Nowak, Bernard
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Item type:Article, Access status: Open Access , Eksperymentalne określenie wpływu doboru czynnika chłodniczego na moc cieplną chłodziarki sprężarkowej(2006) Filek, Krzysztof; Nowak, BernardIn this article a problem of air-cooling efficiency by using mine compression refrigerator is presented. Experimentally, a thermal power of evaporator was defined, as figure of cooling merit. Measurements were carried out on test stand for refrigerator work with three different pro-ecological refrigerants - R404A, R407C and R507. For that purpose, it was achieved the measurements of temperature and humidity of air before and after cooling, and rate of air flow through evaporator. In amount, cooling of air in 108 different variants were studied - 36 for each mentioned refrigerant. Particular variants of studies were differed in input conditions - state of cooling air and rate of air flow. Making measurements for different refrigerants were kept up equal input conditions in suited variants. Temperature of air before evaporator was kept up on three levels, its relative humidity - on three levels, too, efficiency of flow - on four levels. Results of those studies in form of thermal power of evaporator, which was enumerated on the basis of measurements, are presented in table, whereas on charts are shown separately results for each flow efficiency. Obtained results of studies allowed to estimate a quality of air cooling by refrigerator in dependence on using refrigerant.Item type:Article, Access status: Open Access , Indirect mine air-cooling by cooler of water(2013) Nowak, Bernard; Filek, KrzysztofArtykuł dotyczy zagadnienia pośredniego chłodzenia powietrza kopalnianego chłodnicą przeponową zasilaną zimną wodą chłodzoną w parowniku chłodziarki sprężarkowej. Na podstawie bilansów entalpii powietrza, wody i czynnika chłodniczego, a także masy pary wodnej w powietrzu, wyprowadzono równania matematycznego opisu ustalonego w czasie działania tych wymienników, traktowanych jako elementy o charakterze skupionym, w których parametry wymienionych mediów podlegają zmianom skokowym. Opierając się na utworzonym modelu, dla chłodziarki z czynnikiem chłodniczym R507 wykonano przykładowe obliczenia zmian temperatury i wilgotności powietrza chłodzonego w chłodnicy wodnej oraz temperatury wody chłodzonej w parowniku. Wyliczono też moce cieplne chłodnicy powietrza - od strony powietrza (z podziałem na jawną moc ochładzania i utajoną moc osuszania) i od strony wody oraz parownika - od strony wody i od strony czynnika chłodniczego.Item type:Article, Access status: Open Access , Chłodzenie powietrza małogabarytowymi wodnymi chłodnicami ścianowymi(Wydawnictwa AGH, 2005) Filek, Krzysztof; Franczuk, Waldemar; Łuska, Piotr; Nowak, Bernard; Roszkowski, JanuszThe results of measurements of cooling water temperature and temperature and humidity of cooled air, which were taken in longwall no. 3 of seam no. 502 at part J in »Śląsk« Colliery during the operation of a unit consisting of 4 small-sized diaphragm water air coolers (these are the first units of this kind in Poland) are presented in this paper. Themeasurement results of heat power for each air-cooler, temperature and specific humidity of cooled air were compared to calculation results, which were obtained on the basis of the equations presented in the paper. The research was conducted for two variants of air-coolers’ connection to a water pipe – in series (variant A) and in series – parallel (variant B). The results of calculations and measurements are presented in the tables and the graphs. The conducted research allows to determine that total heat power of four air-coolers is within limits 120130 kW. The greater power of the system with a series-parallel coolers’ connection can be observed in the form of a slightly lower air temperature in the longwall, behind the outlet of the longwall air temperature was reduced by 2.2°C (variant A) and 2.8°C (variant B) in comparison with the situation without cooling.Item type:Article, Access status: Open Access , Wykorzystanie czynników chłodniczych R507 i R404A w górniczej chłodziarce powietrza(Wydawnictwa AGH, 2005) Filek, Krzysztof; Łuska, Piotr; Nowak, BernardIn this work is raised a problem of the air refrigeration with a help of the mining cold-air refrigerator wit a direct action, where is used two pre-ecological refrigerants - R404A and R 507. The compression refrigerator TS-300 was examined on the test stand at 90 variants its work (on 45 for each refrigerants). Those variants were differed in properties (a temperature, a humidity, a flow rate of air refrigeration). The results of the thermodynamic variable measurements after pre-cooling were compared with the results of numerical calculations, which were made by using the mathematical model. The effects of measurements and calculations, which were closed to the mining conditions, were shown in the chartsItem type:Article, Access status: Open Access , Zmiana parametrów termodynamicznych powietrza w parowniku chłodziarki górniczej z czynnikiem R407C(2006) Filek, Krzysztof; Łuska, Piotr; Nowak, BernardThe main topic in this publication is connected with work of mine compression refrigerator with the refrigerant R407C. The publication includes the results of the change of temperature and air humidity, which are proceed in the evaporator. 45 variants were tested. This variants were differed in properties (temperature, relative humidity and flow rate through the evaporator). In the work are shown the results of 24 variants, for which the properties of air inlet are the most close to reality (excavations in the underground mines). Moreover, this publication includes the results of numerical calculations of precooled air parameters and the thermal power of evaporator. In this case all results of air parameters before precooling are used as the input data. The findings are compiled in the tabular form and in the shape of diagram.