellon University is experimenting with Hybrid Ventilation in Pittsburgh, Pennsylvania, USA, to evaluate the potential energy savings of this technique in a region where there are many variations in climate throughout any given year. Sharing the results of this experiment aims to increase awareness of this technique in the US and develop its implementation in the future.
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