Calculate Specific Heat Capacity HELP

AI Thread Summary
Calculating the specific heat capacity for refrigerant R-134a in the gas phase can be challenging, especially when considering real gas behavior rather than ideal gas assumptions. The user has data on entropy, enthalpy, and temperature but is unsure how to apply it for three phases: gas, two-phase, and liquid. They seek guidance on the appropriate equations or methods to use for these calculations. The discussion emphasizes the need for starting computations to receive targeted assistance without violating forum rules against posting assignments. The user is working on this as part of their Master Thesis and is looking for practical help in thermodynamics.
bobboviking
Messages
5
Reaction score
0
Calculate Specific Heat Capacity HELP!

Hi guys,

I having big troubles with how to calculate the specific heat (cp) for refrigerant r134a i gas phase.
I think that assuming ideal gas behavior is a bad idea since this is going to be used in a actual system...

I have values of entropy, enthalpy, temperature etc for the region where the refrigerant is in gas-phase.

Please help!

Thanks in advance!

Regards,
Andreas
 
Science news on Phys.org


how would you like to give the specific problem? but just a reminder,we are not allowed to post assignments here. doing it your way first will deliver you to close answer. start the computation so everyone could help you in some parts, but not totally, get me?
 


121910marj said:
how would you like to give the specific problem? but just a reminder,we are not allowed to post assignments here. doing it your way first will deliver you to close answer. start the computation so everyone could help you in some parts, but not totally, get me?

Hi sorry for late answer. It's not an assignment it's a part of my Master Thesis. Thermodynamics is not my best field and that's why I posted this question. I need to calculate the specific heat capacity for refirgerant R-134a in three different phases; gas-phase, two-phase and liquid-phase. I havn't found any equation that can help me so I'm kind of stuck. I've got a table with enthalpy, pressure, temperature etc to help me.

Hope you understand my problem better know. Thanks in advance!
 

Thread 'Using battery energy to heat a battery…'

Problem: You’re an Uber driver with a Tesla Model 3. Today’s low: 30F, high: 65F. You want to reach a USD$ profit target in the least number of hours, but your choices could have added cost. Do you preheat the battery only when you are headed to the charging station (to increase the charging rate by warming the battery — however the battery might not be “warm enough” when your reach the charger and thus slower charging rates), or do you always “navigate to the charger” the entire day (which...
View full post »
Thread 'Is Callen right in claiming dQ=TdS for all quasi-static processes?'

Thread 'Is Callen right in claiming dQ=TdS for all quasi-static processes?'

Hello! I am currently reading the second edition of Callen's Thermodynamics and an Introduction to Thermostatistics, and I have a question regarding Callen's definition of quasi-static. On page 96, Callen says: Another way of characterizing Callen's definition is that a process is quasi-static if it traces out a continuous curve in the system's configuration space. So far it's all well and good. A little later, Callen claims that the identification of $$TdS$$ as the heat transfer is only...
View full post »

Thread 'Basic thermal energy transfer physics: Insulation value in open airways vs sealed airways'

Been around 40 years since I took basic physics in college and while I remember doing some examples of insulation values / energy conduction, I doubt I could to the math now even if I could find the formulas. I have some some corrugated plastic sheet (think of the plastic signs you see on the side of the road) that is used in bee hives. Also have some used in a green house though a bit different in dimensions than this example but the general approach should still apply. Typically, both...
View full post »

Similar threads

I Questions about my Understanding of Thermodynamics and Statistical Mechanics
Replies
2
Views
3K
Help understanding "Heat capacity"
Replies
28
Views
3K
I Cannot understand formula for molar heat capacities of an ideal gas
Replies
22
Views
3K
Heating substances in paper cups?
Replies
4
Views
3K
Is Heat Capacity Derivable for Non-Ideal Liquid Mixtures?
Replies
4
Views
1K
I Heat capacity for a real gas using the ideal gas (zero pressure) equation
Replies
32
Views
4K
I Calculation of temperature changes (heating a cube in a microwave oven)
Replies
9
Views
3K
I Estimate thickness of an object based on radiative heat flux decay curve
Replies
2
Views
2K
Specific Heat Capacity for Gas
Replies
3
Views
2K
(Specific) Heat capacity of brass at milliKelvin temperatures
Replies
5
Views
3K

Hot Threads

Recent Insights

Back
Top