Testing for the hybrid heat exchanger and parameter optimization was completed and final report was submitted and is under review. Relative to conventional condensers, the Advanced Hybrid Heat Exchanger (AHHEX) can reduce evaporative cooler yearly water use by up to 98.7 percent for a 170-ton example cooling system operating in Oakland at constant load. The water and electric power reductions is expected to be up to 2.1 million gallons/year and 28,499 kWh/year, respectively. While the test system capacity was smaller than the targeted commercial and industrial markets, the AHHEX is modular and capacity can be added by duplicating and connecting panels in parallel to the larger chiller. Data from this project can be applied to full-scale commercial and industrial condensers and AHHEX can be scaled to range of applications.
This project uses high performance porous fins to enhance cooling through water vaporization and mass transfer. By retrofitting the heat exchanger with a water spray feature, this project has the potential to reduce energy and water use of HVAC and refrigeration systems in California. The developed Advanced Hybrid Heat Exchanger (AHHEX) only uses water when ambient temperatures rise above 85 degrees F. The ambient air temperatures in California rise above this level only a limited number of hours per year. This means that the AHHEX will have lower energy needs when the air temperature is low and water not used, compared to a conventional systems.
Based on the test results extrapolated to a 170 tons cooling application, the AHHEX reduced water use by up to 2.1 million gallons/year and reduce energy use by 28,499 kWh/year. This translates to about $4,500 in annual savings assuming an average electricity cost of $0.156/kWh. If AHHEX was implemented to only 20 percent of the commercial and industrial markets in California, it is estimated that the AHHEX would annually save over 3 million kWh and 300 million gallons of water. This translates to over $500,000 in annual savings to commercial and industrial facilities.
Key Project Members
John T. Kelly
Quantum Energy Services & Technologies, Inc. (DBA: QuEST)
Altex Technologies Corporation