Class II Absorption Heat Pump

Normally, Class II absorption heat pump is one kind of LT waste heat-driven device, which absorbs heat from waste hot water to generate hot water with a higher temperature than driven waste hot water. The most typical feature for this kind heat pump is that it can generate hot water with a higher temperature than waste hot water without other heat sources. In this condition, waste hot water is also the heat source. This is why Class II absorption heat pump is known as temperature boosting heat pump.

The waste hot water enters generator and evaporator in series or in parallel way. The refrigerant water absorbs the heat from waste hot water in evaporator, then it evaporates into refrigerant vapor and enters absorber. The concentrated solution in absorber becomes diluted solution and releases heat after absorbing the refrigerant vapor. The absorbed heat heats the hot water to the required temperature.

On the other hand, the diluted solution enters generator after heat exchanging with the concentrated solution via heat exchanger and returns to generator, where it is heated by the waste hot water and concentrated into concentrated solution, then delivered to absorber. The refrigerant vapor produced in generator is
delivered to condenser, where it is condensed into water by the low temperature cooling water and delivered
to evaporator by refrigerant pump.

Repeating of this cycle constitutes a continuous heating process.