MUMBAI, India, March 13 -- Intellectual Property India has published a patent application (202621010582 A) filed by Symbiosis International, Pune, Maharashtra, on Jan. 31, for 'pcm-enhanced solar heating system.'

Inventor(s) include Anjali Hemant Potdar; Shiva Rajkumar Nadar; and Dr. Anirban Sur.

The application for the patent was published on March 13, under issue no. 11/2026.

According to the abstract released by the Intellectual Property India: "The present invention discloses a solar thermal collector system (100) designed for efficient renewable energy utilization. The system (100) includes an evacuated tube (102) having at least one absorber tube, a phase change material (PCM) (104) disposed in thermal communication with the absorber tube, and a heat transfer fluid (106) circulating through the absorber tube. The PCM (104) stores latent heat during periods of high solar irradiation and releases the stored heat to the heat transfer fluid (106) during periods of low or no irradiation, enabling extended operating hours and stabilized output temperature. The evacuated tube (102) with vacuum insulation reduces thermal losses, while the PCM (104) selected from paraffin waxes or fatty acids provides melting ranges between 30 C and 60 C suitable for water heating. This integration enhances thermal efficiency, increases solar fraction, and supports sustainable energy applications in domestic and industrial environments."

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