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Comfort, without the environmental cost

Chinese innovation provides green solution to temperature extremes

The quest for a constant, comfortable temperature in which to live and work can be directly linked to approximately 60% of CO2 emissions in the atmosphere, an action which ironically leads to the uncomfortable temperature extremes that we were so anxious to avoid.

A Chinese company has found an innovative solution to the challenge of moderating temperatures in regions which experience both extremely hot summers and cold winters.

The Hunan Qiuke Heat-Source-Tower Heat Pump Technology Engineering company (QIUKE) was named as a WWF Climate Solver for its design of a wide-finned copper pipe evaporator system which works equally well in humid summer and winter conditions.

The wide-finned structural design uses sensible heat (the warmth generated when an object is heated) and latent heat (heat that causes a change in state – from liquid to solid or gas - without changing the temperature) to supply air conditioning, heating and hot water for the building.

The design reduces frosting on the air conditioning unit, which in turn means that an auxiliary heat pump is not needed, even in the most extreme conditions.

In the summer, a large scale screw air compressor is used in conjunction with the wide-finned copper pipe evaporator.

The energy savings in all seasons from the technology are as high as 30% even when used in conjunction with a traditional air conditioning system, and as much as 60% if the QIUKE system is used on its own.

According to the WWF's Senior Advisor of Climate Innovation at the Global Climate and Energy Initiative, Stefan Henningsson, if technology with this performance is applied in just 15% of new and retrofitted buildings globally by 2023, there will be a saving of about 25 million tons of CO2 emissions each year.

Zero emissions buildings in sight

Elegantly simple condensation cooling innovation promises massive greenhouse gas reductions.

Imagine an air cooling system which is self-adjusting according to the atmospheric temperature, never needs chemical cleaning and the only water it needs is harvested from rainwater.

Well, it’s real. This innovative idea, developed by Green India Building Systems and Services (GIBSS) was honoured with a WWF Climate Solver award.

“Conventional air cooling systems are responsible for as much as 70% of the energy consumption in buildings, usually through condenser systems or a cooling tower,” explains Mandar Kaprekar, Executive Director for Technology and Product at GIBSS. “We believe that zero-emissions buildings are possible, and our system goes a long way to achieving that goal.”

The innovation takes advantage of the fact that the earth retains a constant temperature throughout the year, and in the Indian tropical summer months in particular, this temperature is considerably lower than the atmospheric temperature.

The heat exchanger has an elegant simplicity: the building heat is channelled through a closed water piping system buried in the earth below the building. Harvested rainwater flows through this geofield system, rapidly dropping in temperature, before being channelled back into the building where it cools the air around it.

“In India alone, residential, commercial and public buildings account for about 89 million tonnes of CO2 emissions,” says Stefan Henningsson, Senior Advisor of Climate Innovation at WWF’s Global Climate and Energy Initiative. “We recognised the innovative potential of the GIBSS system, with its potential to significantly reduce both emissions and costs.”

If the GIBSS system is adopted in new and retrofitted buildings, it has the potential to reduce greenhouse gas emissions by about 20 million tonnes by 2022.

Since being named as a WWF Climate Solver company, GIBBS has installed its system in a number of buildings. Operating costs for these properties have dropped between 50 and 60%, which means that the system pays for itself less than two years after installation.

The company's commitment to the environment also extends to the safe disposal of redundant air cooling systems in retrofitted buildings. GIBBS buys the old systems from the building owners and provides certification of safe disposal, further adding to their green building credentials.

The social impact of the system is also significant. Since its establishment, GIBSS estimates that the power freed up on the grid by the system has been sufficient to light up as many as 149 small villages in the subcontinent.