Answer:
The correct answer will be "8640 kWh".
Explanation:
The given values are:
Rate (Ql)
= 5040 kJ/h
As we know,
⇒ [tex]COP = \frac{Cooling}{heat \ required}[/tex]
On putting the values, we get
⇒ [tex]=\frac{5040 \ kJ/h}{1 \ kW}[/tex]
⇒ [tex]=1.4[/tex]
Now,
⇒ [tex]Q = Ql + W[/tex]
[tex]= 1 + 1.4[/tex]
[tex]=2.4 \ kW[/tex]
[tex]=2.4\times 3600[/tex]
[tex]=8640 \ kWh[/tex]
At 7:00PM the temperature was 40 degrees F. If the temperature dropped steadily at a rate of 6 degrees per hour, what was the temperature at 11:00 PM? Do you know what it is
Answer:
Temperature at 11:00 PM = 16 degree
Explanation:
Given:
Temperature at 7:00 PM = 40 degree
Decrease rate = 6 degree per hour
Find:
Temperature at 11:00 PM
Computation:
Total time = 11 - 7 = 4 hour
Total decrease in temperature = 4 x 6 = 24 degree
Temperature at 11:00 PM = 40 - 24
Temperature at 11:00 PM = 16 degree
A heat exchanger is to heat water (cp = 4.18 kJ/kg·°C) from 25°C to 60°C at a rate of 0.5 kg/s. The heating is to be accomplished by geothermal water (cp = 4.31 kJ/kg·°C) available at 140°C at a mass flow rate of 0.3 kg/s. Determine the rate of heat transfer in the heat exchanger and the exit tempera
Answer:
73.15 kW, 196.6°C
Explanation:
Energy in - Energy out = change in energy
[tex]E_{in}-E_{out}=\Delta E\\\\\Delta E=0\\\\E_{in}-E_{out}=0\\\\E_{in}=E_{out}\\\\Q_{in}+\dot mh_1=\dot mh_2\\\\Q_{in}=\dot mh_2-\dot mh_1\\\\Q_{in}=\dot m c_p(T_2-T_1)[/tex]
The rate of heat transfer to cold water is given as:
[tex]Q_{in}=\dot m c_p(T_2-T_1)\\\\\dot m =0.5\ kg/s,c_p=4.18\ kJ/kg.^oC, T_2=60^oC,T_1=25^oC\\\\Q_{in}=(0.5 *4.18)(60-25)=73.15\ kW[/tex]
For the geothermal water:
[tex]Q_{in}=\dot m c_p(T_2-T_1)\\\\\dot m =0.3\ kg/s,c_p=4.31\ kJ/kg.^oC, ,T_1=140^oC\\\\T_2=\frac{Q}{\dot m c_p} +T_1=\frac{73.15}{0.3*4.31}+140=196.6\\ \\T_2=196.6^oC[/tex]
Service entrance conductors must be kept a minimum of ____ feet from the sides and bottom of windows that can be opened
What type of engineer constructs the infrastructure necessary for roads airfields and water ports
Answer:
Civil Engineer
Explanation:
Structural engineers and Civil engineers are the ones who design, build, and maintain the foundation for our modern society.
Like our roads and bridges, drinking water and energy systems, sea ports and airports, and the infrastructure for a cleaner environment and many more.
In a two dimensional flow, the component of the velocity along the X-axis and the Y-axis are u = ax2 + by + cy2 and v = cxy. What should be the condition for the flow field to be incompressible
Answer:
The condition for the flow field to be incompressible is independent of a and c
Explanation:
We are given the component of the velocity along the X-axis and the Y-axis as;
u = ax² + by + cy²
v = cxy
Now, the condition for the flow to be incompressible is;
du/dx + dv/dy = 0
Now,
du/dx = 2ax
dv/dy = cx
Thus;
2ax + cx = 0
(2a + c)x = 0
Thus,the condition for the flow field to be incompressible is independent of a and c