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Hi all,

I am hoping that you will be able to not only note that I am some kind of fool, but exactly what kind of fool I am, and how to be less so! B^>

I am trying to replicate a simplified form of the initial scenario from my paper:

https://www.mdpi.com/2071-1050/16/11/4710

a single-zone square bungalow (though 4 equal-size rooms will appear inside in due course) , no floor losses, roof and walls same U-value, no windows or ventilation losses or occupants or other incidental gains. With these values and equilibrium conditions:

 IWL (Internal Wall Length) = 4m, thus whole external wall length 8m.
 IWH (Internal Wall Height) = 2.3m
 EWRU (Effective Wall and Roof U-value): 0.61 W/m2K
 Wall and roof surface: (4x18.4m2 + 64m2) 137.6m2
 Floor non-conducting
 Interior and exterior temperatures at design conditions: 21C / -3C

I calculate in the paper and by hand:

 Expected heat demand at design conditions: ~2000W

But the winter design day in the E+ model below shows ~1400W for several things in eplusout.eso, eg: ZONE ONE,Zone Predicted Sensible Load to Setpoint Heat Transfer Rate [W].

https://github.com/DamonHD/BuildingModelsForHeating/tree/main/ZonedHP/bungalow-1/20250407-snapshot

I am likely doing something very basic wrong for a 30% error!

You will see that I am a novice at E+, and that this is a work in progress, and that I may just be looking at the wrong things!

Any clues to point me in something like the right direction gratefully received!

Rgds

Damon

Hi all,

I am hoping that you will be able to not only note that I am some kind of fool, but exactly what kind of fool I am, and how to be less so! B^>

I am trying to replicate a simplified form of the initial scenario from my paper:

https://www.mdpi.com/2071-1050/16/11/4710

a single-zone square bungalow (though 4 equal-size rooms will appear inside in due course) , no floor losses, roof and walls same U-value, no windows or ventilation losses or occupants or other incidental gains. With these values and equilibrium conditions:

 IWL (Internal Wall Length) = 4m, thus whole external wall length 8m.
 IWH (Internal Wall Height) = 2.3m
 EWRU (Effective Wall and Roof U-value): 0.61 W/m2K
 Wall and roof surface: (4x18.4m2 + 64m2) 137.6m2
 Floor non-conducting
 Interior and exterior temperatures at design conditions: 21C / -3C

I calculate in the paper and by hand:

 Expected heat demand at design conditions: ~2000W

But the winter design day in the E+ model below shows ~1400W for several things in eplusout.eso, eg: ZONE ONE,Zone Predicted Sensible Load to Setpoint Heat Transfer Rate [W].

https://github.com/DamonHD/BuildingModelsForHeating/tree/main/ZonedHP/bungalow-1/20250407-snapshot

I am likely doing something very basic wrong for a 30% error!

You will see that I am a novice at E+, and that this is a work in progress, and that I may just be looking at the wrong things!

Any clues to point me in something like the right direction gratefully received!

Rgds

Damon

Hi all,

I am hoping that you will be able to not only note that I am some kind of fool, but exactly what kind of fool I am, and how to be less so! B^>

I am trying to replicate a simplified form of the initial scenario from my paper:

https://www.mdpi.com/2071-1050/16/11/4710

a single-zone square bungalow (though 4 equal-size rooms will appear inside in due course) , no floor losses, roof and walls same U-value, no windows or ventilation losses or occupants or other incidental gains. With these values and equilibrium conditions:

 IWL (Internal Wall Length) = 4m, thus whole external wall length 8m.
 IWH (Internal Wall Height) = 2.3m
 EWRU (Effective Wall and Roof U-value): 0.61 W/m2K
 Wall and roof surface: (4x18.4m2 + 64m2) 137.6m2
 Floor non-conducting
 Interior and exterior temperatures at design conditions: 21C / -3C

I calculate in the paper and by hand:

 Expected heat demand at design conditions: ~2000W

But the winter design day in the E+ model below shows ~1400W for several things in eplusout.eso, eg: ZONE ONE,Zone Predicted Sensible Load to Setpoint Heat Transfer Rate [W].

https://github.com/DamonHD/BuildingModelsForHeating/tree/main/ZonedHP/bungalow-1/20250407-snapshot

I am likely doing something very basic wrong for a 30% error!

You will see that I am a novice at E+, and that this is a work in progress, and that I may just be looking at the wrong things!

Any clues to point me in something like the right direction gratefully received!

Rgds

Damon

Hi all,

I am hoping that you will be able to not only note that I am some kind of fool, but exactly what kind of fool I am, and how to be less so! B^>

I am trying to replicate a simplified form of the initial scenario from my paper:

https://www.mdpi.com/2071-1050/16/11/4710

a single-zone square bungalow (though 4 equal-size rooms will appear inside in due course) , no floor losses, roof and walls same U-value, no windows or ventilation losses or occupants or other incidental gains. With these values and equilibrium conditions:

 IWL (Internal Wall Length) = 4m, thus whole external wall length 8m.
 IWH (Internal Wall Height) = 2.3m
 EWRU (Effective Wall and Roof U-value): 0.61 W/m2K
 Wall and roof surface: (4x18.4m2 + 64m2) 137.6m2
 Floor non-conducting
 Interior and exterior temperatures at design conditions: 21C / -3C

I calculate in the paper and by hand:

 Expected heat demand at design conditions: ~2000W

But the winter design day in the E+ model below shows ~1400W for several things in eplusout.eso, eg: ZONE ONE,Zone Predicted Sensible Load to Setpoint Heat Transfer Rate [W].

https://github.com/DamonHD/BuildingModelsForHeating/tree/main/ZonedHP/bungalow-1/20250407-snapshot

I am likely doing something very basic wrong for a 30% error!

You will see that I am a novice at E+, and that this is a work in progress, and that I may just be looking at the wrong things!

Any clues to point me in something like the right direction gratefully received!

Hi all,

I am hoping that you will be able to not only note that I am some kind of fool, but exactly what kind of fool I am, and how to be less so! B^>

I am trying to replicate a simplified form of the initial scenario from my paper:

https://www.mdpi.com/2071-1050/16/11/4710

a single-zone square bungalow (though 4 equal-size rooms will appear inside in due course) , no floor losses, roof and walls same U-value, no windows or ventilation losses or occupants or other incidental gains. With these values and equilibrium conditions:

 IWL (Internal Wall Length) = 4m, thus whole external wall length 8m.
 IWH (Internal Wall Height) = 2.3m
 EWRU (Effective Wall and Roof U-value): 0.61 W/m2K
 Wall and roof surface: (4x18.4m2 + 64m2) 137.6m2
 Floor non-conducting
 Interior and exterior temperatures at design conditions: 21C / -3C

I calculate in the paper and by hand:

 Expected heat demand at design conditions: ~2000W

But the winter design day in the E+ model below shows ~1400W for several things in eplusout.eso, eg: ZONE ONE,Zone Predicted Sensible Load to Setpoint Heat Transfer Rate [W].

https://github.com/DamonHD/BuildingModelsForHeating/tree/main/ZonedHP/bungalow-1/20250407-snapshot

I am likely doing something very basic wrong for a 30% error!

You will see that I am a novice at E+, and that this is a work in progress, and that I may just be looking at the wrong things!

Any clues to point me in something like the right direction gratefully received!