Low GWP Refrigerants - e-news about HPT Magazine

HPT MAGAZINE - A Heat Pump Centre Product

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In this issue:
Low GWP Refrigerants
- System Solutions and Components

Climate change is going on around us, across the world, and there is also no doubt that we need to tackle it. The deployment of heat pumping technologies is one way to do this, leading to energy efficiency and reduction of CO2 emissions. Unfortunately, the refrigerants currently used in heat pumps have a high global warming potential (GWP) and are thus themselves potent climate gases. There are also refrigerants with significantly lower GWP, both such that have been known for a long time and more recently developed ones. Some of these come with another challenge: they are flammable to different degree, which needs to be dealt with.

Below is a list of articles included in the Magazine. The articles in bold can also be found further down, in versions shortened by the HPC.

Heat Pump Conference in Jeju 2020
HPT TCP welcomes two new Annexes
Illegal refrigerant sales challenge the F-gas Regulation
Annexes in HPT TCP: 49, 51
Market Report: Heat pump market report for Italy
Seven burning questions about mildly-flammable refrigerants
Low-GWP refrigerants for refrigeration and air-conditioning systems in Japan
Performance of centrifugal chiller and development of heat pump using low-GWP refrigerant
New ways of combining Heat Pumps and District Heating

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Heat pump market report for Italy

The Italian heat pump market is one of the largest in Europe. And it keeps growing. In recent years it has increased dramatically: with 23 % in 2015 and 46 % in 2016. As many as 97 % of the heat pumps use air as their energy source and the rest are mainly ground-source devices. Lately, hybrid systems combining a gas boiler with a heat pump have entered the market and experience a positive trend.

Seven burning questions about mildlyflammable refrigerants

First they depleted the ozone layer, then they contributed to global warming, and now they might exacerbate fires. That is the history of refrigerant substances, in brief. And now the flammability of different refrigerants needs to be taken care of.

The current phase-down of hydrofluorocarbons(HFC) refrigerants is due to their high global warming potential, i.e., for environmental reasons. This is not a big problem as long as they stay inside the device. But in many cases they don’t. They slowly leak into the air,eventually contributing to the effects leading to global warming. As an example, residential air conditioning systems on average leak 8.5 % annually. Therefore, a replacement is needed.

Low-GWP refrigerants for refrigeration and air-conditioning systems in Japan

The heatpumping technology sector once again needs to shift refrigerants. And once again it is for environmental reasons. But the introduction of other substances means that other types of challenges need to be met, and this time handling of flammable and combustible refrigerants is on the top of the agenda.

Performance of centrifugal chiller and development of heat pump using low-GWP refrigerant

Regulating the use of certain refrigerants is part of the fight against global warming. And as the use of refrigerants with high global warming potential (GWP) becomes ever more restricted, companies developing heat-pumping devices must adjust their products. The Japanese companies Mitsubishi Heavy Industries Thermal Systems and MHI Bingshan Refrigeration are well on their way in that process.

New ways of combining heat pumps and district heating

A system combining heat pumps and district heating would get the best from both techniques. But in Sweden, where both techniques are widely spread, there has rather been a competition between the two. Until now. In recent years the interest has increased, and there is a new focus on finding optimal combinations. The research project Heat Pumps in District Heating Systems has investigated three alternatives, as described below.

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