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1

Drying kinetics of a solar dryer for drying of potato chips in Western Maharashtra, India

Yadav Aditya Arvind, Bagi Jaydeep S., Prabhu Pravin A.

Journal of Mechanical and Energy Engineering

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2022

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Vol. 6, No 1

91--97

EN

The current study focuses on the performance of a solar greenhouse dryer for drying of potato chips in Solar Dryer and Open sun conditions in Western Maharashtra. Potato chips is a value added product that can be effectively used during throughout the year as snacks, a side dish or an appetizer. It can be either deep dried or backed for consumption. The dried potato contains a high fiber content and it helps to lower the cholesterol level in blood reducing the risk of blood pressure if consumed backed. Potato chips can effectively be stored for one year to six months and consumed as snacks. The experiment was conducted for drying of potato chips in Solar Greenhouse Dryer and open sun conditions on 1st of April 2021 for 6 hours. The initial weight of the potato chips to be dried was 500 grams both for the solar greenhouse dryer and open sun drying conditions. The experiment was conducted at Bahe, Borgaon, Tal-Walwa, Dist-Sangli, Maharashtra, India located at 17.115°N and 74.33°E. The experimental observations collected during the tests were set as input data for the Design of the Experiments (DoE) i.e., for Response Surface Modelling (RSM). The main aim of using DoE i.e., Response Surface Modelling, is to obtain an optimum region for drying of potato chips in the Solar Greenhouse Dryer, from the surface plot; the region of maxima and minima was obtained. The contour plot obtained during modeling resembles the optimum region of drying; the optimum region for drying of potato chips is 47 to 50°C respectively. The Moisture Removal Rate (MRR) for drying of potato chips in the Solar Greenhouse Dryer and Open sun drying is 83% and 78% respectively. The drying rate observed during the experiment has a better resemblance with simulated Response Surface Modelling.

2

Hybrydowe instalacje grzewcze wykorzystujące ciepło słoneczne – praktyczny kompromis

Starościk Janusz

Energetyka Rozproszona

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2022

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nr 7

85--97

PL

Obecne działania mające na celu dekarbonizację energetyki i ogrzewnictwa oraz ograniczenie wykorzystania paliw kopalnych zmuszają do poszukiwania rozwiązań, które realnie pozwolą na stopniowe dochodzenie do tego celu bez narażenia użytkowników końcowych na niebezpieczeństwo wynikające z utraty pokrycia zapotrzebowania na ciepło. Zwiększanie udziału odnawialnych źródeł energii w ogrzewaniu jest uzasadnionym działaniem, jednak należy pamiętać, że ich zastosowanie wymaga podwyższania efektywności energetycznej budynków, głównie poprzez ograniczenie ich zapotrzebowania na ciepło. W praktyce jest to trudne do wykonania w krótkim czasie z uwagi na skrajną niejednorodność w konstrukcjach budynków oraz inne czynniki, takie jak preferencje i zasoby finansowe użytkowników końcowych, parametry lokalnych systemów energetycznych i specyfika konstrukcji samych budynków. Dlatego szuka się rozwiązań, które z jednej strony pozwolą na stopniowe zmniejszenie udziału paliw kopalnych i energii elektrycznej ze źródeł konwencjonalnych w ogrzewaniu wraz z postępem realizowanej termomodernizacji, a z drugiej zapewnią odbiorcom bezpieczeństwo energetyczne. Takie rozwiązanie powinno również docelowo prowadzić do ograniczenia kosztów zakupu nośników energii przez zwiększanie udziału dostępnych lokalnie zasobów energii. Warunki te spełniają hybrydowe instalacje grzewcze – składające się z różnych uzupełniających się nawzajem źródeł ciepła połączonych w jeden układ, który automatycznie dostosowuje się do warunków podaży dostępnych lokalnie zasobów. Dobrym tego przykładem jest kombinacja kolektorów słonecznych z magazynem ciepła i dodatkowym źródłem ciepła, odgrywającym rolę źródła szczytowego, dzięki czemu istnieje możliwość zwiększania udziału czystego bezemisyjnego ciepła pochodzącego z kolektorów słonecznych i zagwarantowania stałego komfortu cieplnego odbiorcom.

EN

Current activities aimed at decarbonization the energy and heating supply and reduction of the use of fossil fuels, force us to look for solutions that will realistically allow for a gradual achievement of this goal, without risking the security of covering the heat demand of end users. Increase the share of renewable energy sources in heating is a justified measure, but it should be remembered that their use requires increase the energy efficiency of buildings, mainly by reducing their heat demand. In practice, this is a difficult task to accomplish in a short time due to the extreme heterogeneity in building structures and other various factors such as end-user preferences and their financial resources, available local energy systems and the resources of buildings themselves. Therefore, solutions are sought that will, on the one hand, allow for a gradual reduction in the share of fossil fuels and electricity from conventional sources in heating along with the progress of thermal modernization, and on the other hand, will ensure energy security for consumers. Such a solution should also ultimately lead to the reduction of the purchase costs of energy carriers by increasing the share of locally available energy resources. Hybrid heating installations are such solution. Currently, hybrid heating installations are installations consisting of various complementary heat sources combined into one system that automatically adjusts to the supply conditions of locally available resources. A good example of such an installation is a combination of solar collectors with a heat storage and a supplementary additional heat source, acting as a peak source, thanks to which we have the opportunity to increase the share of clean, emission-free heat from solar collectors and guarantee constant thermal comfort to recipients.

3

Response surface modelling and performance evaluation of solar dryer for drying of grapes

Yadav Aditya Arvind, Prabhu Pravin A., Bagi Jaydeep S.

