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Hello,

I am new to modeling refrigeration systems in Open Studio. I believe I have the basics down for modeling simple systems, but I wanted to know if there a way to model variable speed compressors in Open Studio? A basic walk-in refrigeration system is outlined below. I have attached performance curves for a variable speed compressor from the Danfoss software CoolSelector2. Would you have any advice on how to model a variable speed compressor with the provided performance curves? Figure 2 shows performance curves based on different frequency or compressor speeds while the polynomial in the Figure 3 tab has 30 coefficients, which looks to account for compressor speed in the equation. OpenStudio utilizes the bi-cubic curve for compressor performance so the curve in Figure 3 can’t be entered into OpenStudio. Figure 1: Basic Walk-In Cooler System Open Studio C:\fakepath\Basic Walk-In Refrigeration System OpenStudio.png Figure 2: Variable Speed Compressor Capacity Curves C:\fakepath\CoolSelector2 Capacity Curve.png Figure 3: Variable Speed Compressor Capacity Curves with Speed Variable C:\fakepath\CoolSelector2 Capacity Curve with speed.png

Hello,

I am new to modeling refrigeration systems in Open Studio. I believe I have the basics down for modeling simple systems, but I wanted to know if there a way to model variable speed compressors in Open Studio? A basic walk-in refrigeration system is outlined below. I have attached performance curves for a variable speed compressor from the Danfoss software CoolSelector2. Would you have any advice on how to model a variable speed compressor with the provided performance curves? Figure 2 shows performance curves based on different frequency or compressor speeds while the polynomial in the Figure 3 tab has 30 coefficients, which looks to account for compressor speed in the equation. OpenStudio utilizes the bi-cubic curve for compressor performance so the curve in Figure 3 can’t be entered into OpenStudio. Figure 1: Basic Walk-In Cooler System Open Studio C:\fakepath\Basic Walk-In Refrigeration System OpenStudio.png Figure 2: Variable Speed Compressor Capacity Curves C:\fakepath\CoolSelector2 Capacity Curve.png Figure 3: Variable Speed Compressor Capacity Curves with Speed Variable C:\fakepath\CoolSelector2 Capacity Curve with speed.png

Hello,

I am new to modeling refrigeration systems in Open Studio. I believe I have the basics down for modeling simple systems, but I wanted to know if there a way to model variable speed compressors in Open Studio?

A basic walk-in refrigeration system is outlined below. I have attached performance curves for a variable speed compressor from the Danfoss software CoolSelector2. Would you have any advice on how to model a variable speed compressor with the provided performance curves?

Figure 1: Basic Walk-In Cooler System Open Studio

Figure 2 shows performance curves based on different frequency or compressor speeds while the polynomial in the Figure 3 tab has 30 coefficients, which looks to account for compressor speed in the equation. OpenStudio utilizes the bi-cubic curve for compressor performance so the curve in Figure 3 can’t be entered into OpenStudio. Figure 1: Basic Walk-In Cooler System Open Studio C:\fakepath\Basic Walk-In Refrigeration System OpenStudio.pngOpenStudio.

Figure 2: Variable Speed Compressor Capacity Curves C:\fakepath\CoolSelector2 Capacity Curve.pngCurves

Figure 3: Variable Speed Compressor Capacity Curves with Speed Variable C:\fakepath\CoolSelector2 Capacity Curve with speed.pngVariable

Hello,

I am new to modeling refrigeration systems in Open Studio. I believe I have the basics down for modeling simple systems, but I wanted to know if there a way to model variable speed compressors in Open Studio?

A basic walk-in refrigeration system is outlined below. I have attached performance curves for a variable speed compressor from the Danfoss software CoolSelector2. Would you have any advice on how to model a variable speed compressor with the provided performance curves?

Figure 1: Basic Walk-In Cooler System Open Studio

Figure 2 shows performance curves based on different frequency or compressor speeds while the polynomial in the Figure 3 tab has 30 coefficients, which looks to account for compressor speed in the equation. OpenStudio utilizes the bi-cubic curve for compressor performance so the curve in Figure 3 can’t be entered into OpenStudio.

Figure 2: Variable Speed Compressor Capacity Curves

Figure 3: Variable Speed Compressor Capacity Curves with Speed Variable