7ramy
06-05-2008, 03:04 AM
designing an evaporator qith thermal load 30 kWatt
to cool air from 45 to 21 °c
with operating temperature of 10 °c inside tubes
temperature,pressure of refrigerant at outlet inlet is unknown
i need to calculate mass flow rate as following:
flow rate = thermal load /
enthalpy out - enthalpy in
what enthalpy values should i use
those of refrigerant ?
or of (water) saturated liquid,vapor ?
difference in enthalpy for refrigerant is much lower than those of water and it confuses me
help plz
to cool air from 45 to 21 °c
with operating temperature of 10 °c inside tubes
temperature,pressure of refrigerant at outlet inlet is unknown
i need to calculate mass flow rate as following:
flow rate = thermal load /
enthalpy out - enthalpy in
what enthalpy values should i use
those of refrigerant ?
or of (water) saturated liquid,vapor ?
difference in enthalpy for refrigerant is much lower than those of water and it confuses me
help plz