AIR AS REFRIGERANT – WHY IS IT BETTER THAN STANDARD SOLUTION?

Air-as-refrigerant-2.png

What are the advantages of AIR as a refrigerant? How does it compare to other refrigerants?  

In today´s article, we will point out the benefits of using air as the refrigerant versus F-gas based refrigeration systems. Nowadays, the most commonly used systems for low and ultra-low temperatures are vapor compression systems and HFC gases. We would like to point out the possibility of using air as a refrigerant to reach these temperatures and get rid of a lot of hazards and achieve numerous benefits.

Refrigerants used in compression systems

Nowadays, the third generation of refrigerants known as HFCs with upcoming HFO refrigerants is the widest spread medium for cooling. Continuous phase change allows them to have relatively high efficiency and find applications in numerous industries. However, in upcoming years we will see a gradual decline of such refrigerants in favor of refrigeration systems with natural refrigerants (Air, propane, CO2, ammonia, etc. ) due to many reasons like F-gas regulation, constant price increase, emerging carbon taxes, safety hazards, etc. Let´s take a brief look:

  • HFC refrigerants are subject to the EU F-gas regulation to reduce the environmental impact of gases. Even if this and upcoming generation of gases are with 0 ODP (Ozone depletion potential), they have very high GWP ( Global warming potential) and thus when released into the atmosphere contribute to global warming. This leads to the developing of new refrigerants with lower GWP.
  • During this time, there is a need to replace parts of refrigeration systems to handle new refrigerants and directives. The vapor refrigeration system is subject to regular leak checks what can be very costly and inconvenient for company operation.  In the table below (table 1.), you can see common refrigerants and leak checks rates used for low-temperature applications under the EU directive.
Leaks in the refrigerant system
https://www.coolingpost.com/world-news/hfc-refrigerant-prices-continue-to-fall/
  • During this time, there is a need to replace parts of refrigeration systems to handle new refrigerants and directives. The vapor refrigeration system is subject to regular leak checks what can be very costly and inconvenient for company operation.  In the table below (table 1.), you can see common refrigerants and leak checks rates used for low-temperature applications under the EU directive.

Purchase prices development

  • With using this type of refrigerants, many safety hazards come in place as well. Many are toxic, flammable and may contaminate refrigerated space. Exposure of humans to these refrigerants can lead to severe poisoning. It’s important to have well ventilated technical rooms and safety protection. Also, to reach cooling capacity and high efficiency, the refrigerant has to be operated under very high pressures, which brings more demands on components and safety precautions. (More in the following standalone article about Safety).
  • Currently, many countries adopt some sorts of carbon emission taxes. In the future, we can expect a more strict tax burden on HFC refrigerants and more countries adopting such taxes.

 

AIR and its benefits as a refrigerant

With the increasing necessity of environmental way of refrigeration, historically well-known technology reverse Brayton-Joule cycle (in the US called Bell-Coleman) and only with ambient air, comes in place to substitute vapor compression and cryogen systems as a primary source of cold. Refrigeration machines working on the air cycle principle due to technological progress and increase of isentropic efficiency finally can compare and even outmatch standard systems for ultra low-temperature range (temperatures below -50°C).

Bell-Coleman refrigeration cycle
https://www.mecholic.com/2017/12/bell-coleman-refrigeration-cycle.html
  • Perhaps you didn’t even notice that air refrigeration technology started to be part of our common life already. Firstly used on board of ships for food refrigeration to nowadays usage adapted for AC in planes and in German hi-tech trains „ICE 3„.

Train AC system

  • With precise manufacturing and use of state of the art components, we are able to bring air cycle back to refrigeration. Our machines use a unique design of turbo-module where turbo-compressor and turboexpander are located in the same shaft. Such a design allows us to reduce energy consumption by up to 30%. Also to completely avoid oil management, because the shaft rotates on air-bearing on the „air pillow“ ( more in the Oil-free article).
  • With air cycle refrigeration, there is no need to be afraid of the refrigerant price increase. Machines work completely with ambient air thus there is no need for any pressure or safety equipment or lack of oxygen for breathing in the refrigerated chamber, and whole refrigeration machines work with low pressures, not more than in your car tire. Apart from the refrigeration machine itself, there is no need for refrigerant storage or extra-large vessels.
  • Due to the composition of air (N 78%, O 21%, Argon 1%, other.. ), AIR as a refrigerant is completely environmentally friendly with 0 GWP and 0 ODP. Together without flammability and toxicity AIR is an excellent choice to keep stored materials frozen and cooling down processes without the risk of contamination and health hazards. We must also point out big savings due to zero need for leakage checks and refills because air refrigeration technology is not under any regulation!

Comparison of working medium - refrigeration

Let us summarize the benefits of AIR as refrigerant

  1. Environmentally friendly, no refills, no oil management.
  2. No need for refrigerant storage, or need of frontloading. Zero shortage risk.
  3. Safe solution without any hazards and low-pressure equipment.
  4. No contamination risk of the refrigerated or technical area.
  5. Legislative compliance and no (carbon emission) taxes.
  6. Significant Savings through the life cycle of the equipment

Produktionsbetrieb

MIRAI INTEX s.r.o.
Tuřanka 98/A, Brno 627 00
Tschechische Republik

+420 530 513 661

www.mirai-intex.com

office@mirai-intex.cz

Zentrale

MIRAI INTEX GmbH
Kantgasse 1, Vienna 1010
Österreich

+43 720 230 778

www.mirai-intex.com

office@mirai-intex.com

Sie erreichen uns unter

Folgen Sie uns…



Mitglieder von: