scholarly journals Penggunaan Solar Collector Sebagai Pemanas Awal Air Masuk dan Pemanas Tambahan Bawah Heat Absorber Pada Basin Solar Still Untuk Meningkatkan Efisiensi

POROS TEKNIK ◽  
1970 ◽  
Vol 8 (2) ◽  
pp. 68
Author(s):  
M. Syafwansyah Effendi ◽  
Ahmad Hendrawan ◽  
Noor Rahman
Keyword(s):  
Heat Exchanger ◽  
Solar Radiation ◽  
Solar Collector ◽  
Water Environment ◽  
Heat Energy ◽  
Solar Still ◽  
Glass Cover ◽  
Additional Heating ◽  
Heat Absorber ◽  
Better Than

All basin solar still in general use under the askew glass cover as condensation media toplace the condensate flows toward the lower sections with use gravitation. It is known thatwhen condensation occurs release considerable heat energy to environment. Solve thisproblem, in this research is to minimize the loss of substantial energy, utilizing the heat fromthe solar collector. Heat is supplied to the bottom of the heat absorber and heat exchanger.Research methods is experiment. In this research is examine both the prototype, that is basinsolar still with solar collector and basin solar still without solar collector. The measuredparameter is temperature button section heat absorber, outside heat absorber, buttonsection of glass cover, condensate water, environment, solar collector, heat exchanger andsoar radiation.In this result temperature average at button section heat absorber is 47,03oC for prototypewith solar collector and without solar collector is 45,25oC. Solar radiation average is 304,11W/m2. Efficiency both prototype is 29,45% with solar collector and 19,86% without solarcollector. By comparing efficiency two prototype is concluded that the Solar Collector aspreheater water and additional heating of water under heat absorber 67.45% better than thatwithout using Solar Collector.

scholarly journals A Review of New Solar Still Design Comprising a Five-Sided Glass Cover and Equipped with an External Tank for PCM

2021 ◽  
Vol 877 (1) ◽  
pp. 012038
Author(s):  
Abbas Sahi Shareef ◽  
Hayder Jabbar Kurji ◽  
Hassan Abdulameer Matrood
Keyword(s):  
Melting Point ◽  
Phase Change ◽  
Solar Collector ◽  
Phase Change Materials ◽  
Review Paper ◽  
Pure Water ◽  
Solar Still ◽  
Glass Cover ◽  
Solar Distillation ◽  
Change Material

Abstract Various human activities have led to the consumption of large quantities of pure water, which has led researchers to find efficient and economical methods for desalinating seawater and water containing impurities. In this review paper, solar energy where it is permanent, abundant and environmentally friendly, to produce pure water was discussed using a new solar distillation device, representing the paper’s novelty. The distillation was designed and used in the way led to increase efficiency and improve productivity by adding a solar collector to the system and equipped with a tank containing phase change material (PCM). It has a low melting point and can change the phase by absorbing the system’s latent heat to maintain the system’s temperature. Which contributes to increasing the distillation period even after sunset, thus increasing the daily productivity of freshwater. Using phase change materials will increase distillation hours from (3-4) hours after sunset, increasing the amount of production between (75 - 90) %.

scholarly journals Performance Evaluation of a Hybrid Solar Collector in Two Different Climates

2021 ◽  
Vol 1 (2) ◽  
pp. 17-20
Author(s):  
Ahssan M. A. Alshibil ◽  
Piroska Víg ◽  
István Farkas
Keyword(s):  
Performance Evaluation ◽  
Solar Radiation ◽  
Flat Plate ◽  
Electric Power ◽  
Solar Collector ◽  
Heat Energy ◽  
Climate Conditions ◽  
Plate Absorber ◽  
Beneficial Approach ◽  
Different Climates

The solar hybrid collector (PV/T) modules are a beneficial approach that simultaneously transforms solar radiation into heat and electric power. This work examined the performance of a PV/T module with flat-plate absorber type and water-cooled by optimizing the PV/T model under two significantly different climate conditions.  The first is for Stuttgart city, and the second is for Kabul. According to what has been conducted in this study, Kabul has a higher percentage of the received heat energy than Stuttgart, at more than 50.4%. Furthermore, Kabul's electrical efficiency is 48.3% higher than Stuttgart's. As a matter of fact, the annual radiation of Kabul is more than Stuttgart city by 49.12%. Thus, Kabul city seems to be more convenient than Stuttgart for the PV/T applications.

scholarly journals Pengaruh jumlah haluan pipa paralel pada kolektor surya plat datar absorber batu kerikil terhadap laju perpindahan panas

2016 ◽  
Vol 6 (2) ◽  
Author(s):  
M. Wirawan ◽  
R. Kurniawan ◽  
Mirmanto Mirmanto
Keyword(s):  
Renewable Energy ◽  
Solar Radiation ◽  
Solar Energy ◽  
Thermal Energy ◽  
Solar Collector ◽  
Alternative Energy ◽  
Mesh Size ◽  
The Other ◽  
Energy Crisis ◽  
Better Than

Recently the use of energy increases. It leads to the energy crisis. Therefore, it is important to promote alternative energy (renewable energy). One of renewable energies, which is potential in Indonesia, is solar enrgy. Solar energy can be harvested using a solar collector. This device can collect or absorb solar radiation and convert it to thermal energy. In this study, two identical collectors are used. One collector consists of 7 pipes and the other comprises 9 pipes. The overall dimension of the collector is 100 cm x 80 cm x 10 cm and the absorber of the collector is made of gravels with a mesh size of 9.5 -12.5 mm. The collectors are placed with a slope of 15o facing to North. The volumetric rates of water used in the experiments are 300 cc / min, 350 cc / min and 400 cc / min. The results show that the collector with 9 pipes is better than that with 7 pipes.

