But with jet pumps, each of us are familiar with since childhood. This is an ordinary household refrigerator. Only it works vice versa, because it is not intended to raise the temperature for us, and lowering it for our perishables. Items are placed in the insulated chamber where the heat is pumped out and dumped in a room where there is a fridge (to feel “a grid” on his back – hot!).
But there is still room air conditioners. When we were getting hot, we include air conditioning and jet pumps it out of the room to the street.
Do not remind you that, as from a flooded basement “unnecessary” water is pumped out the water pump up and then dumped into sewers or into the nearest ravine?
This is understandable, but how jet pumps work?
The principle of common vapor-compression jet pumps (and refrigerators are also common) is based on two physical phenomena:
- When a substance evaporates, it absorbs heat, and when condensed, gives warmth;
- When the pressure is changed, is changing the temperature of evaporation and condensation of matter: the higher the pressure, the higher the temperature and vice versa.
With these events, we too often encounter in everyday life.
Our advice. If you want to cool down the heat a bottle of beer, and a refrigerator away, wrap the bottle with a wet cloth and put in Tenek on the breeze. The evaporated water will select some of the heat and cool the beer in it.
Our caution. Beware of scalding. The steam condenses on the skin, give it stored heat and burn will be more dangerous and more painful than just hot water.
Our information. Did you know that the climbers in high mountaineering base prevented eat boiled eggs? At high altitude at a reduced air pressure water boils at a temperature of 60 – 65 ° C and it is impossible to cook eggs.
The heart of the heat pump – a closed circuit filled with substance. Part of the circuit is at low pressure where the substance evaporates and absorbs heat at low temperature, while the other part – at high pressure where the substance condenses and releases heat at high temperature.