I am a mechanical eningeer, designing a prototype for a system in which a heat pump moves heat between two process tanks with built in heat exchangers. I want to use an off the shelf heat pump but I want the process tanks to be the evaporator and condensor.
If I buy a heat pump and bypass its...
But its not waste heat, I said you could treat it as if were but I can't say exactly what the system is used for and therefore using 400 kJ instead of 500 kJ of the 'waste heat' is a saving.Could you elaborate on your second point. In my design the preheat is added at a lower temperature than...
Ok thanks, I can see how you misunderstood, I asked the question because I was concerned there might be a Rube Goldberg paradox and was trying to see if someone else saw one.
The heatpump compresses gas, which heats it. the heat is exchanged with the heat exchanger. Gas is then expanded, it cools to below ambient. The surrounding air heats it. The air can be considered an infinite source for practical purposes.
The 100 kW is thermal energy moved from cold to hot. it costs 25 kW to transfer the energy because it is increasing the thermal gradient. If what you said was true, heat pumps would not exist as you may as well use a convection heater.
Normally if you then run a heat engine you'd get back less...
Please read again, you've not understood it. I didn't mention free energy once. I am trying to figure out if I can increase efficiency by preheating the heat exchanger with a pump because I can add 100 kW of heat at a cost of 25 kW.
I'll then be adding heat from a higher temperature industrial...
I have a question about conservation of energy in my system
A heat pump allows you to move a quantity of heat with a smaller energy input. It is most efficient for small temperature differences.
A heat engine allows you to convert a temperature difference into mechanical work. It is most...