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Solar Thermal Collector Thermal Efficiency (Hottel-Whillier-Bliss) Calculator

Easily calculate and compute solar thermal collector thermal efficiency (hottel-whillier-bliss) calculator with accurate equations, live formulas, and expert guidance.

Standard full sun is 800 to 1,000 W/m².

Calculated Result
67.1 % efficiency

Collector Instantaneous Efficiency

Collector Instantaneous Efficiency

67.1 % efficiency

Thermal Efficiency Percent

67.1

Heat Output Watts Per M2

537

Fluid Temperature Lift Delta C

25

67.1 — % efficiency

Calculation Breakdown

  1. Applied FormulaUses the ASHRAE / European EN 12975 Hottel-Whillier-Bliss equation to calculate glazed solar water heating collector thermal efficiencies.\eta = \eta_0 - a_1 \left(\dfrac{T_{\text{in}} - T_{\text{amb}}}{G}\right)

Solar Thermal Efficiency Metric Output

Interactive visualization based on your current inputs

Calculated Value
0.017345067Collector Instantaneous Efficiency

What Is the Solar Thermal Collector Thermal Efficiency (Hottel-Whillier-Bliss) Calculator?

This tool computes solar thermal collector thermal efficiency (hottel-whillier-bliss) calculator with high precision arithmetic.

How Does the Solar Thermal Collector Thermal Efficiency (Hottel-Whillier-Bliss) Calculator Work?

Uses the ASHRAE / European EN 12975 Hottel-Whillier-Bliss equation to calculate glazed solar water heating collector thermal efficiencies.

Solar Thermal Collector Thermal Efficiency (Hottel-Whillier-Bliss) Calculator Formula & Variables

The core mathematical equation utilized by this calculator is expressed as:

η=η0−a1(Tin−TambG)\eta = \eta_0 - a_1 \left(\dfrac{T_{\text{in}} - T_{\text{amb}}}{G}\right)

Uses the ASHRAE / European EN 12975 Hottel-Whillier-Bliss equation to calculate glazed solar water heating collector thermal efficiencies.

How to Use the Solar Thermal Collector Thermal Efficiency (Hottel-Whillier-Bliss) Calculator

  1. Enter your parameters into the designated input fields to calculate the result immediately.

Step-by-Step Example Calculation

Solar Thermal Collector Thermal Efficiency (Hottel-Whillier-Bliss) Calculator Example

Input Values:

solarIrradianceG:800
fluidInletTempC:45
ambientTempC:20
Worked Steps: Sample evaluation based on standard reference conditions.

Understanding Your Result

The calculated primary figure indicates the optimal or required % efficiency.

Factors That Affect the Result

  • Measurement tolerances, operational variance, and real-world conditions.

When Should You Use This Calculator?

  • Everyday budgeting, technical homework, professional estimation, and household projects.

Assumptions & Limitations

  • Assumes standard atmospheric or environmental parameters unless specified.

Frequently Asked Questions

Calculation Accuracy & Reference Note

Double-precision IEEE 754 arithmetic with validated empirical constants.

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