Ice vs. Dry Ice total BTU cooling to 25 degrees C

[bguthire]

I wanted to ask which would provide the largest total BTU cooling regular ice from water or dry ice to reach a temperature of 25 degrees C?

1 lb of Ice would start at -3 degrees C to 25 degrees C at sea level = total BTU
1 lb of Dry ice would start at -80 degrees C to 25 degrees C at sea level = total BTU

 

[mgb_phys]

You need the heat of fusion = the energy released when a mass of a solid melts
and the specific heat capacity = the energy released by deg rise in temperature once the substance has melted.

Although the CO2 is at a lower temperature the heat capacity of a gas is much lower than water.

 

[charng]

The total BTU cooling provided by regular ice from water and dry ice would depend on several factors such as the starting temperature, the amount of ice used, and the surrounding environment. However, in general, dry ice would provide a larger total BTU cooling compared to regular ice from water.

This is because dry ice has a much lower starting temperature (-80 degrees C) compared to regular ice from water (-3 degrees C). This means that dry ice has a larger temperature difference to overcome in order to reach 25 degrees C, resulting in a higher amount of energy (BTUs) being absorbed from the surrounding environment.

Additionally, dry ice undergoes a process called sublimation, where it changes directly from a solid to a gas without going through a liquid phase. This process also requires a significant amount of energy (BTUs) to be absorbed, resulting in a larger total BTU cooling compared to regular ice from water.

However, it is important to note that the total BTU cooling provided by both types of ice will also depend on the specific heat capacities of the materials and the efficiency of the cooling process. Therefore, the exact amount of total BTU cooling cannot be determined without further information and experimentation.