scholarly journals Economic Feasibility of Flat Plate vs Evacuated Tube Solar Collectors in a Combisystem

2016 ◽  
Vol 91 ◽  
pp. 477-485 ◽  
Author(s):  
Mario Nájera-Trejo ◽  
Ignacio R. Martin-Domínguez ◽  
Jorge A. Escobedo-Bretado
Keyword(s):  
Flat Plate ◽  
Economic Feasibility ◽  
Solar Collectors ◽  
Evacuated Tube

Experimental Daily Energy Performance of Flat Plate and Evacuated Tube Solar Collectors

2009 ◽  
Author(s):  
Enrico Zambolin ◽  
Davide Del Col ◽  
Andrea Padovan
Keyword(s):  
Solar Energy ◽  
Flat Plate ◽  
Energy Performance ◽  
Hot Water ◽  
Solar Collectors ◽  
Input Output ◽  
Evacuated Tube Collector ◽  
Daily Energy ◽  
Radiation Test ◽  
Evacuated Tube

New comparative tests on different types of solar collectors are presented in this paper. Tests have been performed at the solar energy conversion laboratory of the University of Padova. Two standard glazed flat plate collectors and one evacuated tube collector are installed in parallel; the evacuated collector is a direct flow through type with external CPC (compound parabolic concentrator) reflectors. The present test rig allows to make measurements on the flat plate, on the evacuated collector or on both simultaneously, by simply acting on the valves to modify the circuit. In this paper measurements of the performance of the evacuated tube collector and flat plate collectors working at the same conditions are reported. Efficiency in stationary conditions is measured following the standard EN 12975-2 [1] and it is compared with the input/output curves measured for an entire day. The main purpose of the present work is to characterize and to compare the daily energy performance of the two types of collectors. An effective mean for describing and analyzing the daily performance is the so called input/output diagram, in which the collected solar energy is plotted against the daily incident solar radiation. Test runs have been performed in several conditions to reproduce different conventional uses (hot water, space heating, solar cooling).

scholarly journals Economic-environmental comparison between flat-plate and evacuated tube solar collectors

2014 ◽  
Vol 16 (6) ◽  
pp. 1100-1110 ◽  
Keyword(s):  
Environmental Impact ◽  
Flat Plate ◽  
Economic Resources ◽  
Solar Collectors ◽  
Major Category ◽  
Specific Kind ◽  
Iso 14040 ◽  
Cadmium Ions ◽  
The Cost ◽  
Evacuated Tube

<div> <p>This work employs the environmental methodology of Life Cycle Assessment (LCA) in compliance with ISO 14040 and uses software SimaPro&reg; 7.3.2 to compare the environmental impact in process production of flat plate and evacuated tube solar collectors. In addition, an economic analysis was performed based on the acquisition budgets and the operation of such types of collectors. The results show that the manufacturing of flat plate solar collectors has larger environmental impact, and carcinogen is the major category which causes environmental impact in both types of collector as a result of the consumption and emission of arsenic and cadmium ions. Economically, the cost of acquisition of evacuated tube solar collectors is 104.04%. Therefore, the choice for a specific kind of collector depends on the desired advantages, and a complement is required for decision-making based on the availability of economic resources.</p> </div> <p>&nbsp;</p>

Thermal performance enhancement of flat-plate and evacuated tube solar collectors using nanofluid: A review

2016 ◽  
Vol 76 ◽  
pp. 6-15 ◽  
Author(s):  
Mahmud Jamil Muhammad ◽  
Isa Adamu Muhammad ◽  
Nor Azwadi Che Sidik ◽  
Muhammad Noor Afiq Witri Muhammad Yazid
Keyword(s):  
Flat Plate ◽  
Thermal Performance ◽  
Performance Enhancement ◽  
Solar Collectors ◽  
Evacuated Tube

Parametric Study of a Flat Plate Wick Assisted Heat Pipe Solar Collector

2013 ◽  
Vol 135 (3) ◽  
Author(s):  
Brahim Taoufik ◽  
Mhiri Foued ◽  
Jemni Abdelmajid
Keyword(s):  
Flat Plate ◽  
Heat Pipe ◽  
Solar Collector ◽  
Solar Collectors ◽  
Absorber Plate ◽  
Steady State Condition ◽  
Collector Efficiency ◽  
Evacuated Tube Collectors ◽  
Gap Spacing ◽  
Evacuated Tube

