Vital to the efficiency and long life of a heat exchanger, this section looks in detail at how they operate, what 'stall' is, and the best ways of maximising your efficiency.
Heat Exchangers And Stall
Investigating how to remove condensate from heat exchangers fitted with a temperature control valve on the steam line, and a steam trapping device on the condensate line from the heat exchanger.
The Heat Load Heat Exchanger and Steam Load Relationship
The equations needed to determine the design loads and steam pressure and flowrate requirements for heat exchange applications.
Oversized Heat Exchangers
Often heat exchangers are bigger than needed for the job they need to do. This section looks at the implications of this, the effects on issues like selecting the right steam traps for them, and details the equations needed to deal correctly with this common problem.
Example Selecting The Trap
Step-by-step illustration for calculating stall and how to select the right condensate removal solution for a heat exchange application.
The Stall Chart - Constant Flow Secondary - Constant Inlet Temperature - Varying Outlet Temperature
Using this simple method, stall can be worked out for an situation with a constant secondary flowrate with a varying inlet temperature.
The Stall Chart - Varying Flow Secondary - Constant Inlet Temperature - Constant Outlet Temperature
Sometimes constant secondary flow is not required, such as providing hot water to batch processes like tank or vats. This example shows how to use the chart in these cases.
The Stall Chart - Constant Flow Secondary - Varying Inlet Temperature - Constant Outlet Temperature
In cases where constant flow is secondary, there is varying inlet temperature, and constant outlet temperature.
Practical Methods of Preventing Stall
Methods of dealing with condensate drainage problems include gravity drainage, adding an automatic pump trap device, and controlling the pressure in the steam space.