10.8 Test and rating standards: BIS, EN 14511, EN 16147, ISO 13256, AHRI
A test standard fixes how a unit is measured: air and water temperatures, flow, tolerance and instruments. Two units can only be compared fairly when tested to the same standard at the same conditions.
Think of a car's fuel mileage. A highway figure and a city figure differ for the same car. Heat pump COP changes the same way with source and sink temperatures.
| Standard | Body / region | What it covers (general) |
|---|---|---|
| BIS (Indian Standards) | Bureau of Indian Standards, India | Indian standards for safety and performance of air conditioners, heat pumps and electrical appliances; some products need BIS certification |
| EN 14511 | European (CEN) | Rating of capacity and COP/EER of air conditioners, chillers and heat pumps (air and water sources) at defined conditions |
| EN 16147 | European (CEN) | Testing of heat pumps for domestic hot water, including tapping cycles and water heating COP |
| ISO 13256 | International (ISO) | Rating of water-source and ground-source (brine) heat pumps |
| AHRI standards | Air-Conditioning, Heating, and Refrigeration Institute, USA | Performance rating of HVAC and heat pump equipment; certification directory in North America |
| ISO 817 / ASHRAE 34 | ISO / ASHRAE | Refrigerant designation and safety classification (from 10.3) |
| ISO 5149 / EN 378 | ISO / CEN | Safety and environmental requirements for refrigerating systems and heat pumps |
Condition shorthand: "A7/W35" means outdoor air 7 °C, water leaving at 35 °C. "W10/W35" means source water 10 °C, leaving water 35 °C. "B0/W35" means brine 0 °C.
Worked example — reading a rating
A datasheet says: heating capacity 10 kW, power input 2.5 kW at A7/W35, and 9 kW, 3.2 kW at A7/W55.
- At A7/W35: COP = 10 / 2.5 = 4.0.
- At A7/W55: COP = 9 / 3.2 = 2.8.
- For hot water at 55 °C in Pune, use COP 2.8, not 4.0. At ₹9/kWh (example rate), 100 kWh of heat costs 100 / 2.8 × 9 = ₹321, not ₹225.
Remember
- Always quote the test condition with any COP.
- EN 14511 for space heating/cooling ratings; EN 16147 for domestic hot water.
- ISO 13256 for water- and ground-source units.
- Check whether BIS certification applies to the product in India.
A rated capacity or COP only means something if you know which standard and which test conditions produced it.
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