Issue 1/1997

The issue of lighting in buildings is presented as a complex task which is frequently omitted. Good lighting and visual comfort contribute significantly to the overall quality of internal environment in buildings. From this point of view the basic principles for the architectural design and for applications of building technology are mentioned

Different versions of single-pipe heating systems, their merits and drawbacks are discussed in this paper. Two examples of single-pipe horizontal heating system design are mentioned: one with four-way fittings and another with the bypass.

Internal environment of the "HARD Jeseník'" industrial ha/l is analysed using two different computer programmes. The study is focused on the dynamic behaviour of the system comprising air-handling device and the ha/l structure inclu­ding their interaction. The analysis is based on the ESP-r simulating tool for system performance research. The results are compared with the MS Excel application which is rather simple and suitable for designers.

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Mixing ejectors with changeable cross section area of the nozzle substitute three elements in heating systems: ener­gy-recovery heat exchanger, three-way mixing valve and circulating pump. Such an exacting combination means that these ejectors are not of general purpose. This first (theoretical) part of the paper deals with the design of the ejector and boundary conditions analysis. The second part will concem the working characteristics of these devices including results of long-term experience in their operation.

An ejector as a fitting in heating system has considerable advantages because it can replace circulating pump, mixing valve and heat exchanger. However, it cannot be always used as a substitution of these three devices. A range of ejectors produced by BAELZ (Germany) is presented including the design methodology recommended by the manufacturer.

The paper presents characteristics of small power and heating plants uti/ising co-generating sets with gas engines. Particularly the energy efficiency and economical features of these power sources are demonstrated on examples of some foreign applications.

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Long-term experience in the design and operation of air-handling equipment is summarised in the paper. The basic hygienic requirements are mentioned as well as the most frequent errors in air technology projects and in their imple­mentations. The outdoor air requirements for ventilated spaces are discussed.

New fans for longitudinal ventilation of automobile tunnels are presented.

It has been proved for many times that the cheapest way how to deliver heat or different working media is by means of continuous pipelines. The paper informs about results of German study focused on heat delivery by rail. Obvious/y, this way of heat delivery is applicable in exceptional or emergency cases due to high costs. It is certainly contingent on ready-for-use railway.