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TMA FC (190-1.200 kW) Air cooled chiller with centrifugal compressors, axial fans and Free Cooling for outdoor installation.
T urbomiser™
GHA FC (68-1.700 kW) Air cooled chiller with screw compressors, axial fans and Free Cooling for outdoor installation.
G VHA FC (18-1.163 kW) Air cooled chiller with scroll or reciprocating compressors, axial fans and Free Cooling for outdoor installation.
V
FREE COOLING
PAG. 2
Free Cooling Operation The operation of the free cooling system consists of finned pack heat exchangers placed in front of the condensing coils. The air crosses the water coils before hitting the refrigeration condensers of the refrigerant.
the ambient and the desired chilled water temperature (EER is higher than the water/air delta temperature increase).
The chiller can operate under three main conditions: • mechanical cooling When the outdoor temperature • partial free cooling is lower than the returning water • total free cooling temperature the free cooling system can operate. The free cooling efficiency (EER) depends on the temperature difference between
FREE COOLING
PAG. 3
Mechanical cooling
Ambient temperature is higher than the returning water temperature. In this case the free cooling system is completely excluded and water cooling is obtained by compressor action only.
FREE COOLING
Partial free cooling
Total free cooling
Ambient temperature is lower than the returning water temperature (with a difference of at least 2-2.5 째C). In this case the water cooling depends on a combined action between the free cooling operation and the working compressor. The system runs in this way when the water/ air temperature difference is not so high and the water coils cannot achieve the total required cooling capacity.
Ambient temperature is lower than the returning water temperature. The water cooling and total cooling capacity depends on the free cooling operation only. The compressor action is completely excluded. Normally, with standard applications, total free cooling can be achieved when the ambient is at least 6 째C lower than the desired chilled water temperature.
PAG. 4
Microprocessor Control System The abovementioned types of operation are automatically managed by a microprocessor control system designed to optimise energy consumption keeping to the preset working conditions.
the water coils before crossing the evaporator.
Through the sensor monitoring the evaporator entering water temperature, the microprocessor accordingly reduces the compressor The microprocessor receives four action (multistep capacity control) until they are completely temperature inputs from excluded if total free sensors reading the folcooling operation is lowing parameters: reached. • ambient temperature TAE If the free cooling • returning waefficiency is ter temperature too high (as from user’s plant the ambient or TFC • evaporator enterrequired cooling load is very low) to ing water temperakeep a constant leaving ture RWT water temperature, the • evaporator leaving water temperature LWT microprocessor proportionally reduces the air flow through the When the ambient air is at least 2 coils and if this is not sufficient, it °C lower than the returning water controls the water flow in the coils temperature, the microprocessor by means of the three-way valve allows the free cooling system to opening. operate. Thanks to the three-way valve opening, water flows into FREE COOLING
PAG. 5
Superior efficiency Whenever it is required to maintain These units are therefore indicated liquid even during the winter, Free for conditioning systems for data Cooling chillers are the best choice. processing centers, for the refrigeration of industrial processing The Free Cooling system works centers or of industrial processes. whenever ambient conditions are low enough to cool the chilled wa- The higher the difference of temter without using refrigeration com- perature between the circulating pressors. The system is especially water and the outdoor air, the beteffective when chilled water tem- ter the system will perform. peratures are relatively high.
EER
EER of FC units compared to standard units at the same conditions.
Chiller Mode
35 째C
FREE COOLING
TFC
PAG. 6
-10 째C
TAMB
High quality components Finned Pipe Coils Condenser coils made up of high-efficiency aluminium fins equipped with self-spacing clamps to guarantee not only perfect spacing (distance between fins) but also perfect contact with copper or stainless steel pipe (the latter on request), suitably spindled. FC coils made of copper pipes and aluminium fins. Support frame in aluminium or stainless steel, the supply collectors are equipped with air vent valves at the extremities and with water drainage valves in the lower part.
Fans section The main features of these fans adopted by Geoclima for the Turbomiser range of air cooled condensers are compactness, low noise level and exceptional efficiency. The variable speed drive fans react continuously to load variations ensuring maximum efficiency especially at partial loads. Compared to conventional fans energy savings of 30% can be achieved. Assuming continuous operation, the additional cost of these high efficiency fans is easily recovered within the first year.
HYDRAULIC CIRCUIT This includes the three-way proportional mixing valve for the insertion of the Free Cooling system, for constant water temperature control, and all the hydraulic connections between the evaporator and the finned exchangers. The entire unit is insulated with expanded rubber closed-cell type mattress, suitable for outdoor installation.
CONTROL SYSTEM Regulation has been developed to respond to the most common requirements regarding the functioning of the chiller with Free Cooling during the winter. The software has been optimized to yield maximum results in terms of energy saving. The software controls the temperature of the water leaving the evaporator, interacting in an optimal manner between the 3-way valve, the fan speed regulator and the compressors.
FREE COOLING
PAG. 7
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