Design, Construction, and Analysis of a Passive Indirect Solar Dryer With Chimney

2018 ◽  
Vol 141 (3) ◽  
Author(s):  
Felipe Cichetto Tedesco ◽  
Alexandre José Bühler ◽  
Sérgio Wortmann
Keyword(s):  
Solar Collector ◽  
Low Cost ◽  
Payback Period ◽  
Coefficient Of Performance ◽  
Rio Grande Do Sul ◽  
Alternative Technologies ◽  
Solar Dryer ◽  
Great Production ◽  
Design Construction ◽  
Seeds And Fruits

The growing demand for alternative technologies, of clean and sustainable nature, has fostered the development and improvement of equipment that uses solar energy for the dehydration of seeds and fruits. Such equipment has been used worldwide for hundreds of years; however, it remains uncommon in Serra Gaúcha, a region of great production of grapes and apples for natura consumption in the state of Rio Grande do Sul—Brazil. In order to investigate the economic and technical viability of solar dryers in the Serra Gaúcha, this work has as target the design, simulation, construction, and experimental analysis of an Indirect Passive Solar Dryer with Chimney. The prototype, divided into three parts: solar collector, dehydration chamber, and chimney, was built prioritizing materials of low cost, but that did not compromise its performance. The device was submitted to experiments, which observed: solar collector behavior very close to the simulated one; obtaining a coefficient of performance of 87% in the equipment; satisfactory rise in temperature at the collector outlet comparing to its inlet; and dehydration of apples with a reduction of 89% in mass with 32.78 MJ of energy delivered to the system. The prototype payback period was estimated in two years.

Design, Construction and CFD Modeling of a Banana-Solar Dryer With Double Pass Solar Air Collector

2020 ◽  
Author(s):  
Philemon Mutabilwa ◽  
Kevin N. Nwaigwe
Keyword(s):  
Solar Collector ◽  
Cfd Modeling ◽  
Outlet Temperature ◽  
Cfd Model ◽  
Double Pass ◽  
Solar Dryer ◽  
Solar Air Collector ◽  
Aluminum Pipe ◽  
Drying Chamber ◽  
Design Construction

Abstract A work on the design, construction and computational fluid dynamics modelling of a solar dryer with a double pass solar air collector is presented. Using fundamental relationships, an indirect solar dying system for drying banana was designed and constructed. The system consists of a drying chamber and a double pass solar collector (DPSC), connected together with a flexible aluminum pipe. The system features a unique arrangement, as the drying chamber is underneath the double pass solar collector, and the solar collector itself can be adjusted to an angle of 0° up to 35° the maintenance or research purpose. The DPSC has five longitudinal fins, lying parallel with air flow. The solar dryer is incorporated with a convective DC fan that sucks hot air from the solar collector on to the drying chamber. The DPSC achieved an optimal peak outlet temperature of 345K with a maximum operational efficiency of 72.5%. A computational fluid dynamic (CFD) model is achieved for prediction of the dryer temperature and 3D airflow distribution within the dryer unit using ANSYS 18.2. The CFD model was validated using experimental data. The developed dryer demonstrated improved efficiency over similar dryers, and this is attributable to the unique arrangement of component parts.

An Experimental Investigation of a Stationary Reflector/Tracking Absorber Solar Collector at Intermediate Temperatures

1982 ◽  
Vol 104 (4) ◽  
pp. 340-344 ◽  
Author(s):  
E. Fruchter ◽  
G. Grossman ◽  
F. Kreith
Keyword(s):  
Low Temperatures ◽  
Solar Collector ◽  
Low Cost ◽  
Mineral Oil ◽  
Heat Transfer Fluid ◽  
Spherical Mirror ◽  
Present System ◽  
Intermediate Temperature Range ◽  
Design Construction ◽  
Stationary Reflector

This paper describes the design, construction, and testing of a concentrating solar collector based on the Stationary Reflector/Tracking Absorber (SRTA) principle. The system consists of a fixed, 2.5-m dia, spherical mirror which focuses solar radiation on a movable, cylindrical absorber tracking the sun. This work is an extension of earlier tests with a similar collector in which output temperatures up to 150°C were obtained with water. The present system, using a mineral-oil-based heat transfer fluid, was capable of heating the fluid up to 300°C under steady-state conditions. The direct radiation efficiency ranged from 50 percent at low temperatures up to 30 percent near 300°C, showing the SRTA to be an effective concentrating collector for the intermediate temperature range which can be constructed at relatively low cost.

scholarly journals Development of a Multipurpose Solar Dryer

2016 ◽  
Vol 1 (1) ◽  
Author(s):  
Dare Aderibigbe Adetan ◽  
Kolawole Adesola Oladejo ◽  
Surajudeen Obayopo
Keyword(s):  
Solar Collector ◽  
Cost Effective ◽  
Food Preservation ◽  
Experimental Conditions ◽  
Solar Dryer ◽  
Energy Saving Technology ◽  
And Performance ◽  
Design Cost ◽  
Drying Chamber ◽  
Design Construction

