Boiler Feed Water Enthalpy Calculator

Creating a comprehensive table for boiler feed water enthalpy involves understanding various parameters that affect enthalpy, such as temperature, pressure, and phase (liquid or vapor). Below is a general overview of key concepts and a sample table containing enthalpy values for water at different temperatures and pressures.

Key Concepts

1. Enthalpy (h): A measure of the total energy of a thermodynamic system, often expressed in kJ/kg.
2. Specific Enthalpy: The enthalpy per unit mass of a substance, typically expressed in kJ/kg.
3. Saturated Liquid and Vapor: The state of water at which it is about to change from liquid to vapor (saturation temperature) at a specific pressure.
4. Subcooling: Liquid water at temperatures below the saturation temperature for a given pressure.
5. Superheating: Vapor water at temperatures above the saturation temperature for a given pressure.

Boiler Feed Water Enthalpy Table

Below is a sample enthalpy table for water at various temperatures and pressures:

Temperature (°C)	Pressure (MPa)	State	Specific Enthalpy (kJ/kg)
0	0.0	Liquid	0.0
25	0.0	Liquid	104.83
50	0.0	Liquid	209.83
75	0.0	Liquid	279.83
100	0.1	Saturated Liquid	419.04
100	0.1	Saturated Vapor	2676.2
120	0.2	Saturated Liquid	504.73
120	0.2	Saturated Vapor	2825.5
150	0.4	Saturated Liquid	632.8
150	0.4	Saturated Vapor	3033.1
180	0.6	Saturated Liquid	751.2
180	0.6	Saturated Vapor	3215.6
200	0.9	Saturated Liquid	849.1
200	0.9	Saturated Vapor	3383.1
250	1.6	Saturated Liquid	1061.4
250	1.6	Saturated Vapor	3937.2
300	3.1	Saturated Liquid	1287.8
300	3.1	Saturated Vapor	4600.0

Notes

• Pressure: The table includes values for varying pressures (in MPa) to indicate the effect on enthalpy.
• State: Indicates whether the water is in a liquid or vapor state, as enthalpy values will vary accordingly.
• Specific Enthalpy Values: These are based on standard values and may vary slightly depending on the source.