Field test of operating characteristics of DVM systems in winter

Studies operating characteristics and energy consumption of the DVM (digital variable multi-unit) air conditioning system，analyses influencing factors of HHPF(hourly heating performance factor), and obtains the variety patterns of HHPF with the indoor-unit on/off ratio, outdoor temperature and indoor set temperature, and performances under partial loads. With the calculation of compressor output ratio of each testing condition, analyses the impact of the indoor-unit on/off ratio and outdoor temperature on the compressor output ratio.