Greeting
I would appreciate you if you help me to find the answer of this question:
however ambient air is cooler than engine coolant but Why it is not preferred instead of engine's coolant in recovering engine waste heat by TEMs (Thermoelectric materials ).
Dear Sepehr
The question is not clear but typically, water/ethylene glycol is used because water has a specific heat capacity of 4200 Jkg-1K-1 while it is 993 Jkg-1K-1 for air. Thus, water has 4.23 times more specific heat capacity. Also, water density is 784 times the air density. for WHR, fluids/nanofluids are prefered for efficient heat transfer.
Regards,
The coolant can either keep its phase and stay liquid or gaseous or can undergo a phase transition, with the latent heat adding to the cooling efficiency. The latter, when used to achieve below-ambient temperature, is more commonly known as refrigerant.
Water is the most common coolant. Its high heat capacity and low cost make it a suitable heat-transfer medium. It is usually used with additives, like corrosion inhibitors and antifreeze.
Liquid cooling is the best way to cool a machine because water transfers heat much more efficiently than air.
Agree with Mohamed S. Mahmoud and Mohammad Yusuf
Water is more efficient in removing heat due to its high specific heat capacity compared to air.
Air has lower heat capacity and would therefore require larger surface area for effective heat removal.
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