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ozzi
3 years ago
10

A heat pump and a refrigerator are operating between the same two thermal reservoirs. Which one has a higher COP?

Engineering
1 answer:
Mkey [24]3 years ago
4 0

Answer:

Heat pump

Explanation:

COP:

 As we know that COP can be defines as the ratio of desired effect to the work in put.

The desired effect can be different for heat pump our desired effect to heat the space and for refrigeration our desired effect is cooled the space.

So

COP_{pump}=\dfrac{T_H}{T_H-T_L}

COP_{refri}=\dfrac{T_L}{T_H-T_L}

When heat pump and refrigerator are operating with same temperature limits then from expression we can say that

COP of heat pump = 1 + COP of refrigeration.

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SOVA2 [1]

Answer:

option B

Explanation:

The correct answer is option B

Seaming is an operation in which the edges are folded over another part to achieve the tight fit.

Seaming is generally used to join other parts together.

So, seaming is generally used for producing fluid-tight joints.

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5 0
4 years ago
Steam enters a turbine operating at steady state with a mass flow of 10 kg/s, a specific enthalpy of 3100 kJ/kg, and a velocity
likoan [24]

Answer:7989.86KW

Explanation:

Given data

h_1=3100 KJ/kg

\dot{m}=10kg/s

V_1=30m/s

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h_2=2300KJ/kg

V_2=45m/s

Z_2=0

using steady flow energy equation which is

\dot{m}\left (h_1+gZ_1+\frac{V_1^2}{g}\right )+\dot{Q}=\dot{m}\left (h_2+gZ_2+\frac{V_2^2}{g}\right )\+\dot{W}

10\left (3100+\frac{9.81\times 3}{1000}+\frac{30^2}{9.81\times 1000}\right )+\dot{Q}=10\left (2300+\frac{9.81\times 0}{1000}+\frac{45^2}{9.81\times 1000}\right )+\dot{W}

10\left ( \left ( 3100-2300\right )+\frac{30^{2}-45^{2}}{2\times 9.81\times 1000}+\frac{9.82\times 3}{1000}\right )-1.1\times 10=\dot{W}

\dot{W}=7989.8673 KW

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4 years ago
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lidiya [134]

Answer: IP address

Explanation:

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From the point of view of the dislocation mechanism of plastic deformation, the Bauschinger effect indicates that during repeated deformation, it is easier for dislocations blocked in front of obstacles to move in the direction opposite to their movement during preliminary plastic deformation.

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