kW·h/K
kilowatt-hour per kelvin
Heat capacityexact by definition
The kilowatt-hour per kelvin is exactly 3.6 × 10⁶ J/K. It is the working unit of thermal storage sizing: a 1000 litre buffer tank is 1.16 kW·h/K, so a 40 K swing stores about 46 kW·h.
| 1 kW·h/K | 3,600,000 J/K |