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__Capacity__ (delivery, flow rate) – volume of medium pumped by a pump per unit of time. It is denoted by letter Q and has dimension in m3-h, l-s, etc. Flow rate quantity includes only factual volume of displaced fluid ignoring return leakages. The theoretical and factual flow rate ratio is expressed by volumetric efficiency quantity:

Note: This information is provided as a quick reference resource and is not intended to serve as a substitute for qualified engineering assistance. While every effort has been made to ensure the accuracy of this information, errors can occur. As such, neither Flodraulic, any of its affiliated companies nor its employees will assume any liability for damage, injury or misapplication as result of using this reference guide.

### Pumps for open and closed systems

In this article we learn how to perform pump calculations in both imperial and metric units to assess pumping performance following the change of flow rate, pump speed, head pressure and power. These formulas are common practice rules of thumb and provide theoretical values to which actual values will likely differ. Please scroll down to view the video tutorial on this subject.

### How to find pump size and pump head calculation (with formulas & explanation) in plumbing design for potable water supply system?

For instance the required flow rate of a pump feeding oil into a refinery distillation column will be determined by how much product the column is required to produce. Another example is the flow rate of a cooling water pump circulating water through a heat exchanger is defined by the amount of heat transfer required.

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Every pump manufacturer provides a Head-Capacity curve or a Table that says how much water to expect from what depth for a given HP and efficiency range. Obviously deeper one installs a pump, less water it pumps. Please note that higher the HP one uses does not mean that more water is pumped out. Ideally, a pump should extract only as much water as the yield rate of the aquifer permits, so as to maintain a steady state in the pumping water level.

### Single phase circuit calculation

Essentially a pump adds energy to a system and a turbine takes it away. Therefore typically in the Bernoulli Equation the pump pressure (Pp) is added to the left-hand side of the equation and the turbine pressure (Pt) is added to the right. So for a system containing a pump and a turbine the Bernoulli equation would look something like this:

### Journal of the Optical Society of America B

This note discusses performances of air conditioning systems, including heat pumps and chillers. It describes the efficiencies of systems so you can estimate how much energy a system may use. The discussion applies equally to residential, commercial, and industrial systems.

### Step 1:Your Home

Let me say here at the beginning that you really do have to understand the following. You cannot fake it. The good news is these definitions, formulas, and rules are not complicated and they’ll allow you to troubleshoot just about any pump problem. We’ll begin with the seven definitions:

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