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A ceramic gas turbine can save energy because of its high thermal efficiency at high turbine inlet temperatures. This paper deals with the thermodynamic and economic aspects of a ceramic gas turbine cogeneration system. Here cogeneration means the simultaneous production of electrical en-ergy and useful thermal energy from the same facility. The thermodynamic performance of a ceramic gas turbine cycle is assessed using a computer model. This model is used in parametric studies of performance under partial loads and at various inlet air temperatures. The computed performance is compared to the measured performance of a conventional gas turbine cycle. Then, an economic evaluation of a ceramic gas turbine cogeneration system is investigated. Energy savings provided by this system are estimated on the basis of the distributions of heat/power ratios. The computed economic evaluation is compared to the actual economic performance of a conventional system in which boilers produce the required thermal energy and electricity is purchased from a utility.
Satoru Okamoto. Energy-Saving and Economical Evaluations of a Ceramic Gas Turbine Cogeneration Plant. Open Journal of Energy Efficiency 2013, 02, 89 -96.
AMA StyleSatoru Okamoto. Energy-Saving and Economical Evaluations of a Ceramic Gas Turbine Cogeneration Plant. Open Journal of Energy Efficiency. 2013; 02 (02):89-96.
Chicago/Turabian StyleSatoru Okamoto. 2013. "Energy-Saving and Economical Evaluations of a Ceramic Gas Turbine Cogeneration Plant." Open Journal of Energy Efficiency 02, no. 02: 89-96.
This paper describes a water leak test of roof tiles. The 100 roof tiles were set up on 10 lines and 10 rows on the pitched roof in the downstream of the flow from the wind tunnel. The flow velocity was increased gradually from the low velocity to the high velocity, and the effects of the wind on the roof tiles were investigated by the water leak test. The situation of the water leak test was filmed by video camera. Two accelerometers were simultaneously used. The roof tiles which showed significant vibration at any velocity were found in a series of experiments and the accelerometers were attached to the two neighboring roof tiles on the model roof. The water leak phenomena in the experiment by using the artificial rainfall apparatus are discussed in this paper. Some mechanisms with relatively large amplitudes at low-frequency vibrations, which caused water leak phenomena were made clear.
S. Okamoto. Water Leak Tests of Tiled Roofs under Vibration and Scattering by Wind Tunnel. Earth and Space 2010 2010, 1 .
AMA StyleS. Okamoto. Water Leak Tests of Tiled Roofs under Vibration and Scattering by Wind Tunnel. Earth and Space 2010. 2010; ():1.
Chicago/Turabian StyleS. Okamoto. 2010. "Water Leak Tests of Tiled Roofs under Vibration and Scattering by Wind Tunnel." Earth and Space 2010 , no. : 1.
A series of wind tunnel tests was conducted on the vibration and scattering behavior of full-sized model of roof tiles, which were used widely for roofings of Japanese wooden dwellings. This study has investigated the nature and source of the vibrating and scattering behavior of roof tiles with the aim of providing a better insight to the mechanism. The roof tiles were set up on the pitched roof in the downstream of the flow from the wind tunnel. Based on the consideration on the results of the measurements, there is a basic mechanism which can lead to flow-induced vibrations of the roof tiles. This mechanism is similar to that of the so-called fluttering instability, which appears as the self-excited oscillation in the natural mode of the structure at the certain critical flow speed. The values of the frequencies for the oscillating relate to the values of natural frequencies of the vibration.
S. Okamoto. Effect on Tiles by Wind Flow over Roof of Japanese Residence. Earth and Space 2010 2010, 1 .
AMA StyleS. Okamoto. Effect on Tiles by Wind Flow over Roof of Japanese Residence. Earth and Space 2010. 2010; ():1.
Chicago/Turabian StyleS. Okamoto. 2010. "Effect on Tiles by Wind Flow over Roof of Japanese Residence." Earth and Space 2010 , no. : 1.
The combined production of electrical, heating and cooling energy is becoming an increasingly important technology. It has several advantages : these include a lower consumption of primary energy, reduction levels of air pollution, and less expenditure. Simultaneous production of heat, cold and power gives us higher efficiency of whole system. Depending on the conditions, these combined systems can be the most economical solution for a building. The requirement is that the system is located where there is a high consumption of electrical, heating and cooling energy throughout the year. An example of the type of consumer that has such conditions is a hospital. It can happen that in a certain period of the year this type of system is not profitable because of the relative costs of gas and electricity. For this reason it is always important to make a detailed analysis of any planned system and to look at the various possible operating regimes. To be in a position to compare a new system with an old one, we must predict the future operating regime and all the costs that are associated with it. This paper constitutes a work starting from an analysis of typical energy demand profiles in a hospital, the technical criteria to assess the feasibility of cogeneration plants are proposed. Typical results for the hospital are also presented.
Satoru Okamoto. Energy Saving in a Hospital : Assessing Economic and Technical Potential. Challenges of Power Engineering and Environment 2007, 1305 -1309.
AMA StyleSatoru Okamoto. Energy Saving in a Hospital : Assessing Economic and Technical Potential. Challenges of Power Engineering and Environment. 2007; ():1305-1309.
Chicago/Turabian StyleSatoru Okamoto. 2007. "Energy Saving in a Hospital : Assessing Economic and Technical Potential." Challenges of Power Engineering and Environment , no. : 1305-1309.