Reference Inputs |  |  |  |

| To view the Trough System Costs page, click Reference Inputs on the main window's navigation menu. Note that for the trough input pages to be available, the technology option in the Technology and Market window must be Concentrating Solar Power - Dish Stirling System.

Solar Advisor uses the reference condition parameters in an iterative process to calculate the total collector error for a given set of values for the aperture diameter, focal length, and collector diameter. Once the collector error is calculated, that value can be used to calculate a new intercept factor for different aperture diameters (See Fraser, p 150-151).

Input Variable Reference

Collector Reference Condition Inputs
Variable | Description | Units
Intercept Factor | Fraction of energy reflected from the parabolic mirror that enters the receiver aperture. The intercept factor can be increased by increasing the concentration ratio or by increasing the size of the aperture. Intercept factors typically range between 0.94 and 0.99. | --
Focal Length of Mirror | Parabolic mirror focal length. | m

Receiver Reference Condition Inputs
Variable | Description | Units
Intercept Factor | Fraction of energy reflected from the parabolic mirror that enters the receiver aperture. The intercept factor can be increased by increasing the concentration ratio or by increasing the size of the aperture. Intercept factors typically range between 0.94 and 0.99. | --
Focal Length of Mirror | Parabolic mirror focal length. | m

Parasitic Variable Reference Conditions The reference condition parameters given in the table below and as user inputs in Solar Advisor are used in the pump law calculations that are part of the parasitic loss equations.
Variable | SES | WGA | SBP | SAIC
Pump Parasitic Power | 150 | 100 | 175 | 300
Pump Speed (rpm) | 1800 | 1800 | 1800 | 1800
Cooling Fluid Type | 50% EG | 50% EG | water | 50% EG
Cooling Fluid Temperature (K) | 288 | 288 | 288 | 288
Cooling Fluid Volumetric Flow Rate (gal/min) | 9 | 7.5 | 7.5 | 12
Cooling System Fan Test Power (W) | 1000 | 410 | 510 | 2500
Cooling System Fan Test Speed (rpm) | 890 | 890 | 890 | 850
Fan Air Density (kg/m3) | 1.2 | 1.2 | 1.2 | 1.2
Fan Volumetric Flow Rate (CFM) | 6000 | 4000 | 4500 | 10000