Submitted by Maria.Kapsalaki on Thu, 10/31/2013 - 11:46
It is foreseen that the 2012 version of the French regulation will include a minimum requirement for the envelope airtightness of residential buildings, with two options to justify its treatment: a) measurement at commissioning or b) adoption of an approved quality management approach. This paper describes the qualification process for authorizing technicians to conduct airtightness measurement when the result is to be used in the EP-calculation method. It also discusses the requirements set for approved quality management approaches.
Submitted by Maria.Kapsalaki on Mon, 10/28/2013 - 12:03
The approval of the Technical Building Code has meant major changes in the construction of multi-storey buildings in Spain. One of the most important revisions, with respect to the buildings erected prior to the Technical Building Code, has been the obligation to ventilate each one of its rooms. Depending on the use and occupancy a minimum flow rate of ventilation is required in each room.
Explicit algebraic equations for calculation of wind and stack driven ventilation were developed by parametrically matching exact solutions to the flow equations for building envelopes. These separate wind and stack effect flow calculation procedures were incorporated in a simple natural ventilation model, AIM-2, with empirical functions for superposition of wind and stack effect and for estimating wind shelter.
Submitted by Maria.Kapsalaki on Fri, 10/25/2013 - 19:42
Tracer gas techniques have been the most appropriate experimental method of determining airflows and ventilation rates in houses. However, current trends to reduce greenhouse gas effects have prompted the need for alternative techniques, such as passive sampling. In this research passive sampling techniques have been used to demonstrate the potential to fulfil these requirements by using solutions of volatile organic compounds (VOCs) and solid phase microextraction (SPME) fibres.
The Energy Performance of Buildings Directivementions that each member states' energyperformance (EP) calculation methodology mayinclude envelope airtightness. In fact, manymember states have included envelopeairtightness in their EP calculation method.Many countries have also specific requirementsfor ductwork airtightness. However, they seemto be unequally successful in achieving a markettransformation. This paper describes themechanisms that have been used in somecountries, with a special focus on success storieswhich could inspire other member states.
This research was to assess the performance of air infiltration, the corresponding energy consumption, indoor contaminant level for residential buildings in Harbin, a typical city in the severe cold region of China. Based on questionnaire survey and field measurements, the prototypical apartment building includes its physical structure, air leakage and life style of occupants has been determined. Then unsteady-state numerical simulations were carried out by the use of COMIS.
Single- and double-section manufactured homes were instrumented in 2001-2003 to measure continuous energy usage and air infiltration with respect to the environmental conditions of a windy cold dry climate. The test site near Arlington, Wyoming, USA is ideal for testing the energy (and structural) performance of manufactured housing due to the naturally occurring high winds (in excess of 35 m/s annually) and temperature extremes (+35 to -35C). Tests included tracer gas monitoring, pressurized leakage tests, and infrared (IR) video scans.
In conventional construction, the ventilation air enters a building through a combination of ‘desired’ pathways, via opened apertures, such as a window, vents, and ‘undesired’ pathways, via cracks such as around external openings, joints between building
A method was developed to estimate annual air infiltration rates in houses from measured data (building envelope air tightness, wind speeds, indoor and outdoor air temperatures). It was applied to 6 houses and the results showed a close correlation with the results from existing air filtration models.
Air infiltration through the exterior envelope of a residential building impacts significantly on the heating energy consumption and cost, especially in a cold climate such as Montreal's. Therefore to renovate existing houses to the level of new well-built houses in terms of airtightness will lead to a reduction of the heating energy costs. By considering the life-cycle energy consumption and the initial cost of renovation, and the CO2 tax credits, the paper estimates the cost-effectiveness of this type of renovation.