Why is the equivalent value of steam energy lower than its lower heating value?
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In the SH3110-2001T standard for calculating energy consumption in petrochemical design, the equivalent value of steam energy is as follows: 2303 MJ/t for steam at pressures below 0.3 MPa, and 3182 MJ/t for steam at 1.0 MPa. Meanwhile, according to the GB 2589-2008-T standard for general rules regarding the calculation of comprehensive energy consumption, the average lower heating value of low-pressure steam is 3763 MJ/t; this lower heating value is actually higher than the energy equivalent value. Why is this? If anyone knows, please let me know. Thank you! !
The lower calorific value refers to the energy released when it is converted into a low-temperature medium state. So it is normal for it to be higher than the high calorific value.
Is the value of 3182 MJ/t (for steam at 1.0 MPa) specified in \"SH3110-2001T: Methods for Calculating Energy Consumption in Petrochemical Design\" the high calorific value?
1. The pressure specified in \"SH3110-2001T Method for Calculating Energy Consumption in Petrochemical Design\" is a range value, and the fluid is in a superheated state. 2. \"SH3110-2001T Method for Calculating Energy Consumption in Petrochemical Design\" has been revoked and replaced by GB/T 50441-2016； GB/T 2589-2008 does not specify the enthalpy corresponding to steam, and this standard has also been updated to GB/T 2589-2008. The heat enthalpy value should be calculated by referring to the steam and pressure parameters corresponding to the steam