Plate Heat Exchanger Efficiency Calculation

T 1 t 2 t 1 t 2 what if the outlet temperatures are unknown.

Plate heat exchanger efficiency calculation. Plate heat exchanger sizing 2 1 step 1. Heat transfer coefficient u kcal h m c. In the analysis of heat exchangers it is often convenient to work with an overall heat transfer coefficient known as a u factor the u factor is defined by an expression analogous to newton s law of cooling. Heat exchangers are commonly used in industry and proper design of a heat exchanger depends on many variables.

Heat recovery efficiency classification of heat recovery efficiency temperature efficiency moisture efficiency and enthalpy efficiency online heat exchanger efficiency calculator. Guess outlet temperatures 2. Typical velocities in plate heat exchangers for waterlike fluids in turbulent flow are 0 3 0 9 m s but true velocities in certain regions will be higher by a factor of up to 4 due to the effect of the geometry of the plate design. μ t temperature transfer efficiency.

λ thermal conductivity η viscosity c p specific heat subscription w wail. T 1 temperature in outside make up air before the heat exchanger o c o f t 2 temperature in outside make up air after the heat exchanger o c o f. A balanced counter flow heat exchanger has a surface area of 20 m2 and overall heat transfer coefficient of 20 w m2 k. They will also calculate the number of tubes needed for a shell and tube heat exchanger and to calculate the pipe length needed for a double pipe heat exchanger.

2 2 step 2. Calculate the performance of a given heat exchanger. Overall heat transfer coefficient calculate overall heat transfer coefficients for walls or heat exchangers. 2 3 step 3.

Calculate the required heat flux. Confirmation of the heat. The temperature transfer efficiency for an heat recovery unit can be calculated as. Get the design data.

Air cp 1000 j kg k entering at 0 4 kg s and 280 k is to be preheated by the air leaving the system at 0 4 kg s and 300 k. Heat load theta and lmtd calculation. Heat exchanger analysis heat exchanger calculation. Calculating the number of plates required.

μ t t 2 t 1 t 3 t 1 1 where. H for plate heat exchanger is often in between 2 to 7 kw m2 k 1. Morrison michigan tech u. Calculate outlet temperature for hot and cold stream for given flowrates inlet temperature specific heat area of the exchanger and overall heat transfer coefficient u exchanger type heat exchanger area a m.

The heat load of a heat exchanger can be derived from the following two formulas. Calculate the required heat transfer area based on values needed.