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1
Content available Modular heat storage in waste heat recovery installations
Górszczak Piotr, Rywotycki Marcin, Hojny Marcin, Filo Grzegorz
Archives of Thermodynamics
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2023
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Vol. 44, no 3
301--323
EN
The paper presents the methodology of designing a system for accumulating waste heat from industrial processes. The research aimed to analyse the fluid’s movement in the heat accumulator to unify the temperature field in the volume of water constituting the heat buffer. Using the computer program Ansys Fluent, a series of computational fluid dynamics simulations of the process of charging the heat storage with water at 60◦C, 70◦C, and 80◦C was carried out. The selected temperatures correspond to the temperature range of unmanaged waste heat. In the presented solution, heat storage is loaded with water from the cooling systems of industrial equipment to store excess heat and use it at a later time. The results of numerical calculations were used to analyse the velocity and temperature fields in the selected structure of the modular heat storage. A novelty in the presented solution is the use of smaller modular heat storage units that allow any configuration of the heat storage system. This solution makes it possible to create heat storage with the required heat capacity.
2
Content available Simulations of safety vales for fluid power systems
Domagała Mariusz, Momeni Hassan, Fabiś-Domagała Joanna, Filo Grzegorz, Lempa Paweł
System Safety : Human - Technical Facility - Environment
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2019
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Vol. 1, nr 1
670--677
EN
Hydraulic power systems are widely used in heavy machinery. Safety of such a systems have a major importance due to the fact that any failure may cause environmental contamination or serious injury. One of the component which protects hydraulic drive systems against excessive rising of working pressure is a safety valve which aim is to maintain pressure in the systems below acceptable level. Pressure control valves which plays important role in a hydraulic systems may have very simple or complex structure. Even in case of the simplest structure of such valve modeling is not an easy task. The new quality in designing hydraulic valves bring CFD method and FSI (Fluid Structure Interaction) methods.
3
Content available Matrix FMEA analysis as a preventive method for quality design of hydraulic components
Fabiś-Domagała Joanna, Momeni Hassan, Domagała Mariusz, Filo Grzegorz
System Safety : Human - Technical Facility - Environment
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2019
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Vol. 1, nr 1
684--691
EN
Preventive methods are important group of methods used in the process of design and which are known as quality design methods. The aim of these methods is identification of potential failures and cause-and-effect relationships in consistent and systematic way, and then taking appropriate preventive or corrective actions. The well-known examples of preventive methods also used for modelling and analysis of the criticality (risk) factor are FMEA analysis and FTA analysis. A matrix FMEA analysis method has been presented and discussed in the work. The basic assumptions related to this method were characterized and algorithms for each stages of analysis have been presented. It has been presented practical application of FMEA method on example of selected components of hydraulic system.
4
Content available Quality improvement of a safety valve with the use of numerical and experimental studies
Filo Grzegorz, Domagała Mariusz, Lempa Paweł, Fabiś-Domagała Joanna, Kwiatkowski Dominik, Momeni Hassan
Quality Production Improvement - QPI
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2019
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Vol. 1, Iss. 1
378--385
EN
This article presents results of numerical modelling, simulation and test bench experiments of a hydraulic direct-acting relief valve was used as a safety valve. The analyzed safety valve was placed in a system consisting of a fixed-speed pump, a control valve, a hydraulic cylinder as an actuator and a second pressure valve in the load line used as a payload generator for the cylinder. In the first step mathematical model of the system was formulated in the form of a system of ordinary differential equations. Next, simulation model was created in Matlab/Simulink. Simulations were carried out for different values of the actuator payload. The obtained results include time series of pressure, flow rate and displacement of the actuator piston. In order to confirm simulation results, a test bench was built and series of experiments were carried out. High compliance of simulation and laboratory results was obtained. It was confirmed that the proposed solution with the relief valve used as a safety valve fulfills its task of protecting the hydraulic system from excessive pressure increase.
5
Content available Quality improvement of a gear transmission by means of genetic algorithm
Lempa Paweł, Lisowski Edward, Masui Fumito, Filo Grzegorz, Ptaszynski Michal, Domagała Mariusz, Fabiś-Domagała Joanna
Quality Production Improvement - QPI
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2019
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Vol. 1, Iss. 1
386--393
EN
The article deals with the issue of quality improvement of a gear transmission by optimizing its geometry with the use of genetic algorithms. The optimization method is focused on increasing productivity and efficiency of the pump and reducing its pulsation. The best results are tested on mathematical model and automatically modelled in 3D be means of PTC Creo Software. The developed solution proved to be an effective tool in the search for better results, which greatly improved parameters of pump especially reduced flow pulsation.
6
Content available Numerical simulation of fluid flow inside the flow control valve
Domagała Mariusz, Momeni Hassan, Fabis-Domagała Joanna, Krawczyk Mariusz, Filo Grzegorz, Bikass Saeed
Quality Production Improvement - QPI
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2019
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Vol. 1, Iss. 1
394--399
EN
Hydraulic valves are widely used in many branches and they are still developed and improved. Due to the problem with verification of flow phenomena which appears during valves operation numerical simulations methods are tools which allows to improved valves design. This paper presents numerical simulation of fluid flow inside flow control valve.
7
Content available Matrix FMEA analysis of the flow control valve
Fabis-Domagala Joanna, Momeni Hassan, Domagala Mariusz, Filo Grzegorz, Bikass Saeed, Lempa Paweł
Quality Production Improvement - QPI
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2019
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Vol. 1, Iss. 1
590--595
EN
Reliability is a key feature in engineering systems and might be improved by using preventive methods, which allows for identification potential failures and establishing cause-and-effect relationships in consistent and systematic way. One of the popular quality improvement method is FMEA (Failure Modes and Effects Analysis). An application of matrix FMEA analysis method on example of flow control valve has been presented and discussed in the work. Presented example shows also a different ways of evaluating failures and theirs influence on analysis results.
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