scholarly journals EFFECTIVE OPERATION INVESTIGATION OF UNGLAZED SOLAR AIR COLLECTOR / NEĮSTIKLINTO ORINIO SAULĖS KOLEKTORIAUS EFEKTYVAUS VEIKIMO TYRIMAS

2016 ◽  
Vol 8 (4) ◽  
pp. 443-448
Author(s):  
Dovydas Rimdžius ◽  
Vytautas Martinaitis ◽  
Juozas Bielskus
Keyword(s):  
Solar Collector ◽  
Ventilation System ◽  
Environmental Engineering ◽  
Coefficient Of Performance ◽  
Flow Conditions ◽  
Operation Analysis ◽  
Operation Conditions ◽  
Solar Air Collector ◽  
Effective Operation ◽  
Energy Quantity

The article presents results of an effective operation analysis of VGTU Environmental Engineering Faculty southern facade integrated unglazed transpired solar collector. During previous research the importance to evaluate influence to ventilation system by such type of collectors was observed. The assessment of analysed collector aerodynamics showed that under specific solar radiation and air flow conditions the amount of energy generated by collector could be smaller than the energy quantity consumed by fans for air suction. The study provides analysis of the coefficient of performance rates and quantities of generated and consumed energy under different operation conditions. The effective operation conditions of collector committed during this research could be useful for designing or creating algorithm for such device. Straipsnyje pristatoma VGTU Aplinkos inžinerijos fakulteto pietiniame fasade integruoto neįstiklinto orinio saulės kolektoriaus efektyvaus veikimo analizė bei jos rezultatai. Ankstesnio tyrimo metu pastebėta, kad, analizuojant tokio tipo kolektorių, svarbu atsižvelgti į jo poveikį vėdinimo sistemai. Įvertinus analizuojamojo kolektoriaus aerodinamines savybes, nustatyta, kad, esant tam tikroms oro srautų ir saulės spinduliuočių vertėms, įrenginio pagamintas energijos kiekis gali būti mažesnis už orui siurbti naudojamų ventiliatorių vartojamą energijos kiekį. Tyrime pateikiama kolektoriaus energijos transformavimo rodiklių bei pagamintų ir suvartotų energijos kiekių kitimo analizė, esant skirtingiems veikimo režimams. Nustatyti kolektoriaus efektyvaus veikimo režimai gali būti naudingi projektuojant ar kuriant tokio tipo įrenginių valdymo algoritmą.

Maximization of Solar Gains of an Air Collector by Simulations

2013 ◽  
Vol 284-287 ◽  
pp. 483-487 ◽  
Author(s):  
Ondrej Sikula ◽  
Vit Merka ◽  
Jiri Hirs ◽  
Josef Plášek
Keyword(s):  
Heat Transfer ◽  
Solar Energy ◽  
Solar Collector ◽  
Cfd Simulations ◽  
Ansys Fluent ◽  
Operation Conditions ◽  
Flow And Heat Transfer ◽  
Solar Air Collector ◽  
Computational Fluid Dynamics Cfd ◽  
The Impact

The paper deals with numerical simulations of the impact of design, shading, positioning and orientation of a solar air collector an efficiency of exploitation of solar energy. The solar collector is used to preheat of an air, which then is supplied into the building. There are various requirements for solar air collectors. We are focused on maximization of solar energy gain by optimizing geometry, orientation and positioning of a solar air collector. To achieve the desired objective was a combination of two methods used. The firs one is Computational Fluid Dynamics (CFD) simulations of flow and heat transfer by convection, conduction and radiation in software ANSYS Fluent. The second one is the numerical simulation of the annual operations of the collector in the software BSim. The result of this work is an optimal design and operation conditions of the air collector.

scholarly journals Determining the Effect of Inlet Flow Conditions on the Thermal Efficiency of a Flat Plate Solar Collector

