Towards thermal design optimization of tubular digesters in cold climates: A heat transfer model

Perrigault, Thibault; Weatherford, Vergil; Martí-Herrero, Jaime; Poggio, Davide

doi:10.1016/j.biortech.2012.08.019

Cited by 66 publications

(43 citation statements)

References 22 publications

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“…The results of the present study were more moderate, i.e. insulation increased digestate temperature by 1.5°C compared to the results reported by Garfi et al (2011) that showed an increase of 8.4°C and Perrigault et al (2012) who estimated an increase of 2.1°C. The difference may be due to the fact that the higher feeding rates in this study contributed to cooling of the digesters.…”

Section: Resultscontrasting

confidence: 85%

“…Temperature measurements at depths of 140 and 180 cm in the insulated and uninsulated digesters showed that digester temperature was significantly related to the month and that the presence of insulation significantly increased the temperature of the biomass in the digester (p<0.0001), confirming that heat loss can be avoided by insulating the digester cover (Wu and Bibeau, 2006; Garfi et al, 2011; Perrigault et al, 2012). In addition, the calculation of Wu and Bibeau (2006) shows that heat is also lost through the digester walls down to depths of 150 cm.…”

Section: Resultsmentioning

confidence: 88%

“…The temperatures in the soil and in the digester were higher than those in the air or in the mixing tank, as shown by Perrigault et al (2012) who showed that the temperature of an unheated digester followed the trend of the ambient temperature. The fact of the soil having a higher temperature than the mixing tank is most probably due to solar heating since soil temperature is higher than air temperature during winter (Huixian et al, 2009).…”

Section: Resultsmentioning

confidence: 90%

See 2 more Smart Citations

Factors Affecting Process Temperature and Biogas Production in Small-scale Rural Biogas Digesters in Winter in Northern Vietnam

Pham

Vu²,

Sommer³

et al. 2014

Asian Australas. J. Anim. Sci

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This study investigated the main factors influencing digester temperature and methods to reduce heat losses during the cold season in the subtropics. Four composite digesters (two insulated and two uninsulated) were buried underground to measure their internal temperature (°C) at a depth of 140 cm and 180 cm, biogas production and methane (CH4) concentration in biogas from August to February. In parallel the temperature of the air (100 cm above ground), in the slurry mixing tank and in the soil (10, 100, 140, and 180 cm depth) was measured by thermocouple. The influent amount was measured daily and the influent chemical composition was measured monthly during the whole experimental period. Seasonal variations in air temperature significantly affected the temperature in the soil, mixing tank and digester. Consequently, biogas production, which is temperature dependent, was influenced by the season. The main factors determining the internal temperature in the digesters were insulation with Styrofoam, air temperature and temperature of slurry in the mixing tank. Biogas production is low due to the cold climate conditions in winter in Northern Vietnam, but the study proved that storing slurry in the mixing tank until its temperature peak at around 14:00 h will increase the temperature in the digester and thus increase potential biogas production. Algorithms are provided linking digester temperature to the temperature of slurry in the mixing tank.

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Section: Resultscontrasting

confidence: 85%

Section: Resultsmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 90%

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Factors Affecting Process Temperature and Biogas Production in Small-scale Rural Biogas Digesters in Winter in Northern Vietnam

Pham

Vu²,

Sommer³

et al. 2014

Asian Australas. J. Anim. Sci

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“…While during the beginning of the winter, where almost all of the nights freeze, the temperatures drop to 14.6 and 14.7°C for Dh5 and Dh6. Perrigault et al (2012) report a low cost tubular digester adapted to cold climate that reaches 24.5°C of slurry temperature, increasing with 8.4°C the mean ambient temperature. This data is very similar to the four cases of the present study where the slurry temperature is 7.8 to 8.3°C above the mean temperature, indicating a similar performance for all the highland low cost tubular digesters adapted to cold climate.…”

Section: Feeding Pattern Of Digestersmentioning

confidence: 98%

The influence of users' behavior on biogas production from low cost tubular digesters: A technical and socio-cultural field analysis

Martí-Herrero

Cerón

Garcia³

et al. 2015

Energy for Sustainable Development

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“…The greenhouse increased the temperature during the daytime but was only able to maintain an acceptable nighttime temperature when insulation was used in the construction. In South America, greenhouse heating of a bag digester increased the slurry temperature [19].…”

Section: Construction and Management Of Simple Small Digestersmentioning

confidence: 99%

Decision Support for the Construction of Farm-Scale Biogas Digesters in Developing Countries with Cold Seasons

Rennuit

Sommer

2013

Energies

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Biogas production is a clean renewable energy source that can improve lives in developing countries. However, winter temperatures in some areas are too low to enable enough biogas production in small unheated digesters to meet the energy requirements of households. Low-cost, high yield reactors adapted to the local climate are needed in those situations. A decision-support model was developed to assist in the design of biogas reactors capable of meeting households' year-round energy needs. Monthly biogas production relative to household energy needs was calculated for the scenario of suburban Hanoi, Vietnam. Calculations included pig number, slurry (manure water mixture) dilution, retention time and biogas/solar heating. Although using biogas to heat the digester increased biogas production, it did not lead to an energy surplus, particularly with the 1:9 slurry dilution rate commonly used on pig farms. However, at a 1:3 slurry dilution, the use of solar heating to provide 90% and biogas 10% of the heat required to heat the digester to 35 °C improved the biogas production by 50% compared to psychrophilic production. The energy needs of an average five-person family throughout the year required 17 fattening pigs. This model can establish the best solution for producing sufficient energy throughout the year.Keywords: anaerobic digestion; developing countries; psychrophilic; heating; methane production; mathematical modeling; mesophilic

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Towards thermal design optimization of tubular digesters in cold climates: A heat transfer model

Cited by 66 publications

References 22 publications

Factors Affecting Process Temperature and Biogas Production in Small-scale Rural Biogas Digesters in Winter in Northern Vietnam

Factors Affecting Process Temperature and Biogas Production in Small-scale Rural Biogas Digesters in Winter in Northern Vietnam

The influence of users' behavior on biogas production from low cost tubular digesters: A technical and socio-cultural field analysis

Decision Support for the Construction of Farm-Scale Biogas Digesters in Developing Countries with Cold Seasons

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