After finding the rate of heat transfer q, outlet temperatures for fluids warming dishes of constan

In the standard heat exchanger manufacturers usually provide enough information about the performance of these devices. And if we work with conventional devices (tubular or plate) find free tools to calculate your benefits. Proprietary software allows us to calculate warming dishes many things in all kinds of exchangers but you have to buy it. That is why if we design special systems exchange heat as required for many conventional applications we will not a problem.
When heat is transferred from one fluid to another (through a solid surface separation) flowing through a heat exchanger, the temperature difference Dt varies locally along the flow path. The heat transfer rate can be calculated using:
Dt where Dt 1 and 2 are the temperature differences between the fluid and each of the ends of the heat exchanger; warming dishes Dt m is the logarithmic mean temperature difference (LMTD). For the special case Dt Dt 1 = 2 (with possibly only a heat exchanger with equal capabilities), leading to an uncertainty in the above equation m = t Dt Dt 1 = 2.
The calculations using the above equations to Dt m are convenient when the inlet and outlet temperatures are known in both fluids. Often, the temperatures of the fluid leaving the exchanger are unknown. To avoid the trial and error calculations, NTU Effectiveness (ε) uses three dimensionless parameters: ε effectiveness, number of transfer units (NTU) and rate ratio cr capacity; the average temperature warming dishes difference is not needed.
Effectiveness of heat exchanger ε is the ratio between the maximum rate of heat transfer possible warming dishes in a counterflow heat exchanger of infinite surface area with the same mass flow rates and inlet temperatures. The maximum heat transfer rate possible for arriving at hi hot fluids and cold fluid entering at ci is:
O with a given type of heat exchanger, the effectiveness of a heat exchanger can be expressed as a function of NTU (number of transfer units) and the ratio of capacity rate cr.
The effectiveness is independent of the inlet temperature of the exchanger. For any heat exchanger where cr is zero (where one fluid undergoes a phase change, such as a condenser or evaporator, has an effective cp = ), the effectiveness is:
After finding the rate of heat transfer q, outlet temperatures for fluids warming dishes of constant density are already Weighted equations (see bibliography). Some examples of the equations used to compute the effectiveness of a heat exchanger, N = NTU are:
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