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

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Regular ice provides a larger total BTU cooling effect compared to dry ice when both are used to reach a temperature of 25 degrees C. One pound of ice starting at -3 degrees C can absorb significant heat as it melts and warms up, while one pound of dry ice starting at -80 degrees C has a lower heat capacity as a gas. The heat of fusion and specific heat capacity are critical factors in determining the total energy absorbed. Although dry ice is colder initially, its efficiency diminishes due to the lower heat capacity of CO2 gas. Therefore, regular ice is more effective for cooling in this scenario.
bguthire
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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
 
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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.
 
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