Experimental Diagnosis of the Heat Pipe Solar Collector Malfunction. A Case Study

Znaczko, Pawel; Szczepański, Emilian; Kaminski, Kazimierz; Chamier-Gliszczyński, N.; Kukulski, Jacek

doi:10.3390/en14113050

Cited by 5 publications

(3 citation statements)

References 40 publications

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“…The experimental investigations were carried out on a test stand for solar collectors located at the University of Koszalin [34]. The stand was constructed to measure the thermal efficiency of the solar thermal system [35]. The research was conducted between May 2019 and September 2020.…”

Section: Methodsmentioning

confidence: 99%

Experimental Analysis of Control Methods in Solar Water Heating Systems

et al. 2021

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This paper focuses on an analysis of selected control methods in solar heating systems. Proportional, ON-OFF, and new proposed IPC control methods were tested. Experimental tests were conducted under natural conditions using the author’s method of clustering measurement days. In the form of thermal energy gains in the storage tanks, the results for all tested control methods are presented. The ON-OFF control method is suitable for low variability of solar radiation conditions but is ineffective under dynamic solar radiation conditions. The proportional controllers collect thermal energy under high variability solar radiation effectively, but they tend to cause thermal drifts from the system under high heat load. The proposed IPC control method prevents the waste of heat energy and makes more efficient use of the high and dynamic solar radiation. In conclusion, energy gains depend more on the level of solar radiation and less on its variability. However, the variability of solar radiation makes control in solar systems more challenging, and it is one of the factors that should determine the control strategy. The novelty of this work is based on an extension of the control algorithm by adding the temperature at the entry and exit of the solar coil. This makes it possible to eliminate thermal drift and observe the intensity of heat transfer to the water in the tank.

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Section: Methodsmentioning

confidence: 99%

Experimental Analysis of Control Methods in Solar Water Heating Systems

et al. 2021

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“…Such findings are very effective in optimizing consumed power by HVAC systems [18]. Znaczko et al, investigated malfunctions in heat pipe-based solar collectors and discovered the dependency of proper functioning of the heat pipe on geometrical fabrication and the amount of working fluid [19]. In a similar study, Kuczynski et al, investigated the connection between the geometrical aspects and efficiency of flat plate collectors and found that numerical models are very effective in building such correlations [20].…”

Section: Recent Studies On Solar Industrial Process Heatmentioning

confidence: 99%

Integration of Solar Process Heat in Industries: A Review

et al. 2022

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Industrial manufacturing approaches are associated with processing materials that consume a significant amount of thermal energy, termed as industrial process heat. Industrial sectors consume a substantial amount of energy for process heating over a wide range of temperatures (up to 400 °C) from agriculture, HVAC to power plants. However, the intensive industrial application of fossil fuels causes unfavorable environmental effects that cannot be ignored. To address this issue, green energy sources have manifested their potential as economical and pollution-free energy sources. Nevertheless, the adoption of solar industrial process heating systems is still limited due to a lack of knowledge in the design/installation aspects, reluctance to experience the technical/infrastructural changes, low price of fossil fuels, and lack of relative incentives. For successful solar process heat integration in industries, a proper understanding of the associated design factors is essential. This paper comprehensively reviews the integration strategies of solar industrial process heating systems, appraisal of the integration points, different aspects of solar collectors, installed thermal power, and thermal storage volume covering case studies, reports and reviews. The integration aspects of solar process heat, findings, and obstacles of several projects from the literature are also highlighted. Finally, the integration locations of SHIP systems are compared for different industrial sectors to find out the most used integration point for a certain sector and operation. It was found that for the food, beverage, and agriculture sector, 51% of solar process heat integration occurs at the supply level and 27.3% at the process-level.

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“…Solar energy is a promising renewable energy source that can be used for facing critical problems like the increasing energy needs [1], fossil fuel depletion [2] and the decarbonization of our society [3]. There are various solar collectors like typical flat plate collectors [4], improved flat plate collectors [5], heat pipe solar collectors [6] and solar passive systems in buildings [7]. Solar concentrating technology is an interesting idea for producing thermal energy at high-temperature levels and so to feed various energy systems with high exergy rates [8].…”

Section: Introductionmentioning

confidence: 99%

Investigation of a Novel CO2 Transcritical Organic Rankine Cycle Driven by Parabolic Trough Solar Collectors

Bellos

Tzivanidis

2021

ASI

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The objective of the present study is the detailed investigation and optimization of a transcritical organic Rankine cycle operating with CO2. The novelty of the present system is that the CO2 is warmed up inside a solar parabolic trough collector and there is not a secondary circuit between the solar collector and the CO2. Therefore, the examined configuration presents increased performance due to the higher operating temperatures of the working fluid in the turbine inlet. The system is studied parametrically and it is optimized by investigating different pressure and temperature level in the turbine inlet. The simulation is performed with a validated mathematical model that has been developed in Engineering Equation Solver software. According to the results, the optimum turbine inlet temperature is ranged from 713 up to 847 K, while the higher pressure in the turbine inlet enhances electricity production. In the default scenario (turbine inlet at 800 K and turbine pressure at 200 bar), the system efficiency is found 24.27% with solar irradiation at 800 W/m2. A dynamic investigation of the system for Athens (Greece) climate proved that the yearly efficiency of the unit is 19.80%, the simple payback period of the investment is 7.88 years, and the yearly CO2 emissions avoidance is 48.7 tones.

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Experimental Diagnosis of the Heat Pipe Solar Collector Malfunction. A Case Study

Cited by 5 publications

References 40 publications

Experimental Analysis of Control Methods in Solar Water Heating Systems

Experimental Analysis of Control Methods in Solar Water Heating Systems

Integration of Solar Process Heat in Industries: A Review

Investigation of a Novel CO2 Transcritical Organic Rankine Cycle Driven by Parabolic Trough Solar Collectors

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