You construct a metal shield to surround the furnace. The new shield has an emissivity of...

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You construct a metal shield to surround the furnace. The new shield has an emissivity of Es = 03 Now E1 1 = 0.8, Es = 0.3, and 2 = 0.9 Determine the ratio of new and old heat transfer rates ( a) Q = 0 081 new old Q b) c) Q new new Q old old = 0 190 = 0 324 Q d) Qnew Q old Q = 0 480 Onew old). You are trying to reduce the heat transfer rate from a furnace. Currently, the outer surface of the furnace has an emissivity of 1 = 0.8, which radiates to the surroundings with an average emissivity of 2 = 0.9. For each of the following situations, determine the ratio of new and old heat transfer rates ( new' old). You construct a metal shield to surround the furnace. The new shield has an emissivity of Es = 03 Now E1 1 = 0.8, Es = 0.3, and 2 = 0.9 Determine the ratio of new and old heat transfer rates ( a) Q = 0 081 new old Q b) c) Q new new Q old old = 0 190 = 0 324 Q d) Qnew Q old Q = 0 480 Onew old). You are trying to reduce the heat transfer rate from a furnace. Currently, the outer surface of the furnace has an emissivity of 1 = 0.8, which radiates to the surroundings with an average emissivity of 2 = 0.9. For each of the following situations, determine the ratio of new and old heat transfer rates ( new' old).