Name: Page 3 2. Underground water supply pipes in areas with cold climates must be installed based on prevention of the

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Name Page 3 2 Underground Water Supply Pipes In Areas With Cold Climates Must Be Installed Based On Prevention Of The 1 (25.77 KiB) Viewed 38 times

Name: Page 3 2. Underground water supply pipes in areas with cold climates must be installed based on prevention of the anomalous expansion of water at a temperature of 4°C, which could cause the pipes to burst. Assume that the ground is at a uniform temperature of 12°C before a worst-case scenario cold spell reduces the ground surface temperature to -10°C and maintains it at that value for 30 days. If the soil has a k 2.3 W/m-K, and a thermal diffusivity of 7.75x107 m²/s, at what depth must the pipes be installed? How much energy does the ground lose to the ambient per unit area over this entire period? Some useful information is attached on the last page of this exam. (20 points)