In the heat-balance equation Eq. 7.2 for ice quantity, the latent heat of fusion of ice is assumed as which value?

1. The heat-balance equation tracks heat released by each ingredient as it falls to the final temperature. 2. The ice term carries three parts: heating ice from its initial temperature to 0 °C, melting it, and heating the melt water to the final temperature. 3. The unit takes the latent heat of fusion as 80 cal/g for the melting term. 4. Specific heat of ice is taken as 0.5 cal/g/°C and specific heat of water as 1 cal/g/°C. 5. So 80 cal/g is the unit's value for the latent heat of fusion. _Source: IGNOU Concrete Technology, Unit 7 "Concreting Equipment" (Mixers, Cableways, Batchers, Buckets, Pre/Post Cooling)._