The use of heat pipes in solar collectors offers several advantages regarding flexibility in operation and application, as they are very efficient in transporting heat even under a small temperature difference. Compared with other systems powered by evacuated tube collectors or flat plate solar collectors using a wickless heat pipe, little attention has been paid to a flat plate solar collectors wick assisted heat pipe. In this paper an analytical model based on energy balance equations assuming a steady state condition was developed to evaluate the thermal efficiency of a flat plate wick assisted heat pipe solar collector. Parameters which affect the collector efficiency are identified, such as tube spacing distance, gap spacing between the absorber plate and the glazing cover, and the emissivity of the absorber plate. The results reflect the contribution and significance of each of these parameters to the collector overall heat loss coefficients. Three heat pipe working fluids are examined and results show that acetone performs better than methanol and ethanol.

scholarly journals A dynamic model of an innovative high-temperature solar heating and cooling system

2016 ◽  
Vol 20 (4) ◽  
pp. 1121-1133 ◽  
Author(s):  
Annamaria Buonomano ◽  
Francesco Calise ◽  
Maria Vicidomini
Keyword(s):  
High Temperature ◽  
Simulation Model ◽  
Flat Plate ◽  
Cooling System ◽  
Energy Performance ◽  
Economic Feasibility ◽  
Solar Heating ◽  
Hot Water ◽  
Solar Collectors ◽  
Heating And Cooling

In this paper a new simulation model of a novel solar heating and cooling system based on innovative high temperature flat plate evacuated solar thermal collector is presented. The system configuration includes: flat-plate evacuated solar collectors, a double-stage LiBr-H2O absorption chiller, gas-fired auxiliary heater, a closed loop cooling tower, pumps, heat exchangers, storage tanks, valves, mixers and controllers. The novelty of this study lies in the utilization of flat-plate stationary solar collectors, manufactured by TVP Solar, rather than concentrating ones (typically adopted for driving double-stage absorption chillers). Such devices show ultra-high thermal efficiencies, even at very high (about 200?C) operating temperatures, thanks to the high vacuum insulation. Aim of the paper is to analyse the energy and economic feasibility of such novel technology, by including it in a prototypal solar heating and cooling system. For this purpose, the solar heating and cooling system design and performance were analysed by means of a purposely developed dynamic simulation model, implemented in TRNSYS. A suitable case study is also presented. Here, the simulated plant is conceived for the space heating and cooling and the domestic hot water production of a small building, whose energy needs are fulfilled through a real installation (settled also for experimental purposes) built up close to Naples (South Italy). Simulation results show that the investigated system is able to reach high thermal efficiencies and very good energy performance. Finally, the economic analysis shows results comparable to those achieved through similar renewable energy systems.

scholarly journals Residential Solar Thermal Performance Considering Self-Shading Incidence between Tubes in Evacuated Tube and Flat Plate Collectors

2021 ◽  
Vol 13 (24) ◽  
pp. 13870
Author(s):  
Esteban Zalamea-Leon ◽  
Edgar A. Barragán-Escandón ◽  
John Calle-Sigüencia ◽  
Mateo Astudillo-Flores ◽  
Diego Juela-Quintuña
Keyword(s):  
High Altitude ◽  
Flat Plate ◽  
Energy Requirement ◽  
Solar Thermal ◽  
Complete Analysis ◽  
Solar Collectors ◽  
Climate Conditions ◽  
Real Performance ◽  
Evacuated Tube Collectors ◽  
Evacuated Tube

The performance of solar thermal technology under high-altitude equatorial climatic and solar path conditions has not been determined. Evacuated tube solar collectors are more efficient than flat plate collectors in cold and cloudy regions; however, due to their dependence on orientation, the irradiation incidence between the tubes of these collectors can be blocked. In this study, the performance of these types of collectors was analyzed to determine the implications of their orientation under these specific climate conditions. Four solar thermal systems were installed: two of the systems used evacuated tube collectors, and two used flat plate collectors. Each collector was connected to storage and discharge points to simulate residential consumption when observing the real performance of the four systems in terms of irradiation availability. The evacuated tube collectors were more efficient and reduced the backup energy requirement by up to 20.6% more on average than the flat plate collectors. In addition, the performance of the evacuated tube collectors increased by up to 9.8% when the tubes were arranged parallel to the solar path, compared to when they were arranged perpendicular to the solar path, verifying that the blockage effect is an important parameter to consider for evacuated tube technology. The main novelty of this research is the comparison of these two technologies under different orientations, with perpendicular and parallel dispositions toward the solar path, in a high-altitude equatorial location where solar collectors are not typically oriented in any particular orientation. To the best of our knowledge, this is the first complete analysis of real systems deployed under these conditions.

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