Ice dams are most directly related to:

Engineering

1 answer:

musickatia [10]3 years ago

7 0

Answer:

(B) heated air in an uninsulated, unvented attic.

Explanation:

-Ice dams are formed by an interaction between snow cover, outside temperatures, and heat lost through the roof – more specifically, from heat loss through the poorly insulated ceiling of the house into the attic area and under the roof.

-Hot, humid air trapped in attics can also cause moisture to accumulate, resulting in mold or mildew.

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3 years ago

Technician A says that in a circuit that has 3 Ohms of resistance and operates on 12 volts, the amperage must be 4 amps. Technic

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The pump of a water distribution system is powered by a 6-kW electric motor whose efficiency is 95 percent. The water flow rate

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Answer:

a) Mechanical efficiency ( $\varepsilon$ )=63.15% b) Temperature rise= 0.028ºC

Explanation:

For the item a) you have to define the mechanical power introduced (Wmec) to the system and the power transferred to the water (Pw).

The power input (electric motor) is equal to the motor power multiplied by the efficiency. Thus, $Wmec=0.95*6kW=5.7 kW$ .

Then, the power transferred (Pw) to the fluid is equal to the flow rate (Q) multiplied by the pressure jump $\Delta P$ . So $P_W = Q*\Delta P=0.018m^3/s * 200x10^3 Pa=3600W$ .

The efficiency is defined as the ratio between the output energy and the input energy. Then, the mechanical efficiency is $\varepsilon=3.6kW/5.7kW=0.6315=63.15\%$

For the b) item you have to consider that the inefficiency goes to the fluid as heat. So it is necessary to use the equation of the heat capacity but in a "flux" way. Calling <em>H</em> to the heat transfered to the fluid, the specif heat of the water and $\rho$ the density of the water: