Central Heat Pumps
Central Heat Pumps
Conventional heat pumps generally do not perform well when the outdoor temperature drops below 0°C. This is because the compressor in conventional heat pumps easily overheats while operating in low outdoor temperatures.
Under such conditions, the compressor suction pressure drops significantly and the refrigerant mass flow rate reduces due to its thermal properties, which in turn diminishes the system’s heating capacity.
In order to regain the system’s heating capacity, the compressor runs at a much higher speed to boost the discharge pressure back to a normal level, thus overheating the compressor.
Zuba-Central, on the other hand, overcomes this common issue with its H2i technology, and at the heart of that is the Flash Injection Circuit. The Flash Injection Circuit increases the heating capacity of the system while maintaining a high compressor discharge pressure without overheating, even when outdoor temperatures are well below 0°C.
The Flash Injection Circuit is a patent-pending technology, which consists of a Heat Interchanger (HIC) and a compressor equipped with an injection port. It works by allowing for a portion of two-phase refrigerant (gas-liquid) to bypass the outdoor coil, and recollect heat energy at the Heat Interchanger (HIC) that is normally rejected during the flash process in the outdoor unit.
The Flash Injection Circuit then injects the energized two-phase refrigerant at a lower temperature into the compressor through the injection port during the compression process. This reduces the temperature inside the compression chamber, allowing the compressor to run at higher speeds to offset the effect of low suction pressure and the low refrigerant mass flow rate.
As a result, Zuba-Central is able to maintain a high heating capacity and achieve higher performances without being affected by the cold.