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In order to accommodate with the high accuracy requirement of solar irradiance measurement, a new kind of heat flow equation in solar absolute radiometer is developed in this paper. The detailed solution procedure is present by using the method of separation of variables and principle of superposition. The applications of new equation are also investigated, too. The application in SIAR (Solar Irradiance Absolute Radiometer) shows that the ultimate theoretical value of time constant of SIAR is 18s which apparently smaller than the experimental result of 30s. The result agree with our expectation and helpful for the improvement of SIAR. The application in PMO6 (Physikalisch Meteologisches Observatorium Radiometer-6) shows that the new heat flow equation could deduced from the theory of double exponential function proposed by Gentile, which also proves the correctness of itself.

New Useful Heat Flow Equation in Solar Absolute Radiometer and Its Applications