Using PCM, an Experimental Study on Solar Stills Coupled with and without a Parabolic Trough Solar Collector

2021 ◽  
Vol 21 (2) ◽  
pp. 45-52
Author(s):  
Hazim Jassim Jaber ◽  
Qais A. Rishak ◽  
Qahtan A. Abed
Keyword(s):  
Experimental Study ◽  
Phase Change ◽  
Phase Change Material ◽  
Solar Collector ◽  
Heat Energy ◽  
Solar Still ◽  
Parabolic Trough ◽  
Parabolic Trough Collector ◽  
Parabolic Trough Solar Collector ◽  
Change Material

Performance a double slope of the solar still Integrated With or without parabolic trough collector is investigated experimentally. To improve the output of a double slope solar still, a number of initiatives have been undertaken, using wax as a phase change material (PCM) with a parabolic trough collector. A parabolic trough collector (PTC) transfers incident solar energy to the solar still through a water tube connected to a heat exchanger embedded in used microcrystalline wax. Experiments were carried out after orienting the basin to the south and holding the water depth in the basin at 20 mm. According to the results obtained, the solar stills with parabolic trough collector have higher temperatures and productivity than solar stills without parabolic trough collector, as well as the ability to store latent heat energy in solar still, allowing fresh water to condense even after sunset. In addition, the parabolic trough collector with phase change material in the double slope solar improves productivity by 37.3 % and 42 %, respectively.

scholarly journals Heat Exchanger Network Retrofit of an Oleochemical Plant through a Cost and Energy Efficiency Approach

2021 ◽  
Vol 5 (2) ◽  
pp. 17
Author(s):  
Valli Trisha ◽  
Kai Seng Koh ◽  
Lik Yin Ng ◽  
Vui Soon Chok
Keyword(s):  
Energy Consumption ◽  
Heat Exchanger ◽  
Cost Effective ◽  
Capital Cost ◽  
Global Market ◽  
Annual Saving ◽  
Heat Exchanger Network ◽  
First Case ◽  
Payback Time ◽  
Better Than

Limited research of heat integration has been conducted in the oleochemical field. This paper attempts to evaluate the performance of an existing heat exchanger network (HEN) of an oleochemical plant at 600 tonnes per day (TPD) in Malaysia, in which the emphases are placed on the annual saving and reduction in energy consumption. Using commercial HEN numerical software, ASPEN Energy Analyzer v10.0, it was found that the performance of the current HEN in place is excellent, saving over 80% in annual costs and reducing energy consumption by 1,882,711 gigajoule per year (GJ/year). Further analysis of the performance of the HEN was performed to identify the potential optimisation of untapped heating/cooling process streams. Two cases, which are the most cost-effective and energy efficient, were proposed with positive results. However, the second case performed better than the first case, at a lower payback time (0.83 year) and higher annual savings (0.20 million USD/year) with the addition of one heat exchanger at a capital cost of USD 134,620. The first case had a higher payback time (4.64 years), a lower annual saving (0.05 million USD/year) and three additional heaters at a capital cost of USD 193,480. This research has provided a new insight into the oleochemical industry in which retrofitting the HEN can further reduce energy consumption, which in return will reduce the overall production cost of oleochemical commodities. This is particularly crucial in making the product more competitive in its pricing in the global market.

scholarly journals Synthesis of 2-Substitued Indoles via Pd-Catalysed Cyclization in an Aqueous Micellar Medium

Molecules ◽  
2021 ◽  
Vol 26 (13) ◽  
pp. 3917
Author(s):  
Sofia Siciliano ◽  
Elena Cini ◽  
Maurizio Taddei ◽  
Giorgia Vinciarelli
Keyword(s):  
Water Environment ◽  
Delivery Mode ◽  
Micellar Medium ◽  
Dielectric Heating ◽  
Microwave Dielectric ◽  
Microwave Dielectric Heating ◽  
Heating Mode ◽  
Aqueous Micellar Medium ◽  
By Products ◽  
Better Than

The synthesis of 2-substituted indoles starting from the corresponding unprotected 2-alkynylanilines was made possible in 3% TPGS-750-M water using Pd(OAc)2 alone as the catalyst. The reaction was sensitive to the heating mode respect to the nature of the starting material as, in many cases, convectional heating was better than microwave dielectric heating. The MW (microwave) delivery mode had also an influence in the formation of by-products and, consequently, product yields. A tandem Sonogashira-cyclisation reaction was also accomplished using Pd(OAc)2/Xphos in the nanomicellar water environment.

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