Tag Archives: drying

713–719 P. Heřmánek, A. Rybka and I. Honzík
Experimental chamber dryer for drying hops at low temperatures
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Experimental chamber dryer for drying hops at low temperatures

P. Heřmánek*, A. Rybka and I. Honzík

Czech University of Life Sciences Prague, Faculty of Engineering, Department of Agricultural Machines, Kamýcká 129, CZ165 00 Praha 6 – Suchdol, Czech Republic
*Correspondence: hermanek@tf.czu.cz

Abstract:

Hop drying takes a significant part in growers’ costs of the final product processing. The current drying technology is based on drying at the drying air temperature of 55–60 °C for 6–9 hours to the final moisture content of about 10%. However, the process results in irreversible transformations and losses of, inter alia, heat labile substances contained in hops.
The experimental chamber dryer was tested at harvest in 2016. Assays hop drying were carried out at a temperature of the drying medium 40 °C. The research results in the form of an experimental new experimental chamber dryer will be used for testing of drying technologies at lower temperatures of the drying medium.
This is what will enable to preserve the quality of aroma as well as other characteristics of the components contained in hops.

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202-211 Xu Ma, R.H. Driscoll and G. Srzednicki
Development of in-store dryer model for corn for varying inlet conditions
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Development of in-store dryer model for corn for varying inlet conditions

Xu Ma, R.H. Driscoll and G. Srzednicki*

UNSW Australia, School of Chemical Engineering, Sydney NSW 2032 Australia;
*Correspondence: g.srzednicki@unsw.edu.au

Abstract:

Many thin layer drying models have been developed for constant inlet conditions. During deep bed drying, drying air conditions vary with position in the bed and also vary with time, so models developed for thin layers under constant conditions are not valid for deep bed drying analysis. A new thin layer drying rate model (called the two-layer model) is presented which allows for varying air conditions. The model was applied to corn by retro-fitting the model to Page’s mode as fitted by Li and Morey (1984). The model was then incorporated into a deep bed simulation, and the results compared with pilot plant drying data. During drying experiments, constant air conditions and varying air conditions were both tested. For constant conditions, all models gave reasonable agreement, but for varying drying conditions, the diffusion model showed an ability to respond better to changes.

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267-274 A. Aboltins and J. Palabinskis
New types of air heating solar collectors and their use in drying agricultural products
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New types of air heating solar collectors and their use in drying agricultural products

A. Aboltins* and J. Palabinskis

Institute of Agricultural Machinery, Latvia University of Agriculture, Cakstesblvd. ⁵, Jelgava, LV – ³00¹, Latvia;
*Correspondence: aivars.aboltins@inbox.lv

Abstract:

The  aim  of  this  research  was  to  make  new  types  of  air  heating  solar  collection  foragricultural production drying and check their operation. In ²0¹¹ and ²0¹² were obtained twoLatvian Republic Patents for air heating solar collectors. One for an autonomous, compact air-heating solar collector, the other one for a cylindrical crop production drying device with solarcollector  that  can  be  used  for  drying  products.  So  there  are  two  different  types  of  dryingfacilities with solar collectors using sun-warmed air: cylindrical crop production drying device,and  autonomous,  compact  crop  production  drying  facility.  Cylindrical  facility  is  tested  fordrying  ¹⁹.⁵%  wet  wheat.  Autonomous,  compact  crop  production  drying  facility  is  tested  forfresh  carrots  and  apples  ⁵–¹0 mm  slices  drying,  using  ambient  air,  heated  with  the  solarcollector.  For  experimental  results  on  carrot  and  apple  slices  the  layers  of  humidity  andtemperature  changes  in  the  drying  process  are  given.  Grain  temperature  distribution  in  wetwheat layers during drying with heated ambient air depending from sun radiation is given.

