Experimental investigation of heat transfer during pool boiling two nanofluids, i.e., water-Al2O3 and water-Cu has been carried out. Nanoparticles were tested at the concentration 0.01%, 0.1%, 1% by weight. The horizontal smooth copper stainless steel tubes having 10 mm OD 0.6 wall thickness formed test heater. experiments have performed to establish influence nanofluids as well tube surface material on characteristics atmospheric pressure. results indicate that independent nanoparticle...

This paper presents the results of experimental research carried out on an organic Rankine cycle (ORC) system with two volumetric expanders running in serial and parallel mode. Both tested had a nominal power 1 kWe. The heat source used was boiler 35 kWt, powered by wood biomass. main aim study to determine parameters isentropic efficiency operating ORC, when connected series or parallel. analysis showed that maximum thermal mode 3.07%, about 3.31%. second-law 8.82% 9.53% respectively. When...

This paper deals with pool boiling of water–Al2O3 and water–Cu nanofluids on porous coated, horizontal tubes. Commercially available stainless-steel tubes having 10 mm outside diameter 0.6 wall thickness were used to fabricate a test heater. Aluminum coatings 0.15 thick porosity about 40% produced by plasma spraying. A smooth tube served as reference tube. The experiments conducted under different absolute operating pressures 200 kPa, 100 kPa. Nanoparticles tested at concentrations 0.01%,...

This article discusses the research conducted on a small CHP ORC system, which has been developed with aim of using it in single-family houses. The electric and thermal power system is 2.5 kWe 25 kWt, respectively. A working prototype was built 2014 since then subject different kinds studies. results preliminary show that functions properly achieves its predicted performance. carried out laboratory conditions usually differ from real operating conditions. presents further testing intended to...

The article presents the results of vibroacoustic research on a prototypical 4-stage radial microturbine and scroll expander operating in organic Rankine cycle with low-boiling fluid HFE7100. high-speed microturbogenerator had electrical capacity 3 kW e at nominal speed 24000 rpm. low-speed 1 3600 rpm was made by Air Squared. frequency characteristics overall vibration level (vibration velocity Vrms) measurements were conducted for both expander, depending rotational power consumption energy...

In recent years, organic Rankine cycle (ORC) micro-turbine distributed energy systems have become increasingly popular. Design methods for this type of fluid-flow machinery are still being developed. paper, a 2.5-kW radial-flow four-stage ORC with HFE7100 is experimentally and numerically analysed. CFX ANSYS was used the numerical analysis as well computational fluid dynamics (CFD) in-house code based on finite volume discretisation Godunov-type upwind differencing, high-resolution...

Advances in the development of analysis and design methods for fluid-flow machines have enabled both their multi-criteria optimisation miniaturisation. To decrease size such a machine whilst, at same time, maintaining its output power level, rotor’s rotational speed needs to be increased. It is reason serious difficulties with respect rotor dynamics selection bearing system. This article discusses simulation experimental research carried out on prototypical microturbine, designed use...

Abstract The paper presents the results of experimental investigations ORC system with two scroll expanders which have been used as a source electricity. Theworking fluidwas HFE7100 – newly engineered fluid unique heat transfer and favourable environmental properties. In three exchangers were (evaporator, regenerator, condenser) before droplet separator was installed. As an innovative biomass boiler used. Studies carried out for worked in series parallel. thermal fluidflow properties...

Abstract The paper deals with pool boiling of water-Al2O3 and water- Cu nanofluids on rough porous coated horizontal tubes. Commercially available stainless steel tubes having 10 mm outside diameter 0.6 wall thickness were used to fabricate the test heater. tube surface was roughed emery 360 or polished abrasive compound. Aluminium coatings 0.15 thick porosity about 40% produced by plasma spraying. experiments conducted under different absolute operating pressures, i.e., 200, 100, kPa....

Experimental investigation of heat transfer during pool boiling two nanofluids, i.e. water-Al 2 O 3 and water-Cu has been carried out.Nanoparticles were tested at the concentration 0.01%, 0.1%, 1% by weight.The horizontal smooth stainless steel tubes having 10 mm OD 0.6 wall thickness formed test heater.The experiments have performed to establish influence nanofluids on characteristics different absolute operating pressure values, 200 kPa, ca. 100 kPa (atmospheric pressure) kPa.It was...

The paper presents the results of experimental investigation ORC system with a droplet separator (which was used to improve quality working medium vapour), radial microturbine and multi-fuel boiler. research aimed at verifying correctness prototype performance in installation, equipped heat source form During these tests, detailed assessment functioning boiler has been devoted more attention. contains characteristics exchangers installation that were obtained for variant using regenerative...

The purpose of the work was to experimentally determine characteristics prototype a Roto-Jet pump (the Pitot tube pump) during its operation under conditions typical for domestic micro power plant.The low-boiling fluid, sold trade name HFE7100 and characterised by zero ozone depletion potential (ODP) coefficient, used as working medium in organic Rankine cycle (ORC).An electric thermal oil heater with maximum 2×24 kWe heat source.The type specially designed following rated parameters...

The article presents the results of study conducted on a microturbogenerator with nominal power 1 kWe. One primary objectives was to determine maximum for several preset and constant flow rates HFE-7100 working medium. During tests, variable parameters were heat source electrical load microturbine generator. Such methodological approach made it possible experimental mechanical characteristics high-speed microturbogenerator, which are practically absent in subject literature at present. shows...

The West Pomeranian Province is located at the Baltic Sea coast in west-north of Poland. This region combines commercial role with tourist and spa functions. Several attractions like clean rivers lakes (6% area), forests (mainly pine occupying 34.5% area) as well northern border which coastline (184.9 km) have contributed to development health resorts (Świnoujście, Kołobrzeg, Połczyn Zdrój), recreational tourism (the seaside lake resorts). counties (poviats) on generate almost 65% entire...

The paper presents the results of experimental investigation on ORC system with a droplet separator (which was used to improve quality working medium vapour) and two scroll expanders, which operated individually. research aimed at verifying correctness expanders performance in installation, equipped electric flow heater for thermal oil as heat source. contains characteristics exchangers installation that were obtained variant using regenerative cycle. tests conducted selected rates various...