AIVC - Air Infiltration and Ventilation Centre

Search form


You are here



Thermal comfort in naturally ventilated buildings: revisions to Ashrae Standard 55

A new Adaptive Comfort Standard is included in the recently accepted revisions to Ashrae standard 55. That ACS permits warmer indoor temperatures for naturally ventilated buildings during summer and in warmer climate zones. It is based on the analysis of 21,000 sets of raw data compiled from field studies in 160 buildings located in different climatic zones on the 4 continents.

Standard 62 and smoking

This article presents how ventilation and air quality in smoking spaces are being treated by ANSI/ASHRAE standard 62, Ventilation for Acceptable Indoor Air Quality. Historical information is given about environmental tobacco smoke and ventilation requirements in the standard since its first issue in 1973. The status of the 31 addenda to the 1999 version of the standard, some of them being included in the 2001 version, others still being in discussion or in the process to be adopted, is explained. Among them are four smoking-related addenda : 62e, 62g, 62o and 62ag.

Displacement ventilation environments with chilled ceilings: thermal comfort design within the context of the BS EN ISO7730 versus adaptive debate

The current design standard BS EN ISO 7730 is based upon the work of Fanger dated 1995, dealing with a steady-state human heat balance model that leads to a prediction of the sensation of human thermal comfort for a given set of thermal conditions. That model was then developed for "conventional" environments. But is the current standard still applicable to more sophisticated environments such as offices with chilled ceiling, in combination with displacement ventilation ? This paper presents findings from a study that sought to answer that question.

Current approaches for mechanical ventilation of houses

Current approach for design and installation of mechanical ventilation systems in houses is described in the framework of Canadian building codes and standards, which contain requirements about air change rates, air distribution, sound level, interference with other systems or building envelope.

Clean rooms in hospitals: design approach and the new french standard S 90-351

Comments about the project of the new french standard NF S 90-351 "Clean rooms and related controlled environments in medical establishments" and the consequences on the design approach of clean rooms to master airborne contamination are given.

The french standard NF S 90-351 "Clean rooms and related controlled environments in medical establishments"

The french standard NF S 90-351 has been modified to include a wider field of application. This standard now takes into account previsional aspects. It is needed to define "areas at risk", and materials and equipment performances.

ISO TC 205: an attempt of international standardization on indoor air quality criteria

The working group WG4 of ISO TC 205 aims to define Indoor Air Quality criteria. The draftstandard contains several methods for determining ventilation rates, based on these criteria.The ventilation rates obtained with some of these methods are compared for several premises:ASHRAE 62-1999, the method of perceived IAQ of CR 1752, and the prescriptive method ofAS 1668.2. To improve the comparison, ventilation rates are also calculated with the prEN13779 method.The studied buildings contains offices, classrooms and a play area.

Energy performance standardisation and regulation in Europe

Energy Performance (EP) standardisation and regulation is by a growing number of countriesconsidered as an attractive approach for achieving a more energy efficient built environment.Several countries have already enacted such EP based regulation (the Netherlands, France,Germany, ASHRAE approach in North America), or are preparing one (Greece, theFlemish Region).The European Council and Parliament are drafting a directive on the Energy Performance ofbuildings, imposing the institution of such regulation in every member state.This paper will give a general introduction to the issue of energy

Ashrae's residential ventilation standard : exegesis of proposed standard 62.2.

In June 2001 ASHRAE's Standard Project Committee on "Ventilation and Acceptable Indoor Air Quality in Low-Rise Residential Buildings", SPC 62.2P, recommended and the Board of Directors approved ASHRAE's second complete standard on residential ventilation for public review; this was followed by public reviews of independent substantive changes in 2002 . The standard is an attempt by the Society to address concerns over indoor air quality in dwellings and to set minimum requirements that would allow for indoor air quality and energy efficiency measures to be evaluated.

Innovative ventilation systems

The aim of this workshop organised by BBRI was to identify recent developments in ventilation systems/strategies and to analyse how such innovative systems are at present treated in regulations and how they could be better treated in the future.