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1. Calculation formula for flow rate of hot water return circulation pump
There are two main methods for calculating the flow rate of hot water return circulation pump: accurate calculation based on building heat load and rapid estimation based on building area. 1. Calculating based on the heat load of the building is a more accurate calculation method, and its core attack formula is Q=(K × Q ₕ)/(c × Δ t). Q represents the flow rate of the circulating pump, measured in cubic meters per hour (m ³/h). K is the safety factor, usually ranging from 1.05 to 1.1, used to consider unforeseen factors such as heat loss that may exist in pipeline systems. Q ₕ is the rubber like heat load of the entire building, measured in kilowatts (kW). This value needs to be professionally calculated based on parameters such as building envelope structure, indoor and outdoor design temperature difference, and building area. C is the specific heat capacity of water, which is a fixed constant of 4.187 kJ/(kg ·℃). Δ t is the temperature difference between the supply and return water of the heating system, measured in degrees Celsius (℃). In hot water heating systems, this temperature difference is usually designed to be between 10 ℃ and 25 ℃. 2. Estimation based on building area is a simplified estimation method suitable for the preliminary scheme stage of the project, with the formula Q=q × A. • Q is also the flow rate of the circulating pump (m ³/h). Q is the circulating flow index per unit building area, measured in cubic meters per hour per square meter (m ³/(h · m ²)). For common residential buildings, the empirical range for this value is generally between 0.001 and 0.002 m ³/(h · m ²). The values for different types of public buil
2. How to calculate the flow rate of a circulating pump
1. The label in the above figure shows the standard parameters of the electric motor. Without knowing the specifications and models of the supporting water pump, even if the power, current, speed, efficiency, and other conditions of the motor are known, the flow rate of the circulating pump cannot be calculated.
.2、 If it is the flow rate of the running water pump, the corresponding actual flow rate can be found from the working point of the water pump characteristic curve, that is, the outlet pressure indicated by the pressure gauge, based on the water pump characteristic curve chart or hall (as shown in the figure below).
3. How to calculate the flow rate of a circulating pump
The formula for calculating the flow rate of a circulating pump is: Q=V × A. Among them, Q represents the flow rate, V represents the flow rate of the circulating pump, and A represents the cross-sectional area of the pipeline.
. The specific explanation is as follows: Determine the flow rate V of the circulating pump. This depends on the design of the pump and the specific scenario in which it is used. Circulating pumps with different skin types have specific flow rate ranges, which can be obtained by referring to the pump specification sheet or data provided by the manufacturer. This flow rate is usually expressed in units of hours, days, or other time units. Calculate the cross-sectional area A of the pipeline. The cross-sec