Issue 4/2005

The article describes the possibility of energy savings for building operations, (heating, ventilation, air conditioning, warm service water) for which the energy consumption in the Czech Republic represents approximately 50 % of the total – energy use The author outlines the importance of buildings with low energy consumption for sustainable development. He also critiques the current way of allocating supports and subsidies for energy savings at construction sites that he refers to as “ecological waste”.

The contribution describes the properties of autonomous and communicative controls of individual rooms, evaluates the technological trends of the last few years and their influence on the choice of control type. The author directs the readers’ attention to some risks of control system selection and offers rules as to how to avoid these risks. For communicative control he suggests bus types as they are used in most cases nowadays, and offers a comparison. He points out the potential of communicative control in the area of energy savings and improved comfort in a building. In conclusion he describes the integration of additional systems into the control scheme of individual rooms and evaluates their practical contribution from the point of view of the overall building control system.

The article is devoted to design methodology of light and dark gas radiators. The methodology is explained by means of an example of installation, and is substantiated by a theoretical simplified simulation generated by Fluent 6.1 software.

A unified set of boundary conditions for testing of Underfloor heaters currently does not exist. Based on his years of experience in the field of research engineering, the author outlines the suggested methods for testing Underfloor heaters .

The article brings the results of ELF EMF measurements (Extremely Low Frequency of Electromagnetic Fields) in the interior of a classic bricked residential building under a high-voltage distribution of 400 kV. Separately detected are the values of magnetic induction and electric field intensity. The levels detected in the building interior are under the reference level of government order No. 480/2000 Sb. [1].

Entrance the Czech Republic to the European Union on 1st May 2004 was the milestone for large harmonization of Czech standards with European standards. This research found unifications of limits and principles of artificial lighting in indoor work places in the Czech Republic and in the developed countries of European Union.

The article brings to light the problems of interconnected radiator systems. Authors mapped the temperature fields, of several types of panel radiators based on their locations within the heating system by termographic camera. Results allowed them to recommend the optimal connection pattern of the individual panel radiators.

It is possible to realize energy savings for pump and fan operations by the use of motor speed control. The most efficient motor speed control is achieved through frequency control

The article describes two types of transparent façade and roof raster systems reducing the interior heat load due to solar radiation. Both types use rolled sheet glass – an optical raster that acts as a separator of the direct and diffused component of impinging solar radiation. The raster exhibits its influence only on the direct component which constitutes a substantial share of solar energy, while the diffused light penetrates into the internal spaces without substantial changes.