Formula Used
The aperture area is collector count multiplied by width and length. Solar input equals direct normal irradiance multiplied by total aperture area.
Absorbed power equals solar input multiplied by optical efficiency, incident angle modifier, and cleanliness factor.
Thermal loss equals heat loss coefficient multiplied by aperture area and average temperature difference. Useful output equals absorbed power minus thermal loss.
The outlet temperature rise equals useful power divided by mass flow and specific heat. Concentration ratio is aperture width divided by receiver circumference.
Pressure drop uses the Darcy relation. The tool estimates Reynolds number, flow type, friction factor, pump power, daily energy, annual energy, savings, and payback.
How To Use This Calculator
Enter the collector geometry from the supplier listing. Use aperture dimensions, not shipping frame dimensions.
Add realistic sunlight, efficiency, temperature, and flow data. Then enter cost and operation assumptions.
Press the calculate button. The result appears above the form and below the header.
Review heat output, outlet temperature, flow behavior, pressure drop, annual energy, and payback. Export the result for later comparison.
Marketplace Trough Planning
Alibaba listings often show many trough sizes. A calculator helps compare them with one method. It turns listing values into practical project numbers. It also shows where assumptions change the answer. That makes vendor review clearer.
What The Inputs Mean
A parabolic trough collects direct beam sunlight. The aperture width and length define the active opening. The optical efficiency covers mirror reflectance, glass transmission, receiver absorption, tracking error, and dirt. Thermal loss reduces useful heat. Flow rate controls the outlet temperature rise. Pump and pressure values affect operating power.
Why Output Changes
Solar output is not fixed. It changes with direct normal irradiance. It also changes with sun hours, collector alignment, receiver temperature, and local wind. A higher inlet temperature can increase heat loss. A weak flow rate can raise outlet temperature too much. That may reduce fluid stability and system safety. A very high flow rate lowers temperature rise. It can also increase pumping demand.
Use In Early Design
This page is for screening and comparison. It helps buyers estimate aperture area, concentration ratio, heat gain, outlet temperature, daily energy, and simple payback. The result is not a certified design. It is a planning guide before detailed engineering. Always confirm materials, receiver rating, pressure class, and installation rules.
Practical Buying Notes
When checking Alibaba products, compare aperture area, tracking type, receiver coating, support structure, and warranty. Ask for test data at stated irradiance. Ask whether the quoted area is aperture area or gross frame area. Check shipping, customs, spares, and local mounting needs. The cheapest collector may not produce the lowest heat cost.
Better Decisions
Use the sensitivity fields to test different sunlight levels and losses. Then compare several vendor offers under the same assumptions. Keep a record of each run. Export the results for team review. Clear inputs make solar conversations easier.
Common Mistakes To Avoid
Do not mix peak sun hours with clock hours. Use direct normal irradiance, not global horizontal radiation. Enter realistic cleanliness factors. Include pump power when comparing heat cost. For large arrays, check row spacing and service access. A compact field can suffer shading losses. Good assumptions protect budgets and timelines. Review supplier drawings before final purchase and installation work.
FAQs
1. What is a parabolic trough solar collector?
It is a curved mirror system. It focuses direct sunlight onto a receiver tube. Heat transfer fluid inside the tube carries useful thermal energy to a process, tank, boiler, or heat exchanger.
2. Can this calculator compare Alibaba supplier listings?
Yes. Enter each listing with the same sunlight, flow, and cost assumptions. This gives a fair comparison. Still ask suppliers for certified test data before buying.
3. Should I use aperture area or total frame area?
Use aperture area for solar performance. It represents the open reflective width multiplied by collector length. Frame area may include supports and gaps, so it can overstate production.
4. Why does outlet temperature change with flow rate?
Lower flow holds fluid inside the receiver longer. That usually increases temperature rise. Higher flow removes heat faster, so the outlet temperature rise becomes smaller.
5. What does concentration ratio mean?
It compares aperture width with receiver circumference. A higher ratio means sunlight is concentrated more strongly on the tube. Receiver quality and tracking accuracy then become very important.
6. Is the payback result final?
No. It is a quick planning estimate. Real payback needs local installation prices, taxes, maintenance, financing, downtime, fluid replacement, and verified solar data.
7. Why include pressure drop?
Pressure drop affects pumping power. A system with high heat gain but excessive pumping demand may cost more to operate. The flow result helps screen receiver sizing.
8. Can this replace engineering design?
No. It supports early screening only. Final projects need structural checks, thermal stress review, controls design, safety valves, pressure ratings, and local code compliance.