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Spectrally Tuned All-Polymer Technology for Inducing Cooling (STATIC)
SRI is co-developing a system for cooling water discharge ponds at thermoelectric power plants.
SRI and PPG Industries Inc. are collaborating to integrate SRI’s proprietary Spectrally Tuned All-Polymer Technology for Inducing Cooling (STATIC) technology into a radiative cooling system and cover that can cool water during the day or at night without evaporation. With support from Advanced Research Projects Agency-Energy’s (ARPA-E’s) Advanced Research in Dry (ARID) cooling program, the cover will be designed for use in cooling water discharge ponds at power plants.
In thermoelectric power generation, only about 40 percent of energy in the fuel is used effectively for power generation. The remainder is in the form of low-grade heat that must be carried away by condenser-based cooling systems. To reject the heat, these systems typically use water from a river, lake or ocean, pass it directly over tubes containing the condenser water and then return the water—now warmer—to its source.
Project Innovation and Advantages
STATIC technology uses a two-layer polymer structure to cover a pool that holds power plant condenser discharge water. The polymer-based top-layer STATIC film prevents sunlight from penetrating the structure and warming the water while allowing thermal energy to radiate to the sky, even during the day. The structure provides an insulating air gap to prevent conductive and convective heating.
Both layers work in concert to reject solar energy. The bottom layer acts as an emitter at the water temperature and radiates heat to the sky. The top layer and key component, produced using STATIC technology, enables transmittance of the thermal radiation. The cooling power can achieve greater than 100 W/m2 without evaporation. All materials are inexpensive and amenable to scalable manufacturing techniques.
If successful, SRI’s technology could provide power plant operators a low-cost way to supplement power plant cooling without consuming additional water resources. Benefits could include:
- Security: SRI’s structure could reduce dependence on water for power plant cooling by providing an inexpensive means of supplemental cooling without sacrificing power plant performance. STATIC is passive; no power input is needed to achieve cooling.
- Environment: The STATIC system enables passive radiative cooling, reducing the need for additional water or power inputs to cool power plant condenser water.
- Economy: With no input power required, and by applying low-cost manufacturing techniques, SRI estimates the structure could cost less than $150 per kW, which would not notably raise the levelized cost of electricity for operators.
In addition to the power plant cooling market, the technology may have applications in sectors where cooling is needed but limited infrastructure is available to provide it.
The information, data, or work presented herein was funded in part the Advanced Research Projects Agency-Energy (ARPA-E), U.S. Department of Energy, under Award Number DE-AR0000576. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.