A12 Development of New Type External Combustion Engine : The present state

KAIHO Engine is a new external combustion engine having following features; (1) Can use solid disposal biomass as the fuel directly, and all combustion gas generated can be used for heating the working gas(N_2), (2)Is consisted of pressure difference generator(PDG), power piston(PP), heater, regenerator, cooler, separated each other, connected by pipes. (3) The size of the heater, regenerator, cooler are not restricted. The operating principle of this engine is that PDG generates output and pressure difference between the heater and the cooler simultaneously. The pressure difference generated drives the power piston. The experiment was performed to prove the validity of the principle and to grasp the output performance of the engine. The former was proved, but the output was remained at 2kW, not able to reach the goal of 20kW. The reason the output remained short was found to be the shortage of the performances of the valve system as was reported at the last meeting. A new valve system was proposed and tested for the good results. A utility model of the valve system is under construction. Also, a new feature for the engine was proposed.