clint84

24-07-2013, 06:31 AM

Hi,

I'm new to this forum and I have a question about the specific heat of R134a during the condensing phase in the refrigeration cycle.

I am currently trying to assess the impact of increasing seawater inlet temperature (as cooling medium) on the cooling capacity (Q) of the Chilled water plant. I have estimates for mass flow but i can't find a figure for specific heat for R134a at 70 deg C as it enters the SW condenser. So far i have only found the specific heat of R134a at 0 deg C saturation which is 1.34 kJ/kg.K.

Secondly, this may be a silly question but would I be correct in assuming that the specific heat of R134a changes as it condenses at 40 deg C at constant pressure as an example. How do you account for the temperature glide as the refrigerant is superheated at 70 deg, condenses at 40 deg, and then is sub cooled at 30 deg C???

Sorry so many questions but i would appreciate if someone could help me out. :)

Cheers

Clint

I'm new to this forum and I have a question about the specific heat of R134a during the condensing phase in the refrigeration cycle.

I am currently trying to assess the impact of increasing seawater inlet temperature (as cooling medium) on the cooling capacity (Q) of the Chilled water plant. I have estimates for mass flow but i can't find a figure for specific heat for R134a at 70 deg C as it enters the SW condenser. So far i have only found the specific heat of R134a at 0 deg C saturation which is 1.34 kJ/kg.K.

Secondly, this may be a silly question but would I be correct in assuming that the specific heat of R134a changes as it condenses at 40 deg C at constant pressure as an example. How do you account for the temperature glide as the refrigerant is superheated at 70 deg, condenses at 40 deg, and then is sub cooled at 30 deg C???

Sorry so many questions but i would appreciate if someone could help me out. :)

Cheers

Clint