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2016 Abstracts of the "Polska Energetyka Słoneczna" journal written in English:(Other abstracts are available only in Polish)

POLSKA ENERGETYKA SŁONECZNA Nr. 1-4/2016
Table of Contents:

PERFORMANCE OF THE PVT SOLAR COLLECTOR OPERATED WITH WATER –AL2O3 NANOFLUID - J. Cieśliński, B. Dawidowicz, J. Krzyżak
EFFECT OF DISTANCE OF PV MODULE FROM VERTICAL BUILDING WALL ON TEMPERATURE OF MODULE'S REAR WALL - A. Opiela, Z. Zapałowicz
ANALYSIS OF SOLAR HOT WATER INSTALLATION FUNCTIONING AS A PART OF HOSPITAL ENERGY SYSTEM (PART 1) - B. Asztemborski, R. Wnuk, A. Gajewska
ANALYSIS OF SOLAR HOT WATER INSTALLATION FUNCTIONING AS A PART OF HOSPITAL ENERGY SYSTEM (PART 2) - B. Asztemborski, R. Wnuk
Velocity and temperature field inside a passive solar air collector. Preliminary results of CFD analysis - J. Fiuk, K. Dutkowski
EXPERIMENTAL RESEARCH ON THE IMPACT OF THE APPLICATION OF FINS ON ABSORBER SURFACE ON THERMAL EFFICIENCY OF PASSIVE SOLAR AIR COLLECTOR - K. Dutkowski, J. Fiuk, P. Piątkowski
DEVELOPMENT OF SOLAR DISTRICT HEATING SYSTEMS AND IMPLEMENTATION OF FLAT PLATE SOLAR COOLECTORS - D. Chwieduk
THE ESTIMATION OF INFLUENCE OF EXTERIOR ROLLER SHUTTERS ON HEAT LOSS COEFICIENT THROUGH WINDOW - A. Węglarz, W. Tworek
THE ESTIMATION OF INFLUENCE OF EXTERIOR ROLLER SHUTTERS ON HEAT LOSS THROUGH WINDOW - A. Węglarz, W. Tworek
THEORETICAL ANALYSIS OF LATENT THERMAL ENERGY STORAGE SYSTEM WITH ADSORPTION CHILLER - J. Karwacki, R. Kwidziński
ON SOLAR HOUSES AND HOW THEY ARE DESIGNED - J. Koziński
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PERFORMANCE OF THE PVT SOLAR COLLECTOR OPERATED WITH WATER –AL2O3 NANOFLUID

J. Cieśliński, B. Dawidowicz, J. Krzyżak
Gdańsk University of Technology, Faculty of Mechanical Engineering

Abstract:
An experimental investigation of the hybrid module photovoltaic panel -solar collector (PVT) cooled by water-Al2O3 nanofluids has been conducted. The weight fractions of the nanoparticles were 1% and 3%. Thermal efficiency, power efficiency and overall efficiency have been determined for artificial source of light and sunlight. No noticeable effect of the nanoparticle concentration on the overall efficiency of the PVT module has been recorded while using water-Al2O3 nanofluids as a cooling medium. Moreover the reduction of the electrical power generated with increasing temperature of the module has been recorded.

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EFFECT OF DISTANCE OF PV MODULE FROM VERTICAL BUILDING WALL ON TEMPERATURE OF MODULE'S REAR WALL

A. Opiela, Z. Zapałowicz
Katedra Techniki Cieplnej, Wydział Inżynierii Mechanicznej i Mechatroniki, Zachodniopomorski Uniwersytet Technologiczny w Szczecinie

Abstract:
The paper presents experimental research results allowing to estimate the effect of distance of PV module from vertical building wall on mean daytime temperature of module's rear wall. Analysis of research results shows that the lowest values of excess temperature in relation to the air temperature at the input are obtained at longest distance values under research, that is 0,12 m.

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ANALYSIS OF SOLAR HOT WATER INSTALLATION FUNCTIONING AS A PART OF HOSPITAL ENERGY SYSTEM (PART 1)

B. Asztemborski, R. Wnuk, A. Gajewska
Krajowa Agencja Poszanowania Energii S.A.

Abstract:
Solar Domestic Hot Water System localised at Hospital and backed up by natural gas system was described. Mathematical formulas enabling the calculations of energy gains were presented. The working fluid flows through different collectors’ rows were monitored. The solar collectors are being shaded by surrounding different trees. The influence of shading on solar energy availability was evaluated. That influence and effect of different flows by collectors rows were confirmed by thermal video scan of solar collectors’ front surfaces.

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ANALYSIS OF SOLAR HOT WATER INSTALLATION’S FUNCTIONING AS A PART OF HOSPITAL ENERGY SYSTEM (PART 2)

B. Asztemborski, R. Wnuk
Krajowa Agencja Poszanowania Energii S.A.

Abstract:
The energy gains of Solar Domestic Hot Water System localised at Hospital were calculated using f-chart methodology. Distribution and accumulation losses were evaluated, which losses significantly affect the possessed from solar system useful energy. The measures improving efficiency of solar system are proposed. The conclusions coming out from different energy audits of solar systems, including presented in this article, are gathered. Many different errors of systems planning could be avoided that would result significant increase of system performance. The article is carrying its part 1 of the same title, where the installation and its technical condition were described and also the influence of trees’ shadow on its thermal performance was estimated.

