Using Dialux for Solar street light lighting calculation

Solar street light dialux lighting calculation

1. Preliminary Preparation

• Collect Site Data: This includes road width, length, number of lanes, sidewalk width, surface material, etc.
• Determine Lighting Standards: Based on the “Urban Road Lighting Design Standards” (CJJ45-2015), EN 13201 standards, IEC standards, etc., determine the average illuminance and uniformity requirements for motorways and sidewalks.
• Obtain Fixture Data: Acquire light distribution files in formats such as IES, CIB, ULD, LDT from the fixture supplier.

2. Create Road Model

• Open DIALux Software: Launch the DIALux software and enter the main interface.
• Select Road Lighting Module: Choose the “Road Lighting” module in the software.
• Insert Standard Street: Insert a standard street model and add lanes and sidewalks. Set the widths of lanes, sidewalks, and median strips according to the site data.

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3. Set Road Parameters

Select Lighting Standards:

Choose the appropriate lighting level based on the “Urban Road Lighting Design Standards” (CJJ45-2015).

• Highway CE1 class (average illuminance 30 lx, minimum uniformity 0.4)
• Motor Vehicle Lane: CE2 class (average illuminance 20 lx, minimum uniformity 0.4)
• Pedestrian Walkway: CE5 class (average illuminance 7.5 lx, minimum uniformity 0.4)

More Lighting Design Standards:Solar street lights lux level standard. What lux level do I need?

Input Road Material Reflection Coefficient: Choose appropriate reflection coefficients based on surface materials (e.g., asphalt, cement).

• For asphalt surface, the reflection coefficient is 0.2;
• For cement surface, the reflection coefficient is 0.3.

4. Import Fixture Data

• Select Fixtures: Choose suitable fixtures from the IES, CIB, ULD, and LDT files provided by the supplier.For example, select 120 W solar street lights and 125W LED Street Light.

120 W solar street lights

125W LED STREET LIGHT – EAGLE GEN4 SERIES

• Set Fixture Parameters: Enter light flux, power, and other technical parameters in the “Fixture” properties page. Choose the fixture’s light distribution curve to ensure it meets design requirements.

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5. Arrange Fixtures

• Select Fixture Layout Method: Choose an appropriate layout method based on road characteristics, such as single-sided, double-sided symmetric, or double-sided staggered arrangements.For example, choose double-sided symmetric layout with two heads installed per pole.

(a)One-side Arrangement
(b) Staggered Position
(c) Both Sides
(d) Median or Centere
(e) Catenary Arrangement

• Input Fixture Layout Parameters: Enter pole height, spacing, tilt angles, etc., in the “Poles/Arms” properties page.For example, pole height 12 meters, spacing 30 meters, arm tilt 10°, cantilever length 2.5 meters.
• Set Fixture Arrangement: Select the fixture arrangement method in the “Arrangement” properties page and adjust related parameters, such as the distance between poles and fixtures, and longitudinal displacement.For example, ensure fixtures are evenly distributed on both sides of the road with a chosen double-sided symmetric layout.

6. Perform Simulation Calculations

• Start Simulation Calculation: Click the “Calculate” button, and DIALux will automatically perform the simulation calculation.
• View Simulation Results: Check the calculation results in the “Reports” section, including average illuminance, minimum uniformity, 3D renderings, pseudocolor representations, and isopleth maps.For example, simulation results may show the motorway’s average illuminance is 34 lx, with a minimum uniformity of 0.55; the sidewalk’s average illuminance may be 17 lx with a minimum uniformity of 0.45, all compliant with the lighting standard requirements.

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7. Optimize Design Plan

• Analyze Simulation Results: If certain parameters do not meet standards, optimize by adjusting the power, height, spacing, etc., of the fixtures.For example, if the motorway’s average illuminance is below 20 lx, consider increasing the fixture power to 150 W or reducing the pole spacing to 25 meters.
• Re-Simulate: Re-run the simulation calculation after optimization until all parameters meet standard requirements.

8. Generate Calculation Reports

• Generate Reports: In the “Reports” section, generate detailed calculation reports, including planned data tables, lighting fixture lists, measurement results, and 3D renderings.
• Select Language: The software supports reports in multiple languages; choose the appropriate language based on project requirements.For example, select an English report for international design teams to read and understand.

