Absorption heat pump for overfeed generator operating conditions

An absorption heat pump comprising:

• a generator or desorber for generating, from a first fluid, vapour for feeding via a first line to a first condenser in heat exchange contact with a transmission fluid,
• downstream of the condenser a second line entering an evaporator, the second line comprising at least a first throttle valve,
• an evaporator outlet connected by a third line to an inlet for passing vapour from said first fluid into an absorber,
• the absorber comprising an outlet for discharging an enriched solution of said first fluid absorbed in a second fluid,
• the absorber outlet connected to a heat exchanger in heat transmission contact with the transmission fluid,
• an outlet of the heat exchanger connected to a suction side of a pump, the delivery side of the pump is connected by a fourth line to an inlet of a circuit in heat transmission contact with the absorber,
• a fifth line connecting said circuit to a rich solution inlet of the generator,
• the generator having a poor solution outlet connected by a sixth line provided with a throttle valve to a poor solution inlet provided in the absorber,
• the fourth line connected to a bypass line of the absorber to enable said absorber to be at least partially excluded from the circuit, said bypass line being provided with valve means able to exclude said absorber or activate said absorber,
• a withdrawal line for introducing liquid refrigerant into the rich solution at an introduction point downstream of the pump, and wherein there is means for excluding said withdrawal line from the circuit on command.