Vietnamese Low Cost SRR Dryer - IRRI Rice Knowledge Bank
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3/11/2015 Vietnamese low cost SRR dryer IRRI Rice Knowledge Bank http://www.knowledgebank.irri.org/training/factsheets/postharvestmanagement/dryingfactsheetcategory/item/vietnameselowcostsrrdryerfactsheet?tm… 1/3 Vietnamese low cost SRR dryer What is a lowcost (SRR*) dryer? A lowcost dryer is a farmlevel dryer that removes water from wet grains by forcing ambient air or slightly preheated air through the grain bulk that is stored in a circular bamboo bin. It is a batch dryer—i.e., the same quantity of grain is kept stationary in a holding bin until drying is completed. It is suitable for farmers with small rice fields (~1 ha). Why do we use an SRR dryer? The SRR dryer is the only rice dryer that has gained acceptance as a farmlevel dryer. It is affordable (costs between $100 and 200) and produces better quality grain than sun drying. It uses the lowtemperature drying principle. The SRR dryer is slightly cheaper than the STR dryer and has lower labor requirement, though drying time is much longer. How do we use the SRR dryer? Features Easy to operate Mobile Can be used for rice, corn, peanuts and other commodities Simple design allows local production and ensures easy maintenance and repair Operation (electric heater) During day time (8 am – 6 pm), the fan is turned ON, and the resistor is turned OFF. First night: With fan ON, the resistor can either be ON or OFF. If the resistor is used, drying time is reduced but energy consumption is higher. Second night: Both fan and resistors are ON. Without supplemental heat, moisture content of paddy near the inner cylinder might be low enough to be rewetted by ambient air of high relative humidity. Third and succeeding nights: Both fan and resistors are turned OFF. Paddy moisture content has been reduced to a level low enough that allows for waiting for the next day to use heat content in the air. Monitor moisture content and temperature regularly. Stop drying when average moisture content reaches the desired final moisture content.
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Transcript of Vietnamese Low Cost SRR Dryer - IRRI Rice Knowledge Bank
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3/11/2015 VietnameselowcostSRRdryerIRRIRiceKnowledgeBank
http://www.knowledgebank.irri.org/training/factsheets/postharvestmanagement/dryingfactsheetcategory/item/vietnameselowcostsrrdryerfactsheet?tm 1/3
VietnameselowcostSRRdryerWhatisalowcost(SRR*)dryer?Alowcostdryerisafarmleveldryerthatremoveswaterfromwetgrainsbyforcingambientairorslightlypreheatedairthroughthegrainbulkthatisstoredinacircularbamboobin.Itisabatchdryeri.e.,thesamequantityofgrainiskeptstationaryinaholdingbinuntildryingiscompleted.Itissuitableforfarmerswithsmallricefields(~1ha).
WhydoweuseanSRRdryer?TheSRRdryeristheonlyricedryerthathasgainedacceptanceasafarmleveldryer.Itisaffordable(costsbetween$100and200)andproducesbetterqualitygrainthansundrying.Itusesthelowtemperaturedryingprinciple.TheSRRdryerisslightlycheaperthantheSTRdryerandhaslowerlaborrequirement,thoughdryingtimeismuchlonger.
HowdoweusetheSRRdryer?
Features
EasytooperateMobileCanbeusedforrice,corn,peanutsandothercommoditiesSimpledesignallowslocalproductionandensureseasymaintenanceandrepair
Operation(electricheater)
Duringdaytime(8am6pm),thefanisturnedON,andtheresistoristurnedOFF.
Firstnight:WithfanON,theresistorcaneitherbeONorOFF.Iftheresistorisused,dryingtimeisreducedbutenergyconsumptionishigher.
Secondnight:BothfanandresistorsareON.Withoutsupplementalheat,moisturecontentofpaddyneartheinnercylindermightbelowenoughtoberewettedbyambientairofhighrelativehumidity.
Thirdandsucceedingnights:BothfanandresistorsareturnedOFF.Paddymoisturecontenthasbeenreducedtoalevellowenoughthatallowsforwaitingforthenextdaytouseheatcontentintheair.
Monitormoisturecontentandtemperatureregularly.Stopdryingwhenaveragemoisturecontentreachesthedesiredfinalmoisturecontent.
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3/11/2015 VietnameselowcostSRRdryerIRRIRiceKnowledgeBank
http://www.knowledgebank.irri.org/training/factsheets/postharvestmanagement/dryingfactsheetcategory/item/vietnameselowcostsrrdryerfactsheet?tm 2/3
Considerations
Increasingthetemperaturereducesdryingtimebutresultsinunevendrying.Increasingtheairflowshortensdryingtimeandreducesthemoisturecontentbutincreasesenergycost.
Technicalspecifications
Dryingperformance
Capacity 1tbatch1
Grainlayer Upto1m,dependingincapacity
Dryingairtemperature
Ambienttemperatureandslightlypreheatedair(lowtemperaturedrying),59Caboveambientair
Dryingtime 4daysfrom24%to14%
Dryingrate 0.1%h1
Dryingbin
Circular,madefrombamboomatsorwiremesh
Fanandheateroptions
Fan Twostageaxialfanmadefromautomotivefanrotors
Airvolumeflowrate 0.35m3s1
Pressurecreation 350Pa
Electricmotor 0.7kW
Alternative Electricheater:1,000W
*SRRisaVietnamesetermmeaningLowCost
Withinformationfrom:
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3/11/2015 VietnameselowcostSRRdryerIRRIRiceKnowledgeBank
http://www.knowledgebank.irri.org/training/factsheets/postharvestmanagement/dryingfactsheetcategory/item/vietnameselowcostsrrdryerfactsheet?tm 3/3
CenterforAgriculturalEnergyandMachinery,NongLamUniversity,NLUThuDucDistrict,HoChiMinhCity,Vietnam.Email:[email protected]
Formoreinformation:
VisittheRiceKnowledgeBankwebsite(http://www.knowledgebank.irri.org),[email protected]+6325805600.
PreparedbyMGummertwithinputsfromJFRickman(2004)updatedbyMGummert(2010)
