Abstract: Aiming at the insulation tank components in the gas-electric hybrid gas water heater, a collaborative method of numerical simulation and experimental verification was used to study the influence of the volume design of the soaking tank on the start-up constant temperature and secondary start-up constant temperature performance. It was analyzed that in the first start-up scenario, the small volume soaking tank had a larger overshoot temperature and a faster heating rate. In the secondary startup scenario, the small volume soaking tank has a higher overshoot temperature, which takes longer to reach the constant temperature, providing a reference basis for the design of the soaking tank in gas water heater.

Key words: Gas water heater, Soaking tank, Numerical simulation