Browsing by Author "Filek, Krzysztof"

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Access status: Open Access ,
Chłodzenie powietrza małogabarytowymi wodnymi chłodnicami ścianowymi
(Wydawnictwa AGH, 2005) Filek, Krzysztof; Franczuk, Waldemar; Łuska, Piotr; Nowak, Bernard; Roszkowski, Janusz
The 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.
Access status: Open Access ,
Chłodzenie powietrza w wyrobiskach chłodziarką sprężarkową o działaniu bezpośrednim
(Wydawnictwa AGH, 2011) Branny, Marian; Filek, Krzysztof; Swolkień, Justyna
Problem of air-cooling in blind headings with duct, exhausting systems of ventilation is considered. Performance of two types of compression refrigerators were tested. Calculations were made for different volume flows of air through evaporator and for different air temperatures in heading. Parameters of cooled air and cooling power of evaporators were calculated using mathematical model of compression refrigerator developed in [1]. The results of calculations are presented in the form of plots and tables. Cooling power of evaporators and its division on sensible and latent part was shown on diagrams.
Access status: Open Access ,
Dwufazowy przepływ powietrza i wody w pionowych wyrobiskach górniczych
(2008) Branny, Marian; Filek, Krzysztof; Nowak, Bernard; Ptaszyński, Bogusław
The article describes examples of two-phase flows in mining excavations and its impact on ventilation systems. Author discusses some of flows features, parameters and its theoretical models. The article presents computational model of two-phase flows in vertical expiratory shaft, using Euler-Lagrange's method. Numerical simulations were performed with the discrete phase model implemented using computational fluid dynamics (CFD) software- Fluent. Calculations results presented in the form of graphs are enclosed.
Access status: Open Access ,
Eksperymentalne badania pracy górniczych sprężarkowych chłodziarek powietrza współpracujących z wyparnymi chłodnicami wody
(Wydawnictwa AGH, 2010) Nowak, Bernard; Filek, Krzysztof; Łuska, Piotr
Measurement 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.
Access status: Open Access ,
Eksperymentalne określenie wpływu doboru czynnika chłodniczego na moc cieplną chłodziarki sprężarkowej
(2006) Filek, Krzysztof; Nowak, Bernard
In 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.
Access status: Open Access ,
Indirect mine air-cooling by cooler of water
(2013) Nowak, Bernard; Filek, Krzysztof
Artykuł 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.
Access status: Restricted ,
Koszty zużywanej energii w obiekcie mieszkalnym i metody ich obniżenia
(Data obrony: 2011-06-21) Łysak, Przemysław
Wydział Górnictwa i Geoinżynierii
Access status: Open Access ,
Kształt pola prędkości w wyrobiskach przewietrzanych wentylatorami wolnostrumieniowymi - symulacja numeryczna przy użyciu lepkościowych modeli turbulencji
(Wydawnictwa AGH, 2010) Branny, Marian; Filek, Krzysztof; Nowak, Bernard
Room and pillar headings are frequently ventilated with the use of jet fans. The range of penetration of an air stream generated by the jet fan is determined by several parameters; the major determinants being the initial stream parameters and the place of fan's installation. The paper presents a method of calculation 3D velocity fields in room and pillar headings. Results obtained with the use of three turbulence models, it is two equations model k-l i k-u SST and one equation of Spalart-Allmaras. Calculation were compared with measurements [Meyer 1993].
Access status: Open Access ,
Moc cieplna wymienników górniczej sprężarkowej chłodziarki powietrza
(Wydawnictwa AGH, 2009) Nowak, Bernard; Filek, Krzysztof
This article applies to mine compression refrigerator of air. In this article, work of refrigerator with or without inner regenerative heat exchanger (subcooler) is considered. The equations are given, from which thermal powers of evaporator, condenser and subcooler of refrigerator are determined. Focused character of all elements of refrigerator is assumed (expect specified, compressor and expansion valve also). For refrigerator with subcooler, system compound with 12 algebraic equations is received, in which unknowns are: temperature and humidity of cooled air, temperature of water after the condenser and temperature of refrigerant in five characteristic points of its circulation and ariolity degree of refrigerant of evaporator's inlet. For refrigerator without subcooler, the system is composed of 9 equations with the same as before unknowns, with the exception of 3 equations refer to subcooler.
Access status: Open Access ,
Próba opisu zjawiska prądów wstecznych metodami CFD
(2006) Branny, Marian; Broda, Krzysztof; Filek, Krzysztof; Mikołajczyk, Władysław
An attempt to describe the reverse flow phenomena through numerical simulation was undertaken in this paper. The flow domain creates a 150 m long declined gallery with 15 degrees angle of inclination. The airflow is descending in isotropic conditions. In 10 m long gallery's section a hihger temperature of foor and roof than on remining rock surfaces was assumed. The cosidered problem is described by a system of equations of continuity, Navier-Stokes and energy together with k-epsylon turbulence model. The calculations were performed for different wall temperatures of heated gallery's section. The flow field patterns, characterizing the respective stages of reverse flow expasion are analyzed. CFD code validation based on the experimental data were performed. The numerical calculations by the programme FLUENT 6.1 have been supported.
Access status: Restricted ,
Projekt instalacji centralnego ogrzewania domu jednorodzinnego wykorzystującej pompę ciepła typu grunt/woda
(Data obrony: 2012-01-31) Ferens, Katarzyna
Wydział Górnictwa i Geoinżynierii
Access status: Restricted ,
Projekt instalacji centralnego ogrzewania domu jednorodzinnego wykorzystującej pompę ciepła typu woda/woda
(Data obrony: 2012-01-31) Hałas, Anna
Wydział Górnictwa i Geoinżynierii
Access status: Restricted ,
Projekt instalacji klimatyzacyjnej dla hali produkcyjnej w przemyśle
(Data obrony: 2015-01-26) Kusz, Marta
Wydział Górnictwa i Geoinżynierii
Access status: Restricted ,
Projekt instalacji klimatyzacyjnej dla obiektu biurowego
(Data obrony: 2012-01-31) Zielińska, Anna
Wydział Górnictwa i Geoinżynierii
Access status: Restricted ,
Projekt instalacji wentylacji i klimatyzacji dla obiektu biurowego
(Data obrony: 2012-01-31) Popek, Kinga
Wydział Górnictwa i Geoinżynierii
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, Piotr
In 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.
Access status: Open Access ,
Transport wody rurociągami szybowymi w instalacjach chłodzenia powietrza w podziemnych wyrobiskach górniczych
(Wydawnictwa AGH, 2011) Filek, Krzysztof
A control of thermal hazard in underground mines is connected with cooling equipment utilization, Heat received from cooled air in excavations can be used on a surface. This article applies to problem of warm water transport from mine, with special consideration its pressure and temperature. The algebric equations of pressure distribution were shown and differential equations of temperature distribution in water lines were derived. Two numerical examples, which represented discussed problem, were solved - their results were presented in form of diagrams in two pictures.
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)
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)
Access status: Open Access ,
Wartości współczynników wymiany ciepła i masy w wentylatorowej wyparnej chłodnicy wody
(Wydawnictwa AGH, 2010) Nowak, Bernard; Filek, Krzysztof; Branny, Marian
Results 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.