Fluids ◽  
2018 ◽  
Vol 3 (3) ◽  
pp. 67 ◽  
Author(s):  
Mohammad Alobaid ◽  
Ben Hughes ◽  
Andrew Heyes ◽  
Dominic O’Connor
Keyword(s):  
Flat Plate ◽  
Thermal Efficiency ◽  
Solar Collector ◽  
Maximum Temperature ◽  
Inlet Temperature ◽  
Flow Conditions ◽  
Riser Pipe ◽  
Computational Fluid Dynamics Cfd ◽  
Flat Plate Solar Collector ◽  
Feed Temperature

The main objective of this study was to investigate the effect of inlet temperature (Tin) and flowrate ( m ˙ ) on thermal efficiency ( η t h ) of flat plate collectors (FPC). Computational Fluid Dynamics (CFD) was employed to simulate a FPC and the results were validated with experimental data from literature. The FPC was examined for high and low level flowrates and for inlet temperatures which varied from 298 to 373 K. Thermal efficiency of 93% and 65% was achieved at 298 K and 370 K inlet temperature’s respectively. A maximum temperature increase of 62 K in the inlet temperature was achieved at a flowrate of 5 × 10−4 kg/s inside the riser pipe. Tin and m ˙ were optimised in order to achieve the minimum required feed temperature for a 10 kW absorption chiller.

Experimental Field Study of Green Tower Setup

2015 ◽  
Vol 1113 ◽  
pp. 782-788
Author(s):  
Zainoor Hailmee Solihin ◽  
Wirachman Wisnoe
Keyword(s):  
Temperature Distribution ◽  
Field Study ◽  
Solar Collector ◽  
Convective Flow ◽  
Thermal Power ◽  
Practical Experience ◽  
Solar Irradiation ◽  
Solar Thermal Power ◽  
Experimental Field ◽  
Solar Air Collector

A Green Tower for setup a pilot experiment consists of the solar collector and the tower was built. The temperature distribution of the Green Tower was measured and analyzed. The data of the highest experimental temperature inside the Green Tower collector’s reached was 52oC at 1300 hours at solar irradiation received of 623W/m2 respectively, with the ambient temperature at 31 oC. The Green Tower that used solar thermal power and utilizing a combination of solar air collector using the principal of solar oven and central updraft tube to generate a solar induced convective flow, which drives pressure to develop artificial wind. This paper presents the experimental field study and practical experience of the Green Tower. The discussion on temperature distribution and also updraft wind of the Green Tower is described and then the results from the designing, building and experimental are presented. The results and suggestions for the future reference will also be discussed.

Transient Modeling of a Lithium Bromide – Water Absorption Chiller

2013 ◽  
Vol 388 ◽  
pp. 83-90 ◽  
Author(s):  
Ang Li ◽  
Wai Soong Loh ◽  
Kim Choon Ng
Keyword(s):  
Water Absorption ◽  
Cooling Tower ◽  
Lithium Bromide ◽  
Cooling Water ◽  
Coefficient Of Performance ◽  
Absorption Chiller ◽  
Transient Model ◽  
Operation Conditions ◽  
Operation Process ◽  
Main Components

This article presents a thermodynamic framework for a lithium bromide – water absorption chiller, in which a transient model is developed to simulate the operation process. Local energy and mass balance within the main components like absorber, regenerator, condenser, evaporator and solution heat exchanger is respected to investigate the behavior of the chiller. Experimental correlations are used to predict heat transfer of the related working fluids. The cooling water is set to typical cooling tower conditions of tropical countries such as Singapore. The coefficient of performance (COP) is evaluated against a range of heat source temperatures from 75oC to 100oC. The results indicate the operation conditions of the chiller at its maximum COP is 95oC to 100oC.

