Introduction of Solar Drying Technology to Trinidad and Tobago

Mangat, Sunny; McTaggart, Matt; Marx, Jim; Baker, Simon; Luboschik, Ulrich

doi:10.2175/193864709793954006

Cited by 5 publications

(6 citation statements)

References 4 publications

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“…Initial work performed at the OSP indicated that the interior of the chamber could get up to 100ºF during daylight hours, with significant heat losses overnight. Evaporation rates for greenhouse applications range from 1 kg water/m 2 -day (Bux and Bauman 2003) to 2.2 kg water/m 2 -day (Mangat et al 2009). Success of the pilot unit was therefore measured against these industry figures, while also acknowledging that the chamber was not constructed as an ideal solar dryer would be.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of Solar Technology in a Biosolids Drying Application

Sierra¹,

Glucs²,

Miot³

et al. 2010

proc water environ fed

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The San Francisco Public Utilities Commission (SFPUC) decided to evaluate whether advances in solar heating technologies are such that a compact solar dryer could be feasibly installed for biosolids drying at one of the City of San Francisco's two urban treatment plants. An experimental chamber was constructed to test the solar drying concept. Temperature inside and outside of the chamber was measured using an Onset HOBO™ data logger, capable of taking and recording periodic temperature measurements. Results of experiments conducted with biosolids indicate that this technology could be promising for an urban drying application.

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Section: Resultsmentioning

confidence: 99%

Evaluation of Solar Technology in a Biosolids Drying Application

Sierra¹,

Glucs²,

Miot³

et al. 2010

proc water environ fed

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show abstract

“…Evaporation rates (daily averages) for greenhouse applications range from 1 kg/m 2 -day (Bux and Bauman 2003) to 2.2 kg/m 2 -day [6]. Success of the pilot unit was therefore measured against these industry figures, while also acknowledging that the chamber was not constructed as an ideal solar dryer would be.…”

Section: Discussionmentioning

confidence: 99%

“…Success of the pilot unit was therefore measured against these industry figures, while also acknowledging that the chamber was not constructed as an ideal solar dryer would be. For example, a more demonstration scale model would be better insulated to protect against However the limitations of the experiment as conducted, the evaporation rate for the mixed sample is 121% higher than current state of the art for solar biosolids dryers [6].…”

Section: Discussionmentioning

confidence: 99%

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Enhanced Biosolids Drying with a Solar Thermal Application

Jolis¹

2017

J Fundam Renewable Energy Appl

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Covered, green-house type biosolids solar drying facilities provide a low-energy option with operational simplicity and reduced cost. However, their large footprint consequence of low water evaporation rates make them unattractive for large wastewater treatment plants in urban areas with limited available space. This project investigated whether recent advances made in solar thermal technology conferred sufficient benefit in water evaporation rates that solar drying of wastewater biosolids may be feasible. A demonstration solar drying chamber was constructed with warm air from a solar thermal panel being routed to the chamber to aid in evaporation. Experiments were conducted with water alone to measure water evaporation rates in a range of weather conditions and to develop a regression model for evaporation. Experiments were also conducted with digested, dewatered biosolids to measure evaporation rates when drying biosolids. Total solids concentration in biosolids samples reached 42.3% after 102 hours in the dryer. Data showed that evaporation rates strongly depend on the temperature inside the dryer chamber but also on biosolids mixing. Measured evaporation rates were more than twice those previously reported in the literature for solar dryers and imply that with an experimental setup optimized for mixing, humidity control and energy recovery, still higher rates could be achieved. If confirmed in larger scale demonstration projects, the results from this study would allow for compact solar dryers to be located in urban settings.

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“…Typically, 90% and 70% DS are achieved by thermal dryers and GSDs, respectively (Flaga, 2007;Mangat et al, 2009;Bux and Baumann, 2003;Ritterbusch and Bux, 2012). Therefore, a GSD should be supported with auxiliary heat in order to reach higher DS (i.e.…”

Section: Cost Functionsmentioning

confidence: 99%

Evaluation of solar sludge drying alternatives by costs and area requirements

2015

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Thermal drying is a common method to reach above 90% dry solids content (DS) in sludge. However, thermal drying requires high amount of energy and can be expensive. A greenhouse solar dryer (GSD) can be a cost-effective substitute if the drying performance, which is typically 70% DS, can be increased by additional heat. In this study feasibility of GSD supported with solar panels is evaluated as an alternative to thermal dryers to reach 90% DS. Evaluations are based on capital and O&M costs as well as area requirements for 37 wastewater treatment plants (WWTPs) with various sludge production rates. Costs for the supported GSD system are compared to that of conventional and co-generation thermal dryers. To calculate the optimal costs associated with the drying system, an optimization model was developed in which area limitation was a constraint. Results showed that total cost was minimum when the DS in the GSD (DS(m,i)) was equal to the maximum attainable value (70% DS). On average, 58% of the total cost and 38% of total required area were associated with the GSD. Variations in costs for 37 WWTPs were due to differences in initial DS (DS(i,i)) and sludge production rates, indicating the importance of dewatering to lower drying costs. For large plants, GSD supported with solar panels provided savings in total costs especially in long term when compared to conventional and co-generation thermal dryers.

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Introduction of Solar Drying Technology to Trinidad and Tobago

Cited by 5 publications

References 4 publications

Evaluation of Solar Technology in a Biosolids Drying Application

Evaluation of Solar Technology in a Biosolids Drying Application

Enhanced Biosolids Drying with a Solar Thermal Application

Evaluation of solar sludge drying alternatives by costs and area requirements

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