8 kw R744 CO2 Heat Pump Water heater residential usage -25 degree stable

8 kw R744 CO2 Heat Pump Water heater residential usage -25 degree stable

Description of DORIN INVERTER CO2(R744) Heat Pump Systems Carbon dioxide high temperature heat pump air source and water source

Carbon dioxide high temperature heat pump
Carbon dioxide is a natural working fluid, with high thermal conductivity and specific heat capacity, which helps to obtain high heat transfer coefficient; low dynamic viscosity can reduce the pressure drop of working fluid in the tube. The high vapor density helps to improve the mass flow rate of the working fluid, the density ratio (the density ratio represents the difference between the properties of the gas and the liquid) is small, which is beneficial to the distribution of the working fluid, and the surface tension is small, which can improve the boiling in the evaporator heat transfer intensity of the zone. The gas density is high, and the heating capacity per unit volume is large, which is about 5 times that of R22, which can reduce the size of pipes and compressors, making the system lighter, compact and small in size. The pressure ratio of the compressor (the ratio of the condensing pressure and the evaporating pressure of the working fluid) is low, the compression process can be closer to isentropic compression and the efficiency is improved. Wide range of sources and low prices.
The process of carbon dioxide transcritical refrigeration cycle is slightly different from that of ordinary vapor compression refrigeration cycle. The suction pressure of the compressor is lower than the critical pressure, and the evaporation temperature is also lower than the critical temperature. The endothermic process of the cycle is still carried out under subcritical conditions. The heat exchange process relies on latent heat to complete. However, the exhaust pressure of the compressor is above the critical pressure, and no condensate is produced during the heat release process of the working medium. The high-pressure heat exchanger is no longer called a condenser, but a gas cooler. The traditional concept of condensation temperature has been lost. Meaning, the heat exchange process relies on sensible heat to complete.

Performance of 8 kw R744 CO2 Heat Pump Water heater residential usage -25 degree stable

Ultra-low temperature working conditions: ambient temperature DB-10-C, water inlet temperature 9°C;
Defrost condition: ambient temperature DB2°C/WB1°C, water inlet temperature 9°C; low temperature condition: ambient temperature DB7°C/WB6°C, water inlet temperature 9°C; standard working condition: ambient temperature DB20°C /WB15°C, inlet water temperature 15°C; high temperature working condition: ambient temperature DB38°C/WB23°C, inlet water temperature 29°C.
Installation Notes:
1. The spacing around the installation must not be less than Im;
2. The pipelines other than the heat pump should be protected from frost and heating elements can be installed;
3. Heat insulation and protection measures should be taken for the pipelines for hot water circulation to prevent heat loss.

Application Diagram Pressure-bearing water tank 

8 kw R744 CO2 Heat Pump Water heater residential usage -25 degree stable

System Diagram Smart Control System

8 kw R744 CO2 Heat Pump Water heater residential usage -25 degree stable

System schematic diagram