anwendung greenchiller
RE-COOLING
›     Heat dissipation options
GENERAL INFORMATION
Air-conditioning requires that heat is continuously extracted from the rooms and dissipated into the environment. Since it flows from warm to cold areas, heat can flow into suitable heat sinks inside the building as long as the heat sink temperature is below the temperature in the room. At the same time, there must be a source of (waste) heat which is warmer than the environment into which the heat quantity is supposed to be dissipated.

TECHNOLOGY

The heat generated in adsorption and absorption chillers is most commonly dissipated into the environment by a wet cooling tower or a dry re-cooler. Since dry re-cooling for thermally driven chillers is often hindered by high outside air temperatures, it is also possible to fit the dry re-cooler with a spray lance. When dealing with high outside air temperatures, the fins on the dry re-cooler will be dampened, causing the re-cooling temperature of the chillers to drop due to the evaporation of the water. It is also possible for some applications to achieve re-cooling by utilizing ground water, a swimming pool or the soil. The effect the re-cooling temperature has on the capacity of the absorption or adsorption chiller is immense: If the cold water temperature is fixed, the temperature difference will have to be increased (by raising the waste heat temperature) by one Kelvin at the same capacity in order to achieve a drive temperature that is 2-3 Kelvin higher. This shows not only how great the impact of re-cooling is on the chiller process but also how it is possible to compensate for more unfavourable re-cooling conditions by significantly raising the drive temperatures.

The dissipation of heat into the environment requires temperatures between 25°C and 40°C depending on the outside air conditions and the respective technology used for re-cooling
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