抄録
It is quite common now to exploit the waste heat from heat engines and other energy conversion devices, in keeping with the need to make more efficient use of energy. However, it is impossible to ensure that a sufficient quantity of waste heat will be available at the time when it is needed. Therefore, it is necessary to identify a method of temperature control that maintains the object to be heated within the appropriate temperature range, and this must be provided by a control system independent of the source of the waste heat. A method of controlling heat transfer to control temperature during waste heat recovery has been conceived that employs bubbling to force convection currents, and was confirmed in an experiment with a model that employed water as the heat transfer medium. It was first confirmed that the heat transfer coefficient varied according to the bubbling; it was then demonstrated that it was possible to control temperature by activating and deactivating bubbling. This was shown by employing a simple air pump designed for aquariums. This technique shows promise for use in small-scale bioreactors and other devices.
