Final Drying of Thin Fleece Layer to Prevent Humidity Condensation
Karel Adámek,
Jan Kolář,
Pavel Peukert
Issue:
Volume 3, Issue 1, January 2018
Pages:
1-18
Received:
24 July 2017
Accepted:
1 August 2017
Published:
15 January 2018
Abstract: The paper presents methods of final drying of thin fleece layer after outlet from drying chamber, to prevent the water vapor condensation from material packed in impermeable foil. There are presented results of numerical simulations of possible solutions. Suitable design is not expensive and meets all operational requirements. The supplementary both operational and investment costs are very low.
Abstract: The paper presents methods of final drying of thin fleece layer after outlet from drying chamber, to prevent the water vapor condensation from material packed in impermeable foil. There are presented results of numerical simulations of possible solutions. Suitable design is not expensive and meets all operational requirements. The supplementary bot...
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Estimation of Monthly Average Daily Solar Radiation from Meteorological Parameters: Sunshine Hours and Measured Temperature in Tepi, Ethiopia
Issue:
Volume 3, Issue 1, January 2018
Pages:
19-26
Received:
14 October 2017
Accepted:
1 November 2017
Published:
28 February 2018
Abstract: In this study, several equations were considered to estimate monthly average daily solar radiation from meteorological parameters: Sunshine hours and measured Temperature in Tepi, Ethiopia. These equations include the original Angstrom-Prescott linear regression and modified models (quadratic, polynomial, logarithmic and exponential functions) and temperature based models. The performance of the models was evaluated using the methods of statistical analysis. This study shows that from sunshine hours based models Samuel and Newland models are appropriate for Tepi due to their better statistical model performance analysis. From temperature based models, Chen et al., models fitted the data adequately and can be used to estimate solar radiation from temperature measurement. However, the developed correlation models give better statistical model performance analysis and therefore, it can be recommended that these models are used reasonably well for estimating the solar radiation in Tepi and possibly in its surroundings sites with similar climatic conditions if empirical coefficients are correctly calibrated.
Abstract: In this study, several equations were considered to estimate monthly average daily solar radiation from meteorological parameters: Sunshine hours and measured Temperature in Tepi, Ethiopia. These equations include the original Angstrom-Prescott linear regression and modified models (quadratic, polynomial, logarithmic and exponential functions) and ...
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Assessment of Foreign Material Load in the Management of Faecal Sludge in the Greater Accra Region of Ghana
Issahaku Ahmed,
Ama Mbeaba Quarshie,
Dennis Ofori-Amanfo,
Florence Cobbold,
Eric Simon Amofa-Sarkodie,
Esi Awuah
Issue:
Volume 3, Issue 1, January 2018
Pages:
27-36
Received:
29 January 2018
Accepted:
11 February 2018
Published:
6 March 2018
Abstract: Faecal sludge management has been a burden for most waste managers particularly in developing countries; yet a sure way of preventing the continuous disposal of this waste into drains, bushes water bodies and the environs in general has been by treatment. The introduction of a new treatment plant with the UASB technology in the management process of faecal sludge has been much welcomed as an improved technology for solving the treatment problems of the waste; but this technology is not without some challenges. It has no design criteria for the treatment of other wastes that it screens from faecal sludge. This paper assessed the foreign material load in faecal sludge dislodged at the treatment plant at the Lavender hill a suburb of the Greater Accra region of Ghana. The foreign materials in the faecal sludge were categorized into their material composition or items that were relatively easy to recognized. The characteristic components were Textile/Fabric, Condoms, Gravels, Metal, Glass, Sanitary pads, Rubber/Plastics and Others’ (cotton wool, mobile phones, broom sticks, paper wrappers, cartons, wallets, ID cards, money, feotus). The faecal sludge of Greater Accra region of Ghana contains about 0.24kg of foreign materials per cubic metre of the faecal sludge. Of this composition, the highest contribution was seen to have come from plastics contributing about 36.80%. Sanitary pads, textiles, ‘others’ category, condoms, stones, metals and glasses respectively contributing 29.89%,18.55%, 7.47%, 3.74%, 2.52%, 0.06% and 0.16%. The order of the load of the foreign materials were seen to be in the order of Plastics/Rubbers > Sanitary pads >Textiles/Fabrics > Others > Condoms > Gravels > Glass > Metals. These wastes pose mechanical and technical challenges to the treatment plant. Inasmuch as responsible environmental behavior through public sensitization on proper use of pit latrines in particular and the need for their redesign to make them almost impossible for use as dumping pits for other wastes were recommended, the utilization of some of these foreign materials that have the potential to be reused like the money, memory chips or mobile phones could potentially be a source of spread for disease like cholera and diarrhea as the FS contains a lot of pathogenic bacteria.
Abstract: Faecal sludge management has been a burden for most waste managers particularly in developing countries; yet a sure way of preventing the continuous disposal of this waste into drains, bushes water bodies and the environs in general has been by treatment. The introduction of a new treatment plant with the UASB technology in the management process o...
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Experiment Investigation on a Solar Asisted Heat Pump Dryer for Chili
Bùi Quang Huy,
Lê Minh Nhựt
Issue:
Volume 3, Issue 1, January 2018
Pages:
37-44
Received:
9 March 2018
Accepted:
24 March 2018
Published:
12 April 2018
Abstract: The aim of this research is to evaluate the performance of solar assisted heat pump dryer for chilli. The experiments were carried out on three types different of days such as clear day, intermittent cloud sky day and overcast sky day. The experimental results show that the useful heat gain of solar collectors for drying chili of the clear day, intermittent cloud sky day and overcast sky day are 14.5 kWh; 8.91 kWh and 0 kWh, respectively, and the corresponding energy consumptions of solar- assisted heat pump dryer are 19.2 kWh, 21.4 kWh and 26.1 kWh, respectively. The coefficients of performance (COP) in the three cases are 3.45, 3.46, and 3.51, respectively.
Abstract: The aim of this research is to evaluate the performance of solar assisted heat pump dryer for chilli. The experiments were carried out on three types different of days such as clear day, intermittent cloud sky day and overcast sky day. The experimental results show that the useful heat gain of solar collectors for drying chili of the clear day, int...
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