Heating up water- energy required

AI Thread Summary
The calculations indicate that with an input power of 4KW over 20 hours, a total energy of 288,000,000 J can heat 7,500 kg of water, achieving a temperature increase of 9.14°C. The discussion shifts to designing a waste heat recovery system for heating water using heat from an air-cooled condenser of a 4-ton air conditioning unit that operates continuously for 24 hours. The goal is to utilize this system to provide hot water for bathing in a hostel. Participants are seeking resources and guidance on the design and implementation of such heat recovery systems. Effective heat recovery can significantly enhance energy efficiency in this context.
vikmak
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Is the below calc right?

Input electrical power for heating- 4KW
Heating time= 20 hrs = 72,000 sec
Input energy available= = 288,000,000 J

Qty of water to be heated- 7,500Kg
Specific heat of water- 4,200 joules/Kg/deg C

Delta T in Celsius that can be achieved with the said input energy is 9.14 ?
 
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yes!
 
grzz said:
yes!

Thanks!
 
Now the bigger question. How do you design a waste heat recovery system to heat water from the heat out of air cooled condenser of a 4 ton air conditioning unit. This 4 ton air conditioning unit runs for 24 hrs. Hot water is required for bathing purposes in a hostel.
 
can anybody tell me where to look in for information on design related to heat recovery system?
 

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