How do you calculate the temperature of a heat exchanger outlet?
The main basic Heat Exchanger equation is:
- Q = U x A x ΔTm = The log mean temperature difference ΔTm is:
- ΔTm = (T1 – t2) – (T2 – t1)
- = °F. Where:
- T1 = Inlet tube side fluid temperature; t2 = Outlet shell side fluid temperature;
- ln (T1 – t2) (T2 – t1)
What is inlet and outlet temperature?
An inlet air temperature of 130°C and 65°C as the outlet air temperature maintained high survival of the bacteria without sacrificing low moisture content. Inlet air temperature, previously considered to have no significant effect, was shown to play an important role in the survival of bacteria during spray drying.
What will be the heat capacity ratio of a heat exchanger when one fluid changes it phase?
When a fluid changes phase, the capacity ratio becomes zero and hence the Effectiveness of heat exchanger comes out to be same for parallel and counter. Therefore no use of direction of flow.
Can the outlet temperature of the cold fluid be higher than the outlet temperature of the hot fluid in counter flow heat exchanger?
Figure 1-2. Temperature profiles in (a) counter-flow and (b) parallel flow single pass heat exchangers. Note that in a counter-flow heat exchanger the outlet temperature of the cold fluid can exceed the outlet temperature of the hot fluid but this cannot happen in a parallel flow system.
Can the temperature of the hot fluid drop below the inlet temperature of the cold fluid at any location in a heat exchanger?
No, The heat transfer in a heat exchanger will reach its maximum value when the hot fluid is cooled to the inlet temperature of the cold fluid. Therefore, the temperature of the hot fluid cannot drop below the inlet temperature of the cold fluid at any location in a heat exchanger.
Which is better parallel flow or counterflow?
Counter flow heat exchangers are inherently more efficient than parallel flow heat exchangers because they create a more uniform temperature difference between the fluids, over the entire length of the fluid path. For example, one fluid may make 2 passes, the other 4 passes.
How do you calculate fin effectiveness?
The fin efficiency is defined by the division of the actual by the theoretical heat transfer, that is, (9.35) (9.36) The actual heat flow is calculated by multiplying the fin outer surface area by the fin efficiency.
What is the effect of thermal conductivity of fin effectiveness?
10a-d shows that the fin efficiency decreases monotonically (for different thermal conductivity and at a constant heat transfer coefficient) with increasing thermogeo- metric parameter. Also, it shows the variation of fin efficiency with thermogeometric in longitudinal convecting fin with insu- lated tip.