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Velocity and temperature field inside a passive solar air collector. Preliminary results of CFD analysis

J. Fiuk, K. Dutkowski
Technical University of Koszalin, Department of Heat Enginnering and Refrigeration, Koszalin, Poland

Abstract:
This paper presents preliminary results of a CFD analysis of passive solar air collector. The geometry used in simulation is a representation of a prototype solar air collector which has been investigated experimentally in laboratory of Heat Engineering and Refrigeration Department of Koszalin University of Technology. The external dimensions of collector are 2 x 1 m (heigth x width). The absorber plate is flat. The set of experimental results is used in validation the numerical approximations of the flow field. Most notably, the mean velocity at inlet and temperatures can be easily compared between these two data sets, leading to a comprehensive conclusions. The numerical results are in agreement with experiment. The results revealed a behavior of fluid in the discussed geometry that promotes backflows and may be the cause of momentum loss.

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EXPERIMENTAL RESEARCH ON THE IMPACT OF THE APPLICATION OF FINS ON ABSORBER SURFACE ON THERMAL EFFICIENCY OF PASSIVE SOLAR AIR COLLECTOR

K. Dutkowski, J. Fiuk, P. Piątkowski
Technical University of Koszalin, Department of Heat Enginnering and Refrigeration, Koszalin, Poland

Abstract:
In this paper an experimental results on passive solar air collectors are presented. An impact of application of waveform fins on the absorber surface on thermal efficiency was investigated. The results were compared with experiment on passive solar air collector with flat absorber surface. The experiment was conducted under steady state artificial radiation conditions in a laboratory environment. This enabled the acquisition of differences in flow and thermal parameters of the two designs. At the experimental stand following parameters were measured: irradiance, air temperature at inlet and outlet to the collector, mean air velocity at the inlet duct of the collector. The impact of irradiance on temperature increase, volumetric flow rate and thermal efficiency is shown. It was established that thermal efficiency of the collector with expanded absorber surface in form of fins is 10-15% higher than the efficiency of flat absorber collector.

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DEVELOPMENT OF SOLAR DISTRICT HEATING SYSTEMS AND IMPLEMENTATION OF FLAT PLATE SOLAR COOLECTORS

D. Chwieduk
Instytut Techniki Cieplnej, Wydział Mechaniczny Energetyki i Lotnictwa, Politechnika Warszawska, Warszawa

Abstract:
The paper deals with presentation of present state and development of flat plate solar collectors and solar district heating systems. The role of flat plate solar solar collectors in solar district heating systems is underlined. Different classification of such systems is given and analyzed. The main elements of these systems are presented. Focus has been put on the storage and auxiliary source of energy and their connections to solar collectors and modes of cooperation. Implementation of solar district heating systems in Eurpe has been analyzed and the prospects for future deployment are given.

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THE ESTIMATION OF INFLUENCE OF EXTERIOR ROLLER SHUTTERS ON HEAT LOSS COEFICIENT THROUGH WINDOW

A. Węglarz, W. Tworek
Wydział Inżynierii Lądowej, Politechnika Warszawska

Abstract:
The paper presents characteristics of external blinds and their functionality with regards to: sun protection, heat loss reduction through windows, sound insulation, burglary protection as well as construction and types of external blinds. An evaluation of external blinds application impact on window heat factor has been done and further a method of determining the additional window thermal resistance with the external blinds closed according to PN-EN ISO 10077-1:2007 standard. Sample calculations were done which lead to the conclusion that the heat transfer coefficient of window with external blinds closed is over 21% more efficient that the heat transfer coefficient of window itself.

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THE ESTIMATION OF INFLUENCE OF EXTERIOR ROLLER SHUTTERS ON HEAT LOSS THROUGH WINDOW

A. Węglarz, W. Tworek
Wydział Inżynierii Lądowej, Politechnika Warszawska

Abstract:
In this paper we propose a method for calculation of limit size of heat loss according to current standards and technical regulations. The method takes into account some assumptions and simplifications thus it can be used in a variety of specific cases and the results can be easily compared. The research shows that the external blinds have an impact on the size of heat loss and that it depends on many factors such as: tightness of blinds and method of window arrangement.

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THEORETICAL ANALYSIS OF LATENT THERMAL ENERGY STORAGE SYSTEM WITH ADSORPTION CHILLER

J. Karwacki, R. Kwidziński
The Szewalski Institute of Fluid-Flow Machinery, Polish Academy of Sciences, Gdansk, Poland

Abstract:
The paper deals with a theoretical analysis of using thermal energy storage filled with Phase Change Material (PCM) to optimise adsorption chiller application. The lumped model equations were developed to analyse heat transfer dynamics inside cooling installation. Model equations result from energy balances of the chiller, PCM thermal storage and heat load. Influence of heat transfer fluid flowrate control, heat capacity of the system components as well as heat losses to the ambient were taken into account. This study shows the great potential of PCM storage unit to optimize cooling systems.

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ON SOLAR HOUSES AND HOW THEY ARE DESIGNED

J. Koziński
Laboratorium Dworku Polskiego

Abstract:
The article presents buildings built by the author’s business, which to large extent employ solar power to heating the houses during winter. In this light, he describes the solar installation design method which depends on a function based on average data regarding the power of temporary solar radiation in relation to sun altitude. The author presents how this function’s parameters relate to historical actinometric data measured for Berlin. He also makes a claim about this method being of great relevance for projects carried in Poland.

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