Why does heat pump COP exceed 1?

Heat pump moves heat rather than generating it. COP_HP = 3-5 means 3-5 kW of heat output per kW of electricity. It upgrades low-grade heat from outdoor air/ground to useful space heating temperature.

What is ground-source heat pump advantage?

Ground temperature (8-12°C) is more stable than outdoor air (-15 to 35°C). Ground-source COP = 3.5-5.0 consistently vs air-source COP = 1.5-4.0 varying with outdoor temperature.

At what outdoor temperature does a heat pump become inefficient?

Air-source heat pump COP drops below 2 around -7°C and below 1.5 at -15°C. Below -15°C to -20°C, resistance backup heating is needed. Cold climate heat pumps maintain COP > 1.5 at -25°C.

Heat Pump COP Calculator

Calculate heat pump COP_HP = Q_H/W_net = T_H/(T_H - T_L) (Carnot). COP_HP = COP_R + 1. Air-source vs ground-source comparison. Seasonal performance factor (SPF) for annual heating efficiency.

2D stress state at a point. All stresses in MPa.

σx — Normal Stress X (MPa)

σy — Normal Stress Y (MPa)

τxy — Shear Stress (MPa)

⚙ Mechanical Note: Results are based on standard textbook formulas and ISO/AASHTO references. Always verify critical designs with applicable codes (ISO 898, AASHTO 1993, AISC, Eurocode 3) and a qualified engineer.

How to Use

Enter the values for the patient or scenario you are assessing. Calculate heat pump COP_HP = Q_H/W_net = T_H/(T_H - T_L) (Carnot). COP_HP = COP_R + 1. Air-source vs ground-source comparison. Seasonal performance factor (SPF) for annual heating efficiency. Use the heat pump cop result to inform your clinical assessment.

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Frequently Asked Questions

Why does heat pump COP exceed 1?

What is ground-source heat pump advantage?

At what outdoor temperature does a heat pump become inefficient?