Journal of Mechanical and Energy Engineering

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2021

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Vol. 5, No 2

157--168

EN

The current study focuses on the performance of the Solar Greenhouse Dryer for drying of grapes for raisin production in the Solar Dryer and Open sun condition in Western Maharashtra. The grape is also known as Vitis Vinifera, and it is a sub-tropical fruit with excess pulp content. The grapes are used as an immune booster as it contains various Phyto-chemicals which reduce various diseases. It is estimated that nearly 80% of grapes produced in India are exported to European countries. The Maharashtra state ranks first in the production of grapes; probably, Western Maharashtra produces nearly 800 thousand tons of grapes every year. The major wastage of grapes is due to a low sugar content, glossy appearance, shrinkage, excess water in the berry, scorching and size variations. Therefore, there is a need to preserve grapes by drying and production of raisins for a non-seasonal requirement. The experiment was conducted for drying of grapes in the Solar Greenhouse Dryer and Open Sun conditions from 1st of April to 4th of April for 48 hours. The initial weight of the grapes to be dried was 500 grams for both the Solar Greenhouse Dryer and Open Sun drying conditions. The experiment was conducted at Bahe, Borgaon, Tal-Walwa, Dist-Sangli, Maharashtra, India located at 17.115oN and 74.33oE. The experimental observations collected during the `experimentation were set as input data for the Design of Experiments i.e., for Response Surface Modelling (RSM). The main aim of using DOE i.e., Response Surface Modelling, is to obtain an optimum region for drying of grapes in the Solar Greenhouse Dryer, from the Surface plot; a region of maxima and minima was obtained. The contour plot obtained during modelling resembles the optimum region of drying, the optimum region for drying grapes is 45 to 50oC respectively. The Moisture Removal Rate (MRR) for drying of grapes in the Solar Greenhouse Dryer and in the Open Sun drying is 73.6% and 57.2% respectively. The drying rate observed during the experiment has a better resemblance with simulated Response Surface Modelling.

4

Numerical simulation and experimental validation of solar greenhouse dryer using finite element analysis for different roof shapes

Yadav Aditya Arvind, Prabhu Pravin A., Bagi Jaydeep S.

Journal of Mechanical and Energy Engineering

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2021

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Vol. 5, No 1

69--79

EN

The present study focuses on the numerical simulation and experimental validation of a Solar Greenhouse Dryer (SGHD). The Solar Dryers are the devices which uses solar energy to dry substances, especially crops with high moisture content, and the word Greenhouse means protection of crops from excess hot or cold climatic conditions and unwanted pests. Thus, Solar Greenhouse Dryer is a device which utilizes solar energy for drying of crops with high moisture content and prevents it from excess climatic conditions and provides optimum range of temperature and prevents the dried product from pests and dust while drying. The numerical simulation of SGHD was performed using Finite Element Analysis software ANSYS 2020 R2. Initially three different roof shapes were modelled using software CATIA V5 R3 namely triangular, trapezoidal and dome shape. The modelled SGHDs was then introduced to ANSYS domain for numerical analysis. The models were initially meshed in ANSYS workbench with unstructured tetrahedral structure of mesh over all the domains. The Solar Ray tracing content was used for numerical simulation of dryers, the solar ray tracing is used to predict direct illumination energy source produced by sun at experimental site. The experiment for no-load test was conducted at Bahe Borgaon, Dist- Sangli, Maharashtra, India at 17.115°N and 74.33°E.

5

Carbon-ammonia adsorption technology for heating and cooling in buildings

Critoph R. E.

Polska Energetyka Słoneczna

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2006

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nr 1-2

31-37

EN

Sorption heat pumps and chillers are a relatively new way of providing efficient heating and cooling from heat sources such as solar energy, biomass, waste heat or conventional fuels. Included within the ´sorption´ description are conventional Li-Br systems for air conditioning, ammonia diffusion absorption machines, silica gel water adsorption chillers now being made in Japan and a number of solid adsorption concepts being developed in the EU. The principles are described, together with the choices of working pair and thermodynamic cycle. There is no one `best`solution for all applications within buildings. The principle applications are: trigeneration systems in which exhaust heat of an engine may be used to provide air conditioning, air conditioning system driven by burning fossil fuels or by solar thermal energy, gas-fired heat pumps for domestic applications. Examples of a number of different solar powered air conditioning systems and trigeneration systems are given. At present, solar powered air conditioning using closed cycles cannot be considered economic, due to the high cost, but it is technically feasible and many examples exist. Trigeneration presents many more commercial opportunities. Gas-fired heat pumps have the greatest potential, both in market and carbon dioxide emission reductions, but are the least developed technology. The research at Warwick focuses on carbon-ammonia adsorption cycles for trigeneration and for gas fired heat pumps /chillers. The key challenge is to improve internal heat transfer in order to both reduce the capital and running costs. The latest developments are in two areas; the use of arrays of low-cost modules and new designs of plate heat exchanger. The construction, expenses, and likely applications of the different systems and their performance is presented. As with all energy conservation technologies, there is a trade-off between capital costs and savings and the balance is discussed.

6

Utilizing the Organic Rankine Cycle for generation of electricity

Bryszewska-Mazurek A., Mazurek W.

Prace Naukowe Instytutu Podstaw Elektrotechniki i Elektrotechnologii Politechniki Wrocławskiej. Konferencje

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2003

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Vol. 39, nr 14

9-20

EN

The Organic Rankine Cycle (ORC) utilizes low-grade heat sources to produce mechanical energy and electricity. The working fluid in the cycle is an organic substance with a low boiling point and a low latent heat. The work presents close type ORC-s using various low-grade heat sources like geothermal energy, solar-thermal energy, waste heat. The conception of experimental ORC utilizing the solar heat pipe collector as a heat source was presented.