Heating up water- energy required

In summary, the conversation discusses the calculation of electrical power and energy for heating, as well as the specific heat of water and the potential temperature increase achievable with the given input energy. The conversation also delves into designing a waste heat recovery system for a 4 ton air conditioning unit to heat water for bathing purposes in a hostel. The speaker also asks for suggestions on where to find information on designing a heat recovery system.
  • #1
vikmak
4
0
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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  • #2
yes!
 
  • #3
grzz said:
yes!

Thanks!
 
  • #4
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.
 
  • #5
can anybody tell me where to look in for information on design related to heat recovery system?
 

FAQ: Heating up water- energy required

How does heat energy affect the temperature of water?

Heat energy is transferred to the water molecules, causing them to move faster and increase in temperature. The more heat energy that is added, the higher the temperature of the water will be.

How is the amount of energy required to heat up water calculated?

The energy required to heat up water can be calculated using the equation Q = mcΔT, where Q is the energy required, m is the mass of water being heated, c is the specific heat capacity of water, and ΔT is the change in temperature.

3. Why does it take longer to heat up larger volumes of water?

Since heat energy is being transferred to each individual water molecule, it takes longer to heat up larger volumes of water because there are more molecules that need to be heated.

4. Is the type of container used for heating up water important?

Yes, the type of container used can affect the rate at which water heats up. Materials with high thermal conductivity, such as metal, will transfer heat more efficiently and heat up water faster.

5. Can water be heated beyond its boiling point?

No, water cannot be heated beyond its boiling point without changing its state from liquid to gas. The boiling point of water is 100°C (212°F) at sea level, and any additional heat energy will cause the water to evaporate into steam.

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