This article provides information on the characteristic heat-related data of the enclosing constructions of the existing multi-apartment houses in Latvia as well as those of the sanitation systems in these houses.Monitoring of the heat energy consumption has been conducted in order to determine energy consumption over one-year period in a renovated nine-storey multi-apartment house of the 602 series design. The results obtained through monitoring have been compared with those of the heat energy consumption in an analogous reference house.

The new perspective technology in building heat supply and climatisation, are given in this paper. The main energy-saving solutions are following: architectural and layout design taking into account the influence of solar radiation and wind direction; high thermal insulation of building envelope and glazing; mechanical supply-and-exhaust ventilation systems for each flat; Ground heat and exhaust air heat recovery for hot water supply; doublepipe heating system for each flat, horizontal, equipped with flat heat meters and thermostatic valves installed at each room heater.

Historically, industrial buildings have been simple constructions with no insulation. Ventilation has been natural through openings in the walls and in the roof. Around 1970 we started investigating airflows in large industrial premises by water model studies. This lead to a better understanding of the ventilation airflow patterns in heavy industries. In the following years, the principles were applied in practice. At the present, more than 30 large plants have been designed according to these principles and valuable experience has been gained.

The annual energy cost and first cost of the HVAC system, life-cycle costs (LCC) and benefits of improved productivity were simulated in an office building located in a cold climate when improvements of air quality were made by increasing the outdoor air supply rate and by reducing the pollution loads. The building was ventilated by a variable air volume (VAV) system with an economizer or a constant air volume (CAV) system with heat recovery. The pollution loads were assumed to be similar to those in a non-low-polluting or low-polluting building.

This paper describes a study of reduced performance of mechanical exhaust systems in 42 Dutch houses after several years of operation. It also describes the effect of reduced ventilation on air quality and the perception and use of the ventilation system by residents. The guanine contents of dust samples taken from the sleeping room were determined to assess the risk of allergy.

Background. A low ventilation rate has been shown to increase the risk for health and comfort problems in offices. However, very few studies have investigated the impact of ventilation rate at home on health effects, (Wargocki et al. 2002). The aim of this study was to investigate if low ventilation rates in homes do increase the risk for asthma and other allergic symptoms among pre-school children in Sweden.

A SUSTAINABLE BUILDING DESIGNED FOR A COLD CLIMATE WITH EXTENSIVE USE OF INFORMATION TECHNOLOGY In the past, Telenor’s operations in Bergen have been spread across many sites and buildings. This was regarded as ineffective and uneconomic, and in 1995, the

An evaluation of different ventilation principles and their application in various premises like bars and restaurants has been conducted. Measurements of nicotine concentrations revealed a strong dependency on ventilation solutions. In restaurants and bars where the ventilation systems are properly designed it is possible to fulfill requirements issued by the Norwegian authorities.

Thirty subjects (17 female) were exposed for 5 hours in a climate chamber to clean air at 5%, 15%, 25% and 35% RH at 22 °C, in balanced order. Another 30 subjects (15 female) were similarly exposed to air polluted by carpet and linoleum at 18, 22 and 26 °

A number of computer simulation case studies have been conducted with the objective of investigating the potential for energy savings in buildings with variable air volume (VAV) systems and demand controlled ventilation (DCV), compared to buildings with conventional constant air volume (CAV) ventilation systems. The simulation systems have been modelled on a modular form, they are generally very detailed and comprehensive, and they have shown to be able to provide very realistic results compared to real world conditions.