Abstract
This experiment is one of basic boiling heat transfer research concerning a solar-powered absorption-type chiller. A heat transfer tube, which was surrounded by a porous, polyurethane, heat-insulating layer of different porosity-size and different radial thichness, was tested under atmospheric and reduced pressure conditions and the saturated boiling heat transfer characteristics were determined. Obtained experimental data for the porous tubes indicates that the minimum incipient boiling heat flux is reduced to the order of one of twentieth and the boiling heat transfer coefficients are improved to the order of several times (2 to 5 times) that of a conventional submerged heater boiling case under the same experimental conditions.
