AIR CONDITIONING REFRIGERATION
Parallel piping of EEVs Using electronic expansion devices means it is possible to close off a refrigeration circuit by simply driving the valve closed. It is not possible to do this with a thermostatic valve because it is self regulating. Utilising an electronic device means that staging of cooling or heating capacity is possible across multiple heat exchangers, giving greater control and improving system effi ciency. It also means that multiple air handling units (AHUs) or ventilation systems can be served from a refrigerant system, reducing capital costs and installation space. This is another area where the Fujitsu DX Kit
scores highly. Electronic expansion devices are generally limited to allow 25kW cooling capacity, which means that the maximum heat exchanger capacity within an AHU or ventilation system would be 25kW. The DX Kit can connect two EEVs in parallel
to provide an industry-fi rst 50kW from one heat exchanger while maintaining complete controllability, expanding the application and associated benefi ts across a wider range of applications.
Heat recovery
Air conditioning involves the process of moving energy from one place to another; removing heat energy from a room operating in cooling, transferring it through the refrigeration circuit
and expelling outside, vice-versa in heating. In most cases, once rejected the energy is lost from the system. By utilising heat recovery VRF, however, energy removed from rooms in cooling can be reused in rooms that require heating and this concept has also been integrated into DX application. Not only can energy be recovered from fan coil to DX heat exchanger, recovery can also occur between DX heat exchangers or between air handling units. By applying heat recovery to this type of design we can remove energy in one heat exchanger, cooling the air and lowering relative humidity, then transfer that energy through the refrigeration circuit and reintroduce it via the subsequent heat exchanger operating in heating. The only power requirement from a compressor point of view would be enough to supply the cooling side of the system – any heating requirement would be provided at little or no extra cost. These three features are each capable of delivering valuable benefi ts. Together in one simple package, they make it possible to realise the full potential of a system.
www.fujitsu-general.com/uk/products/
REFRIGERANT
LEAK DETECTION FIXED MONITORS, CLOUD-BASED LEAK NOTIFICATION & REPORTING SOFTWARE, PORTABLE LEAK DETECTORS, AND MORE
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www.acr-news.com • October 2023 35
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