Method for use of liquid/vapor ammonia absorption systems in unitary HVAC systems

A liquid vapor absorption system comprising:

• one or more absorbers having a heat exchange section, one or more generators containing a refrigerant absorption fluid, and a fluid loop for directing refrigerant absorption fluid therebetween,
• one or more first heat exchangers for selectively functioning as an evaporator or a condenser and one or more second heat exchangers for selectively functioning as a condenser or an evaporator and cooperating with an indoor coil for recovering thermal energy from said one or more second heat exchangers,
• a reservoir for condensed refrigerant, and first conduit means for directing condensed refrigerant between said reservoir and said one or more first heat exchangers and second conduit means for directing condensed refrigerant between said reservoir and said one or more second heat exchangers,
• a phase-change thermosyphon loop for directing condensed refrigerant from said reservoir to the heat exchange section of said absorber for removing heat of absorption therefrom, and
• reversing valve means for selectively directing gaseous refrigerant to the said one or more first heat exchangers or said one or more second heat exchangers functioning as a condenser, and for simultaneously directing gaseous refrigerant from the said one or more first heat exchangers or said one or more second heat exchangers functioning as an evaporator to the absorber for absorption therein.