A heating cable is embedded in a concrete slab for snow melting. The heating cable is heated electrically with joule heating to provide the concrete slab with a uniform heat of 1200 W/ m2. The concrete has a thermal conductivity of 1.4 W/m-K. To minimize thermal stress in the concrete, the temperature difference between the heater surface (T1) and the slab surface (72) should not exceed 18°C (2015 ASHRAE Handbook-HVAC Applications, Chap. 51). Formulate the temperature profile in the concrete slab, and determine the thickness of the concrete slab (L) so that T1 - T2 s 18°C

Question-Answer › Category: Mechanical Engineering › A heating cable is embedded in a concrete slab for snow melting. The heating cable is heated electrically with joule heating to provide the concrete slab with a uniform heat of 1200 W/ m2. The concrete has a thermal conductivity of 1.4 W/m-K. To minimize thermal stress in the concrete, the temperature difference between the heater surface (T1) and the slab surface (72) should not exceed 18°C (2015 ASHRAE Handbook-HVAC Applications, Chap. 51). Formulate the temperature profile in the concrete slab, and determine the thickness of the concrete slab (L) so that T1 – T2 s 18°C

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Kristin asked 9 months ago

A heating cable is embedded in a concrete slab for snow melting. The heating cable is heated electrically with joule heating to provide the concrete slab with a uniform heat of 1200 W/ m2. The concrete has a thermal conductivity of 1.4 W/m-K. To minimize thermal stress in the concrete, the temperature difference between the heater surface (T1) and the slab surface (72) should not exceed 18°C (2015 ASHRAE Handbook-HVAC Applications, Chap. 51). Formulate the temperature profile in the concrete slab, and determine the thickness of the concrete slab (L) so that T1 – T2 s 18°C