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a_sh-v [17]
4 years ago
13

You’re engineering an energy-efficient house that will require an average of 6.85 kW to heat on cold winter days. You’ve designe

d a photovoltaic system for electric power, which will supply on average 2.32 kW. You propose to heat the house with an electri-cally operated groundwater-based heat pump. What should you specify as the minimum acceptable COP for the pump if the pho-tovoltaic system supplies its energy?
Engineering
1 answer:
Oxana [17]4 years ago
8 0

Answer:

2.95 approximately 3

Explanation:

For a heat pump,

COP = Q/W

Where Q = power needed for heating process

W = power input into heat pump.

Power for heating Q = 6.85 kW

Proposed power input to heat pump W = 2.32 kW

Minimum COP = 6.85/2.32 = 2.95

Approximately 3

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5 0
3 years ago
Read 2 more answers
Output all combinations of character variables a, b, and c. If a = 'x', b = 'y', and c = 'z', then the output is: xyz xzy yxz yz
gladu [14]

Answer & Explanation:

//written in java

public class Main {

   public static void main(String[] args) {

       //declare a char variable for a, b, c

       char a;

       char b;

       char c;

       //assign a b and c

       //a b and c can be replaced for with  

       // '#', '$', '%', then with '1', '2', '3'

       // for further testing

       a = 'x';

       b = 'y';

       c = 'z';

       //output for all possible combination for a, b, c.

       System.out.println("" + a + b + c + " " + a + c + b + " " + b + a + c +

               " " + b + c + a + " " + c + a + b + " " + c + b + a);

   }

}

7 0
4 years ago
You should always engage the parking brake whenever using any type of lift.
Shtirlitz [24]

Answer:

I would yes every time so it would not role off the lift

Explanation:

8 0
3 years ago
Diodes can be used to protect electronic components from certain flowing in another Direction describe another application outsi
Anvisha [2.4K]

Answer:

Plumbing  using a one-way check valve to stop water flowing back on a pump when the pump shuts off.

Explanation:

Diodes are like check valves, keeping current from flowing both ways.  Used to create d.c. out of a.c by rectification.  Also to block flow if d.c. power like a battery is hooked up in reverse polarity.

4 0
3 years ago
A heat engine does 210 J of work per cycle while exhausting 440 J of waste heat. Part A What is the engine's thermal efficiency?
Oxana [17]

Answer:

The engine's thermal efficiency is 0.32

Explanation:

Thermal efficiency = work done ÷ quantity of heat supplied

Work done = 210 J

Quantity of heat supplied = work done + waste heat = 210 + 440 = 650 J

Thermal efficiency = 210 ÷ 650 = 0.32

6 0
3 years ago
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