The awareness about keeping the environment safe and clean has increase a lot in the recent years. This awareness has led different industries to adopt environmental friendly methods in order to manufacture goods. A lot of focus has been put in to making every environmental friendly so that this beautiful ecosystem can be preserved.
The refrigeration industry has also realized that the HFC refrigerant used in the refrigeration appliances have very negative effect on the environment. The high level of energy consumption is also not good for the environment. So the refrigeration industry is putting a lot of effort in finding new alternative refrigeration design and refrigerants which will help in reduction of energy consumption and will not be a safety hazard.
Here are some of the alternative and greener refrigeration systems that can be used on large commercial levels:
In this refrigeration system the compressors have been divided on a rack into the different sub-groups. This design is better when it comes to matching the different temperature requirements of the circuit to which it is connected. This design has been improved to reduce the wastage of energy consumption.
The load is divided in to matched groups and the compressors system is placed physically closer to the loads that are being cooled.
In this system there is no single system that sends the refrigerant throughout the entire store. The refrigerant to all the loads is sent through two suction groups which are further divided in to several smaller systems. These systems are placed closer to the load which results in decreased wastage of refrigerant as well as energy. The distributed systems are usually smaller than the centralize rack system.
Secondary loop systems:
Another alternative design is the second loop commercial refrigeration system. The benefits of this system are the refrigerant charges, reduction in leakage, simple maintenance and low running cost. In this system two types of refrigerants are incorporated in order to provide cooling. The refrigerant used in the first loop is the traditional direct expansion design. The refrigerant used in primary loop are the phase changer refrigerants like R404a and they have a compressor which helps in circulating the refrigerant. The primary fluid is limited to the machine room and a heat exchanger is used to transfer energy from the first loop to the secondary one. The refrigerant used in the secondary loop is single phase fluid and is benign. It is circulated to all the individual evaporators with the help of a pump.
Through this system the concerns about the product safety, environmental issues, energy efficiency and cost efficiency have been addressed to some extent.
In cascade refrigeration systems the cooling takes place in more than two or more stages. These systems mostly used the liquefaction of the natural gas and some other gases. One of the benefit of this system is that the refrigerants used in it can be selected with appropriate properties. Refrigerant use at each different level can be selected for the optimum temperature of the evaporator according to the temperature of the evaporator and the condenser.
A two-stage cascade system utilizes two refrigerants which are connected in series so that the temperature of about -85 C can be achieved.
Carbon dioxide systems:
The depletion of ozone layer and global warming has led to the reduction of HCF refrigerants and increased use of alternative and natural refrigerants. Carbon dioxide is a very efficient refrigerant and is seen as a very suitable alternative to the HFCs because of its low temperature applications in the large commercial refrigeration systems. It has excellent physical properties and high volumetric cooling capacity which makes it very a very viable refrigerant.