In many parts of the world there is a growing awareness that renewable energy has an important role to play in extending technology to the farmers in developing countries to increase their productivity. Solar thermal technology is rapidly gaining acceptance as an energy saving technology in agriculture application. This article presents the design, construction and performance evaluation of a solar dryer for food preservation. In the dryer, heated air from a separate solar collector is passed through beds of grains. The design of the dryer makes provision for the attachment of additional mirrors on two opposite sides of the solar collection chamber. Overall, the dryer is of simple design, cost effective, and made from affordable available materials and require little or no skills for its fabrication and operation. The results obtained fromtests carried out on the dryer revealed that the temperatures inside the drying chamber and the solar collector were highest when the side mirrors were at 45o to the vertical, giving optimum performance under various experimental conditions.

scholarly journals Design and Construction of Indirect Solar Coffee Dryer

2020 ◽  
Vol 9 (4) ◽  
pp. 2943-2956
Keyword(s):  
Solar Collector ◽  
Air Inlet ◽  
Solar Dryer ◽  
Sunshine Hours ◽  
Inlet Hole ◽  
Outlet Hole ◽  
Collector Efficiency ◽  
And Performance ◽  
Drying Chamber ◽  
Design Construction

Drying is the process of removing moisture contents from solid. Solar drying refers to a technique that utilizes incident solar radiation to convert it into thermal energy required for drying purposes. This project presents the design, construction and performance of an indirect type solar dryer for coffee product. In the dryer the air inters into the solar collector from the atmosphere through air inlet hole. This air will be heated in the collector and then pass to the drying chamber through the hole. Then the air exhausts through the outlet hole at the top of the drying chamber. The system designed can handle a capacity of up to 50kg of wet coffee per m2 at a depth of 100 mm. The average sunshine at Bale Robe was found to be 12 hours per day. The daily solar insolation at the site was found to be 5.86kW/m2 of surface per day. By utilizing the solar collector in question and assuming a collector efficiency of 20 %, the total solar energy received is 5.86 kW-hrs/m2 /day or 46.88 kW-hours per day (assuming the sunshine hours per day to be 8 hours). This solar dryer has a collector efficiency of 39.1%, a pick-up efficiency of 49.3%, and a system efficiency of 32.2%. the collector area of the system is calculated to be 1.11m2 and the total length of 1000mm by 300mm. The drying chamber is essentially a cabinetry dryer and measures 1020mm × 800mm × 30mm. It accommodates a drying bin which acts as the holding compartment for the wet coffee to be dried. The base of the drying chamber is made of a block of wood material 50mm deep, since wood is a good thermal insulator. The wood must be well seasoned and pre-treated to ensure it is protected from the humid environment. The air outlet is fitted at the top of the drying chamber which serves as the exit for the moisture ridden air. It is important since it ensures that moisture does not condense at the top of the drying chamber and speeds up the rate of drying through creating the suction effect. The drying bin measures 800mm × 800mm × 20mm.

scholarly journals Dynamic and Economic Investigation of a Solar Thermal-Driven Two-Bed Adsorption Chiller under Perth Climatic Conditions

Energies ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 1005 ◽  
Author(s):  
Ali Alahmer ◽  
Xiaolin Wang ◽  
K. C. Amanul Alam
Keyword(s):  
Fourier Series ◽  
Solar Radiation ◽  
Solar Collector ◽  
Payback Period ◽  
Climatic Conditions ◽  
Solar Thermal ◽  
Coefficient Of Performance ◽  
Solar Thermal Energy ◽  
Adsorption Refrigeration ◽  
Adsorption Chiller

Performance assessment of a two-bed silica gel-water adsorption refrigeration system driven by solar thermal energy is carried out under a climatic condition typical of Perth, Australia. A Fourier series is used to simulate solar radiation based on the actual data obtained from Meteonorm software, version 7.0 for Perth, Australia. Two economic methodologies, Payback Period and Life-Cycle Saving are used to evaluate the system economics and optimize the need for solar collector areas. The analysis showed that the order of Fourier series did not have a significant impact on the simulation radiation data and a three-order Fourier series was good enough to approximate the actual solar radiation. For a typical summer day, the average cooling capacity of the chiller at peak hour (13:00) is around 11 kW while the cyclic chiller system coefficient of performance (COP) and solar system COP are around 0.5 and 0.3, respectively. The economic analysis showed that the payback period for the solar adsorption system studied was about 11 years and the optimal solar collector area was around 38 m2 if a compound parabolic collector (CPC) panel was used. The study indicated that the utilization of the solar-driven adsorption cooling is economically and technically viable for weather conditions like those in Perth, Australia.

