ENG 1460 Chapter Notes - Chapter 5: Thermodynamic Temperature, Heat Transfer, Thermodynamics

• School: University of Manitoba
• Department: Engineering
• Course: ENG 1460
• Professor: Dr. Deng

Document Summary

First law of thermodynamics: energy is conserved during a process or cycle. The first law allows free conversion from one form of energy to another as long as the overall quantity is conserved. No restriction is placed on the conversion of work to heat, or heat to work. Experiments have shown only a portion of heat can be converted to work. This implies that work and heat are not interchangeable forms of energy. The second law of thermodynamics infers that processes by nature occur in a certain direction; energy has both quantity and quality. Work (high grade of energy) can easily be converted to heat (low grade of energy), but only a portion of heat can be converted to work. E. g. , in a heat engine only a certain portion of the heat transferred to the working fluid can be converted into work. An actual process must satisfy the first and second laws of thermodynamics.