The flow rate of the working fluid into the evaporative heating surface of a once-through boiler is not determined by the density difference like a natural circulation boiler, but is supplemented under the action of height pump pressure. The so-called hydrodynamic characteristics refer to the relationship between the flow rate of the working fluid G and the pressure drop ΔP in the heating surface of the once-through boiler under a certain thermal load. Figure 2 shows a simplified evaporative heating surface of a horizontally arranged once-through boiler. When a flow is flowing, there is a certain pressure drop ΔP between the inlet and outlet of the tube diagram. This pressure drop consists of three elements, P P1 P2. P1d (1) Equation Middle: P ——Pipe coil inlet and outlet pressure difference, [Pa] P1 ——Large position pressure difference, [Pa] P2 ——Pressure dropacceleration, [Pa] P1d ——Flow resistance, [Pa ] For horizontal pipes or spirals For riser tube panels, the length of the tube is much larger than the height, i.e. P1d is much larger than P1. Therefore, P1 can be ignored according to the calculations, the value of the accelerated pressure drop. P2 represents only 3.5% of the total pressure drop. It can therefore be omitted. In this way, equation (1) can be simplified as follows: P P1d ( 1 d jd ) G2 2 (2) where: λ——friction resistance coefficient d——inner diameter of the tube coil, [ m]; —loop pipe length, [m]; local resistance coefficient; 1 G - flow rate of the working fluid through the pipe loop, [Kg/s] - average specific volume of the working fluid, [m3/Kg]; .
How to design the garden and swimming pool of the villa? The main body of the swimming pool can be made of reinforced concrete. Once the waterproofing is completed, squaresCeramic waters can be laid with multi-level steps near the house. can reduce risks.
Lay a wooden platform extending from the hallway of the house, connect it to the edge of the pool and build benches for resting. You can also Baidu Five Elements Garden, where there are more swimming pools. case.
Wuxing garden villa garden design
You can also use wooden fences and climbing plants to form beautiful flower hedges, which can increase concealment without appearing too closed. Then build a wooden planter in a corner near the pool to form a landscape of climbing plants unified with the flower hedge. Next, lay grass on the flat area and plant a few small trees to add some shade. Internet link