Hybrid Dry Coolers in Refrigeration & Cooling Circuits Introduction
Jaeggi Guentner is a Swiss company manufacturing a hybrid dry cooling system, used extensively in Europe for cooling in refrigeration, air conditioning and process installations.
In the UK, we are now seeing the effect of climate change on the selection of cooling systems where designers seek to resolve the question of achieving lower cooling temperatures (for optimum chiller efficiency and energy saving) whilst designing for higher Summer ambient temperatures.
Hybrid cooling can often be the most valid answer;
• where designers seek to conserve energy and reduce water consumption in response to growing environmental and regulatory pressures (i.e. EPBD and Part L of the Building Regulations).
• where dry coolers or adiabatic spray coolers cannot achieve the desired lower cooling temperatures specified for optimum chiller efficiency and energy saving.
• where cooling towers are not permitted (due to water problems or perceived legionella risk)
Hybrid dry coolers and condensers, developed with the support of the Swiss Energy Commission, have around 1500 installations in Europe since 1991, and are used in the food, dairy, brewing, pharmaceutical and process industries as well as in power plants, commercial buildings, office buildings, banks, airports, hospitals and clinics, research centres and computer centres.
Operating costs for hybrid dry coolers are significantly lower with:
• 30-35% lower energy consumption compared to cooling towers or dry coolers
• 80% less water consumption compared to cooling towers
• low maintenance costs
Description
The Jaeggi hybrid dry cooler is a combination of a dry air cooled heat exchanger during cold and moderate seasons with hybrid dry/evaporative cooling during the hotter summer season. The cooling surface is wetted by adding water to increase the cooling capacity by a factor of 250%.
Compared to a dry aircooled heat exchanger or an adiabatic spray type cooler, this can result in a much smaller installation – thus minimising space requirements, lowering operating weight, reducing foundation loads and reducing building costs, with significantly lower energy consumption.
Compared to a cooling tower, the hybrid dry cooler can achieve the same wet bulb cooling temperatures for optimum energy efficiency. It uses 80% lower annual water consumption and at least 30-35% lower energy consumption. It is designed to eliminate the growth opportunities for legionella bacteria and is designed such that there is no aerosol or water droplet emission, so eliminating the opportunity for bacteriological contamination of the surrounding area. It is also guaranteed visible plume free under any operating conditions and is designed to operate at extremely low noise levels.
It is considered to be a high-tech cooling system that combines the advantages of the closed loop evaporative cooling tower and the dry air-cooled heat exchanger, without any of the disadvantages associated with these other systems. The operating mode depends on the heat load, the air flow rate and the ambient air conditions and is determined by the intelligent control system. The capabilities of modern instrumentation and control technology have been fully utilised making it economical to operate and by this the water consumption can be reduced by 80% and energy consumption by 30-35%, compared to evaporative systems with corresponding operational cost savings.Contact martin.scott@jaeggi-hybrid.ch
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Cooling towers are an essential element in any large scale industrial activity recently. Due to the growing need of cooling towers around the world and in India in particular, many companies have been set up to meet the demand of such towers in various industrial applications.
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