Field tests and a model allowed to study contaminant concentrations in a single family home in California operating with natural ventilation or with one of six mechanical ventilation systems (cyclic or continuous, multi-point or single-point exhaust). Continuous ventilation appears to be better for contaminant levels control.

This study is an analysis of the advantages of two ventilation systems (exhaust mechanical ventilation, balanced mechanical ventilation with heat recovery) using the Negative Index approach, which is affected by life cycle cost and environmental impact. The balanced system appears to be a better choice (less environmental impact, better indoor air quality) even if its life cycle cost is higher.

Thermal mixing of two air streams (outdoor air flow and return air flow) with different temperatures and velocities was studied experimentally in a chamber as it exists inside air handling units, with different adjustments of parallel air dampers. Results show how and where the mixing occurs in the chamber. Indications about the influence of the air dampers adjustment on mixing effectiveness are given.

This paper gives formulas for optimal design of all-air systems regarding costs, allowing to calculate the optimum outdoor air rates in office buildings.

The study was to evaluate energy use of ventilation system with supply in corridors and exhaust in wet rooms. The field test protocol was to measure energy use one day with corridor supply ventilation on, one day off, for a range of different outdoor temperatures in winter. When corridor supply is on, the internal pressure changes (although always negative) and infiltrations are modified.

The aim of this study is to evaluate different control strategies on ventilation in a bathroom and their efficiency. Comments are given on running time periods as well as reaction of different controls (occupation, CO2/COV, humidity).

Three algorithms (steady-state, dynamic, proportional) for CO2-demand controlled ventilation, coupled with three methods for determining minimum air flow rates (Ashrae 62, CEN CR 1752, Polish standard) and three occupancy scenarios, have been analysed in a research project to promote such systems in Poland. Results show that not only algorithms, but also minimum flow rate requirements, influence the operation of the system.

The revision of Ashrae standard 62, Ventilation for Acceptable Indoor Air Quality, began in 1991. This article gives a summary of the changes that have been approved and describes the issues that remain to be resolved.

Describes the content of the European and International standard EN-ISO 13792 which allows the simplified calculation of the internal temperature in hot season of a room without mechanical cooling.

The article presents the scope and content of ISO 13790 standard which is intended to calculate the energy use for space heating of buildings. Information is given about the accuracy of the standard calculation method.