SUPERMARKET REFRIGERATION
DC drives enable high efficiency under all load conditions. A refrigeration application operates at part load most of the time. And it is precisely in this area that DC technology works most efficiently. The potential for increasing efficiency is accessed over the largest operating time. On the other hand, systems that are still operated in on/off operation have their greatest efficiency only in full load operation, which rarely occurs. The on/off cycle is also inefficient because the refrigeration cycle needs time to reach the rated efficiency, which is not the case with DC operation.
The compressor is electrically driven by the
inverter, which in turn is integrated into intelligent electronics. A controller, equipped with a CPU, which contains the entire thermodynamic expertise in the form of sophisticated algorithms for optimising the refrigerant circuit, controls the entire system, consisting of all relevant components. The system is supported by an electronic
expansion valve with continuous ‘stepper’ modulation, suitable for every type of evaporator and a prerequisite for a fully controlled refrigerant mass flow. The precise and continuous control of the refrigerant flow in the evaporator enables an optimal degree of filling, an exact control and thus stable temperature regulation and a quick return to
the set point after defrosting. With reference to the European FGas regulations, an orientation towards
operation with natural refrigerants, in particular CO2 and propane, is necessary. Inverter technology has consolidated rapidly in recent years to fully support the requirements for future-oriented refrigerants. So far, DC inverter technology has been used in various commercial applications with refrigerants such as CO2
(R744) and propane (R290), and HFOs (R448 / R449). The smart DC technologies represent a solution
for markets with small to medium-sized areas. They are used in the following areas of application: Solutions for water- or air-cooled refrigeration units (suitable for every store format);
Solutions for condensing units (ideal for small shops, gas stations and cold rooms);
Solutions for mini-compound systems (especially for discount stores);
Solutions for beverage refrigerators and other merchandise devices.
A completion of the DC inverter technology, and its implementations in the above-mentioned areas, is the IoT platform with which new services are possible. The recorded data is used and converted into useful information for use in various areas
such as energy management, service management, refrigeration management, etc. for improvement. The stored thermodynamic, energetic and
other data are prepared in the form of easily understandable information, graphics and dashboards and presented in a user-oriented manner. Data is stored for a long time and can be processed by future applications in order to provide further information for improvement. This can be done by an internal department or by an external service provider.
The aim of the overall system presented here, consisting of DC technology and data-driven services, is to increase the future requirements of that which is driven by social changes, profit and profitability for each individual branch and branch chain. In addition, it must be possible for the central management to be informed via cloud-based benchmarking about which markets are operated particularly cheaply or less well. The DC technology has already been tested and is available. It will help to exploit the potential for energy and service efficiency as well as sustainability in the food retail sector. In particular, specialist refrigeration companies will open a new, additional business area which will relieve them of the shortage of skilled workers and employee quality.
13 – 15.10.2020 Refrigeration | AC & Ventilation | Heat Pumps
New opportunities for your business!
Chillventa
Don’t miss out when the international refrigeration, AC, ventilation and heat pump community meets for the Chillventa eSpecial – online from 13 – 15.10.2020!
You can look forward to virtual product presentations, precisely focused lectures by experts, valuable knowledge sharing, new contacts and the high-calibre digital Chillventa CONGRESS.
For more information, visit
chillventa.de/especial-participation
www.acr-news.com
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