Interpolating R-134a Pressure/Temp: 600Kpa/25°C

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Discussion Overview

The discussion revolves around the interpretation of pressure and temperature values for refrigerant R-134a, specifically when these values do not align in the provided tables. Participants explore the implications of given data points such as 600 kPa and 25°C, and the concept of superheating in this context.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant questions the significance of having a pressure of 600 kPa and a temperature of 25°C when the corresponding values in the tables do not match, suggesting that 600 kPa should correspond to around 21°C.
  • Another participant proposes that the refrigerant may be in a superheated state.
  • A different participant notes that the row for 25°C is blank in the superheated table, prompting a question about its meaning.
  • One participant explains that the first line in the table shows properties at the saturation temperature (Tsat) of approximately 21.58°C, and suggests interpolating between the properties at Tsat and the next available temperature of 30°C.

Areas of Agreement / Disagreement

Participants express differing views on the interpretation of the data, with some suggesting superheating while others focus on interpolation methods. The discussion does not reach a consensus on the implications of the blank row or the correct approach to the given values.

Contextual Notes

There are limitations regarding the assumptions made about the state of the refrigerant and the definitions of superheating and saturation. The discussion also highlights the need for interpolation between temperature values that are not directly provided in the tables.

jaredokie
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What does it mean when you are given a pressure and temperature of refrigerant and the values in the tables are not in the same row? Like 600 kpa and 25 degrees celsius. 600Kpa should be around 21.-- degrees.
 
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Maybe it's superheated
 
That row for 25 deg Celsius is blank in the superheated table. What does that mean?
 
The first line shows the properties at Tsat (21.58 Celsius). The next line gives the properties at T=30 Celsius. Interpolate between those.
 

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