Energy Query.

[Solair]

Evening guys.
Is the following statement true or false?

"A heat pump doesn't produce 3kw of heat from 1kw of energy. In fact it doesn't produce any heat at all. (well, aside from incidental heat produced by the system) What is does is take existing heat and simply move it from one place to another."

Thanks for reading.

[chemi-cool]

I would not use that explanation but its true.

[PaulZ]

Hi Solair
The First Law of Thermodynamics says that energy under normal conditions cannot be created or destroyed, simply transformed from one type of energy to another. So as Chemi-cool said it is true.
Regards
Paul

[Solair]

Thanks.
That's depressing.

[RANGER1]

I see it as transferring heat from one place to another, but heat of compression is on top of that.

There is also absorbed power in Kw & refrigeration Kw

So I think statement is FALSE

[Solair]

Energy is power integrated over time.

So is saying "from 1kw of energy" not flawed?

I'd be interested in a better way of writing the statement.

[Josip]

Hi, Solair

Evening guys.
Is the following statement true or false?

"A heat pump doesn't produce 3kw of heat from 1kw of energy. In fact it doesn't produce any heat at all. (well, aside from incidental heat produced by the system) What is does is take existing heat and simply move it from one place to another."

Thanks for reading.

We need to use 1kW of external work to pump 3 kW of energy from cold area to warm area (opposite flow is a natural way and no need to input any work) ... and here we are speaking only about COP ... how much unit of Work we have to use to move that much units of energy Q_H ....

COP= Q_H/W

statement is false ... i.e. not correct

Best regards, Josip

[Rob White]

Evening guys.
Is the following statement true or false?

"A heat pump doesn't produce 3kw of heat from 1kw of energy. In fact it doesn't produce any heat at all. (well, aside from incidental heat produced by the system) What is does is take existing heat and simply move it from one place to another."

Thanks for reading.

I'm too keen on the way it is wrote, but in principle it is true.

Thanks.
That's depressing.

???????? Why

Energy is power integrated over time.

So is saying "from 1kw of energy" not flawed?

I'd be interested in a better way of writing the statement.

I'm not sure what you are trying to say?

A heat pumps take available energy and transfers it to somewhere else.
That comes at a cost and the cost is the conversion of electrical energy
into heat energy.

However you want to explain it, it is only a transfer of heat.

Rob

.

[chemi-cool]

Hi, Solair



We need to use 1kW of external work to pump 3 kW of energy from cold area to warm area (opposite flow is a natural way and no need to input any work) ... and here we are speaking only about COP ... how much unit of Work we have to use to move that much units of energy Q_H ....

COP= Q_H/W

statement is false ... i.e. not correct

Best regards, Josip

Josip my dear friend, lets discuss the issue,
That first sentence ( A heat pump doesn't produce 3kw of heat from 1kw of energy) to my opinion, is a trap, and you fell for it.
It is not true that heat pump does not produce any heat, a motor is running, there is friction > heat is generated.

The heat pump does moves the existing heat from one substance to another using refrigerant, part of that heat is coming from the refrigerant pump motor.

Still, it only moves heat from one place to another.

limor sends her regards.

[Solair]

Who is Limor?

[chemi-cool]

Who is Limor?

that was for josip, my other half.

[Rob White]

.

Your flitting around way too fast for me

Where does Limor come into this?

You need to ask a complete sentence and if you ask a
question you need to ask it in a way we or specifically
I can understand.

Rob

.

[Josip]

Hi, chemi

Josip my dear friend, lets discuss the issue,
That first sentence ( A heat pump doesn't produce 3kw of heat from 1kw of energy) to my opinion, is a trap, and you fell for it.
It is not true that heat pump does not produce any heat, a motor is running, there is friction > heat is generated.

The heat pump does moves the existing heat from one substance to another using refrigerant, part of that heat is coming from the refrigerant pump motor.

Still, it only moves heat from one place to another.

limor sends her regards.

Not sure, whatever, maybe I fell, but what if we assume ... this like a theoretical discussion and I assume this process is ideal - Carnot ...

as you know English is not my mother tongue and for me is easy to be trapped by language ... and fell on examination


Best regards to Limor and to you,