Saga University

Yasuyuki Ikegami

Haruo Uehara

Shigeru Hoyashita

Kazuhiro Sumi

Taro Watanabe

Sadayuki Jitsuhara

Takafumi Morisaki

Shin Okamura

There is provided a steam power cycle system in which steam power cycles using pure materials as a working fluid is used in a multiple stage to reduce pressure loss in the flow channels in the respective heat exchanger so that the fluid serving as heat sources has been caused to make an effective heat exchange with the working fluid. More specifically, not only that the respective flow channels for the fluid serving as heat sources in the evaporator and the condenser in the respective steam power cycle units are connected in series to each other, but the evaporator and the condenser comprise a cross-flow type heat exchanger and are arranged respectively in a flowing direction of the fluid serving as heat source. Consequently, it is possible to reduce the length of the flow channels to the minimum necessary, simplify the flow channel structure, and reduce the pressure loss.

Steam power cycle system

There is provided a steam power cycle system that permits to perform an appropriate heat exchange between a working fluid that is a non-azeotropic mixture and a heat source, to enhance the performance of the whole system. More specifically, a plurality of condensers are provided so as to be connected to each other in series, and the working fluid in a gas phase from the expander is introduced into the respective condensers. Consequently, the ratio of a low boiling point substance of the working fluid becomes higher toward the posterior condenser, it is possible to make the condensation temperature of the working fluid lower than that of the anterior condenser. It is therefore possible to make the temperature of the working fluid possibly close to the temperature of the low-temperature fluid, thus permitting an effective use of the difference in temperature of the heat source.

A learning system including a server and a user terminal is provided for providing a lecture to a user and for evaluating the user. The present systems has the server and the user terminal, the server has a storage unit for storing at least one educational material and a transmitting unit for transmitting said educational material to the user terminal, the user terminal has a receiving unit for receiving said educational material from the server; display unit for presenting the received educational material to a user; a recognizing unit for recognizing movement of the user; and a transmitting unit for transmitting said recognized movement, wherein the server further has a receiving unit for receiving the movement from the user terminal; and an evaluating part for evaluating learning behavior of the user based on the movement.

Learning system

A system for producing an educational material for students. The system has a storing part for storing raw educational materials into a database, an input part for inputting both student-related data and educational environment-related data, and an educational material producing unit for selecting at least one raw educational material from said the database based on predetermined selecting criteria and the inputted student-related data and educational environment-related data to produce educational material from the selected at least one raw educational material.

System and method for producing educational material

The present invention relates to an energy converter for transferring thermal energy from a low heat source to a high heat source using a mixed medium for the purposes of increasing thermal energy transfer efficiency. The present invention improves performance of an evaporator and a condenser, reduces production cost of the device, improves performance over a wide range even with partial loads, and provides a highly efficient and polyfunctional energy converter having function as a refrigerator and a heat pump with one cycle, and function as a generator. The present invention relates to an energy converter including an evaporator for heat-exchanging a low heat source for a working fluid, a compressor connected to a fluid discharge side of the evaporator for compressing a discharge fluid, a condenser connected to a discharge side of the compressor for thermally exchanging the working fluid discharged from the compressor with a high heat source, a vapor-liquid separator connected to a discharge side of the condenser, a swelling device connected to a vapor discharge side of the vapor-liquid separator for swelling a discharged vapor, a reducing valve connected to a liquid discharge side of the vapor-liquid separator for reducing a liquid, a mixer for mixing a swollen vapor from the swelling device with a reduced liquid from the reducing valve, and a heat exchange cycle formed by connected piping for evaporating a discharge fluid of the mixer or the absorber with the evaporator.

Energy converter

A thermal power generator includes a high heat source pump, and cold working fluid pumps. An evaporator heat exchanges a high heat source fluid and a warmed working fluid. A liquid-vapor separator is connected to the evaporator. A first stage turbine is connected to the liquid-vapor separator. A second stage turbine is connected to the first stage turbine. A heater is connected to the first stage turbine, and receives remaining vapor working fluid, and the cold-working fluid to heat exchange the fluids. A tank stores and mixes the working fluids discharged from the heater, and supplies the stored working fluid to the first cold working fluid pump. A regenerator receives the liquid working fluid from the separator, and the cold working fluid, and forms a regenerated working fluid, and a warmed working fluid discharged to the evaporator. An absorber is connected to the second stage turbine and the regenerator. A reducing valve is located between the absorber and regenerator. A low heat source pump supplies a low heat source fluid to a main condensation tank, to perform a heat exchange to recondense the vapor working fluid. An auxiliary condensation tank receives an absorbed working fluid, the recondensed working fluid, and the low heat source fluid. A storage tank is connected to the auxiliary condensation tank. The cold-working fluid is fed from the storage tank to the heater, regenerator and evaporator, respectively.

Growing community of inventors

Saga, Japan

Yasuyuki Ikegami