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2018

Methods and formulas for selecting and calculating plate heat exchangers

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(1) Calculate the heat load Q Q=G·ρ·CP·Δt (2) Calculate the inlet and outlet temperatures of the hot and cold fluids t2=t1+ Q/G·ρ·CP (3) Calculate the flow rate of the hot and cold fluids G=Q/ρ·CP·(t2-t1) (4) Calculate the average temperature difference Δtm Δtm=(T1-t2)-(T2-t1)/In(T1-t2)/(T2-t1) or Δtm=(T1-t2)+(T2-t1)/2 (5) Select the plate type. If all plate types are selected, proceed with the result analysis. (6) By K

(1) Calculate heat load Q

Q = G · ρ · CP · Δt

(2) Calculate inlet and outlet temperatures of hot and cold fluids

　　　 t2 = t1 + Q / G · ρ · CP

(3) Flow rate of hot and cold fluids

　　　 G = Q / ρ · CP · (t2 - t1)

(4) Calculate the mean temperature difference Δtm

Δtm = (T1 - t2) - (T2 - t1) / ln(T1 - t2) / (T2 - t1) or Δtm = (T1 - t2) + (T2 - t1) / 2

(5) Select plate type

If all plate types are selected, proceed to result analysis.

(6) Calculate the range of plate numbers Nmin, Nmax based on K value range

Nmin = Q / Kmax · Δtm · FP · β

Nmax = Q / Kmin · Δtm · FP · β

(7) Choose the number of plates N (Nmin ≤ N ≤ Nmax)

If N has reached Nmax, do (5).

(8) Choose the flow combination form of N, if the combination form is completed, do (7).

(9) Calculate Re, Nu

Re = W · de / ν

Nu = a1 · Rea2 · Pra3

(10) Calculate a, K heat transfer area F

　 a = Nu · λ / de

K = 1 / (1/ah + 1/ac + γc + γc + δ/λ0)

　　　 F = Q / K · Δtm · β

(11) Calculate the required number of plates NN from the heat transfer area F

　　　 NN = F / Fp + 2

(12) If N < NN, do (8).

(13) Calculate pressure drop Δp

　　 Eu = a4 · Rea5

Δp = Eu · ρ · W2 · ф

(14) If Δp > Δ允, do (8);

If Δp ≤ Δ允, record the result, do (8).

Note: 1. (1), (2), (3) are calculated based on known conditions.

2. When T1 - t2 = T2 - t1, use Δtm = (T1 - t2) + (T2 - t1) / 2

3. The correction factor β is generally 0.7 to 0.9.

4. The pressure drop correction factor ф, single flow ф = 1 to 1.2, double flow, triple flow ф = 1.8 to 2.0, quadruple flow ф = 2.6 to 2.8.

5. a1, a2, a3, a4, a5 are constant coefficients.

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+86-23-63521288

+86-23-63521388

+8613500387128

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Chongqing Southwest Saiwell Heat Exchange Equipment Co., Ltd.

Specializing in the research, development, production and sales, equipment consulting, maintenance, and accessory services of heat exchange technology, equipment, and systems, and undertaking the design and installation of thermal system engineering, energy conservation and emission reduction, and energy conservation and emission reduction system engineering.

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