Solar-Powered/Fuel-Assisted Rankine Cycle Power and Cooling System: Sensitivity Analysis

1984 ◽  
Vol 106 (4) ◽  
pp. 447-456 ◽  
Author(s):  
N. Lior ◽  
K. Koai
Keyword(s):  
Sensitivity Analysis ◽  
Cooling System ◽  
Rankine Cycle ◽  
Energy Performance ◽  
System Configuration ◽  
System Sensitivity ◽  
Average Value ◽  
Climatic Regions ◽  
The Subject ◽  
Solar Powered

The subject of this analysis is a solar power/cooling system based on a novel hybrid steam Rankine cycle. Steam is generated by the use of solar energy collected at about 100°C, and it is then superheated to about 600°C in a fossil-fuel-fired superheater. The addition of about 20–26 percent of energy as fuel doubles the power cycle’s efficiency as compared to organic fluid Rankine cycles operating at similar collector temperatures. A sensitivity analysis of the system’s performance to the size and type of its components was performed by a transient (hourly) computer simulation over the month of August in two representative climatic regions (Washington, D.C. and Phoenix, Ariz.), and led to the description of a system configuration which provides optimal energy performance. The newly designed turbine’s predicted efficiency is seen to be essentially invariant with system configuration, and has a monthly average value of about 73 percent.

Solar-Powered/Fuel-Assisted Rankine-Cycle Power and Cooling-System: Simulation Method and Seasonal Performance

1984 ◽  
Vol 106 (2) ◽  
pp. 142-152 ◽  
Author(s):  
N. Lior ◽  
K. Koai
Keyword(s):  
Cooling System ◽  
Rankine Cycle ◽  
Simulation Method ◽  
Climatic Regions ◽  
Organic Rankine Cycles ◽  
The Subject ◽  
And Performance ◽  
Solar Powered ◽  
Solar Cooling System ◽  
Hourly Basis

The subject of this analysis is a solar cooling system based on a novel hybrid steam Rankine cycle. Steam is generated by the use of solar energy collected at about 100° C, and it is then superheated to about 600° C in a fossil-fuel-fired superheater. The addition of about 20–26 percent of fuel doubles the power cycle’s efficiency as compared to organic Rankine cycles operating at similar collector temperatures. A comprehensive computer program was developed to analyze the operation and performance of the entire power/cooling system. Transient simulation was performed on an hourly basis over a cooling season in two representative climatic regions (Washington, D.C. and Phoenix, Ariz.). One of the conclusions is that the seasonal system COP is 0.82 for the design configuration and that the use of water-cooled condensers and flat-plate collectors of higher efficiency increases this value to 1.35.

scholarly journals Design and Fabrication of Solar Powered Vapour Absorption Refrigeration System

2020 ◽  
Vol 170 ◽  
pp. 02011
Author(s):  
Varun Yadav ◽  
Supradeepa Panual G ◽  
Neeraj Yadav ◽  
Ratnam Bordia ◽  
Rohini Soni ◽  
...  
Keyword(s):  
Solar Energy ◽  
Cooling System ◽  
Energy Performance ◽  
Operating Conditions ◽  
Air Conditioner ◽  
Absorption Refrigeration ◽  
Refrigeration System ◽  
Evaporator Temperature ◽  
Absorption Refrigeration System ◽  
Solar Powered

Engineering is all about the application of knowledge and ideas for continuous development in society. In today’s world, there is a strong need for an environment-friendly refrigerating system, therefore, our focus is on a solar powered vapour absorption refrigeration system. This project focuses on a cooling system that minimizes the dependency over electricity and to show our ability to save our resources for future generations. The objective of this work was to design and fabricate a vapour absorption refrigeration system, using LiBr-H20, as the refrigerants and powered by solar energy. Performance Evaluation of the system has been done on the basis of different operating conditions and parameters like, solar irradiance, collector, generator, condenser and evaporator temperature. The COP of the system was obtained as 0.1 and the capacity was 0.01 TR. Since it’s an ab-initio development it will be a unique one in terms of understanding and underlying engineering. The system is an eccentric one that can be operated by multiple heat sources like solar energy, biomass etc. without much change in the design. This system can be used to develop an Air Conditioner, Refrigerator or a Chiller.

PENINGKATAN KEMAMPUAN MENYIMAK CERITA MELALUI PENERAPAN MODEL PEMBELAJARAN TIM PENDENGAR PADA MATA PELAJARAN BAHASA INDONESIA SISWA KELAS V SD NEGERI 007 PAGARAN TAPAH DARUSSALAM KABUPATEN ROKAN HULU

2017 ◽  
Vol 6 (1) ◽  
pp. 24
Author(s):  
Gusliarni Gusliarni
Keyword(s):  
Data Collection ◽  
Learning Model ◽  
Listening Skills ◽  
Class V ◽  
Average Ability ◽  
Average Value ◽  
The Subject ◽  
Data Collection Technique ◽  
Academic Year ◽  
Bahasa Indonesia

