Guangdong Senbo Kerui Air Refrigeration Co., Ltd. has applied for a patent entitled "A Method and System for Composite Evaporative Cooling" (Publication No. CN121408769A). This patent combines an evaporative air cooler with a heat exchanger to create an indirect-direct evaporative cooling composite air cooler, which can operate under multiple conditions in summer to improve efficiency. AVIC Optoelectronics has obtained a patent entitled "A Compressor Direct-Drive Cooling Device" (Authorization Announcement No. CN223909766U). This device utilizes the evaporative heat absorption of the cooling medium during circulation to cool the load heating elements, achieving a lower supply liquid temperature. Parameters such as supply liquid temperature, pressure, and flow rate can be monitored, adjusted, and controlled.
Materials and Interface Engineering: The Institute of Tribology at Hefei University of Technology has discovered that by adjusting the surface morphology of the substrate to suppress droplet splashing, positively biased surfaces can suppress droplet splashing, thereby achieving efficient evaporative cooling. The Ningbo Institute of Materials Technology and Engineering (NIMTE) dispersed hygroscopic ionic liquids within a hydrophilic polymer network to prepare an ionic gel (RIG) with both strong hygroscopicity and adhesiveness. This RIG is used for evaporative cooling in thermoelectric generators to enhance power output and maintain a stable cooling interface.
Dynamic Liquid Supply and High-Efficiency Heat Dissipation Technology: Dai Xianming's team proposed a bubble-free vaporization concept based on real-time dynamic liquid supply. By supplying liquid on demand, it matches the surface vaporization rate. At a superheat of 10 K, its heat transfer coefficient is 12 times that of pool boiling, achieving an energy efficiency ratio of 24 × 10⁴. The research also developed a new evaporative cooling technology using specially designed fiber membranes. The membranes, covered with an interconnected microporous network, can autonomously adsorb coolant through capillary action, achieving a heat dissipation record of 800 watts per square centimeter in testing. Research on capillary-driven gas-liquid two-phase thin-film evaporative cooling reveals the advantages of using three-dimensional porous fiber membrane structures. Their micron-level equivalent evaporation pore size provides the surface area for efficient thin-film evaporation, resulting in a maximum cooling heat flux exceeding 800 W·cm⁻².
System Energy Saving Analysis
Studies show that, while meeting the same room cooling load, the indirect evaporative cooling-jet refrigeration single-pass return air air conditioning system can reduce the total cooling capacity by 59.3% and save 52.7% in electricity consumption compared to a direct-flow air conditioning system.