HPT TCP Annex 53 (participant Baolong Wang (Tsinghua University) partners with Gree Electric Appliances, Inc. (leading Chinese heat pump system manufacturer) to capture Grand Prize in the Global Cooling Prize contest. On April 29, Sir Richard Branson announced the Gree/Tsinghua team as co-winners (along with the Daikin group team) of the Global Cooling Prize contest. The contest began in November 2018 and 139 teams submitted detailed applications in August 2019. From these eight finalist teams were selected. The finalists prepared prototypes of their concepts which were field and lab tested at locations in India between Sept. 2020 to March 2021.
Gree’s innovative Zero Carbon Source cooling technology integrates advanced vapor compression refrigeration, photovoltaic direct-driven technology, evaporative cooling, and ventilation, which efficiently utilizes renewable energy sources and free cooling sources.
The innovative hybrid solution is designed to have an automatic, climate-smart operation in three modes – vapor compression refrigeration, direct evaporative cooling, and ventilation. It can operate individually or in parallel to provide optimized indoor temperature and humidity control according to the weather conditions.
The vapor compression refrigeration system adopts a parallel compression cycle with dual evaporation temperature. It is realized based on a specially-designed triple-cylinder compressor, a low GWP refrigerant, and improved-designed evaporator and condenser. The ventilator, operating in ventilation mode or direct evaporative cooling mode, strives to decrease the indoor cooling load and eliminate the latent load. The energy consumption of the cooling solution can also be decreased by the ventilator even when the outdoor air has a higher enthalpy than the indoor air. A small PV panel is integrated into the power system by a smart modulator for power transformation and distribution.
This climate-adaptive residential air conditioner has 5X lower climate impact than today’s conventional air conditioners. Gree’s cooling solution highlights how the upper efficiency limit of today’s predominant technology—vapor compression technology—can be largely expanded through smart, hybrid design.