The vast majority of modern steam turbine plants have water condensers for cooling of which both natural and specially created water sources are used [1]. The insignificant temperature potential hinders the widespread use of the heat that is removed by the cooling water. However, this waste heat can be effectively used in greenhouses, fish farms, microalgae farms, etc. [3]. The article proposes a method for evaluating the effectiveness of using low-grade waste heat from TPPs and NPPs for heat supply to an energy-biological complex for growing microalgae. The analysis of calculations for it showed that the use of waste low-grade heat for heat supply to the department for growing microalgae as part of the energy-biological complex is very effective. The payback period of such a project is less than a year. Operating costs are reduced by approximately 12.0-22.0% annually.

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