The present invention relates to a low-power absorption refrigeration machine that enables the use of air as a refrigerant and has an evaporation unit that is separated from the rest of the absorption refrigeration machine and works with LiBr/H.sub.2O, H.sub.2O/NH.sub.3, LiNO.sub.3/NH.sub.3 or similar solutions, configuring an air-air machine wherein cold is produced directly in the enclosure to be air conditioned without need for impeller pumps and fan coils.

A co-fired generator for use in a continuous-cycle absorption heating and cooling system may provide heat to the interior of an annulus chamber from a first heat exchanger, such as a firetube heat exchanger, supplemented by heat to the exterior of the annulus chamber from a second heat exchanger containing fluid heated by an external source. Some embodiments may circulate fluid heated in a solar-heated collector through the second heat exchanger. Other embodiments may route exhaust gas from a combustion engine through the second heat exchanger. The second heat exchanger may be provided with a plurality of fins to increase the surface area available for thermal transfer between the heated fluid and the annulus chamber.

A co-fired generator for use in a continuous-cycle absorption heating and cooling system may provide heat to the interior of an annulus chamber from a first heat exchanger, such as a firetube heat exchanger, supplemented by heat to the exterior of the annulus chamber from a second heat exchanger containing fluid heated by an external source. Some embodiments may circulate fluid heated in a solar-heated collector through the second heat exchanger. Other embodiments may route exhaust gas from a combustion engine through the second heat exchanger. The second heat exchanger may be provided with a plurality of fins to increase the surface area available for thermal transfer between the heated fluid and the annulus chamber.

Working material for absorption machines using ammonia (NH.sub.3) or methylamine (CH.sub.3NH.sub.2) or dimethylamine ((CH.sub.3).sub.2NH) as the working agent and using water (H.sub.2O) as the solvent, to which a small amount of basic water glass is added, i.e., a certain mixture of water glass and bases, which does not contain any chromium salts as corrosion inhibitors.

Working material for absorption machines using ammonia (NH.sub.3) or methylamine (CH.sub.3NH.sub.2) or dimethylamine ((CH.sub.3).sub.2NH) as the working agent and using water (H.sub.2O) as the solvent, to which a small amount of basic water glass is added, i.e., a certain mixture of water glass and bases, which does not contain any chromium salts as corrosion inhibitors.

An absorption cycle based system is disclosed for using waste heat from a vehicle and providing selective heating, cooling, and dehumidifying to a vehicle compartment. The system includes a waste heat loop in thermal communication with a power generating unit of the vehicle, and a vapor absorption subsystem. The vapor absorption subsystem may include a thermal compressor in thermal communication with the waste heat loop, a radiator unit, a condensing unit for heating the vehicle compartment, an evaporating unit for selectively cooling and dehumidifying the vehicle compartment, and a plurality of valves configured to selectively direct refrigerant through the vapor absorption subsystem. The vehicle compartment may include at least one of a passenger cabin, an electronics housing, a battery pack, an engine compartment, and a refrigeration compartment.

A solar powered air conditioner and/or refrigerator system includes a solar absorber heat generator to be exposed to sunlight in communication with a continuous cycle absorption refrigerator inside an adjacent building. Piping connects the out door solar absorber heat generator in fluid communication between the continuous cycle absorption refrigerator and the solar absorber heat generator. Refrigerant grade anhydrous ammonia solution circulates in that piping. A control panel with at least two sensors, an out door thermostat sensor and an indoor thermostat sensor, are in electrical communication. A linear Fresnel lens is located above the solar absorber heat generator to concentrate solar energy. A sun tracker may also be mounted to the Fresnel lens for continuously orienting the Fresnel lens toward the sun to provide maximum solar absorption.

A solar powered air conditioner and/or refrigerator system includes a solar absorber heat generator to be exposed to sunlight in communication with a continuous cycle absorption refrigerator inside an adjacent building. Piping connects the out door solar absorber heat generator in fluid communication between the continuous cycle absorption refrigerator and the solar absorber heat generator. Refrigerant grade anhydrous ammonia solution circulates in that piping. A control panel with at least two sensors, an out door thermostat sensor and an indoor thermostat sensor, are in electrical communication. A linear Fresnel lens is located above the solar absorber heat generator to concentrate solar energy. A sun tracker may also be mounted to the Fresnel lens for continuously orienting the Fresnel lens toward the sun to provide maximum solar absorption.

An absorption heat pump apparatus for optimizing performance in low air temperature and/or high delivery water temperature operating conditions which maintains all the functions of the so-called booster systems, preventing the generator from exceeding the maximum temperature limits. Furthermore, the apparatus allows a significant increase in the efficiency of the heat pump when the booster mode is activated for producing high temperature hot water in the case of medium or high outdoor temperatures, i.e., conventionally, for producing domestic hot water which is required throughout the year.

An absorption heat pump apparatus for optimizing performance in low air temperature and/or high delivery water temperature operating conditions which maintains all the functions of the so-called booster systems, preventing the generator from exceeding the maximum temperature limits. Furthermore, the apparatus allows a significant increase in the efficiency of the heat pump when the booster mode is activated for producing high temperature hot water in the case of medium or high outdoor temperatures, i.e., conventionally, for producing domestic hot water which is required throughout the year.