Experimental Study on a Solar Powered Two-Stage Solid Wheel Desiccant Air Conditioning System

2012 ◽  
Vol 516-517 ◽  
pp. 1111-1116 ◽  
Author(s):  
Tong Hua Zou ◽  
Rong Yu ◽  
Lei Yan ◽  
Fa Li Cao
Keyword(s):  
System Performance ◽  
Electric Energy ◽  
Fundamental Principle ◽  
Coefficient Of Performance ◽  
Test Case ◽  
Two Stage ◽  
Electric Energy Consumption ◽  
Operation Conditions ◽  
Sorbent Materials ◽  
New Formulation

A new formulation, that employs both two-stage dehumidification and intercooler to effectively enhance system performance is proposed and investigated experimentally. The paper briefly describes desiccant wheel including the coupled fundamental principle and overall structure originally. An experimental setup is subsequently designed and built to evaluate the system performance under various operation conditions. The effects of different fresh air intake temperature at various regeneration temperature under given conditions are numerically analyzed and explained. Finally, results of a test-case are presented, indicating compared with the common single-stage system, an increase in humidity removal. Meanwhile, increasing regeneration air volume and temperature can significantly improve the dehumidification ability for sorbent materials and coefficient of performance of the system respectively, as well as save indirectly electric energy consumption, which is derived from the energy-intensive regeneration blower.

scholarly journals System Design of Solar Absorption Cooling : A Case Study in Building of Engineering Physics Department UGM

KnE Energy ◽  
2015 ◽  
Vol 2 (2) ◽  
pp. 22
Author(s):  
Andang Widiharto ◽  
Didit Setyo Pamuji ◽  
Atik Nurul Laila ◽  
Fiki Rahmatika Salis ◽  
Luthfi Zharif ◽  
...  
Keyword(s):  
Global Warming ◽  
Solar Collector ◽  
Air Conditioning ◽  
Cooling System ◽  
Renewable Energy Sources ◽  
Coefficient Of Performance ◽  
Thermal Coefficient ◽  
Solar Absorption ◽  
Absorption Cooling ◽  
Solar Absorption Cooling

<p>Air conditioning (AC) is one of the most building’s energy consumer, included in building of Engineering Physisc’s Departement, Universitas Gadjah Mada (UGM). The declining of fossil fuel reserves and the increasing effects of global warming, forcing the world to switch to renewable energy sources. This paper discusses the design of solar absorption cooling system to replace conventional AC in seven lecture halls of Engineering Physic’s Departement, UGM. There are some steps that have been done to design the solar absorption cooling, i.e. do a study of the potential availability of solar energy, calculate the cooling loads, analyze the thermodynamic process of the system, determine the type of collector to be used and calculate area of solar collector needed. The thermal coefficient of performance (COP) of the system designed was about 0.84 which could use some types of flat plate solar collector with each area corresponding to each efficiency values. </p><p><strong>Keyword</strong> : Air conditioning; global warming; solar absorption cooling; solar collector</p>

scholarly journals KINERJA KOLEKTOR TIPE PLAT DATAR PADA MESIN PENDINGIN ADSORPSI TENAGA SURYA DI KOTA MEDAN

2018 ◽  
Vol 7 (2) ◽  
pp. 94
Author(s):  
Tulus Burhanuddin Sitorus
Keyword(s):  
Solar Collector ◽  
Statistical Study ◽  
Cooling System ◽  
Weather Conditions ◽  
Coefficient Of Performance ◽  
Total Solar Radiation ◽  
Collector Efficiency ◽  
Powder Activated Carbon ◽  
Adsorption Cooling System ◽  
Flat Plate Collector

The performance of a flat plate collector on adsorption refrigerator driven by the solar collector was investigated in the present work. Based on a study conducted no researcher studies the performance of solar collectors used in adsorption cooling system. The adsorbent used in the collector was 20 kg ordinary powder activated carbon of coconut shell produced in the Sumatera Utara province of Indonesia, 5 liters of methanol as adsorbate and 6 liters of water as the medium that was cooled. The experiments were carried out under varying weather conditions with total solar radiation about 12619-17807 kJ/m2/cycle in Medan city. The experimental results show that the values of collector efficiency obtained were about 52.11-53.92%. The values of coefficient of performance (COP) obtained were in the range of 0.0318-0.0449. The results of the statistical study suggest that the effect of the weather conditions on collector efficiency thereabout 96%.

