1. How would ” change for a counterflow regenerator (having Cr* = 5 and C* = 1) by increasing the…

1. How would ” change for a counterflow regenerator
(having Cr* = 5 and C* = 1) by increasing the disk speed from 3 rpm to 20 rpm?

(a) less than 1% (b) about 5% (c) more than 10%

2. In a vehicular gas turbine rotary regenerator, the
terminal temperatures are: hot fluid: 7608C, 2978C; cold fluid: 2048C, 6678C.
The rotational speed is such that Cr * = 10. The effectiveness of this
regenerator is approximately:

(a) 83% (b) 75% (c) 100% (d) 64%