In Yamagushi series absorption chillers thermal energy is used for maintenance of the heat exchange process instead of the electrical power (as in compression chillers), which allows for a unique low power consumption. In the Yamagushi series chillers hot steam, exhaust gases, hot water can be used as a heat source (depending on the version). The flagship model is the chiller with integrated heat source - combined gas burner (can operate on either natural gas or diesel fuel). This unit can simultaneously produce hot and cold water. Cold - for conditioning purposes. Hot - for sanitary purposes (DHW). Therefore, there is no more need to install boilers, and the unit becomes a universal and cost-effective solution for both air conditioning and heating systems. The Yamagushi series absorption chillers can be used for cooling systems on all types of facilities with high thermal load - both administrative (co-conditioning), and industrial. Since the operation principle of the Yamagyshi series chillers is based on the absorption process, the structure does not contain any moving parts, large-rating electric motors, bearings, which has resulted in low levels of noise, vibration, and therefore, a longer service life and higher level of reliability.

Functional elements
The figure on the page 40 shows the location of the functional elements of a Yamagushi series two-stage absorption chiller manufactured by Kitano. A model with an integrated combined heat burner is used as a heat source is shown. The heat produced as a result of the unit operation is removed through the hydraulic cooling circuit of the condenser and cooling towers.

The evaporator is a source of cold for the absorption chiller. Water (which acts as the refrigerant) in the liquid state is injected on the outer heat exchange surface of the evaporator and begins to evaporate.
The evaporated water cools down the heat exchange surface of the evaporator. At the same time the water (or antifreeze) inside the heat exchange surface also cools down.

Absorber - a unit in which the vapours of refrigerant (water) are absorbed in a concentrated lithium bromide solution. A high temperature absorbent is injected inside the absorber unit. The absorption process is accompanied by removal of heat to the hydraulic cooling circuit. Thus, the concentrated lithium bromide solution is diluted with water (weakened) in the absorber, and turns into the weak lithium bromide solution.
High temperature generator - is a unit in which a weak solution of lithium bromide is heated by the energy of secondary sources (in this case - a built-in gas burner). When heated the solution emits vapours of the refrigerant - water which also have a high temperature at this stage. Thus, the lithium bromide solution becomes more saturated.

Low temperature generator - is a unit in which the saturated lithium bromide solution is heated by the vapours of the refrigerant - water heated in the high temperature generator. This gives a strong solution of lithium bromide, which is returned to the absorber.
The condenser is a heat source. The refrigerant vapours coming out of the low-temperature generator condense and pass from a gaseous to a liquid state. At the same time the energy produced in course of condensation is removed to the hydraulic circuit of the condenser cooling.