Page 24 - Climate Control News November 2021

Compressors, Condensers & Evaporators
GEA backs
ammonia for shipping
LEFT: DNV predicts a quarter of all ships on the world's oceans will be powered by ammonia in the next 30 years.
around a quarter of all ships on the world's oceans will be powered by ammonia.
With the fuel mix of ammonia and a five per cent diesel blend, shipping can be almost com- pletely decarbonised in the long term.
The reason is that ammonia burns without emitting CO2.
In addition, it can be expected that there will be a stable supply of ammonia, since many places are working on production methods for ammonia based on renewable energy.
Another advantage is that ammonia also transports hydrogen bound in the molecule (NH3), which can be converted into electricity on site in fuel cells.
Another argument in favour of ammonia is the amount of experience worldwide in production, storage and logistics.
At ambient pressure, it already becomes liq- uid at minus 33° Celsius and is, therefore, less costly in terms of energy to handle and keep cool than natural gas, where this temperature is around -160°C.
In the case of hydrogen, the temperature would need to be lower at around -260°C.
It is, therefore, relatively easy and requires lit- tle energy to maintain liquid ammonia.
GEA PLANS TO support the shipping industry in reducing emissions as a system supplier with in-house solutions.
This was announced by the machinery and plant manufacturer and systems supplier GEA at the international Ship Efficien-
cy conference in Hamburg.
eration and heating technology using natural re- frigerants such as CO2 and ammonia.
To reduce harmful emissions, more and more ships will be powered by alternatives to heavy fuel oil and diesel in the future.
In developing appropriate con- cepts for the use of ammonia (NH3), GEA relies on its years of experience and expertise in sepa- rator technology, as well as refrig-
“AMMONIA BURNS WITHOUT EMITTING CO2.”
Experts from DNV, an interna- tional classification society and service provider in the fields of technical consulting, engineering services, certification and risk management, predict that in around 30 years at the latest,
Capacity control for any application
BITZER HAS ADDED models with IP55 and IP66 enclosure classes to its range of VARIPACK frequency inverters.
VARIPACK frequency inverters are designed for safe and easy capacity control and have been specially adapted for refrigeration and for the op- eration of BITZER refrigeration compressors.
They open up a wide range of applications in supermarkets, hotels and restaurants as well as food manufacturing and processing. VARIPACK is suitable for refrigeration and air conditioning systems as well as heat pumps and can be com- bined with single compressors and compound systems alike.
After intuitive commissioning, the frequen- cy inverters take over the control functions of the refrigeration system. They can be mounted in a switch cabinet (IP20) or outside of the switch cabinet thanks to the higher IP55/66 enclosure class.
VARIPACK frequency inverters can be oper- ated in two modes: The compressor’s capacity can either be controlled depending on an ex- ternally set signal or on the evaporation tem-
perature with an optionally available pressure control add-on module. In addition to direct control of the evaporation temperature, the speed of the condenser fan can be set via a 0–10 V output signal and a second compressor can be switched on. With pressure control, the frequency inverters have a database of all commonly used refrigerants for ease of con- figuration and monitoring.
BITZER software can be used to select a frequency inverter for specific applications and BEST software (BITZER Electronics Ser- vice Tool) can be used for easy commissioning and monitoring. Thanks to the stored data- bases, simply select the compressor model to fully configure every compressor. VARIPACK frequency inverters with the IP55/66 protec- tion class are also fitted with a display as standard which makes it possible to view the current operating conditions and adjust com- mon parameters.
VARIPACK frequency inverters ensure that, when operating in field-weakening mode, the maximum frequency is automatically limited
VARIPACK frequency inverters with the higher enclosure class.
depending on the load. Optimised adjustment to suit the system’s current cooling demand reduc- es energy consumption, increases efficiency and lowers running costs. VARIPACK is safe and reli- able as it has been tailored to and optimised with BITZER refrigeration compressors.
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