251--Input Data and Recommended Practices

doi:10.1615/hedhme.a.000251

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Input Data and Recommended Practices

DOI 10.1615/hedhme.a.000251

3.3.5 Input data and recommended practices

J. Taborek

In this section we deal with three subjects:

The basic set of input data as required for shell-side rating calculations, but also including those required for design of the overall exchanger, that is, including tube-side flow. These are presented in Table 1.
Detailed comments to the input data, to give guidance to the designer as to proper practices and standards.
Preliminary calculations of correlational parameters derived from the input data, as required for subsequent calculations.

Table 1 Input data required for rating of segmentally baffled shell-and-tube exchangers

Item	Symbol	Units	Description
Shell-side geometry data
Tube and tube layout
1	D_s	mm	Inside shell diameter
2	D_t	mm	Tube outside diameter
3	L_tw	mm	Tube wall thickness
4	D_ti	mm	Inside tube diameter
5	λ_tw	W/m K	Tube wall material thermal conductivity
6	L_tp	mm	Tube layout pitch
7	θ_tp	deg	Tube layout characteristic angle
Tube length (Refer to Figure 2)
8	L_to	mm	Overall nominal tube length
9	L_ti	mm	Baffled tube length
10	L_ta	mm	Effective tube length for heat transfer area
Baffle geometry (Figure 7)
11	B_c	%	Baffle cut as percent of D_s
12	L_bc	mm	Central baffle spacing
13a	L_bi	mm	Inlet baffle spacing (optional)
13b	L_bo	mm	Outlet baffle spacing (optional)
Nozzle
14	CN	code	Shell-side nozzle, impingement protection, annular distributor
Tube bundle geometry
15	N_tt		Total number of tubes or holes in tubesheet for U-tubes
16	N_tp		Number of tube passes
17	N_ss		Number of sealing strips (pairs)
18	CB	code	Tube bundle type (FX, UT, SRFH, PFH, PTFH)
19	L_tb	mm	Tube OD (D_t)-to-baffle hole clearance (diametral), Figure 12
20	L_sb	mm	Inside shell-to-baffle clearance (diametral), Figure 13
21	L_bb	mm	Inside shell-to-tube bundle bypass clearance (diametral), Figure 14

Temperatures
22	T_si	°C	Shell-side temperature inlet
23	T_so	°C	Shell-side temperature outlet
24	T_ti	°C	Tube-side temperature inlet
25	T_to	°C	Tube-side temperature outlet

Shell-side process information
26	Ṁ_s	kg/s	Shell fluid mass flow rate
At shell fluid mean temperature
27	ρ_s	kg/m³	Density
28	λ_s	W/m K	Thermal conductivity
29	(c_p)_s	J/kg K	Specific heat
30	η_s	cP = mPa/s	Dynamic viscosity (may require two values)
31	R_f,o	mK/W	Shell-side fouling resistance (referred to shell-side surface)

Tube-side process information
32	Ṁ_t	kg/s	Tube fluid mass flow rate
At tube fluid mean temperature
33	ρ_t	kg/m³	Density
34	λ_t	W/m K	Thermal conductivity
35	(c_p)_t	J/kg K	Specific heat
36	η_t	cP = mPa/s	Dynamic viscosity (may require two values)
37	R_f,i	m K/W	Tube-side fouling resistance (referred to inside tube surface)

Special information
38	α_s	W/m² K	Shell-side heat transfer coefficient; if specified, omit items as shown in comments
39	α_t	W/m² K	Tube-side heat transfer coefficient; if specified, omit items as shown in comments
40	(Δp_s)_max	kPa	Maximum permissible pressure drop, shell side
41	(Δp_t)_max	kPa	Maximum permissible pressure drop, tube side
42	(v_t)_max	m/s	Maximum permissible tube-side flow velocity (optional)
43	(v_t)_min	m/s	Minimum acceptable tube-side flow velocity (optional)

A. Basic input data

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