Estimate load, power draw, efficiency, and yearly costs. Review Carnot limits and practical system effectiveness. Use flexible inputs for reliable engineering heat pump checks.
| Scenario | Flow Rate | Inlet | Outlet | Source | Sink | Total Input | Approx. COP |
|---|---|---|---|---|---|---|---|
| Default engineering case | 18 L/min | 35 °C | 42 °C | 7 °C | 45 °C | 2.65 kW | 4.10 |
| Milder source condition | 18 L/min | 35 °C | 42 °C | 12 °C | 45 °C | 2.65 kW | Higher than base case |
| Higher lift condition | 18 L/min | 35 °C | 42 °C | 2 °C | 50 °C | 2.65 kW | Lower than base case |
Mass flow rate: m = (Flow Rate × Density) ÷ 60,000
Gross heat output: Q = m × Cp × ΔT
Usable heat output: Qusable = Q × (1 − Derate)
Actual COP: COP = Qusable ÷ Total Input Power
Carnot COP for heating: COPCarnot = Thot ÷ (Thot − Tcold)
Relative Carnot efficiency: Actual COP ÷ Carnot COP × 100
Seasonal delivered heat: Usable Heat × Seasonal Hours × Load Factor
Seasonal input energy: Operating Input × Seasonal Hours × Load Factor + Standby Power × Standby Hours
Seasonal performance factor: Seasonal Delivered Heat ÷ Seasonal Input Energy
The calculator uses water-side heat transfer, practical losses, electric input power, and thermodynamic lift to estimate engineering performance with transparent assumptions.
Heat pump performance depends strongly on temperature lift. Smaller lift usually improves COP because the compressor works across a narrower pressure range.
Water-side capacity estimation is useful when flow and temperature measurements are reliable. If sensors drift, the calculated COP may look better or worse than actual field performance.
Carnot COP is not a real machine rating. It is a theoretical upper bound that helps engineers judge how closely a system approaches ideal thermodynamic behavior.
Seasonal performance factor is often more useful than a single-point COP. It includes operating diversity, part-load behavior, and standby losses across longer service periods.
It estimates usable heating capacity, actual COP, Carnot COP, seasonal performance factor, daily energy, seasonal energy, and operating cost from engineering input data.
Those values let you calculate delivered heat on the load side. That method is common for hydronic systems because it reflects real thermal transfer.
Carnot COP is the theoretical heating limit based on source and sink temperatures in Kelvin. Real systems always perform below this ideal value.
Derate lets you reduce gross heat output for practical losses such as controls, piping, distribution, cycling, or conservative field adjustment.
Load factor adjusts seasonal operating hours. It helps estimate average yearly performance instead of assuming full-capacity operation during every seasonal hour.
Yes. Enter the correct density and specific heat for the glycol mixture. Those properties directly affect the calculated heat output.
Sensor error, incorrect flow measurement, underestimated electrical power, or optimistic derate assumptions can all produce an unrealistically high COP.
Use it for screening, comparison, and engineering checks. Final selection should still rely on manufacturer maps, certified data, and project-specific design conditions.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.