This research is motivated by the lack of listening skills obtained by the students, it is seen from the results of an assessment of the listening skills of students still achieved an average grade 56.32 or reach under the KKM predetermined value is 70. This study aims to determine whether the Team Learning model Listener can improve listening skills of students in the subject of Indonesian student Class V SD Negeri 007 Pagaran Tapah Darussalam Rokan Hulu. The subjects were 38 students in the academic year 2014-2015. Form of research is classroom action research. The data collection technique used is the technique of test and non test. Based on the results, it can be concluded that the ability to listen to the story class V students of SD Negeri 007 Pagaran Tapah Darussalam Rokan Hulu can be improved by applying the learning model listener team. On average ability to listen to stories of students in the early test is average with the average value of 56.32 by the medium category, and in the first cycle rose to 69.47 in the medium category, while in the second cycle listening skills of students categorized as high with the percentage of the average value of 76, 58 with a high category. Therefore, the success rate has exceeded 70 of the total number of students, which means that most students have achieved success predetermined value (minimum 75%).

PENERAPAN METODE DISKUSI UNTUK MENINGKATKAN HASIL BELAJAR MATEMATIKA SISWA KELAS I SDN 004 TEMBILAHAN KOTA KECAMATAN TEMBILAHAN KABUPATEN INDRAGIRI HILIR

2018 ◽  
Vol 2 (2) ◽  
pp. 173
Author(s):  
Jaimah Jaimah
Keyword(s):  
Action Research ◽  
Initial Data ◽  
Learning Outcomes ◽  
Learning Process ◽  
Mathematics Learning ◽  
First Grade ◽  
Average Value ◽  
Concrete Objects ◽  
The Subject ◽  
Classroom Action Research

The background of this research is the low of mathematics learning result of grade 1 student of SDN 004Tembilahan Kota, for that done perbaiakan learning process by applying method of discussion. This researchwas conducted in SDN 004 Tembilahan Kota with the subject of research is the first grade students with 36students. This research is a classroom action research conducted two cycles. Based on the results of theresearch, it is found that the use of the method of disuksi can improve the students' learning outcomes aboutknowing and determining the length and weight with nonstandard units using concrete objects / concretesituation in the initial data, the total number of completed students is 12 students (33.3%) average 55.83. In thefirst cycle has increased the number of students who complete is 26 students (77.22%) with an average value of80.00. In the second cycle has increased with the total number of students who completed is 32 students (88.89)with an average value of 88.06.

PENERAPAN STRATEGI PEMBELAJARAN INQUIRY DENGAN PENDEKATAN CTL (CONTEXTUAL TEACHING AND LEARNING) UNTUK MENINGKATKAN HASIL BELAJAR MATEMATIKA SISWA KELAS VIII-D SMPN 4 TAMBANG

2018 ◽  
Vol 2 (2) ◽  
pp. 156
Author(s):  
Zulkifli Zulkifli
Keyword(s):  
Learning Outcomes ◽  
Teaching And Learning ◽  
Student Learning Outcomes ◽  
Average Score ◽  
Mathematics Students ◽  
Algebraic Form ◽  
Student Activity ◽  
Average Value ◽  
The Subject ◽  
Improve Student Learning

This research is based on the low learning outcome of mathematics students of grade VIII SMPN 4 Tambang.The purpose of this research is to improve the learning outcomes of mathematics through the application ofinquiry learning with CTL approach. This research was conducted in SMPN 4 Tambang with subject of classVIII-D students with 29 students. This classroom action research was started in early January 2017. Theresearch instrument consists of a teacher and student activity sheet instrument and a test of learning outcomes.Based on the results of research and discussion can be concluded that the strategy of inquiry learning with CTLapproach can improve student learning outcomes of mathematics on the subject matter of algebraic form inclass VIII-D SMPN 4 Tambang. On the basic score the number of students who reached the KKM as many as 14people (48.28%) with an average score of 58.79. In cycle I the number of students who reach the KKM of 19people (65.52%) with an average value of 65.69%. In cycle II the number reaching KKM is 25 people (86.21%).

UPAYA MENINGKATKAN HASIL BELAJAR MATEMATIKA PADA MATERI PECAHAN SEDERHANA MELALUI MEDIA KARTU PECAHAN DI KELAS VI SD NEGERI 011 DESA BARU KECAMATAN SIAK HULU

2019 ◽  
Vol 3 (1) ◽  
pp. 213
Author(s):  
Maimun Maimun
Keyword(s):  
Action Research ◽  
Learning Outcomes ◽  
Mathematics Learning ◽  
Simple Fraction ◽  
Average Value ◽  
The Subject ◽  
Classroom Action Research

The background of this study is the low mathematics learning outcomes of class VI students at SD Negeri 011 Desa Baru, to overcome this problem a classroom action research was conducted by applying fraction card media. This research was conducted in SD Negeri 011 Desa Baru, the subject of this study was class VI students with a total of 24 students. The results of this study show that mathematics learning outcomes have increased in pre-cycle average value obtained is 59.8, in the first cycle obtained an average value of 68.3. And in the second cycle obtained an average value of 82.9. Based on the results of this study, it can be concluded that the mathematics learning outcomes in simple fraction material increase after the fraction card media are applied.

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