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cute has been modified to produce both hot tap water and heating energy (radiator water). The Japanese version of Eco-cute only produced hot tap water. The Swedish company Ahlsell AB is the authorized Swedish importer and distributer of Sanyo CO2 heat pumps. Since July, 2005, more than 3000 units are sold in Sweden by Ahlsell. However, there has not been very much information about the performance of the modified Swedish Eco- cute available on the Swedish market. In the current project, A Sanyo made “Swedish Eco-cute” is tested at KTH, Energy technology, in the lab of Division of Applied Thermodynamics and Refrigeration The heat pump being tested is rated to deliver 4.5 kW heating power at an outdoor air temperature of -15 °C. It should also be capable of heating the tap water up to +70 °C (which is very high). The main objective of the tests is to study the heat pump unit and the heat pump system COPs, the tank performance and the defrost control. DESCRIPTION OF SANYO ECO-CUTE The Sanyo Eco-cute consists of two main parts: the outdoor unit and the indoor water tank. The outdoor unit comprises the entire heat pump unit, while the indoor unit includes the water tank and the control unit of the heat pump. According to the water temperature condition, the control unit will send out a control signal to the outdoor unit to adjust its working condition accordingly. The outdoor unit (SHP-C45DEN) The size of the heat pump outdoor unit is shown in Figure 2. The heat pump’s net weight is 65 kg. The noise level of the heat pump is claimed to be 46 db (1 meter from heat pump) and there are 860 grams of CO2 in the system. 11PDF Image | CO2 heat pumps for the Swedish market
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