Abstract Adsorption refrigeration systems are able to work with heat sources of temperature starting 50 °C. The aim the article is determine whether in terms technical and economic issues adsorption equipment can as elements that produce cold using hot water from district heating network. For this purpose, examined was air conditioning cooperating drycooler, opportunities offered by network Warsaw during summer. It turns out efficiency device perspective not sufficient for production even...

Abstract Metal matrix composites (MMCs) are still scarcely described due to various combinations of used materials and a wide array technologies. Applying the Failure Mode Effect Analysis (FMEA) method describe quality metal composite castings may contribute eliminating specific (characteristic only these materials) defects. This part analysis determines criticality numbers, meaning frequency given failure, detectability level significance failure group casting failures. It contributes...

The steam condenser is one of the most important element in whole power plant installation. Their proper design and operation makes a significant contribution to efficiency electricity production. purpose this article propose two-dimensional mathematical model that allows modeling work. In model, tube bundle treated as porous bed. analysis has been subjected two passes with capacity 50 MW. was compared results experimental studies. average error between experiment for difference cooling...

The diameter and configuration of tubes are important design parameters power condensers. If a proper tube is applied during the unit, high energy efficiency condenser itself can be achieved performance whole generation unit improved. assembly to replaced, one should verify whether chosen correct. Using that too large increases heat transfer area, leading over-dimensioning higher costs building condenser. On other hand, if small, water flows faster through tubes, which results in larger flow...

Variable working conditions of a double-tube counter-flow heat exchanger were analysed. During operation the exchanger, parameters (temperatures and mass flow rates) both fluids at its inlet change, which leads to change in performance. Heat transfer effectiveness is commonly used assess performance, defined as ratio actual maximum rate. In present paper, was considered be ‘black box’, aim investigate how rates fluids) affect outlet ones fluids), thus attempt introduce new relation for...

Sea-going ships are unique systems, and each ship—even those which mass-produced—are different. Once in service, they subjected to environmental exposure due a variety of factors, including, but not limited to, their mode operation, sailing area, cargo, hydrometeorological conditions, crew training, etc. This makes it very difficult, if impossible, compare individual units. The aim this study is present the damage data analysis selected vessel—a complex technical system—during its first year...

A steam condenser is an important component of a power plant, in which the heat condensation discharged to environment. Changes inlet temperature and mass flow rate cooling water affect pressure, has significant impact on efficiency generated low-pressure (LP) part turbine. On basis data obtained from simulator actual measurement 200-MW analysis was performed how temperature, rate, effectiveness, flow, pressure condenser, LP In case exchangers with zone, e.g. regenerative exchanger, maximum...

Abstract The aim of the study was to examine efficiency thermal wave type adsorption refrigerating equipment working on a pair activated carbon and methanol. Adsorption units can work in trigeneration systems applications driven by waste heat. They be built also as part hybrid sorption-compressor systems, they are very popular solar refrigeration energy storage units. device examined this operates special mode called wave. This allows achieve higher rates than normal operation, significant...

Abstract The internal diameter of a tube in ‘church window’ condenser was estimated using an entropy generation minimization approach. adopted model took into account the due to heat transfer and flow resistance from cooling-water side. Calculations were performed considering two equations for coefficient four different roughness values tube. Following analysis, obtained range 17.5 mm 20 (the current is 22 mm). calculated depends on positively related assumed model.

Abstract A steam generator in a nuclear power plant with light water reactor is heat exchanger, which the being transferred from primary to secondary loop (it links and loops). When running, inlet parameters (temperatures mass flow rates) on both sides of can change. It important know how changes these affect performance. The complexity processes taking place makes it difficult create simulator reflecting its performance under changed conditions. In order simplify task, was considered as...

Abstract The main object of interest was a typical fuel assembly, which constitutes core the nuclear reactor. aim paper is to describe phenomena and calculate thermal-hydraulic characteristic parameters in assembly for European Pressurized Reactor (EPR). To perform calculations, RELAP5 code used. This allows simulate steady transient states reactor applications. It also an appropriate calculation tool event loss-of-coolant accident light water reactors. model with nodalization (Reactor...

Abstract Development of electronics, which aims to improve the functionality electronic devices, at increasing packing transistors in a chip and boosting clock speed (the number elementary operations per second). While pursuing this objective, one encounters growing problem thermal nature. Each switching logic state level an integrated circuit is associated with generation heat. Due large high speeds, higher heat flux emitted by microprocessor where component needs be intensively cooled, or...