Analysis of woodchip heating capacity calculated according to technical standards and measurements of calorific value

Lieskovský, Martin; Dvořák, Jiří; Natov, Pavel; Chojnacki, J.; Rokosz, Krzysztof

doi:10.17221/70/2014-jfs

Cited by 3 publications

(2 citation statements)

References 2 publications

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“…Weight of raw fuel wood of white acacia 780 kg/m 3 was determined (Lieskovský et al 2014). From the determination of the weight of fuel wood for heating period (5,450.97 kg) the volume of raw fuel wood needed after extraction was determined as 6.99 m 3 (30% of moisture).…”

Section: Heating Costsmentioning

confidence: 99%

“…The studies compared heating values obtained through relative moisture measurements according to the Slovak technical standards and through determination of net calorific value according to the ISO 1928the ISO :2003 standard. Based on the established facts it may be said that heating capacity values obtained using both studied methodologies differ significantly in the sample set (Kumar et al 1999;ManzanoAgugliaro et al 2013;Lieskovský et al 2014;Freitas et al 2015).…”

Section: Heating Costsmentioning

confidence: 99%

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The effectiveness of heating of housing unit by renewable energy source

Jobbágy¹,

Krištof²,

Andacký³

2016

Res. Agric. Eng.

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Jobbágy J., Krištof K., Andacký M. (2016): The effectiveness of heating of housing unit by renewable energy source. Res. Agr. Eng., 62 (Special Issue): S34-S43.The paper is aimed at pointing out possibilities of using of dendromass for heating. The object of interest was heating of housing units with 75.27 m 2 of total area. The average value of dendromass moisture was 17.71%. The inserted fireplace Nordica Focolare 70 with a nominal output of 9 kW was used as a heat source. For temperature measurement, a non-contact infrared thermometer GM 900 was used. The total heat loss transferred through walls of housing unit (heat loss through thermal bridges and ventilation losses) were calculated at the value of 176.26 W/K. Based on the results of samples moisture the net calorific value of one kilogram of burned fuel wood was determined (14.791 MJ kg). The amount of thermal energy which is necessary to supply by the heating system for the whole heating period was 14,199.18 kWh. The weight of raw fuel wood was 5,450.97 kg (at moisture of 30%), dried at 17.71% (4,636.87 kg). Price of raw fuel wood of acacia for the year under evaluation was 64.80 €/m 3 (the required amount of raw fuel wood for heating period was 10 m 3 ). Total costs for the heating season was thus 648 €. The price of heat transmitted by the fireplace inset Nordica Focolare 70 inserted into heating system using fuel wood (white acacia) with 17.71% of absolute moisture was 0.045636 €/kWh.

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Section: Heating Costsmentioning

confidence: 99%

Section: Heating Costsmentioning

confidence: 99%

The effectiveness of heating of housing unit by renewable energy source

Jobbágy¹,

Krištof²,

Andacký³

2016

Res. Agric. Eng.

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Multiscale modeling and control of pulp digester under fiber-to-fiber heterogeneity

Son

Choi

Kwon

2020

Computers & Chemical Engineering

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Conversion of Norway spruce (Picea abies (L.) H. Karst.) tree stem volume to volumes of produced logging residues and wood chips

Dvořák

Martin

Kormanek

et al. 2023

Forestry: An International Journal of Forest Research

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As a renewable fuel, logging residues, as well as other dendromass, are in high demand. On the other hand, they can serve as a natural fertilizer and stabilize biodiversity in forest ecosystems. Therefore, they need to be used rationally, with due care for the volumes extracted from a particular stand. The volume of logging residues is difficult to measure; thus, foresters need a tool to estimate it, ideally via a simple method based on easily measurable parameters. Conversion factors, based on tree stem volume can serve this purpose. In this study, we develop such conversion factors for thinnings of Norway spruce (Picea abies (L.) H. Karst.) stands. First, we analyzed the relationship between the tree stem volume (ranging between 0.03 and 0.44 m3 stem−1) and the volumes of related logging residues or wood chips via linear regression and correlation analysis. Then, we assessed the significance of differences between volumes of logging residues or wood chips for trees in the five relevant stem volume classes and determined appropriate conversion factors. The conversion factors for wood chips ranged between 1.37 loose cubic meters of logging residue per cubic meter of timber in the largest stem volume class to 2.17 for the smallest stem volume class. The model, on which the conversion factors were based had a coefficient of determination of 0.88. Conversion to logging residue volume yielded factors ranging from 2.2 stacked cubic meters per cubic meter of timber for the largest stem volume class to 10.2 in the smallest stem volume class. The coefficient of determination of the underlying model was 0.69. The conversion factors are based on sufficiently accurate models and can be used in practical forestry for planning purposes, recordkeeping, and remuneration of loggers.

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Analysis of woodchip heating capacity calculated according to technical standards and measurements of calorific value

Cited by 3 publications

References 2 publications

The effectiveness of heating of housing unit by renewable energy source

The effectiveness of heating of housing unit by renewable energy source

Multiscale modeling and control of pulp digester under fiber-to-fiber heterogeneity

Conversion of Norway spruce (Picea abies (L.) H. Karst.) tree stem volume to volumes of produced logging residues and wood chips

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