The organic Rankine cycle (ORC) is an effective technology for power generation from temperatures of up to 400 °C and for capacities of up to 10 MW el.The use of solar irradiation for driving an ORC is a promising renewable energy-based technology due to the high compatibility between the operating temperatures of solar thermal collector technologies …
The temperature value attained for the oil leaving the WHR system rested at 189.42 °C, similar to the temperature value of the oil entering the solar collector system. With a rate of 2334.63 kW power in the solar collector, the oil …
3.1 Solar collector subsystem. The LS-2 type parabolic trough collector is applied in this paper. The trough solar collector field model refers to the 30 MW SEGS V1 solar power plant where Therminol VP-1 is selected as the thermal conduction oil. Table 1 shows the trough solar collector field parameters.
Table 9.1 presents the concentration ratio and temperature range of various solar collectors. ... the temperature difference between top and bottom is relatively slight throughout the process. If convection is checked at any horizontal plane, the heat will build up below, creating a temperature difference between top and bottom. This phenomenon ...
The optimum value of the liquid to air flow rate was reported as ≤2.54. Yutong and Yang [24] identified the effects of air and solution conditions on the heat and mass transfer coefficients by ...
The number of collectors connected in series, n c, in each loop, is set equal to 4, which is a common configuration, while their efficiency can be calculated based on the temperature difference of the inlet/outlet HTF from each collector (using Eq. (1)). The total heat provided by the solar collectors (Q HTF) is given by Eq. (6).
Abstract This paper presents the experimental results of thermal analysis of a solar parabolic trough collector receiver. For performance improvement and regulating the temperature distribution convergent divergent receiver tube is used. For performance improvement spiral tape as insert is used inside the convergent divergent receiver tube. …
Unglazed Collector: The low-tech unglazed (pool type) collector has the best efficiency of all the collectors when the temperature difference between collector and ambient is small. This is because it has no …
Thermodynamic investigation of a novel hydrogen liquefaction process using thermo-electrochemical water splitting cycle and solar collectors. Author links open overlay panel Armin Ebrahimi a ... 1.4, 1.2, 1.7, and 2.3 K, respectively. Also, their logarithmic mean temperature difference (LMTD) are 6.3, 11.8, 6.9, 4.6, 4.3, 3.3, and 4.8 K ...
The operating temperature of the Brayton cycle is the inlet temperature of high pressure (HP) turbine, illustrated as state 5b-A in Fig. 1 which is slightly less than the temperature at which S-CO 2 leaves the solar collector array, but significantly higher than the temperature at which S-CO 2 enters the solar collector array.
For the single-element array there is a slight under-prediction of the solar collector temperature compared to the higher resolution arrays. The average difference in collector temperature between the single-element and the 9-element model is 2.7 °C. This is equal to 2.6% of the amplitude of the daily collector temperature variation, which is ...
The rate of exergy destruction is due to the temperature difference between the absorber and the Sun, the absorber and the evaporator of a heat pipe (solar collector) and the …
This paper focuses on suitable solar–thermal collectors for use in a combined heat and power system targeted at the UK market, based on an organic Rankine cycle. Concentrating and non-concentrating collector …
The Sun represents the main source of energy for the Earth [].Without the Sun, the temperature on the planet would be in the vicinity of 0 K like in the rest of the interstellar space, making life on Earth impossible [].The diameter of the Sun is 1.39·10 9 m ≈ 1.4·10 6 km and it is situated at about 1.5·10 11 m = 150·10 6 km from Earth [].
DVG and HTF configurations of the solar cycle were analyzed in detail with parabolic trough collectors and toluene, hexamethyldisiloxane and octamethylciclotetrasiloxane as working fluids of the ORC [7], [8].That analysis was channelled to the optimization of the operating conditions of the solar cycle and it showed that solar regenerative overall organic …
The results revealed that reductions in flow rate and elevations in volume fraction led to increased outlet temperature of solar collector, inlet and outlet temperature difference in collector, tank and radiator, and improved solar collector efficiency. ... It was conducted as a laboratory cycle which a volume flow rate which grew from 20 L to ...
In the components of the organic Rankine cycle, increasing the pinch-point temperature difference and consequently increasing the temperature of the solar propulsion …
Recently, solar energy research popularity has been growing rapidly due to its pollutant-free renewable energy source. As an alternative energy to the existing conventional fossil resources, solar energy is projected to drive the future research to a new level in renewable energy field. One of the methods to harvest the solar energy is through the solar thermal …
Among the most important renewable energy sources, solar energy is the most important type as it can be exploited thermally by adopting various solar collectors, especially solar concentrators.
However, the best exergy performance (0.5239) was obtained when the cooling temperature was −10 °C instead of 0 °C because this condition represents a greater temperature difference for the high- and low-temperature thermal sources of the cooling system, which favors its second-law performance.
When the solar thermal collector is operated at 0.0188 kg/s and 0.1% weight concentration of GAMWCNT nanofluid, the highest size reduction, 27.59%, is achieved as compared to a flat plate solar ...
Current research in solar thermal power primarily focuses on the utilization of concentrating solar collectors, such as parabolic trough solar collectors [9], and solar tower solar collectors [10].These collectors have the advantage of serving as a higher temperature source, thus increasing the efficiency of the subsequent thermodynamic cycle (such as the …
Logarithmic Mean Temperature Difference. LTH. Low Temperature Heat Exchanger. LCOE. ... Multi-objective optimization and energy/exergy analysis of a ternary nanofluid based parabolic trough solar collector integrated with kalina cycle. Sol Energy Mater Sol Cells, 231 (2021), 10.1016/j.solmat.2021.111322.
As a result, the temperature of the solar collector increases. If a fluid is passed through the collector, part of this heat is transferred to the liquid in accordance with the first and second laws of thermodynamics. The rest of the energy is still lost in the form of radiation from the solar thermal collector to the outside environment.
The solar collector model validation compared the model developed to Ref. [32]. The analysis indicated a less than 2% difference in the outlet solar collector temperature operating at the steady-state design condition.
This assumption is made to ensure that the temperature difference between solar-collector fluid and ORC working fluid is not less than the minimum pinch difference at any point along the length of the heat exchanger [26] and the temperature difference between these two streams is always higher than pinch difference [31].
Solar collectors and thermal energy storage components are the two kernel subsystems in solar thermal applications. Solar collectors need to have good optical performance (absorbing as much heat as possible) [3], whilst the thermal storage subsystems require high thermal storage density (small volume and low construction cost), excellent heat …
A Review on Solar Collector and Solar Organic Rankine Cycle (ORC) Systems . Kyoung Hoon Kim1 and Chul Ho Han2. Kumoh National Institute of Technology/Department of Mechanical Engineering1 and Department of Intelligent Mechanical Engineering2, Gumi, Gyeongbuk 730-701, Korea . Email: {khkim, chhan}@kumoh.ac.kr
The results are presented in bins of 20 K, corresponding to the specified temperature differences between the collector mean temperature and the ambient temperature. Each bin shows the mean value of all GTY simulations (dot) of the products in this category at the corresponding temperature difference, as well as the variance of the …
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