Case Analysis

1. Project Background

• Target Segment: Width 16 meters, two-way four lanes, length 1 kilometer.
• Lighting Standards:
  • Motorway: Average illuminance 20 lx, minimum uniformity 0.4
  • Sidewalk: Average illuminance 7.5 lx, minimum uniformity 0.4
• Fixture Selection:
  • 120W Solar Street Light
  • 125W LED Street Light

2. Modeling Steps

• Create Road Model: Insert a standard street model, setting the lane width to 16 meters, and sidewalk width to 3 meters.
• Select Lighting Standards:
  • Motorway: choose EN 13201 V2 level; Sidewalk: choose EN 13201 P2 level.
• Input Road Material Reflection Coefficient:
  • Motorway: choose asphalt surface with a reflection coefficient of 0.2;
  • Sidewalk: choose cement surface with a reflection coefficient of 0.3.

3. Import Fixture Data

• Select Fixtures: Import the IES files for the 120 W solar street light and the 125 W round explosion-proof induction light.
• Set Fixture Parameters:
  • 120 W LED fixture luminous flux 11,820 lm, luminous efficacy 114.6 lm/W
  • 125 W induction light luminous flux 12,196 lm, luminous efficacy 127 lm/W

4. Arrange Fixtures

• Select Fixture Layout Method: Choose a double-sided symmetric layout, with two heads installed per pole.
• Input Fixture Layout Parameters: Pole height 12 meters, spacing 30 meters, arm tilt 10°, cantilever length 2.5 meters.
• Set Fixture Arrangement: Choose the arrangement method in the “Arrangement” properties page and adjust parameters to ensure even distribution of fixtures on both sides of the road.

5. Simulation Calculation

• Start Simulation: Click the “Calculate” button, and DIALux performs the simulation calculation.
• View Results:The simulation results show that the average illumination of the motorway is 34 lx and the minimum uniformity is 0.55. The average illumination of the walkway is 17 lx and the minimum uniformity is 0.45, which meets the requirements of EN 13201.

6. Optimize Design Plan

• Analyze Simulation Results: If some parameters do not meet standards, optimize by adjusting the power, height, spacing, etc., of the fixtures.For example, if the motorway’s average illuminance is below 20 lx, consider increasing the fixture power to 150 W or reducing the pole spacing to 25 meters.
• Re-Simulate: Re-run the simulation calculation after optimization until all parameters meet standard requirements.

7. Generate Calculation Reports

• Generate Reports: In the “Reports” section, generate detailed calculation reports, including planned data tables, lighting fixture lists, measurement results, and 3D renderings.
• Select Language: The software supports reports in multiple languages; choose the appropriate language based on project requirements.For example, select an English report for international design teams to read and understand.

Energy Saving Effect Assessment

1. Calculate Annual Electricity Consumption

• Formula:

  Total Annual Electricity = Daily Total Electricity × 365

• Example: Assuming usage of 6 hours per day, annually 365 days, annual electricity consumption for a 120 W LED fixture:

  Total Annual Electricity = 120 W × 6 hours × 365 days = 262,800 Wh = 262.8 kWh

2. Calculate Electricity Savings

• Formula:

  Electricity Savings = Original Plan Annual Electricity - Optimized Plan Annual Electricity

• Example: If original plan annual electricity consumption is 300 kWh, and optimized plan is 262.8 kWh, electricity savings would be:

  Electricity Savings = 300 kWh - 262.8 kWh = 37.2 kWh

3. Calculate Annual Standard Coal Savings

• Formula:

  Annual Standard Coal Savings = Electricity Savings / (3.6 × 10^6 J/kWh × 0.35 kg coal/kWh)

• Example: Annual standard coal savings would be:

  Annual Standard Coal Savings = 37.2 kWh / (3.6 × 10^6 J/kWh × 0.35 kg coal/kWh) = 0.0295 tons

Conclusion

Using DIALux software for solar street light illumination calculations can significantly enhance the accuracy and efficiency of design. By carefully selecting fixtures, arrangement methods, and adjusting parameters, designers can ensure lighting solutions meet the requirements of China, Europe, and international standards while achieving energy savings. The 3D simulation effects and detailed calculation reports provided by DIALux facilitate better understanding and optimization of lighting plans. Additionally, understanding and referencing the standards of different countries and regions ensures designs have high compatibility and applicability globally.

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