i-Vu®, Carrier’s open control system, has features that can be valuable for: - EA prerequisite 1: Fundamental commissioning of energy management system - EA credit 3: Enhanced commissioning (2 points) - EA credit 5: Measurements and veriﬁcation (3 points).
Note: Products are not reviewed or certiﬁed under LEED®. LEED® credit requirements cover the performance of materials in aggregate, not the performance of individual products or brands. For more information on LEED®, visit www.usgbc.org.
Screw compressors use positive displacement principle to compress gases at higher pressure. As a result, in case of exceptional high temperature condenser side (due for example to coil fouling or operation in harsh climate) the compressor does not switch off, but continues operation at reduced capacity (unloaded mode). The silencer in the oil separator line (at the compressor outlet) considerably reduces discharge gas pulsations for much quieter operation.
Novation® Heat Exchangers with Microchannel Coil Technology
Already utilised in the automobile and aeronautical industries for many years, the Micro-Channel Heat Exchanger (MCHE) used in the AquaForce with Greenspeed® technology is entirely made of aluminum. This one-piece concept signiﬁcantly increases its corrosion resistance by eliminating the galvanic currents that are created when two different metals (copper and aluminum) come into contact in traditional heat exchangers. From the energy efﬁciency point-of-view the Novation® heat exchangers are approximately 10% more efﬁcient than traditional coils and micro-channel coil technology allows a 30% reduction in the amount of refrigerant used in the chiller. The low thickness of the MCHE reduces air pressure losses by 50% and makes it susceptible to very little fouling (e.g. by sand). Cleaning of the MCHE heat exchanger is very fast using a high pressure washer. To ensure constant level of performance during time and protect coils from early deterioration or, in worse case, refrigerant leaks, Carrier offers (as options) dedicated treatments for installations in corrosive environments. - The Novation® heat exchangers with Enviro-Shield protection (option 262) are recommended for installations in moderately corrosive environments. The Enviro-Shield protection utilises corrosion inhibitors which actively arrest oxidation in case of mechanical damage. - The Novation® heat exchangers with exclusive Super Enviro-Shield protection (option 263) are recommended for installations in corrosive environments. The Super Enviro-Shield protection consist in an extremely durable and ﬂexible epoxy coating uniformly applied over all coil surfaces for complete isolation from the contaminated environment.
Inverter-driven Thunderbolt screw compressor
The new generation of Carrier inverter-driven screw compressors beneﬁts for Carrier’s long experience in the development of twin-rotor screw compressors. The design of the Thunderbolt compressors is based on the successful 06T screw compressor, core of the well-known AquaForce series. A dedicated oil separator is installed at the discharge of each compressor to ensure maximum oil return: Oil separates from refrigerant per gravity and returns to the low pression side of the compressor without use of additional pumps. Advanced control algorithms combine inverter frequency output with motor input logic to minimise mechanical part stress, resulting in best compression performance and high chiller reliability. The compressor is equipped with bearings with oversized rollers, oil pressure lubricated for reliable and durable operation, even at maximum load.