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SANCO2 SANCO2 is a customized CO2 Heat Pump Water Heater (HPWH) that Sanden has designed to meet the North American market needs. It is based on the Eco Cute units, which is a widely accepted and commonly used water heater in Japan and were first introduced to the market in 2001. An Eco Cute is a HPWH that uses carbon dioxide as a refrigerant. “Cute” translates to hot water in Japanese which is pronounced Kyuto. Since 2011, Sanden has collaborated with local utility companies to conduct laboratory and field testing to ensure that the technology will transfer to the North American market without problems. Why CO2? Carbon dioxide is a unique refrigerant that does not contribute to global warming. The Global Warming Potential (GWP) of carbon dioxide is 1, compared to the GWP of the typically used HPWH’s refrigerants such as R134a – GWP of 1,430 and R410a – GWP of 2,086. CO2 is used as the benchmark to measure Global Warming, so these numbers translate that 1lb of CO2 released into the atmosphere will contribute 1lb of Global Warming Potential, 1lb of R134a will contribute 1,430lbs of Global Warming Potential for 100 years. SANCO2 utilizes a 22 oz. of CO2 refrigerant which is charged and stored inside of a closed loop system with an operating pressure range of 600 psi to 1,600 psi. Carbon dioxide rarely achieves its liquid state. After being compressed and heated, the CO2 refrigerant becomes as dense as liquid, while still remaining as a gas (transcritical state), substantially increasing the transfer of heat between itself and the water, especially in low ambient conditions. In addition to the refrigerant attributes mentioned above, carbon dioxide extracts heat even at very low temperatures. The unit operates down below -20°F without a back-up heating element, and will deliver a maximum water temperature of 160°F at those very low ambient temperatures. 4PDF Image | Sanden SANCO2 Heat Pump Water Heater 2017
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