Closed-Type Solar Regenerator: Analysis and Simulation

1995 ◽  
Vol 117 (1) ◽  
pp. 58-61 ◽  
Author(s):  
P. Gandhidasan
Keyword(s):  
Thin Film ◽  
Thermal Performance ◽  
Operating Parameters ◽  
Regeneration System ◽  
Glass Cover ◽  
Tilted Surface ◽  
Closed Type ◽  
Flow Length ◽  
Potential Problems ◽  
Rate Of Evaporation

Due to many potential problems associated with an open regeneration system in application to reconcentration with liquid desiccants, a closed-type solar regenerator has been simulated and analyzed in this paper. It consists of a flat, blackened, tilted surface with a transparent glazing as a covering. The weak desiccant to be concentrated flows as a thin film over the absorber and the water evaporating from the desiccant due to absorption of solar energy is condensed on the underside of the glass cover. A theoretical model, which includes the variation of rate of evaporation of water along the flow length of the regenerator, has been used to examine the thermal performance of the regenerator. Changes in thermal performance are reported in terms of insolation and the mass of water evaporated from the desiccant for different operating parameters.

Thermal Performance Analysis of a Partly Closed-Open Solar Regenerator

1995 ◽  
Vol 117 (2) ◽  
pp. 151-153 ◽  
Author(s):  
P. Gandhidasan ◽  
A. A. Al-Farayedhi
Keyword(s):  
Performance Analysis ◽  
Surface Area ◽  
Thermal Performance ◽  
Operating Parameters ◽  
Open Surface ◽  
Regeneration System ◽  
Liquid Desiccant ◽  
Regeneration Efficiency

This paper presents a modified open regeneration system suitable for humid climates. The upper part of the open regenerator is covered with a single glazing where the desiccant can be heated up without evaporation of water and the evaporation starts at the beginning of the open surface. For this type of regenerator, performance analysis has been made to predict the mass of water evaporated from the weak liquid desiccant to the atmosphere. The regeneration efficiency is obtained for various ratios of glaze surface area to the open surface area for different operating parameters.

Thermal Performance Analysis of a Rectangular Longitudinal Finned Solar Air Heater With Semicircular Absorber Plate

2015 ◽  
Vol 138 (1) ◽  
Author(s):  
Satyender Singh ◽  
Prashant Dhiman
Keyword(s):  
Thermal Performance ◽  
Numerical Solutions ◽  
Solar Air Heater ◽  
Duct Flow ◽  
Balance Equations ◽  
Absorber Plate ◽  
Ansys Fluent ◽  
Air Heater ◽  
Glass Cover ◽  
Good Agreement

Thermal performance of a single-pass single-glass cover solar air heater consisting of semicircular absorber plate finned with rectangular longitudinal fins is investigated. The analysis is carried out for different hydraulic diameters, which were obtained by varying the diameter of the duct from 0.3–0.5 m. One to five numbers of fins are considered. Reynolds number ranges from 1600–4300. Analytical solutions for energy balance equations of different elements and duct flow of the solar air heater are presented; results are compared with finite-volume methodology based numerical solutions obtained from ansys fluent commercial software, and a fairly good agreement is achieved. Moreover, analysis is extended to check the effect of double-glass cover and the recycle of the exiting air. Results revealed that the use of double-glass cover and recycle operation improves the thermal performance of solar air heater.

Thermal performance of thin film heat gauges of gold, silver and nano-composite

2019 ◽  
Vol 147 ◽  
pp. 545-550 ◽  
Author(s):  
Shrutidhara Sarma ◽  
Ankit Goyal ◽  
Liang Gao ◽  
Xiaodong Niu ◽  
Akhil Garg ◽  
...  
Keyword(s):  
Thin Film ◽  
Thermal Performance ◽  
Nano Composite ◽  
Gold Silver

scholarly journals Operating parameters affecting the thermal performance of biomass boilers

TAPPI Journal ◽  
2017 ◽  
Vol 16 (08) ◽  
pp. 453-461
Author(s):  
Naz Orang ◽  
Honghi Tran ◽  
Andy Jones ◽  
F. Donald Jones
Keyword(s):  
Moisture Content ◽  
Thermal Performance ◽  
Excess Oxygen ◽  
Operating Parameters ◽  
Pulp Mills ◽  
Furnace Temperature ◽  
Bubbling Fluidized Bed ◽  
Oil Flow ◽  
Induced Draft Fan ◽  
Content Range

Operating data of a bubbling fluidized bed (BFB) boiler and three stoker grate (SG) biomass boilers from different pulp mills were analyzed over a 2-year period. The results show that in all cases, the thermal performance decreases markedly from 5.5 to 4 lb steam/lb dry biomass as the feedstock moisture content increases from 40% to 60%. The BFB boiler had better thermal performance, although it operated in a higher moisture content range compared with the SG boilers. Multivariate analysis was also performed on one of the SG boilers to determine operating parameters that affect thermal performance. The results show that furnace temperature, oil flow rate, and induced draft fan current positively correlate with thermal performance, while the feedstock moisture content, total air flow, and excess oxygen (O2) negatively correlate with thermal performance. This implies that when making modifications to improve thermal performance, it is important to take into account correlations among various parameters. In some cases, one positively correlated parameter might cause an increase in a negatively correlated parameter. The net effect might be a decrease in thermal performance.

