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Mitsubishi Zuba-Central Heat Pumps
Rethink Heat Pumps - Efficient Heating to -30C
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.
Zuba-Central BrochureQuestions |
Answers |
Is it true that heat pumps can only provide heat to 0°C, and are often paired with a less efficient auxiliary heat such as gas furnace? |
Zuba-Central operates at high efficiency down to -30°C with Mitsubishi’s exclusive H2i technology. The system is electrically operated even under extreme low outdoor temperatures, high energy efficiency all year long without compromise. Did you know? The benefits of many traditional heat pumps are lost in winter because heat pumps and furnaces cannot operate simultaneously. |
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Do Heat pumps provide the same comfort levels as traditional a/c and furnaces? |
Zuba-Central offers the ultimate comfort with the intelligent VCSi technology & ECM fan motor. The capacity of the system is constantly changing in response to the actual demand of the house. Did you know? Only 10% of the time a system is needed to operate at maximum capacity, yet a traditional heat pump equipped with a single-speed compressor can only provide the maximum capacity all the time. That means the remaining 90% of the time your need for comfort is being ignored. |
Some heat pumps on the market said to have excellent heating performance and energy efficiency. What is the difference between Zuba-Central and them? |
Many heat pumps are designed with a 2-stage compressor or even multiple compressors in order to save energy, What this really means is you can only save energy in a 2-tier level or you are limited to as many levels as the number of compressors used. This also means more parts need to be maintained and there is a higher chance of failure. Zuba-Central houses only one Mitsubishi made variable-speed compressor. Mitsubishi Electric is world renowned for its compressors, which combine the utmost quality with manufacturing excellence. Just one variable-speed compressor offers more comfort levels than a 2-stage compressor or multiple compressors, with the same, or even better, heating performance and energy efficiency. |
The outdoor units of many air conditioners or heat pumps can be heard running. Is the operation of Zuba-Central’ outdoor unit loud as well? |
Zuba-Central’s outdoor unit is the quietest in the industry producing sound levels as low as 52dB. This sound level is equivalent to that of a mild Spring rainfall. On the other hand, although some heat pumps are quieter than many traditional air conditioners, they can still be heard operating at sound levels of at least 70dB. That's a sound level equivalent to refrigerator running or hairdryer blowing. |
The outdoor units of many energy-efficient air conditioners and heat pumps are getting bigger and occupying a lot of real estate. Since Zuba-Central is also energy-efficient, is its outdoor unit large as well? |
Compared to many energy-efficient air conditioners and heat pumps which need to expand their outdoor units in size in order to achieve high efficiency, the outdoor unit of Zuba-Central is designed with horizontal air discharge instead of the traditional vertical discharge, which is why the unit is so compact that it is only 13" deep. |
Do the Zuba-Central heat pumps cause power spikes at start-up, that makes the lights dim and flicker? |
The compressor in a Zuba-Central system features a unique “soft start” function, which draws only a small amount of power at start-up. This eliminates light flickering and energy spikes. Did you know? A traditional compressor draws most energy at start-up an energy spike. The more frequent a compressor starts up, the more energy you are using. |
Does the Zuba-Central outdoor unit have to be installed on or near the floor? |
Zuba-Central’s outdoor unit is very light and weights only 267 lbs. Because it is so slim and compact, the unit is easy to handle and may also be wall-mounted to save your space. |
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