I was going through properties of refrigerant R134a ,from different sources ,I found at the same saturation pressure and temperature ,enthalpy and other parameters were varying too much in the two different sources. Why ?
R134a is a pure substance (CH2FCF3). The properties should be consistent. Two primary sources are ASHRAE and NIST. I have attached both in this spreadsheet. This book (Thermodynamic and Transport Properties of Fluids) will be free tomorrow (10/7) https://read.amazon.com/kp/embed?asin=B07Q5L1CHT&preview=newtab&linkCode=kpe&ref_=cm_sw_r_kb_dp_9B0F20GYBXBZD4FWNDN2
Because of references. Consider two points difference must be same.
Cem makes a good point. The reference should be the liquid at the triple point or normal boiling point but this is not always the case. It's easy to shift one reference to the other in an Excel spreadsheet.
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