For a high-quality, legal alternative, you might consider Thermal Engineering - I , a full textbook published by the (All India Council for Technical Education) in 2023, which covers many of the same fundamental concepts and is available for free. DI04019011 - GUJARAT TECHNOLOGICAL UNIVERSITY
Unfortunately, I couldn't find a direct PDF download link for "Thermal Engineering" by PL Ballaney. However, you can try the following options: thermal engineering pl ballaney pdf download link
: Early editions spanned over 1,400 pages, covering nearly all aspects of thermal systems and heat engine cycles. For a high-quality, legal alternative, you might consider
Known for making complex thermal cycles easy to visualize. Known for making complex thermal cycles easy to visualize
If you are looking for specific chapters or basic concepts without needing the full textbook immediately, these institutional resources offer free, legal access to similar course materials: Thermal Engineering - Zeal Polytechnic Pune