Nowak, Bernard
Loading...
Email Address
Employee
nieaktywny
Alternative name
Discipline
Author Profiles
Systemy AGH
18 results
Filters
Advanced Search
Filter by
Settings
Search Results
Now showing 1 - 10 of 18
Item type:Patent, Access status: Open Access , Układ chłodzenia powietrza w ścianowych wyrobiskach górniczych opis patentowy nr 201255(Urząd Patentowy Rzeczypospolitej Polskiej, 2009-03-31) Nowak, Bernard; Roszkowski, Janusz; Łuska, Piotr; Filek, Krzysztof; Akademia Górniczo-Hutnicza im. Stanisława Staszica (Kraków)Item type:Patent, Access status: Open Access , Układ lokalnego chłodzenia powietrza w ścianowych wyrobiskach górniczych opis patentowy nr 202137(Urząd Patentowy Rzeczypospolitej Polskiej, 2009-06-30) Nowak, Bernard; Roszkowski, Janusz; Łuska, Piotr; Filek, Krzysztof; Akademia Górniczo-Hutnicza im. Stanisława Staszica (Kraków)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 , 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 , 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.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 , Wpływ profilu prędkości powietrza na parametry przepływu dwufazowego w szybie wentylacyjnym(Wydawnictwa AGH, 2010) Branny, Marian; Nowak, Bernard; Ptaszyński, Bogusław; Kuczera, Zbigniew; Łuczak, Rafał; Życzkowski, PiotrSeveral inflows of water beyond shaft brickwork occur frequently on the length of the upcast shaft. The article describes the results of influence of air velocity profile on the parameters of two-phase flow in the upcast shaft for accepting constant discharge of water flows to the cross-section of shaft with water drops diameter: 0,5 mm, 1 mm, 2 mm, 3 mm.Item type:Article, Access status: Open Access , Statystyczne wskaźniki oceny jakości pracy chłodziarki DV-290(Wydawnictwa AGH, 2010) Nowak, Bernard; Filek, Krzysztof; Kuczera, Zbigniew; Łuczak, Rafał; Ptaszyński, Bogusław; Życzkowski, PiotrIn this article, on the basis of statistical analysis, quality indicators of work of air refrigerator DV-290 with evaporative water cooler RK-450 were shown. The quality indicators were designated from the analysis of multiple regression. That calculations based on equations which describe the actual processes taking place in direct action refrigerators cooperating with evaporative water coolers by using multiple regression analysis. Received multiple regression functions, which describe the evaporator thermal power for the two variants with different number of independent variables, are right in the performance of air coolers. Comparison of the proposed statistical models can identify the most practical for using by the mining service. It will allow to choose the liquidation of any discrepancies, which decide about reducing the effectiveness of air cooling.Item type:Article, Access status: Open Access , Wartości współczynników wymiany ciepła i masy w wentylatorowej wyparnej chłodnicy wody(Wydawnictwa AGH, 2010) Nowak, Bernard; Filek, Krzysztof; Branny, MarianResults of experimental studies of the performance of fan evaporative type of water coolers are presented in this paper. Tests were conducted with two types of coolers - RK-450 and CWW-420. Parameters of cooled and spray water and of the air were measured. On the base of data collected during laboratory experiments, coefficients of heat and mass exchange were calculated for both tested coolers. Among this coefficient are: overall heat-transfer coefficient through membrane (k), convective heat-transfer coefficient (alpha) and coefficient of mass exchange (P) between spray water and the air. There were determined regression lines and coefficients of linear correlation for k and a in dependence of inlet water temperature. The results of experiments and calculations are presented in the form of plots and tables.Item type:Article, Access status: Open Access , Eksperymentalne badania pracy górniczych sprężarkowych chłodziarek powietrza współpracujących z wyparnymi chłodnicami wody(Wydawnictwa AGH, 2010) Nowak, Bernard; Filek, Krzysztof; Łuska, PiotrMeasurement results of the work parameters applied to two types of air refrigerators: DV-290 and TS-300B located in underground mines and used by two evaporative water coolers: RK-450 and CWW-420 are presented in this paper. Parameters of the mass or the capacity flows were measured as well as the inlets and the outlets' temperature of the diaphragmatic exchangers - evaporators, condensers and evaporated water coolers for all of the mediums occured in the system - air, water, atmospheric pressure and the refrigerating medium. The air moisture was measured using the dry and wet bulb thermometer. Thermal power of all of the exchangers was determined on the basis of the results of the experiments. All the data were presented in the form of charts and tables.