KMITL

Permanent URI for this communityhttps://dspace.kmitl.ac.th/handle/123456789/1

Browse

Settings

Access type: UnknownAuthor: search.filters.author.Permchart, W.

Search Results

Now showing 1 - 5 of 5
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Preliminary investigation on combustion characteristics of rice husk in FBC
    (2009-08-01)
    Permchart, W.
    ;
    Tanatvanit, S.
    The experimental results on combustion of rice husk in a conical fluidized bed combustor (referred to as the conical FBC) using silica sand as the bed material are presented in this paper. The effects of excess combustion air and combustor loading as well as the sand bed height on the combustion pattern in FBC were investigated. Temperatures and gas concentrations (CO and NO) along over the combustor height as well as in the flue gas downstream from the ash collecting cyclone were measured. The results showed that the axial temperature profiles in FBC were explicitly affected by the combustor loading whereas the excess air and bed height were found to have minor influences on the temperature pattern. Meanwhile, the combustor loading and the excess air significantly affected the axial CO and NO concentration profiles; however, these profiles were almost independent of the bed height. The combustion and thermal efficiencies for this FBC were quantified for different operating conditions.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Study on using the ground as a heat sink for a 12,000-Btu/h modified air conditioner
    (2009-03-01)
    Permchart, W.
    ;
    Tanatvanit, S.
    This paper presents the results of the experimental tests of the cooling performance of a 12,000-Btu/h modified air conditioner (referred to as M-AC) that use the ground as a heat sink of a condenser. In the tests, cooling capacity of M-AC with an optimal length of a condensing coil as well as life expectancy of copper coil buried underground were investigated. The lengths of copper coil fabricated and used as condenser coil of M-AC were set at 67, 50, 40 and 30 m whereas that of a 12,000-Btu/h conventional split-type air conditioner (referred to as C-AC) was about 22 m. The results showed that the ground can absorb heat rejected from a condenser of M-AC. The coefficient of performance (COP) of C-AC was about 2.5 whereas those of M-AC were found to be higher. It was found that the values of COP of M-AC with condensing coils of 67, 50 and 40 m long were about 6.9, 5.5 and 3.3, respectively, while that of 30-m-long one was found to be about 2.1. The electrical consumptions of M-AC were found lower than that of C-AC in the range of 11.5 - 15.5%. Additionally, life expectancy of underground condensing coil of M-AC was found to be over 7 years. © 2009 WASET.ORG.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Utilisation of used palm oil as an alternative fuel in Thailand
    (2007-01-01)
    Permchart, W.
    ;
    Tanatvanit, S.
    This paper summarises the overview of the current situation of alternative energies in Thailand. The utilisation of bio-diesel as an alternative energy in two economic sectors (i.e. transport and industrial sectors), which have the largest energy consumption in the country, is mainly presented because it has seemed to be the most promising project among various energy conservation projects of the Thai government. Actually, there is another bio-fuel project, namely, the ethanol project for blending with gasoline to produce gasohol (E10) used in gasoline engines, which has been developed and already become to an important policy for energy conservation of the country. Due to much more large number of diesel has been utilised, the bio-diesel project has been the first priority one to solve the petroleum crisis problems. However, it is remarked that the utilisation of bio-diesel as an alternative fuel seems to be unsatisfactory because of various reasons. Some issues in terms of both government policies and technical problems have not been clearly addressed. Therefore, this paper not only presents the utilisation of bio-diesel in these two sectors but also discusses the production processes, characterisations and some experimental testing results of bio-diesel. © 2007 American Institute of Physics.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Co-firing of sugar cane bagasse with rice husk in a conical fluidized-bed combustor
    (2006-03-01)
    Kuprianov, V. I.
    ;
    Janvijitsakul, K.
    ;
    Permchart, W.
    This paper presents experimental results on co-firing of 'as-received' sugar cane bagasse and rice husk in a conical fluidized-bed combustor (FBC) using silica sand as the bed material. Axial temperature, O<inf>2</inf>, CO <inf>2</inf>, CO and NO concentration profiles in the conical FBC operated at 82.5-82.8 kg/h fuel feed rate and various values of excess air (of about 40, 60, 80 and 100%) for different rice husk energy fractions (of 0.60, 0.85 and 1.0) are discussed. The bed temperature, CO and NO emissions from the combustor, as well as the heat losses and combustion efficiency, are also provided for the above operating conditions. The axial temperature profiles in the conical FBC were almost independent of excess air but noticeably affected by the rice husk energy fraction. The CO emissions were found to reduce for higher values of excess air and rice husk energy fractions. Meanwhile, the NO concentrations at all the points over the combustor volume and, accordingly, NO emissions from the reactor increased with higher excess air and energy contributions by rice husk. The co-firing of these fuels in the conical FBC at the rice husk energy fractions greater than 0.6 resulted in the sustainable combustion, with 95-96% combustion efficiency, and lower NO emissions compared with those for firing pure rice husk. Through co-firing with rice husk, an effective use of 'as-received' sugar cane bagasse becomes feasible for energy conversion in the fluidized-bed combustion systems. © 2005 Elsevier Ltd. All rights reserved.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Emissions from a conical fluidized bed combustor firing various biomass fuels
    (2003-01-01)
    Permchart, W.
    ;
    Permchart, W.
    ;
    Kouprianov, V. I.
    This paper presents the results of an experimental study of biomass combustion in a conical fluidized bed combustor (conical FBC) using silica sand as the inert bed material. Three biomass fuels (sawdust, rice husk and pre-dried sugar cane bagasse) were fired with the aim of determining combustion efficiency. Effects of operating variables (load and excess air) on axial temperature and gas (CO and NO) concentration profiles as well as on CO and NO emissions from the conical FBC were also the focus of study. Both CO and NO axial profiles were found to have a maximum whose location divides conventionally the combustor volume into formation (lower) and reduction (upper) regions for these pollutants. The excess air values of 50-60% ensure minimized CO and NO emissions from the conical FBC fired with these biomass fuels. The combustion efficiencies greater than 99% for firing sawdust and bagasse, and of about 86% for firing rice husk, were achieved in the experimental tests on this combustor. © 2003, JAPAN MACRO-ENGINEERS SOCIETY. All rights reserved.