MASALAH DAN ALTERNATIF TEKNOLOGI PENGOLAHAN AIR UNTUK MASYARAKAT MISKIN KOTA

2018 ◽  
Vol 6 (3) ◽  
Author(s):  
Arie Herlambang
Keyword(s):  
Water Treatment ◽  
Ground Water ◽  
Potable Water ◽  
Diarrheal Disease ◽  
Low Cost ◽  
Clean Water ◽  
Treatment Technology ◽  
Alternative Technologies ◽  
The Poor ◽  
Daily Water

Clean water to poor communities who live in crowded municipal area is stillexpensive and a luxury. This condition is evidenced by the number of people whouse ground water for their daily water, because water taps still seems expensivefor them. Diarrheal disease is still relatively high for Indonesia, where nearly 16thousand people suffer from diarrhea due to poor sanitation. To help the poor inthe city, there are several alternative technologies that can be applied to publicaccess to clean water and adequate low-cost, including ground water treatmenttechnology with a filter system equipped with an ultraviolet sterilizer, or ozonegenerators, or using ultrafiltration, if possible can also use the reverse osmosismembrane that for fresh water. Arsinum is the best alternative should be chosenfor fulfilled potable water in slump area.Keywords : Sanitation, water treatment technology, portable water, low-cost, slump area

scholarly journals Ultralow-temperature-driven water-based sorption refrigeration enabled by low-cost zeolite-like porous aluminophosphate

2022 ◽  
Vol 13 (1) ◽  
Author(s):  
Zhangli Liu ◽  
Jiaxing Xu ◽  
Min Xu ◽  
Caifeng Huang ◽  
Ruzhu Wang ◽  
...  
Keyword(s):  
Low Temperature ◽  
Water Sorption ◽  
High Performance ◽  
Global Climate ◽  
Low Cost ◽  
Cost Effective ◽  
High Water ◽  
Coefficient Of Performance ◽  
High Efficient ◽  
Water Based

AbstractThermally driven water-based sorption refrigeration is considered a promising strategy to realize near-zero-carbon cooling applications by addressing the urgent global climate challenge caused by conventional chlorofluorocarbon (CFC) refrigerants. However, developing cost-effective and high-performance water-sorption porous materials driven by low-temperature thermal energy is still a significant challenge. Here, we propose a zeolite-like aluminophosphate with SFO topology (EMM-8) for water-sorption-driven refrigeration. The EMM-8 is characterized by 12-membered ring channels with large accessible pore volume and exhibits high water uptake of 0.28 g·g−1 at P/P0 = 0.2, low-temperature regeneration of 65 °C, fast adsorption kinetics, remarkable hydrothermal stability, and scalable fabrication. Importantly, the water-sorption-based chiller with EMM-8 shows the potential of achieving a record coefficient of performance (COP) of 0.85 at an ultralow-driven temperature of 63 °C. The working performance makes EMM-8 a practical alternative to realize high-efficient ultra-low-temperature-driven refrigeration.

scholarly journals Design and construction of low-cost respiration chambers for ruminal methane measurements in ruminants

2017 ◽  
Vol 8 (2) ◽  
pp. 185 ◽  
Author(s):  
Jorge Rodolfo Canul Solis ◽  
Angel Trinidad Piñeiro Vázquez ◽  
Jeyderl Israe Arceo Castillo ◽  
José Alayón Alayón Gamboa ◽  
Armín Javier Ayala Burgos ◽  
...  
Keyword(s):  
Methane Production ◽  
Low Cost ◽  
Bos Indicus ◽  
Mass Action ◽  
Pennisetum Purpureum ◽  
Air Conditioner ◽  
Tropical Regions ◽  
In Vivo Measurement ◽  
Design Construction

ABSTRACTRuminant animals contribute significantly to methane emissions in tropical regions. Nonetheless, there are few facilities available in those regions of the world for in vivo measurement of methane production in cattle. The aim of the present work was to describe the design, construction and operation of respiration chambers for in vivo measurement of methane production in cattle in Mexico. Locally available materials were used in the construction. Walls, roof and doors were constructed of thermic panels with two windows of acrylic at the front so the animal can be observed at all times. Chambers have an air volume of 9.97 m3. Air is drawn from the chamber at a rate of 500 L/min by the effect of mass action flow generators. Methane was measured in air samples with an infrared analyzer. Chambers operate under a slight negative pressure of around -500 Pa. Air temperature inside the chambers is kept at 23 °C with an air conditioner, while relative humidity is maintained at 55 % with a dehumidifier. Functioning of the chambers was evaluated in Bos indicus, Nelore cattle fed Taiwan grass (Pennisetum purpureum) and a concentrate (18 % crude protein), and measurements were made during runs of 23 h duration. Methane production was on average 173.2 L per day, while the emission factor was 17.48 L methane per kilogram o dry matter consumed. It concludes that this respiration facility is capable of measuring methane production accurately in cattle fed tropical rations.

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