Category EuroSun2008-7

Technical description

Condensor; 22 kW


Figure 1: Sketch showing AC-Sun used on an A/C-plant

The AC-Sun devise consists of a traditional thermal solar panel using water with temperatures between 75-95°C. An expander, based on a Rankine-process, uses the energy from solar panels to operate a compressor, which through a Carnot-process cools air in traditional air coolers:

The system only uses water as the cooling medium and there is therefore no source of pollution. The principle is to make vacuum in a small tank and thereby lowering the temperature on the water used to cool the evaporator.

A normal thermal solar collector makes hot water at a temperature from 75 to 95°C. This temperature range is very low but can be used as direct energy to the A/C-system in AC-Sun...

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Solar Cooling with an Ammonia/Water Absorption Chiller

M. Zetzsche1), T. Koller1), H. Mtiller-Steinhagen^ 2)

1 University of Stuttgart, Institute of Thermodynamics and Thermal Engineering
Pfaffenwaldring 6, D-70550 Stuttgart, Germany
Tel.: 0049-711-685-63230, Fax: 0049-711-685-63503
E-Mail: zetzsche@itw. uni-stuttgart. de
2) Institute of Technical Thermodynamics, German Aerospace Center (DLR)


The Institute for Thermodynamics and Thermal Engineering of the University of Stuttgart (Germany) is developing a solar-driven cooling system based on an ammonia/water absorption chiller. In addition to the cooling engine itself, a concept for the cooling of buildings has been realized. Essential parts of this concept are the building with chilled ceilings, an ice storage and the absorption chiller which works with a dry cooling system...

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Scenarios considered

Four scenarios were considered to show the individual influence of each one of the different variables:

• Scenario 1: NO AID: no financial aid was considered, taking only into account the energy savings resulting from the substitution of the mechanical vapour compression machine by the solar absorption cooling system.

• Scenario 2: SUBSIDY: apart from the reduction of energy consumption caused by the change of technology, a public subsidy of 50% of the cost of the solar field was considered.

• Scenario 3: SBS_CHT_SHW: the reduction of energy consumption from the use of the solar field to pre-heat the sanitary and the central heating hot water is considered as an economic saving which was added to the cooling energy savings and the public subsidy for installing the solar field

• Scena...

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