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529-532 A. Pasila
Changes, challenges and opportunities in the wood energy supply chain
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Changes, challenges and opportunities in the wood energy supply chain

A. Pasila

Seinäjoki University of Applied Sciences, School of Agriculture and Forestry,Ilmajoentie ⁵²⁵, ⁶0⁸00 Ilmajoki, Finland;
e-mail: antti.pasila@seamk.fi

Abstract:

One of the biggest challenges in using bioenergy has been the problem of logistics;that is how, in many cases, to process and transport these low density and bulky raw materials.Finnish  forestry  technology  is  advanced  and  the  same  machinery  which  is  used  in  timberharvesting is often used in energy wood harvesting.A  change  in  the  forest  industry  has  however  caused  some  new  expectations  concerning  thewood  energy  supply  chain.  One  of  the  basic  requirements  for  woodchips  is  low  moisturecontent. In the transportation of wood chips high moisture content, and therefore a high weight,may limit the carrying capacity of vehicles and roads. Also in syngas and charcoal productiondry raw material is needed to be able to control the combustion process.The reduction of moisture content under natural drying conditions means an extended storagetime. With Finnish climate conditions this normally means a storage period of at least one year.The  various  types  of  energy  wood:  stems,  whole  tree  harvested  stems,  logging  residues  orstumps are piled in storage sites and covered. The raw material is chipped or crushed at theseintermediate storage sites and after that transported to bio-refineries.In  the  measurement  of  the  energy  wood’s  quality  and  quantity  there  are  some  differencescompared  to  timber  measurements.  Normally  the  timber  measurements  are  based  on  solidvolume in cubic metres. The forest harvesters are equipped with on-line measurement systems.This  on-line  measurement  is  more  complicated  to  carry  out  in  the  case  of  energy  wood.Especially difficult are the volume measurements in whole tree and stump harvesting. A newmethod used in the measurement of energy wood is weight.

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55-65 G. Pupinis
Grain drying by use of changeable air flow method
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Grain drying by use of changeable air flow method

G. Pupinis

Institute of Agricultural Engineering, Lithuanian University of Agriculture Raudondvaris,LT-51132 Kaunas, Lithuania; e-mail: pupinis@mei.lt

Abstract:

The article describes a new energy saving method for drying grain. The idea of the method is that once moisture released from grain decreases, air discharge going through the grain is reduced as well. ´Roland´ variety of barley with 25% and 30% moisture content was used in the trial. It was dried with a changeable air discharge in order to maintain absorption qualities. After the drying process has begun, air flow to the grain is reduced in the process of drying as the relative moisture content of air passing through decreases. It has been established that the optimum initial air discharge is 800 m3 (t h)-1. During grain drying air discharge is reduced and it can be described by equation0,0114969.85xye−=, R2 = 0.8088.The scheme for a designed and manufactured trial device is presented. Intensity of airdischarge and dynamics of moisture absorption in a layer of dried grain have been established.

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131-140 R. Oleszczuk and T. Brandyk
The analysis of shrinkage-swelling behaviour of peat-moorsh soil aggregates during drying-wetting cycles
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The analysis of shrinkage-swelling behaviour of peat-moorsh soil aggregates during drying-wetting cycles

R. Oleszczuk and T. Brandyk

Department of Environmental Improvement, Warsaw University of Life Sciences(SGGW), ul. Nowoursynowska 159, 02-776 Warsaw, Poland;e-mail:ryszard_oleszczuk@sggw.pl

Abstract:

The aim of this study was to investigate the soil volume changes for moorsh, willow and moss peat layers during drying-wetting cycles. The measurements of soil volume changes were made using the ‘saran resin’ method. The reversible and irreversible shrinkage coefficient values for each layer were calculated. The relationships between soil moisture contents before and after rewetting were estimated for analysed soil aggregates. The performed research showed that the soil volume changes were relatively small for moorsh and the highest for willow and moss peat. After a few drying-wetting cycles, the moorsh soil aggregates also retained the highest amount of water in comparison with willow and moss peat.

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