Rising utility costs and increasingly stringent environmental standards demand more economical and energy-efficient temperature control in all buildings. The new Hybrid VRF system from Mitsubishi Electric cuts energy costs in half by simultaneously heating and cooling. Using advanced heat recovery technology, the Mitsubishi City Multi Hybrid VRF saves energy by redirecting the heat captured during the cooling process to areas requiring heating, such as hot water tanks.
The advanced two-pipe heat recovery technology uses refrigerant only between the outdoor units and the patented Hybrid Branch Circuit (HBC) controller, while water replaces refrigerant between the HBC and the indoor units. This reduces exposure risk to harmful refrigerants in occupied spaces by 30% and complies with international legislation and environmental trends.
Offering increased energy efficiency, the patented Hybrid Branch Circuit (HBC) controller allows heat exchange between refrigerant and water, transferring energy around the building using a pair of water pipes connected to each indoor unit to supply hot or cold water. In fact, the Mitsubishi City Multi Hybrid VRF is up to three times more efficient than a traditional geyser as 1KW of power produces up to 3KW of heating capacity!
Simply put, the HBC intuitively directs the necessary energy to areas requiring heating or those which require cooling, using water rather than refrigerant.
Flexible installation with fewer resources
Flexible to design and install with fewer pipes and units than traditional HVAC, the new hybrid system offers the same control and network of a Variable Refrigerant Flow (VRF) combined with the added benefits of a chiller system – heat one room up to 30 degrees Celsius, whilst chilling another down to 14 degrees. The heat exchange process simultaneously heats water up to 70 degrees or chills it down to 10 degrees.
The 2-pipe Heat Recovery System does not require an external pump and control panel usually necessary for chillers. All valves, pumps and heat exchangers are contained within the HBC.
The system monitors high pressure, low pressure and the heat exchanger mode to set an appropriate compressor frequency. Water flow from the indoor unit is automatically adjusted by the temperature difference between inlet and outlet, based on required temperature settings, thereby ensuring no energy is wasted.
The decentralised system means phased installation is possible with the same high levels of seasonal efficiency expected from VRF. This reduces the resources required for installation whilst ensuring a comfortable environment during the retrofit.
Less refrigerant = less greenhouse gas = reduced leak detection = increased occupant safety
HVRF is ideal for applications where individual control settings or simultaneous heating and cooling such as hotel rooms, hospitals, offices and schools is required, or limitations on refrigerants and occupant safety restrictions are imposed.
With the use of centralised control, HVRF is well suited to buildings that require individual temperature settings – from operating theatres to wards and consulting rooms, server rooms to boardrooms, hotel rooms to kitchens, clubhouses to gyms and changerooms.
Since the indoor units are water-based, they provide low noise levels whilst providing comfortable and efficient temperature control with variable airflow. Less refrigerants in occupied spaces reduces the need for expensive leak detection systems and ongoing maintenance.
In addition, by using less refrigerant in the total system, the Mitsubishi City Multi HVRF system also minimises rising SGG (Synthetic Greenhouse Gas) or Emissions Trading Scheme (ETS) levies which increase the cost of refrigerants used in commercial airconditioning systems.