HEAT PUMPS Continued from previous page.

demonstration of the continued innovation to meet the needs of a changing market. The new system also provides faster installation due to longer pre-charged pipe runs up to 40m – meaning less time on-site.

With the use of R32 continuing to gather pace throughout the industry and as larger heat pump for cooling systems make the move to the low GWP refrigerant, the technology will only become more efficient.

Technological advancements Looking back over 35 years and VRV units for cooling used to provide Energy Efficient Rations of approximately 3. Now energy efficiency ratio’s are ratings are up to 10, now based on Seasonal basis, due to a number of innovations such as Electronically Commutated (EC) fan motors, improved heat exchanger efficiency and lower sound designs creating more efficient systems. The single biggest change that aided EER increases was the move for seasonal efficiency being linked to the Energy Related Product Directive. This meant systems were designed for practical conditions rather than a theoretical “full capacity” condition, which was not being achieved in practice. This led to compressors being optimised for operation at lower revolutions per minute (RPM).

Also, whilst at first outdoor units could only be connected to a maximum of two indoor units at a time, today cooling systems are able to connect to up to twelve different types of indoor unit and up to 64 units in total.

By having an outdoor unit that can connect to several of those indoor, these innovative systems can optimise energy efficient heating and comfort cooling. This is because any surplus energy can be redistributed around the building,

providing additional capacity where needed, for example air curtains at a property’s entrance.

This has resulted in a technology that is able to provide excellent efficiencies and savings on both energy and costs, and provide a complete solution for any environment.

For example, heat pumps for cooling systems provide a cost-effective solution for replacing older, less efficient systems in retail and public premises. By re-using existing pipelines and wiring, these systems can significantly reduce interruptions to daily operations while providing quick and efficient installation.

To offer a complete solution, hydroboxes can be added to heat pump solutions to also provide hot water to a property. These utilise the energy extracted from the building during the cooling process to heat the water, providing a cost effective hot water solution that minimises running costs.

The evolution of smart controls within the sector has also brought further efficiency savings to heat pumps for cooling applications. By incorporating intelligent sensors, the cool airflow can be directed away from people, and automatically switch the unit to energy-saving mode or turn it off

completely, if the sensors detect that the room is empty.

44 November 2017

However, one of the

most significant developments over the last few years was the introduction of Variable Refrigerant Technology (VRT) into Daikin’s VRV IV in 2014. This innovative technology optimises efficiency whilst ensuring comfort levels and loads are met. With no set up requirements, VRT technology adjusts the temperature of the refrigerant and the temperature of the air passing over the coil and hence the temperature of the room. However, as VRT adjusts the coil temperature based on the ambient conditions and the target temperature of the room, this means that not only are loads met, but that the room continues to stay at the optimum temperature.

This is a significant change from technology ten years prior, where systems would often have to work harder to try and reach the desired temperature, particularly on a hot day. This would often lead to the machines malfunctioning and switching off as they worked too hard to reach the load, resulting in increased running costs and fluctuating indoor temperatures.

The future

As the requirements for comfort cooling and climate control continue to change, leading manufacturers will continue to look to the future and invest in innovative new solutions. It is therefore also crucial that installers keep up to date with the evolution of heat pumps for cooling technology, to continue to provide their customers with future proof and energy efficient solutions.

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