jamesjd said:t = s/v = 5 seconds
m = t/flow rate = 2.5kg
Borek said:Ejection speed is not necessarily the speed at which water travels up. Besides, time you have calculated doesn't matter - each second you have to move 2 kg of water 50 meters up.
jamesjd said:Is it not 10m? erm is the calculation Mass = flow rate/ time?
To be brutally honest, no. You have not followed Borek's advice. I'll repeat it, highlighting the key concept:jamesjd said:Was any of my working correct?
How much energy is needed to lift one kilogram of water 50 meters?Borek said:You need to do two things - transfer water up, and accelerate it to 10 m/s. Calculate energies involved.
D H said:How much energy is needed to lift one kilogram of water 50 meters?
How much energy is needed to make that one kilogram of water move at 10 meters/second?
micuklein said:2*9.81*50=981 Js-1
To calculate the horsepower for pumping water from 50m depth, you will need to know the flow rate of the water in meters per second and the efficiency of the pump. The formula for calculating horsepower is: Horsepower = (Head x Flow rate x Specific gravity) / (3960 x Efficiency). In this case, the head would be 50m, the flow rate would be 10m/s, and the specific gravity would be 1 (for water). The efficiency of the pump can vary, but a typical value is around 70-80%.
The specific gravity of water is a measure of its density compared to the density of pure water at 4 degrees Celsius. It is typically given a value of 1, but this can vary slightly depending on temperature and impurities in the water.
To convert meters per second to feet per minute, you can use the conversion factor of 196.85. This means that for every meter per second, there are approximately 196.85 feet per minute. So for a flow rate of 10m/s, the equivalent in feet per minute would be approximately 1968.5 fpm.
The efficiency of a pump can vary depending on the type and size of the pump, as well as the conditions it is operating under. However, a typical efficiency for a pump can range from 70-80%. This means that 70-80% of the energy put into the pump is converted into useful work, while the rest is lost as heat or other forms of energy.
No, horsepower is not the only factor to consider when selecting a pump. Other important factors include the type and size of the pump, the flow rate and head required for your specific application, and the efficiency and reliability of the pump. It is important to carefully consider all of these factors when selecting a pump to ensure it meets your needs and operates effectively.