Thermal Performance and Stability of Poly Si/Pt(Ni) Thin Film Temperature Sensors on GaAs

2001 ◽  
pp. 1468-1471 ◽  
Author(s):  
Tibor Lalinský ◽  
Pavol Hrkút ◽  
Ž. Mozolová ◽  
Tomáš Kovačik ◽  
Andrej Krajcer
Keyword(s):  
Thin Film ◽  
Thermal Performance ◽  
Temperature Sensors

An Experimental Study on the Thermal Performance Evaluation of SCW Ground Heat Exchanger

2017 ◽  
Vol 25 (01) ◽  
pp. 1750006 ◽  
Author(s):  
Keun Sun Chang ◽  
Min Jun Kim ◽  
Young Jae Kim
Keyword(s):  
Thermal Conductivity ◽  
Performance Evaluation ◽  
Heat Exchanger ◽  
Effective Thermal Conductivity ◽  
Thermal Performance ◽  
Thermal Response ◽  
High Heat ◽  
Injection Rate ◽  
Operating Parameters ◽  
Ground Heat Exchanger

In recent years, application of the standing column well (SCW) ground heat exchanger (GHX) has been noticeably increased as a heat transfer mechanism of ground source heat pump (GSHP) systems with its high heat capacity and efficiency. Determination of the ground thermal properties is an important task for sizing and estimating cost of the GHX. In this study, an in situ thermal response test (TRT) is applied to the thermal performance evaluation of SCW. Two SCWs with different design configurations are installed in sequence to evaluate their effects on the thermal performance of SCW using a single borehole. A line source method is used to derive the effective thermal conductivity and borehole thermal resistance. Effects of operating parameters are also investigated including bleed, heat injection rate, flow rate and filler height. Results show that the effective thermal conductivity of top drawn SCW (Type A) is 11.7% higher than that of bottom drawn SCW (Type B) and of operating parameters tested bleed is the most significant one for the improvement of the thermal performance (40.4% enhanced in thermal conductivity with 10.9% bleed).

Studies on Thermal Performance of Closed Type Parabolic Trough Solar Collector

2011 ◽  
Vol 347-353 ◽  
pp. 812-821
Author(s):  
Zhong Zhu Qiu ◽  
Peng Li ◽  
Shao Lin Gong ◽  
Ye Wang ◽  
Wen Wen Guo ◽  
...  
Keyword(s):  
Thermal Performance ◽  
Solar Collector ◽  
Model Simulation ◽  
Test Bed ◽  
Parabolic Trough ◽  
Simulation Accuracy ◽  
Closed Type ◽  
Efficiency Test ◽  
Set Up ◽  
Parabolic Trough Solar Collector

To a closed type parabolic trough solar collector, thermal performance was analyzed, a mathematical model was set up, and test-bed of collector to heat efficiency test was built. According to the experiment test data, the accuracy of the thermal mathematics model was validated. The results show that the model simulation accuracy is so higher that the model is reasonable and available.

On the Use of Longitudinal Fins to Enhance the Performance in Rectangular Duct of Solar Air Heaters—A Review

2019 ◽  
Vol 141 (3) ◽  
Author(s):  
Mukesh Kumar Sahu ◽  
Manoj Sharma ◽  
M. M. Matheswaran ◽  
Kinshuk Maitra
Keyword(s):  
Heat Transfer ◽  
Present Article ◽  
Thermal Performance ◽  
Bottom Plate ◽  
Operating Parameters ◽  
Solar Air Heater ◽  
Rectangular Duct ◽  
Detailed Review ◽  
Extended Surface ◽  
Different Shapes

The objective of the present article is to present a detailed review of the research carried out on the use of extended surface in the form of longitudinal fins, with its different shapes, geometries, and attachments on solar air heater (SAH), to improve the thermal performance of conventional SAH duct. The use of extended surface in the scheme of fins placed longitudinally along the air-flow path on the absorber or bottom plate surfaces is an effective method to augment the performance of SAH duct. Various studies have been carried out through employing longitudinal fins for the enhancement in thermal performance of simple SAH duct. Finally, all the details of the literature as a summary, i.e., about fin geometries, systems, and operating parameters for analysis, are compiled together and well tabulated. The investigators used correlations for heat transfer, and friction factor also has been classified and presented in a relevant form in the present article. Finally, an attempt has been made to compare the performances of different finned SAHs by using correlations.

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