Study on thermoacoustic system to drive by low temperature -Effects of loop-tube thermoacoustic system connected with parallel double stacks on the onset temperature ratio

As the temperature ratio of the both ends of the stack increases gradually and reaches a critical value, sound waves begin to oscillate in the thermoacoustic system. This temperature ratio is called the onset temperature ratio. It is necessary to decrease the onset temperature ratio for practical use of the thermoacoustic system: the use of the factory exhaust heat and the solar heat. In a previous study, thermoacoustic system with series connected a number of prime movers was designed. This system can drive by lower onset temperature ratio than thermoacoustic system with a prime mover. However, it is considered that the heat loss increase when the heat is carried to a number of high heat exchangers. Therefore, loop-tube thermoacoustic system connected with parallel double stacks (parallel loop system) was proposed. This system can drive two prime movers by a heat input part because it is connected prime movers in parallel. In this report, the onset temperature ratio of this system was compared with that ...