# Find BTU Required for Water Cooling ?

1. Aug 24, 2016

### Assim

1. The problem statement, all variables and given/known data

Calculate the BTU/hr required for water to lower its temperature to find the compressor capacity required

- Cool 30 Liters of water from 50 degree Celsius(T1) to 25 Degree Celsius(T2) – ( 122 to 77 Fahrenheit )
-Water in a closed vessel, Static, not flowing.
-Max Time Available to cool the water - 10 to 15 mins (not sure if time is relevant for finding the BTU, But it will be ideal to find the compressor which can do the job in the above time)

2. Relevant equations

Specific heat equation
Heat added = specific heat x mass x (tfinal - tinitial)

3. The attempt at a solution

Specific heat of water = 4.184
Mass = 30 litres = 30,000 grams(approx)
Tfinal - Tinitial = 25 Degree C

bit confused with the units used so I guess I am getting wrong answer
Kindly help to fix this

Thanks

2. Aug 24, 2016

### Bystander

3. Aug 24, 2016

### Staff: Mentor

1 liter = 1kg = 2.205 lbm

1 C = 1.8 F

Heat capacity of water = $1 \frac{BTU}{lbm\ F}$