Heat Pump & Chiller Service
Heat Pump Chiller meets the new-age industrial demands by delivering the operations of both a chiller and boiler in a single solution. It cools, heats, or does both simultaneously by offering three unique modes of operations, viz. Cooling, Heating, and Simultaneous. The ability to change loads and mode of operations according to the operational needs allows businesses to achieve maximum flexibility and overall savings. The solution offers 32% overall energy savings and 60% water savings and delivers chilled water as low as 1°C and hot water as high as 90°C.
Chillers are key components of air conditioning systems for large buildings. They produce cold water to remove heat from the air in the building. They also provide cooling for process loads such as file-server rooms and large medical imaging equipment. As with other types of air conditioning systems, most chillers extract heat from water by mechanically compressing a refrigerant.
Chillers are complex machines that are expensive to purchase and operate. A preventive and predictive maintenance program is the best protection for this valuable asset.
Mechanical Compression Chillers
Mechanical compression chillers are classified by compressor type: reciprocating, rotary screw, centrifugal, and frictionless centrifugal.
Reciprocating: Similar to a car engine with multiple pistons, a crankshaft is turned by an electric motor,the pistons compress the gas, heating it in the process. The hot gas is discharged to the condenser instead of being exhausted out a tailpipe. The pistons have intake and exhaust valves that can be opened on demand to allow the piston to idle, which reduces the chiller capacity as the demand for chilled wateris reduced. This unloading allows a single compressor to provide a range of capacities to better match the system load. This is more efficient than using a hot-gas bypass to provide the same capacity variation with all pistons working. Some units use both methods, unloading pistons to a minimum number, then using hot-gas bypass to further reduce capacity stably. Capacities range from 20 to 125 tons.
Rotary screw: The screw or helical compressor has two mating helically grooved rotors in a stationary housing. As the helical rotors rotate, the gas is compressed by direct volume reduction between the two rotors. Capacity is controlled by a sliding inlet valve or variable-speed drive (VSD) on the motor. Capacities range from 20 to 450 tons.
Centrifugal: The centrifugal compressor operates much like a centrifugal water pump, with an impeller compressing the refrigerant. Centrifugal chillers provide high cooling capacity with a compact design. They can be equipped with both inlet vanes and variable-speed drives to regulate control chilled water capacity control. Capacities are 150 tons and up.
Frictionless centrifugal: This highly energy-efficient design employs magnetic bearing technology. The compressor requires no lubricant and has a variable-speed DC motor with direct-drive for the centrifugal compressor. Capacities range from 60 to 300 tons.