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Hi, for now I want to simulate boilers with different turn down ratio, but from the source code, seems like when the demand is lower than the minimum part load, EnergyPlus will operate the boiler at 20% capacity (let's say turndown ratio is 5:1) because it can't modulate to lower loads.

FuelUse = TheoreticalFuelUse/NormalisedBoilerEff

TheoreticalFuelUse = BoilerLoad/BoilerEff

is that mean the way EnergyPlus simulating boiler consumption can not achieve the cycling process when load below the turndown ratio? If it can, any advice?

Thanks

Hi, for For now I want to simulate boilers with different turn down ratio, but from the source code, seems like when the demand is lower than the minimum part load, EnergyPlus will operate the boiler at 20% capacity (let's say turndown ratio is 5:1) because it can't modulate to lower loads.

FuelUse $$FuelUse = TheoreticalFuelUse/NormalisedBoilerEffTheoreticalFuelUse/NormalisedBoilerEff$$

TheoreticalFuelUse $$TheoreticalFuelUse = BoilerLoad/BoilerEffBoilerLoad/BoilerEff $$

is that mean the way EnergyPlus simulating boiler consumption can not achieve the cycling process when load below the turndown ratio? If it can, any advice?

For now I want to simulate boilers with different turn down ratio, but from the source code, seems like when the demand is lower than the minimum part load, EnergyPlus will operate the boiler at 20% capacity (let's say turndown ratio is 5:1) because it can't modulate to lower loads.

$$FuelUse = TheoreticalFuelUse/NormalisedBoilerEff$$\frac{TheoreticalFuelUse}{NormalisedBoilerEff}$$

$$TheoreticalFuelUse = BoilerLoad/BoilerEff $$\frac{BoilerLoad}{BoilerEff}$$

is that mean the way EnergyPlus simulating boiler consumption can not achieve the cycling process when load below the turndown ratio? If it can, any advice?

For now I want to simulate boilers with different turn down ratio, but from the source code, seems like when the demand is lower than the minimum part load, EnergyPlus will operate the boiler at 20% capacity (let's say turndown ratio is 5:1) because it can't modulate to lower loads.

$$FuelUse = \frac{TheoreticalFuelUse}{NormalisedBoilerEff}$$

$$TheoreticalFuelUse = \frac{BoilerLoad}{BoilerEff}$$

is that mean the way EnergyPlus simulating boiler consumption can not achieve the cycling process when load below the turndown ratio? If it can, any advice?