SOLAR COOLING - Cooling with collectors and solar trackers

Many people today dream of producing cooling exploiting the free solar energy, which particularly in summer is largely available. Today, this is possible. The fundamental idea of the solar cooling and its technology are, as a matter of fact, quite easy: combining the thermal solar energy (water solar panel) with absorption chillers make this dream possible. Absorption chillers are widely known to be able to cool with an inlet of hot water.

TECHNOLOGY TO EXPLOIT RENEWABLE ENERGY

The growing difficulty in getting electrical energy from the national net and the related risks of black out which are strictly linked led to take into great account the opportunity to cool using low amounts of primary energy and using renewable energy such as PV more and more. There is ample choice of technologies for the passive cooling to improve indoor comfort and to drastically reduce the summer energetic need, both for buildings still to plan, and for existing building structures, both domestic and commercial.
Besides this, solar radiation is largely available in nature. The solar technologies for cooling are efficient and generally reliable both for the short and long term. These technologies do not make use of harmful refrigerant fluids (as a matter of fact, they generally use mixtures of water and LiBr) and have minimal energy consumptions in comparison to the traditional systems and therefore operating costs are lower.
Although absorption refrigerators powered by hot water –steam-combustible gases have been available to the market for more than a century, these were available only for elevated powers. In recent years the technology of the absorption cooling has made amazing progress, using new materials and electronic components, raising the quality standards both in terms of efficiency and reliability. Today we are witnessing a rapid development of enbloc frigorific absorption chillers of low power, hot water direct- fired (to 85-90°C). It is recognised that this opens interesting perspectives for their combined use with solar collectors.



An example of a SOLAR COOLING SYSTEM with integration boiler and tank system sto store hot and cold water.

CHOOSING SOLAR COOLING…THAT’S WHY!

The main advantages of using an absorption chiller powered by under vacuum solar collectors are:

- Use of thermal energy otherwise dissipated
The use of thermal energy allows lower costs and high energy savings. For these reasons absorption chillers are compared to energy recuperators; 
- Environmental- friendly thanks to the use of a natural solution
No harmful fluids are used. Furthermore, the energy used to power the absorption chiller has a low impact on the environment (low CO2 emissions); 
- Low consumption of electric energy
which is used exclusively for operation of circulation pumps; 
- Simple and compact system
thanks to enbloc equipment complete with all the necessary accessories, as a consequence, the installer will only have to connect pipelines for the hot water and conditioning systems. A further connection for makeup water must be provided to compensate for losses by evaporation from the cooling tower; 
- Outdoor installation:
space-saving solution; 
- Modulation according to the thermal load
thanks to inverters for managing the pumps. Thanks to Systema-Broad enbloc systems, frigorific power can be modulated from 20 to 100%. This allows water-supply/ electrical energy/ cooling water reduction, according to the customer’s needs; 
- High efficiency (COP= 0,74)
The absorption chillers mod. SYBCTDH and SYBYDH have higher performances (COP= 0,74) than other conditioning systems of the same power which use hot water indirect-fired absorption chillers with low temperature (90°C); 
- Long life-cycle and reduced need for maintenance:
the reliability of the absorption chiller is due to minimal moving mechanical components and compressors; 
- No noise and no vibration; 
- Low fixed costs:
since no electric cabin and transformer room are needed, the final user will have less fixed costs.

In order to satisfy several ranges of power capacity Systema can supply outdoor enbloc absorption chillers of high power or a series of absorption chillers can be installed using the cascade principle since the cooling tower is already included in the system.
The available powers capacity with temperature water of 98°C are: 45 kWs; 70 kWs; 175 kWs; 437 kWs; 656 kWs; 744 kWs; 875 kWs; 1094 kWs etc…

PHOTO GALLERY

• Brochure SOLAR COOLING

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