小型バイナリー発電システム用コンパクト熱交換器における低質量流束沸騰熱伝達

抄録

Boiling heat transfer characteristics of different working fluids have been investigated for application to small-scale binary cycle systems. Using a plate-type evaporator with oblique wavy walls, boiling heat transfer coefficients are measured with the vapor quality at the inlet and outlet being 0 and 1, respectively. It is found that, unlike in a circular tube, the average heat transfer coefficient in the present evaporator exhibits pronounced mass flux sensitivity, implying enhanced forced convective boiling due to the oblique wavy walls. It is also found that HFO-1224yd(Z) shows higher boiling heat transfer than HFC-245fa, which is the conventional working fluid for small-scale binary cycle systems.