scholarly journals A Simulation Study for Single and Double Effect Absorption Solar Cooling Systems Operated Under Taiwan Climate

2011 ◽  
Author(s):  
Ru Yang ◽  
Jun-Long Shen
Keyword(s):  
Flat Plate ◽  
Simulation Study ◽  
System Optimization ◽  
Double Effect ◽  
Cooling Load ◽  
Cooling Systems ◽  
Solar Cooling ◽  
Solar Fraction ◽  
Single Effect ◽  
Linear Concentration

This research numerically studies the performance of absorption solar cooling systems operated under climates of the major cities in Taiwan. Both single-effect and double effect absorption solar cooling systems are studied. The single-effect system uses flat-plate solar collectors and the double-effect system uses linear concentration collectors. The results show a promising solar fraction (the fraction of cooling load provided by solar energy) for most of Taiwan areas. In addition, the double-effect systems provide better solar fraction than the single-effect systems. This study provides design reference and system optimization for the development of absorption solar cooling systems in Taiwan.

scholarly journals A solar air-cooled high efficiency absorption system in dry hot climates: Reduction of water consumption and environmental impact

2018 ◽  
Vol 22 (5) ◽  
pp. 2151-2162
Author(s):  
Jose Marcos ◽  
Raquel Lizarte ◽  
Fernando Varela ◽  
Maria Palacios-Lorenzo ◽  
Ana Blanco-Marigorta
Keyword(s):  
Water Consumption ◽  
High Efficiency ◽  
Cooling System ◽  
Double Effect ◽  
Environmental Benefits ◽  
Absorption System ◽  
Solar Cooling ◽  
Single Effect ◽  
Solar Cooling System

A solar cooling system with an optimized air-cooled double-effect water/LiBr absorption machine is proposed as a sustainable alternative to meet cooling demands in dry hot climates. This system allows eliminating the cooling towers in those regions of the planet where water is scarce. This work analyses the environmental benefits of this air-cooled system, as well as its environmental foot-prints, compared to a solar water-cooled single effect. In this regard, a methodology has been applied to calculate the annual saving in water consumption produced in a case study: a hospital located in Almer?a, in South of Spain. Further-more, the reduction in energy consumption and CO2 emissions is also quantified since this machine can be driven by solar energy and with higher efficiency than those of single effect.

scholarly journals Comparison of the Performance of Single Effect, Half Effect, Double Effect in Series and Inverse Absorption Cooling Systems Operating with the Mixture H2O-LiBr

2014 ◽  
Vol 57 ◽  
pp. 2534-2543 ◽  
Author(s):  
L.A. Domínguez-Inzunza ◽  
M. Sandoval-Reyes ◽  
J.A. Hernández-Magallanes ◽  
W. Rivera
Keyword(s):  
Double Effect ◽  
Cooling Systems ◽  
Absorption Cooling ◽  
In Series ◽  
Single Effect

Economic Evaluation of Solar Cooling Schemes

2017 ◽  
Vol 6 (1) ◽  
pp. 23-48
Author(s):  
Manoj Kumar
Keyword(s):  
Life Cycle ◽  
Economic Evaluation ◽  
Low Temperature ◽  
Cost Effective ◽  
Capital Cost ◽  
Solar Collectors ◽  
Cooling Systems ◽  
Solar Cooling ◽  
Maximum Range ◽  
Single Effect

This paper provides an economic evaluation and comparison of ejector, absorption and vapor compression systems driven either partly or fully by solar energy. Life cycle costing has been used to assess the relative economic ranks of eight solar cooling schemes. It has been shown that the capital cost of solar collectors is the dominant capital cost item in the total inventory of solar cooling plant, which has a strong influence on the system life cycle costs. Lower collector costs are therefore critical in establishing economically viable solar cooling systems. Primary energy analysis has been carried out and the running costs of chillers were determined for the maximum range of thermal and electric solar fractions and a number of annual equivalent full load hours of operation. The results indicate that two low temperature flat-plate collector assisted single-effect absorption chillers compete favorably with a PV assisted centrifugal mechanical compression chiller across the maximum range of thermal and electrical solar fractions. Low temperature options for solar cooling have been shown to be more economical than their high temperature counterparts. At current collector prices, solar cooling systems are still not cost effective compared with conventional centrifugal cooling systems, however, it is shown that at a collector cost of £57/m2 for thermal energy and £1.8/Wp for electrical energy, single-effect solar absorption and PV-centrifugal compression could become cost effective within an annual EFLH of 5840 hours. As such, the paper presents technical guidance on the procurement and operation of solar cooling plant. The novel energy and cost calculation methodology developed here can be applied globally to a wide range of solar collectors, chillers, heat rejection and ancillary subsystems.

Thermal Performance Evaluation of Friction Stir Welded Flat Plate Heat Sink Using CFD Analysis

2015 ◽  
Vol 787 ◽  
pp. 505-509
Author(s):  
A.K. Lakshminarayanan ◽  
M. Suresh
Keyword(s):  
Flat Plate ◽  
Heat Sink ◽  
High Efficiency ◽  
Base Plate ◽  
Software Tool ◽  
Cover Plate ◽  
Air Cooling ◽  
Cooling Systems ◽  
Plate Heat ◽  
Friction Stir

In an era of compact cooling requirements, where air cooling systems seem to be ineffective and consistently, being replaced by liquid cooled systems, with greater watt density heat energy dissipation. Such cooling systems must work with good quality enabling high efficiency. Hence, an attempt is made to fabricate an aluminum alloy based flat plate heat sink with cover and base plate using friction stir welding. The base plate is machined to obtain channels for fluid flow and the cover plate is fitted in the base plate and welded. Two such configurations of these heat sinks were fabricated with varying channel lengths and number of channels. The flow characteristics of the model for these configurations were analyzed numerically using computational fluid dynamics (CFD) software tool, ANSYS fluent 14.

scholarly journals EVAPORATIVE WATER AND AIR COOLERS FOR SOLAR COOLING SYSTEMS. ANALYSIS AND PERSPECTIVES

2017 ◽  
Vol 52 (5) ◽  
Author(s):  
A. Doroshenko ◽  
K. Shestopalov ◽  
I. Mladionov
Keyword(s):  
Systems Analysis ◽  
Ambient Air ◽  
Dew Point ◽  
Cooling Process ◽  
Evaporative Water ◽  
Cooling Systems ◽  
Solar Cooling ◽  
Multistage System ◽  
Process Implementation ◽  
Polymeric Structures

The concept of evaporative coolers of gases and fluids on the basis of monoblock multichannel polymeric structures is presented. Different schemes of indirect evaporative coolers, in which the natural cooling limit is the dew point of the ambient air  are discussed. In such systems the cooling temperature is lower than the wet bulb temperature of the ambient air. Special attention is paid to the recondensation of water vapor for deep evaporative cooling. It is shown that for the solution of the recondensation problem it is necessary to vary the ratio of the contacting air and water flows, particularly in each stage of the multistage system. Recommendations for the deep cooling process implementation in the evaporative coolers of gases and liquids are given.

Assessment criteria for solar cooling systems

1984 ◽  
Vol 7 (5) ◽  
pp. 327-332 ◽  
Author(s):  
S Ayyash ◽  
R.K Suri ◽  
G.P Maheshwari
Keyword(s):  
Assessment Criteria ◽  
Cooling Systems ◽  
Solar Cooling
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