Calculation of heating capacity for synthetic heating pumps

To calculate the maximum heating capacity of a combined heating pump, follow these steps: 1. **Determine the water flow rate**: - First, it is necessary to determine the flow rate of the heating pump. This can be obtained by looking up the technical specifications of the heating pump, or by calculating it based on the pipe flow rate and diameter. - Assuming the main pipe is DN300, the pipe diameter is approximately 0.3 meters. If the flow rate of water is assumed to be 1.5 m/s, then the flow volume `Q = π * (D/2)^2 * v`, where D is the inner diameter of the pipe and v is the flow velocity. The calculated flow rate is approximately 0.106 m³/s. 2. **Hot water temperature difference**: - Determine the temperature difference between the inlet and outlet temperatures of hot water. This is usually determined by system design or obtained through measurement. Assume the temperature difference is 30°C. 3. **Calculate thermal power**: - The maximum heat supply can be calculated using the following formula: `P = ρ * Q * c * ΔT`, where: - `ρ` is the density of water (approximately 1000 kg/m³), - `Q` is the flow rate (m³/s), - `c` is the specific heat capacity of water (approximately 4200 J/kg°C), - `ΔT` is the temperature difference (°C). - Substitute the known values into the formula: `P = 1000 * 0.106 * 4200 * 30 ≈ 13356000 J/s`, or approximately 13.36 MW. 4. **Check heat transfer efficiency**: - Considering that the efficiency of the heat exchanger can affect the actual heat supply, ensure that factors affecting heat transfer efficiency have been taken into account. If the heat transfer efficiency (ε) is not specified, a higher efficiency such as 90% can be used by default. - So the actual heat supply is `P_actual = ε * P`. By following the above steps, you can estimate the maximum heating capacity of the synthetic heating pump. For more accurate calculations, it is recommended to refer to the specific product manual and use on-site test data. .