Abstract
We studied the potential of the tree residue corer for taking samples for measurements of moisture content in felling residues, branches, and tops. During the summer of 1992 a total of 47 stacks of felling residues were included in the study. Of these, 15 were covered with wood pulp board. The remaining 32 stacks were left uncovered. The stacks remained at the felling site until February 1993, when they were transported to an industrial plant for weighing, test sampling and moisture determination. The study gave the following results: - The study cannot demonstrate any systematic over- or underestimation of moisture content when sampling with corer equipment in comparison with the crushed material; - The fresh weight of the corer shavings was, on average, 150 g for the uncovered stacks and 120 g for the covered stacks. However, there were large differences in weight between the different corer samples, mainly because of variations in the structure of the material; - The difference in moisture content between the arithmetic and the weighted mean value was small, regardless of whether ten or two samples were taken per load; - The precision of the measurement depends on load size, size of random sample, and
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Yngvesson, M
[1]
- Swedish Univ. of Agricultural Sciences, Ultuna (Sweden)
Citation Formats
Yngvesson, M.
Moisture content determination in felling residues; Fukthaltsbestaemning i avverkningsrester.
Sweden: N. p.,
1993.
Web.
Yngvesson, M.
Moisture content determination in felling residues; Fukthaltsbestaemning i avverkningsrester.
Sweden.
Yngvesson, M.
1993.
"Moisture content determination in felling residues; Fukthaltsbestaemning i avverkningsrester."
Sweden.
@misc{etde_10150328,
title = {Moisture content determination in felling residues; Fukthaltsbestaemning i avverkningsrester}
author = {Yngvesson, M}
abstractNote = {We studied the potential of the tree residue corer for taking samples for measurements of moisture content in felling residues, branches, and tops. During the summer of 1992 a total of 47 stacks of felling residues were included in the study. Of these, 15 were covered with wood pulp board. The remaining 32 stacks were left uncovered. The stacks remained at the felling site until February 1993, when they were transported to an industrial plant for weighing, test sampling and moisture determination. The study gave the following results: - The study cannot demonstrate any systematic over- or underestimation of moisture content when sampling with corer equipment in comparison with the crushed material; - The fresh weight of the corer shavings was, on average, 150 g for the uncovered stacks and 120 g for the covered stacks. However, there were large differences in weight between the different corer samples, mainly because of variations in the structure of the material; - The difference in moisture content between the arithmetic and the weighted mean value was small, regardless of whether ten or two samples were taken per load; - The precision of the measurement depends on load size, size of random sample, and the number of sample cores per sampled load. The fixed measuring cost for the sampling unit at a heating plant producing 200 000 MWh/year is slightly more than 2 SEK/MWh with a 5-year depreciation period. If the depreciation period is doubled, then the cost decreases by almost 1 SEK/MWh. If all loads are measured in the delivery programme and three samples are taken per load, the variable cost will be about 1.50 SEK/MWh when the fuel has a moisture content of 45 % and the load weight is 20 tonnes. The random sampling method enables the variable cost to be reduced. 12 refs, 3 figs, 16 tabs}
place = {Sweden}
year = {1993}
month = {Oct}
}
title = {Moisture content determination in felling residues; Fukthaltsbestaemning i avverkningsrester}
author = {Yngvesson, M}
abstractNote = {We studied the potential of the tree residue corer for taking samples for measurements of moisture content in felling residues, branches, and tops. During the summer of 1992 a total of 47 stacks of felling residues were included in the study. Of these, 15 were covered with wood pulp board. The remaining 32 stacks were left uncovered. The stacks remained at the felling site until February 1993, when they were transported to an industrial plant for weighing, test sampling and moisture determination. The study gave the following results: - The study cannot demonstrate any systematic over- or underestimation of moisture content when sampling with corer equipment in comparison with the crushed material; - The fresh weight of the corer shavings was, on average, 150 g for the uncovered stacks and 120 g for the covered stacks. However, there were large differences in weight between the different corer samples, mainly because of variations in the structure of the material; - The difference in moisture content between the arithmetic and the weighted mean value was small, regardless of whether ten or two samples were taken per load; - The precision of the measurement depends on load size, size of random sample, and the number of sample cores per sampled load. The fixed measuring cost for the sampling unit at a heating plant producing 200 000 MWh/year is slightly more than 2 SEK/MWh with a 5-year depreciation period. If the depreciation period is doubled, then the cost decreases by almost 1 SEK/MWh. If all loads are measured in the delivery programme and three samples are taken per load, the variable cost will be about 1.50 SEK/MWh when the fuel has a moisture content of 45 % and the load weight is 20 tonnes. The random sampling method enables the variable cost to be reduced. 12 refs, 3 figs, 16 tabs}
place = {Sweden}
year = {1993}
month = {Oct}
}