Page 38 - Climate Control News Dec-Jan 21

Compressors, Condensers & Evaporators
RIGHT: The Ammonia Compressor Pack in action
For larger systems, ammonia packs a punch
“CONNECTING SEVERAL SCREW COMPRESSORS OFFERS HIGHER OPERATING RELIABILITY.”
reliable, efficient ACP operation based on the current operating conditions. They require around half the starting current of a single compressor with the same refrigerating capac- ity, which results in smaller components and lower installation costs.
Connecting several BITZER screw com- pressors and their intelligent capacity con- trol in parallel ensures high efficiency espe- cially in part load and offers higher operating reliability than single compressors in the same capacity class.
Application limits can be monitored with the aid of alarm and shut-off thresholds as well as operating parameters to ensure maximum reli- ability. The moment the alarm threshold is ex- ceeded, the operating unit automatically initi- ates countermeasures and sends a message to the master control system.
DUE TO ITS exceptional energy efficiency and outstanding thermodynamic characteristics, ammonia is the ideal refrigerant for industrial re- frigeration applications such as ice rinks, ware- houses and larger systems in the food industry.
BITZER has decades of experience in the pro- duction of components suitable for ammonia – and, with its Ammonia Compressor Packs, also
offers higher cooling capacities, each up to 3 MW (–10/35 °C).
Each ACP contains up to three compressors as well as a motor, oil separator and oil circuit. Operating unit, economiser and frequency in- verter are optionally available.
In combination with the integrated BITZER IQ technology, an ACP operating unit ensures
Semi-hermetic HFO portfolio
SPEED INCREASE
GEA’s Grasso LT screw compressor
GEA has increased the maximum top speeds for several of its reciprocating and screw compressors.
The reciprocating compressor models GEA Grasso V 700, V 1100, V 1400, and V 1800, formerly at maximum speed of 1,200 rpm, can now be operated with NH3 up to 1,500 rpm.
For GEA Grasso LT screw compressor types R, S, and T the allowable speed for NH3 will increase from previous maximum 3,600 rpm to 4,500 rpm.
The speed increase provides clients with a significant increase in capacity It translates into 25 per cent more capacity with the same financial outlay.
FOLLOWING THE RELEASE of the new LG range refrigeration and air-conditioning spe- cialist GEA Bock will extend its semi-hermetic compressor portfolio with technology for all synthetic refrigerants.
Bock’s new foray into low-GWP compressors includes both the common HFC fluids and the new HFO low-GWP fluids with a GWP value of less than 150.
GEA Bock product manager, Dalibor Sandor, said this will enable planners and operators to implement individually configurable, economi- cal system solutions for future-proof refrigerants that safely and sustainably meet the require-
GEA Bock extends its LG compressor range
ments for the global phase-down of F-gases - as regulated in the F-Gas Regulation and the Kigali Amendment.
The development of the new LG compressor range is the result of continuous research includ- ing internal and external long-term tests in vari- ous applications.
“Here it became clear that conventional com- pressors are not suitable for safe and reliable op- eration with HFO refrigerants. The driving gears and seals in particular generally lost their func- tional reliability in the long term due to the higher requirements of these refrigerants,” Sandor said.
“Different refrigerants require compressors with a special technical design was the conclu- sion of the GEA Bock experts - for maximum ro- bustness, reliability and durability over the en- tire life cycle of a system.”
HFO refrigerants such as R455A or R1234ze place significantly higher demands on the com- pressors than standard HFC refrigerants such as R404A and R134a - especially the driving gear and keyword emergency running properties.
The reason: HFO refrigerants have a much higher solubility in oil. For this reason, Bock en- gineers developed a special driving gear design for the new LG range that makes the compres- sors “less sensitive” to falling oil viscosity.
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