1. Explain how Hottel’ curves can help in estimating radiant heat exchange between a gas volume and an enclosure. 2. How will heat transfer be estimated when both convection and radiation are...

1. Explain how Hottel’ curves can help in estimating radiant heat exchange between a gas volume and an enclosure.

2. How will heat transfer be estimated when both convection and radiation are significant? How do you contribute to total energy transfer when the temperature is low and when the temperature is high?