Implications of natural refrigerants for cooling technologies

The Problem

Especially in developing countries and emerging economies, the refrigeration and air conditioning (RAC) ssector is expanding and is expected to account for 13 % (GCI, 2014b) of global greenhouse gas (GHG) emissions by 2030. Since the Montreal Protocol (1989), HFCs have been widely used to substitute CFCs and HCFCs, but unfortunatelly their global warming potential (GWP) is 4,000 times higher than CO2. Thus, in the Kigali Amendment of 2016, 197 countries have committed to phase down HFCs, expecting to hinder 90 % of the temperature increase that would have been caused by HFCs. This heightens the pressure on manufacturers to produce climate friendly RAC equipment.

Introducing Natural Refrigerants

This guide intends to provide arguments and guidance for changing from HFCs to natural refrigerants. These are less expensive than HFCs/HFOs, are commercially available for almost every application and system type and is constantly being developed to improve the safety and reduce their costs. In addition, they have negligible GWP and no ozone depleting potential (ODP). They are infinite and their extraction from the atmosphere does not damage the environment.

Aim of the Report

The guide adresses in particular the manufacturbrers of commercial and industrial equipment. The aim is to:

• introduce international agreements and the regulatory landscape in key global regions,
• preaesent available environmentally-friendly alternatives as direct replacement for HFCs and other chemical blends currently used in the refrigeration sector,
• provide information on relevant technical and economic aspects of relevance when converting to environment-friendly alternatives,
• provide practical application examples to showcase the technical feasibility of alternative technologies.

The recommendations intend to support manufacturers to be ahead of upcoming phase-out legislations and to shorten their learning curve.

Case Studies

The recommendations intend to support manufacturers to be ahead of upcoming phase-out legislations and to shorten their learning curve by providing relevant information obtained from experiences. The study includes 3 case studies, which allow an insight into the main technical and financial impacts of conversion to natural refrigerants, and briefly describes the conversion steps and challenges experienced by different refrigeration manufacturers from Bangladesh, Swaziland and South Africa.

Outlook

Natural refrigerants pose a future-proof solution due to their very good environmental and technical performance. The fast development of F-gas regulations around the world and the price development of synthetic refrigerants makes an early conversion to natural refrigeratns the safest opportunity to avoid a drawback in the market.

However, to support their timely introduction, barriers that currently slow down the wide-scale introduction of natural refrigerants, such as funding, standards and regulations, and adequate training, need to be addressed and solved.

Further challenges are mainly related to the properties of natural refrigerants, namely:

• the flammability of hydrocarbons,
• the toxicity of ammonia
• the high operating pressure for CO2
• and the associated technical, financial and legal implications.

These aspects need to be taken into consideration when redesigning the refrigeration technologies and is currently being developed.

Publication

The article and related study will be linked in the near future, once the study is launched.

References

Green Cooling Initiative (2014b). Country data map – http://www.green-cooling-initiative.org/country-data/ (accessed on 10 July 2018)