Thermodynamics question about mass flow rate in an air conditioning unit?

AI Thread Summary
In the discussion about calculating the mixed air temperature in an air conditioning unit, the scenario involves fresh air at 10°C mixed with warm air at 30°C, with a mass flow rate ratio of 1.6. To estimate the exit temperature, participants suggest using energy calculations based on specific heat, assuming constant specific heat for simplicity. There is a mention of the importance of these calculations for system design and refrigerant selection. Additionally, the question arises about the applicability of air standard assumptions in all heat engine and heat pump problems. The conversation emphasizes the need for clear methodologies in thermodynamic calculations.
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1. In an air conditioning unit fresh air at 10°C is mixed with warm air at 30°C. If the mass flowrate ratio of warm to fresh air is 1.6, estimate the temperature at which the mixed air leaves the air conditioner. State any assumptions made.


and also do you always make the air standard assumptions for ALL heat engine and heat pump problems?


my attempt was mdot/mdot = flowrate ratio = change in temperature but then I don't think that makes sense, any help?
 
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Such a correlation would aid in system design and allow the examination of a full range of refrigerant choices.


air conditioner
 
One way to do it would be to may be calculate the energy in and energy out based off the specific heat of the air.
 
Assume constant specific heat vs. temperature and it's a high school-level problem.
 

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