Heat pump limitations
Heat pump limitations
(OP)
Can someone please reply what is the main reason for heat pump having limitations of not achieving temperature more than 65-70 degree Celsius??? what are the other limitations of heat pump in industrial applications





RE: Heat pump limitations
RE: Heat pump limitations
The refrigerant properties determine the temperatures and pressures the pump operates under.
in theory with a different refrigerant you could get 100°C (condenser), but then you need an evaporator stream of 40°C. the problem is, when it is 40°C outside we don't need heating....
RE: Heat pump limitations
RE: Heat pump limitations
If there is existing large heating network that is not planned for renewal, using such pumps to replace old boilers can be feasible solution if proper calculations prove it. of course, their efficiency is not comparable to ordinary heat pump regime, so they are generally unacceptable for new projects.
RE: Heat pump limitations
RE: Heat pump limitations
Heat pumps work via the "vapor compression refrigeration cycle"; in short this evaporates/condenses a refrigerant in the respective sides of the cycle. I just found this page this morning and it will help explain the physics.
Basically, temperatures you are able to get out of a heat pump are limited by the physical characteristics of the refrigerant used.
RE: Heat pump limitations
RE: Heat pump limitations
On the page I linked previously there are graphs showing a curve that looks like a bell, this curve is a saturation line and represents when the refrigerant is completely gaseous or liquid with the space under the curve being a mix of gas and liquid. What the graphs do not show is actual temperature and pressure values. This is because the bell curve moves based on the physical characteristics of the refrigerant. Manufacturers can also play with the pressure of the refrigerant to move the cycle curve up and down on the bell curve; or they can get really fancy and add things like hot gas bypass completely changing the shape of the curve (but that would be a topic for another thread).
In a Carnot cycle there would is no limit to the temperature of a heat pump which does not answer OP's question.
RE: Heat pump limitations
RE: Heat pump limitations
mr carnot himself did not live in ideal world, but he managed to abstract principles which allow us to have overall understanding now.
skipping general, basic theory while dedicating to some isolated detail of the problem is no. 1 reason for costly mistakes which are often irreparable in economically feasible way.
RE: Heat pump limitations
RE: Heat pump limitations
RE: Heat pump limitations