scholarly journals Air-to-Water Heat Pump Operation Analysis

2020 ◽  
Author(s):  
Ljubomir Malić ◽  
◽  
Aleksandra Paunović ◽  
Uroš Milovančević ◽  
Milena Otović
Keyword(s):  
Theoretical Analysis ◽  
Heat Pump ◽  
Mechanical Engineering ◽  
Thermodynamic Cycle ◽  
Coefficient Of Performance ◽  
Reciprocating Compressor ◽  
Heating Season ◽  
Pump Operation ◽  
Operation Analysis

The aim of this paper is a theoretical analysis of the operation of an air-to-water heat pump located in the Labo-ratory for Thermal Science at the Faculty of Mechanical Engineering in Belgrade. This results provide the basis for further experimental analyzes of this installation.The paper gives a comparative overview of the performance of a scroll and reciprocating compressor when pro-pane (R290) is used as a refrigerant. Also, the analysis of the influence of internal subcooling on the thermodynamic cycle is presented. Finally, according to the developed model of the heat pump performances investigation, the change in the average values of Coefficient of Performance (COP) during the average heating season, forthe period 2014 –2018, is shown.

Design, Construction and CFD Modeling of a Banana-Solar Dryer With Double Pass Solar Air Collector

2020 ◽  
Author(s):  
Philemon Mutabilwa ◽  
Kevin N. Nwaigwe
Keyword(s):  
Solar Collector ◽  
Cfd Modeling ◽  
Outlet Temperature ◽  
Cfd Model ◽  
Double Pass ◽  
Solar Dryer ◽  
Solar Air Collector ◽  
Aluminum Pipe ◽  
Drying Chamber ◽  
Design Construction

Abstract A work on the design, construction and computational fluid dynamics modelling of a solar dryer with a double pass solar air collector is presented. Using fundamental relationships, an indirect solar dying system for drying banana was designed and constructed. The system consists of a drying chamber and a double pass solar collector (DPSC), connected together with a flexible aluminum pipe. The system features a unique arrangement, as the drying chamber is underneath the double pass solar collector, and the solar collector itself can be adjusted to an angle of 0° up to 35° the maintenance or research purpose. The DPSC has five longitudinal fins, lying parallel with air flow. The solar dryer is incorporated with a convective DC fan that sucks hot air from the solar collector on to the drying chamber. The DPSC achieved an optimal peak outlet temperature of 345K with a maximum operational efficiency of 72.5%. A computational fluid dynamic (CFD) model is achieved for prediction of the dryer temperature and 3D airflow distribution within the dryer unit using ANSYS 18.2. The CFD model was validated using experimental data. The developed dryer demonstrated improved efficiency over similar dryers, and this is attributable to the unique arrangement of component parts.

Review on Solar Collector for Agricultural Produce

2018 ◽  
Vol 9 (1) ◽  
pp. 414 ◽  
Author(s):  
Ahmad Fudholi ◽  
Kamaruzzaman Sopian
Keyword(s):  
Solar Energy ◽  
Thermal Energy ◽  
Solar Collector ◽  
Energy Systems ◽  
Exergy Efficiency ◽  
Solar Collectors ◽  
Agricultural Produce ◽  
Essential Components ◽  
Energy And Exergy ◽  
Solar Air Collector

<span>Among the most important components of solar energy systems, solar collectors are devices that receive solar energy and convert it into thermal energy, as most essential components of solar dryer. This review presents description and previous work performed on performances of solar air collector for agricultural produce. In addition, various solar collectors are classified and described. Solar air collectors for drying application of agricultural produce are presented and summarize. The energy and exergy efficiency of the solar air collector ranges from 28% to 62% and from 30% to 57%, respectively. </span>

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