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Modeling an ice block naturally melting in an empty room - EnergyPlus

asked 2 years ago

Homeiramir's avatar

I want to model the Ice Box Challenge project (https://iceboxchallenge.com/) in EnergyPlus. The project features two empty rooms, one built based on local building codes and one based on Passive House standards. A one-ton block of ice is left in the middle of each room in the sun for 18 days. The amount of ice left in the rooms would help measure and compare the energy performance of a Passive House and a code-based envelope design.

For my question in EnergyPlus, it basically means I need to model a block of ice naturally melting in the middle of an empty room without any air conditioning or other heat sources present (the only heat transfer is through the walls with the outdoor air). Do you have any suggestions on how to approach this model? Or do you have any recommendations on how to model an HVAC system that would imitate the same behavior as melting ice?

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One challenge in modeling the ice, is the changing exposed surface area over time as the ice shrinks.

David Goldwasser's avatar David Goldwasser  ( 2 years ago )

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answered 2 years ago

There is no "melting ice" model in EnergyPlus. The rate of melting, remaining surface area, interation with the zone heat balance, etc. would have to be modeled independently of EnergyPlus. Meaning that the ice melting model itself would have to be modeled somehow. There is EMS in EnergyPlus that could run that model if you did have a melting ice model (equations for all aspects of melting ice).

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Asked: 2 years ago

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Last updated: Dec 02 '22