The Study of Total Operational Cost with Different Fuel Prices in the Cogeneration System and the Exergy Analysis of Air-Conditioner without Condensed Water

• Main Authors: Roung Shoun Chen, 陳榮舜
• Other Authors: Prof.Hong-Sen kou
• Format: Others
• Language: en_US
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/83024353324262864051

碩士 === 大同大學 === 機械工程研究所 === 89 === PART ONE :The Study of Total Operational Cost with Different Fuel Prices in the Cogeneration System The thesis deals with cogeneration system of extraction-type steam turbine generator. Under taking into account of operational cost and enthalpy for fuel, it is an interesting place that how the cost is obtained as minimum by mixing coal and oil while cogeneration system is running. Based on the real design and industrial application, the attempt of the investment is to find the I/O curve for boiler and steam turbine from output data. Furthermore, it is possible to determine the optimum values from boiler and electric power with the lowest cost for fuel, water feeding, and benefits of selling power to Taiwan Power Company. The results show that the best way to save the operational cost is to generate and sell power from the extra steam with high loading at off-peak time while the price for coal is down to 1.7 NT$/kg. Instead, while oil price is up to 4.1 NT$/kg, the optimum value of steam generation can be determined as system is mid-loading. Consequently, it is not worthy to generate and sell the extra power to Taiwan Power Company when the cost of gas is up to 9 NT$/kg in low loading. Meanwhile, in addition, GateCycle 5.2 software is used for analyzing efficiency of whole system. And the output data can be applied as reference. PART TWO : The Exergy Analysis of Air-Conditioner without Condensed Water This part of thesis focuses on the air-conditioner without condensed water. In order to save power energy, the exergy loss of air-conditioner must be reduced. Meanwhile, how to deal with the condensed water is also a puzzle. Numerous attempts have been made by scholars for many years. However, extracted water jet tool, the instrument designed for solving these problems, has never been tried. This equipment utilizes theorem of water evaporation to save energy. First, this mechanism sucks condensed water from the base of evaporator by screw liked channel, and then water is spayed out all over the hot condenser. As a result of high temperature makes the water evaporate and take the heat away. Thus, more heat can be removed; the higher EER and COP values are obtained. As expected, the exergy is also decreased. Another more efficient approach suggested in this paper is to increase the speed of rotation for fans. Experiment shows that high speed of air to condenser can also save the exergy. Finally, both of the two efficient ways will be performed in Tables and proved later.