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Can a walkin be larger than the zone containing it?

asked 2019-06-18 13:32:46 -0500

Tilstergirl's avatar

Having some trouble with modelling walkins for a supermarket. My walkin is served by 2 evaporators, running on 2 separate transcritical systems. I'm modelling this by effectively splitting each walkin into two halves and assigning half of the total heat-loss surface area to each evaporator, along with "half" a door. I have a zone specifically for this walkin to occupy. My objects look like this:

image description

Although I have specified the zone that they occupy and the "total insulated surface area facing zone", I am getting an error to say these values are missing. Is this because the geometry doesn't add up, for example the floor area of the walkin may be larger than the floor area of the zone? Or is it having 2 walkins in one zone? Or something else? I can't find anything about walkin geometry in the Eng Guide/InputOutput. The fatal error I'm getting is:

* Severe * <root>[Refrigeration:WalkIn][ATH074_FreezerStore_201][zone_data][1] - Missing required property 'total_insulated_surface_area_facing_zone'. * Severe * <root>[Refrigeration:WalkIn][ATH074_FreezerStore_201][zone_data][1] - Missing required property 'zone_name'. * Severe * <root>[Refrigeration:WalkIn][ATH074_FreezerStore_201][zone_data][2] - Missing required property 'total_insulated_surface_area_facing_zone'.

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If you haven't solved this yet, please post a link to the full idf file, or send it to the EnergyPlus helpdesk at and reference this unmethours question.

MJWitte's avatar MJWitte  ( 2019-07-11 14:16:24 -0500 )edit

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answered 2019-07-13 12:24:33 -0500

Tilstergirl's avatar

Many thanks @MJWitte, I think that EP had pre-populated some default values into the optional object fields relating to Zones 2 and 3. Once I deleted all of the default values, the errors disappeared. So I don't think the error had anything to do with the geometry after all.

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Asked: 2019-06-18 13:32:46 -0500

Seen: 163 times

Last updated: Jul 13 '19