Abstract: In the context of global response to climate change and China's promotion of the "double carbon" goal, the light storage direct flexible building has become a key path for building energy change. DC air conditioner, as an important component of the end-end equipment of the optical storage and direct-soft building, has an unclear coupling relationship between its flexible regulation capability and thermal comfort. In this paper, based on the active response (APR) flexible regulation mechanism of DC air conditioners, we investigate the correlation between DC air conditioners' flexible capability and thermal comfort by building a thermal comfort testing experimental bench and carrying out six sets of experiments in the voltage range of 315 V~375 V. The experiments show that DC air conditioners at different voltages can achieve thermal comfort goals, and the greater the degree of flexibility, the less the total power consumption, but the comfort of the time to reach the standard is prolonged; the degree of flexibility of power consumption and service quality is non-linear negative correlation, the greater the flexibility, the more significant the decline in service quality, of which the 315 V experimental group has the largest decline in service quality, the ΔSQ average value of 12.984%. The study confirms that reducing the voltage can save energy through flexible regulation, but the relationship between energy saving and comfort needs to be weighed. This study provides a theoretical basis for the application of DC air conditioning in the optical storage direct flexibility system, and the coupling relationship between DC appliance power flexibility and service capability will be improved through more experiments.

Key words: Optical Storage Direct Flex, Thermal comfort, Flexibility, DC Air conditioning, PMV