Issue 2/1996

A number of special air-conditioning units were developed in Germany to be used in telephone terminal rooms reconstructed from relay to digital. The units have significantly economical, energy saving operation. They can be used in other applications with heat load exceeding 100 W/m2.

Dynamic development of fuzzy logic applications in control systems involves also the areas of environmental engineering: heating, air-conditioning, drying. The principles of fuzzy logic control are described with approach which is comprehensible to secon­dary-educated technicians. Described principles of fuzzy logic are applied in exam­ples - simultaneous control of a cooler by temperature and humidity regulators and control of a gas-fired boiler.

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The work extends the knowledge of the influence of forced supply airstream on the f10w field near exhaust inlets. The results are applicable to design of suction heads for laeal exhaust of harmful substances.

The paper informs us about an electrofiltering device which is designed for heavy operation in industry. The filter is able to remove oil or wax mist, fume, greasy vapours, fine dust, water and oil emulsions from air with high efficiency.

The most frequent mistakes and defects caused by building firrns in implementation of additional insulation of buildings are discussed including the consequences. Attention is given mainly to facade contact systems which are generally used in the Czech Republic.

The first part of the series was published in VVI 3/95 (Energy saving in buildings ­Step by step method, part No. I). It generally described the process of energy saving (ENCON process) starting with the identification and operation of given device. This part deals in detail with the first step of ENCON process. It explains how to find the most profitable projects and how to determine their ENCON potential quicldy but with reasonable accuracy.

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The paper deals with utilisation of wind energy in wind otors and electric generators. A survey of wind power stations operating in the Czech Republic is presented. Their total output have reached 7.3 MW.

Direct cooling which is often used in current systems has an advantage of lower energy demand in comparison with indirect cooling. However, a large volume of refrigerant and its complicated distribution (which is susceptíble to leakage) in direct cooling sys­tems contribute to apprehensíon of ecological problems. The goal of presented analysis is to reach a compromise between energy and environmental requirements.

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A brief information is given about the status of knowledge of air ionisation. Everywhere outdoor air always contents a certain volume of ionised gas. Therefore, air ionisation is a biogenic factor which man has been adapted to for a Iony time. The direct effect on man is stili being discussed and has not been cleared up yet. Some authors completely reject it, some of them exaggerate it. Artificial ionisation of indoor air is mainly applied for air cleaning.

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