Panasonic Double Effect Direct Gas Fired Absorption Chiller/Heater

Product Range
20 TR to 1500 TR

Panasonic Sanyo Direct-fired Absorption chiller/ Heater are air conditioning system creating space excellent in regard to environment friendliness, energy saving, ans economy. They are being used in office building, hotels, department stores, hospitals, schools, convention centers, government building, etc. The power full and stable air conditioning systems have been ex-changers reduces the fuel consumption ans ensures a highly efficient operation, further improving the environment friendliness and energy savings

COP 1.2 (LVC)

The use of high-efficiency heat transfer tubes and new heat exchangers has improved the COP (approximately 10 %) during cooling operation.

Control function for the cooling water flow rate:

By controlling the cooling water flow rate according to the cooling load, the power consumption of the cooling water pumps has been reduced. The cooling load is determined inside the equipment and an optimized cooling water flow rate control signal is put out. And, the power of cooling water pump is controlled automatically. Then, the power consumption of the system is reduced.

Speedy Digital PID control

New digital PID control to the f-Model stabilizes the chilled/hot water temperature with high accuracy than the previous E model. It quickly responds to the load fluctuation and supplies stable chilled /hot water temperature. It is suitable for air-conditioning intelligent building which require sophisticated control.

Solution level control of high temperature generator

With the new control system, solution flow rated is precisely controlled so that the solution level of the temperature generator is maintained as a certain level.

Frequency of maneuvering has been substantially reduced with the synergistic effect of absorbent pump inverter control. This enable the supply of a more stable temperature for chilled/hot water compared to conventional models.

Purge System

The high performance purge system maintains the required operating pressure, preserves the chiller performance characteristics, minimizes chiller maintenance.

High Temperature generator safety control

When the temperature of the high temperature generator is higher than a certain temperature level, the gas consumption is controlled to sustain safe operation.

Expansion of safety operating Zone

This function ensure quick response to rapid changes and maintains stable operation.
Safety operating zone is between 19 C and 34 C of cooling water temperature. (In case cooling water inlet temperature setting is 32 C.

Saving energy with the inverter

Balance the load and flow rate with the absorbent pumps inverter control enables efficient and energy saving operation, As a result, it saves the input energy and electric power consumption, running cost by 5% compared to none inverter control.

Crystallization Protection

Microprocessor observe the absorbent concentration. When it is close to crystallization, the combustion stops to prevent it.


Absorbent pumps with isolation valves and TRG function.
Refrigerant pump with isolation valves (DF-31 to 63).

The Absorbent Cycle

The absorption cooling cycle, like the mechanical vapor compression refrigerant to remove heat from the entering chilled water. Vapor Compression refrigeration system uses HFC based refrigerant and a compressor to transport the refrigerant vapor to be condensed in the condenser. The absorption cycle, however, uses water as the refrigerant and an absorbent lithium bromide to absorb the vaporized refrigerant. Heat is then applied to the solution to release the refrigerant vapor from the absorbent. The refrigerant vapor is then condensed in the condenser.

The basic single effect absorption cycle consists of evaporator, absorbent, generator and condenser with refrigerant (water) and lithium bromide as absorbent.

Here is a vacuum vessel which is composed of evaporator and absorber. Under the vacuum condition, the refrigerant water evaporates at approx. 5 deg C. when the refrigerant evaporates; it takes heat from chilled water. Therefore, the chilled water temperature goes down. To maintain the vacuum condition, the vaporized refrigerant has to be absorbed by lithium bromide. Otherwise, the vacuum condition can’t be kept. Cooling water is used to increase the absorption effect. The diluted solution (water & Lithium bromide) goes to generator, and then the generator utilize as heat source (burner, steam or hot water) to separate the refrigerant from the absorbent. The concentrated solution (lithium bromide) goes to absorber and absorbs the refrigerant again. On the other hand, refrigerant vapor goes to condenser, and the cooling water is used again to condense the refrigerant vapor and transfer the heat to outside. Then, liquid refrigerant goes to evaporator again.

As mentioned in the single effect type, the refrigerant vapor produced by the low temperature generator is sent to the condenser to become liquid refrigerant. On the other hand, the refrigerant vapor produced by the high temperature generator turns to water as it releases heat to the intermediate LiBr solution. This happens inside the heat transfer tubes in the low temperature generator. The refrigerant vapor produced by both low and high temperature generators turns to refrigerant liquid and mixes in the condenser before returning to the evaporator.

Double Effect Type

The generator section divided into a high temperature generator and a low temperature generator. The refrigerant vapor produced by the high temperature generator is used to heat the LiBr solution in the low temperature generator in which the pressure (hence the boiling point) is lower. Thus the heat of condensation is effectively utilized.

Heating Cycle

In the absorption heating cycle, the unit us essentially acting as a boiler. Diluted solution is heated in the high temperature generator releasing refrigerant vapor from the absorbent. The refrigerant vapor flow to the absorber/evaporator and condensed on the heat transfer tubes of the evaporator. The water through the evaporator heat transfer tubes removes the condensed refrigerant and transfer the heat to the hot water loop. The condensed refrigerant is mixed with intermediate solution creating diluted solution. The diluted solution is pumped back to the high temperature generator where the cycle is stared again.