Basic problem on Heat Engine & the 2nd Law of Thermodynamics

Welcome to Engineering Hack! In today's video we are introducing some second law problems. The second law of thermodynamics notes that energy has quality in addition to having quantity. It is quite tricky at first, but pretty much it tells us that 1 Joule may be different 1 Joule, despite both being the same quantity of energy. I intend on doing a video on theory later on this to explain better using examples and analogies, but for now let's focus on problem-solving while exploring the theory. A heat engine grabs energy from a source (that we generically call a hot reservoir) to convert it into useful energy (work), but the second law tells us there is a limit to this conversion. This limit is a function of not only the heat source (hot reservoir), but also the energy sink (generically called cold reservoir or low reservoir). And the conversion efficiency has always to be less than 100% because the energy sink (cold reservoir) is necessary for a heat engine to operate. The solving of this problem is quite simple, but the logic behind it takes a lot of thinking to sink in. So please don't underestimate it, or the other problems around this basic 2nd law idea. This question is number 6.20 from the Çengel's book (Y.A. Cengel, M.A. Boles & M. Kanoglu, (2019) Thermodynamics, an engineering approach, 9th, S.I. Edition, McGraw Hill Education). Problem statement: A heat engine with a thermal efficiency of 45 percent rejects 500 kJ/kg of heat. How much heat does it receive? Answer: 909 kJ/kg 00:00 Intro 00:52 Problem statement 01:01 Analysis 03:10 Energy balance (1st law) 03:55 Finding heat received (unknown) To learn more please watch the video till end and if you have a question just ask in the comments section. If you enjoyed this video, please SUBSCRIBE and don't forget to press the bell 🔔, 👍like, comment and share. --------------------------- ▶️ Please Subscribe:    / @engineeringhack   --------------------------- ▶️Watch More Videos: • Isobaric Expansion:    • Isobaric Expansion (CO2) | Ideal Gas | The...   • Intro to Specific Volume:    • Intro to Specific Volume & Quality | Therm...   • Polytropic Compression:    • Polytropic Compression of Air | Ideal Gas ...   • Robot Arm circular motion:    • Circular Motion | Robot Arm | Dynamics   --------------------------- #thermodynamics #Engineeringuniversity #problemsolving #EngineeringHack #specificvolume #saturatedmixture #engineeringsolutions #engineeringaustralia #engineering #saturatedliquid #propertytables #steamtables #university #saturatedvapor #qualitygas #puresubstance