English

To investigate the possibility of indoor air quality (IAQ) control by hybrid energy saving ventilation with an air cleaner using the sorption effect of building materials, this paper describes the identification to estimate the parameters related to the sink effect of materials, the concept of the novel air cleaner, and the performance evaluation of IAQ control for a house installed with the hybrid ventilation system to remove chemical contaminants by computer simulation.

This paper points out that the operation and management of the system for indoor air quality (IAQ) is more important than the design of air conditioning system. It is a widespread practice that for the sake of saving energy and operating expense, many building owners change the system's installations and operating manners of fresh air system of air conditioning. Almost all the building owners neglect the maintenance and management of air conditioning system. Those behaviours lead to seriously poor IAQ.

A new method of transport process visualisation is suggested to analyse the fluid flow and heat transfer structures. A two-dimensional displacement ventilation flow model is comprehensively investigated. Results demonstrated that the streamline and heatline visualising means macroscopically exhibit the nature of momentum and heat transfer philosophy, providing a direct insight to see the IAQ.

Today there is an increasing focus on the importance of a proper ventilation system to obtain good working conditions in the term of air and thermal quality to ensure high productivity. Different ventilation principles are used, e.g., mixing ventilation and displacement ventilation. In order to ensure that the ventilation system meets the demands it is important to know which parameters that influence the performance of the system. In this work the mixing ventilation principle was investigated.

Radon is a kind of radioactive inert gas. It exists in the soil pore, the underground water and the air. Radon and radon daughters can damage the human body. After they are inhaled into the lungs, radon daughters decay, emit alpha particles, lead to internal irradiation and even cause lung cancer. Radon can accumulate indoors; the problems of indoor radon concentration have aroused a great deal of attention. In this paper, the characteristics, sources, and health effects of radon are discussed in detail.

Indoor air quality (IAQ) in buildings can significantly affect people's health, comfort, satisfaction and productivity. Using VOC as an example, this paper outlines the methods and applications of three IAQ control strategies: source control, ventilation and air purification. It is recommended that all three IAQ control strategies be considered in order to achieve acceptable IAQ in buildings in a cost effective and energy efficient manner.

Due to the fact that more and more people are spending a considerable amount of time in an indoor environment it is important to minimise (or control) the amount of pollution that a person is exposed to. Sources of indoor air pollution are building materials, furniture, equipment and people. This work concentrates on personal exposure in a mixing ventilated room. The aim of this work is to investigate the exposure of a person due to pollution from another person in a mixing ventilated room.

Since no literature on design calculations for natural ventilation could be found, the author developed an original design method in the early nineties. He is still using the method to design areas that have to be ventilated naturally. An example of a very common application, is designing the ventilation of a transformer room and the outside air grid area necessary. A surprising result of the design of a practical situation is that it can be demonstrated on the basis of the calculations that wind speed has relatively little effect on the natural ventilation.

Describes how substantial differences resulted from performing a 'Duct Blaster' test during the framing stage and at completion. Outlines the tests used to pinpoint the problem. The tests included: frame-stage leakage - unit untaped; frame-stage leakage - unit taped; finish-stage leakage - face taped; finish-stage leakage - complete-taped; subtraction method; leakage to outside. The data obtained allowed the quantification of leakage at air handler units, at metal supply boots to outside and at supply registers to inside.

Describes how incentives for energy efficient rehabilitation of urban multifamily buildings has now been extended to single family homes, by one of the largest utilities in the US Midwest. The utility provides grants for nonprofit housing developers to include energy efficiency measures as part of their rehabilitation work on existing multifamily buildings. The new programme provides incentives for the construction of energy efficient new single family homes. The program targets abandoned, structurally sound masonry buildings and redevelops them as high-quality affordable housing.