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Support LED Lighting Terminologies Thermal Resistance
Support LED Lighting Terminologies Thermal Resistance
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Thermal resistance is analogous to electrical resistance. Electrical resistance is computed as the difference in voltage between two points divided by the electrical current flowing between them. This analogy is based on the fundamental similarity between voltage and temperature, current conduction and heat conduction: Electrical conduction occurs in response to a voltage difference; heat conduction occurs in response to a temperature difference. This is a popular analogy due the general familiarity of electric conduction in wires. Thermal Resistance is defined as the difference in temperature between two closed isothermal surfaces divided by the total heat flow between them. It further requires that all of the heat which flows through one surface also flows through the other and that no net thermal energy accumulation occurs in the volume between the surfaces. It should be noted that these "surfaces" are not physical, solid surfaces but rather imaginary surfaces of constant temperature. Defining Tj and Tx as the hot and cold isothermal surface temperatures, respectively, and the total heat flow rate between them as P, the thermal resistance between them is
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