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Heat Exchanger Selection Guide | YONGFAN
Thermal Programs & Hydraulic Architectures

Heat Exchanger Selection: Temperatures, Load & Fluid Metallurgy

Heat exchanger selection starts with the temperature program, heat duty, fluid condition and hydraulic limits — not with nominal connection size or a single MW value.

Compare YONGFAN gasketed plate heat exchangers (BR series), packaged heat-exchange skids (ZS/ZW), JFSW double-thread turbulent tube exchangers, U-tube storage units, floating coil exchangers, and high-rise direct-mixing heating units per GB150 and GB151 standards.

PHE Scope 4–900 m³/h · 0.2–500 m²
Approach Temp Down to ~1°C Counterflow
Packaged Units 0.21–21 MW (ZS / ZW Skids)
Pressure Classes 1.0 / 1.6 / 2.5 MPa Hydro QA
Request Heat Exchanger Selection Review 10-Step Guide
Gasketed plate heat exchanger and district heating plant room skid
Thermal & Hydraulic Engineering Four Terminal Temperatures, Allowable ΔP, Metallurgy (316L/Ti/Hastelloy) & Storage Buffering
01 / Engineering Methodology

A Heat Exchanger Can Match the Load and Still Be the Wrong Choice

Two projects both requiring 1 MW of heat transfer can need completely different equipment: a compact gasketed PHE for clean closed loops, a tube bundle for steam, or a storage vessel for morning hotel DHW peaks.
District heating heat exchanger station and circulation pumps
Thermal Standards

GB150 & GB151 Code Compliance

Per pressure vessel standards, heat exchangers are calculated from log mean temperature difference (LMTD), primary/secondary hydraulic pressure limits, fluid chloride chemistry, and mechanical maintenance clearances.

Missing the Four Terminal Temperatures

Specifying only “Primary water 95°C” without confirming primary return and secondary supply/return prevents calculating thermal driving force (LMTD).

Impact: Severe surface under-sizing or over-sizing

Chloride Stress Pitting on 304 Stainless

Defaulting to standard 304/316 stainless plates on high-chloride well water or geothermal brine causes pinhole perforations within months of startup.

Impact: Cross-contamination & unscheduled shutdown

Peak DHW Demand vs Instantaneous Sizing

Sizing instantaneous plate exchangers for brief morning hotel shower surges requires massive boilers; storage heat exchangers buffer peak loads efficiently.

Impact: Unnecessary boiler oversizing & high cost

Direct Mixing Without Hydraulic Separation

Using direct-mixing units where high/low heating zones require independent water qualities or pressure isolation eliminates necessary physical barriers.

Impact: Over-pressurization of low-zone radiators

The Ten Sizing Milestones

Follow a structured thermal and hydraulic evaluation before freezing equipment model numbers:

01 Four Terminal Temperatures (T1, T2, t1, t2)
02 Heat Duty (kW/MW) & Both Circuit Flow Rates
03 Allowable ΔP (Primary & Secondary Sides)
04 Metallurgy (304 / 316L / Titanium TA1 / Hastelloy)
02 / Thermal Architectures

Choosing the Right Heat Transfer Architecture

Compare YONGFAN gasketed plate exchangers, packaged district skids, turbulent tube units, storage exchangers, and direct-mixing units.
Architecture 01 · BR Series Compact Indirect · 4 to 900 m³/h · 0.2 to 500 m²

Gasketed Plate Heat Exchangers: High Thermal Intensity

The benchmark for compact liquid-to-liquid heat transfer. Corrugated chevron plates induce intense turbulence, achieving high heat transfer coefficients with approach temperatures down to ~1°C in counter-flow.

Capacity Scope: 4 to 900 m³/h, DN15 to DN250, plate area 0.02 to 1.3 m²/plate, assembled area 0.2 to 500 m². Design pressures: 1.0 / 1.6 / 2.5 MPa, design temperature up to 170°C (recommended ≤150°C continuous).
Metallurgy: Plates in 304, 316, 316L, 321, 316Ti, Titanium TA1 (high chlorides), Hastelloy, and RS-2 alloy. Gaskets in EPDM, NBR, FKM fluororubber, and silicone. BRb wide-gap free-flow models available for fibrous fluids.

Flow & Port Sizes
4 – 900 m³/h · DN15 to DN250 connections
Heat Transfer Area
0.2 – 500 m² assembled transfer area
Plate Metallurgy
SUS304 · 316L · Titanium TA1 · Hastelloy · RS-2
Pressure Classes
1.0 / 1.6 / 2.5 MPa (Hydro tested at 1.25× design)
Service Clearance: Always preserve axial frame opening clearance equal to the plate pack length to allow maintenance staff to slide and inspect plates.
View Plate Exchangers Request PHE Sizing
Gasketed plate heat exchanger with titanium plates in district heating plant
BR Series Gasketed Plate Heat Exchanger
Ideal When:
  • Plant room footprint is restricted
  • Close approach temperature (1–3°C) is required
  • Future thermal expansion may add plate count
  • Fluid requires Titanium or Hastelloy metallurgy
Architecture 02 · Packaged Unit Integrated Skid · 0.21 to 21 MW · 3,000 to 300,000 m²

Packaged Plate Heat Exchanger Units: Complete Plant Skids

A complete factory-assembled heat exchange station combining the plate exchanger core, secondary circulation pumps, make-up system, valves, sensors, instruments, and PLC control panel onto one compact base frame.

Capacity Scope: 0.21 to 21 MW per unit (heating reference 3,000 to 300,000 m²). Serves saturated steam (0.4 MPa) or hot water (95/70°C) primary sources. Delivers radiator programs (60/85°C) or floor heating/AHU programs (45/55°C).
Make-Up Architectures: ZS (variable-frequency make-up pumps) and ZW (pressure-stabilizing expansion tank make-up).

Thermal Scope
0.21 – 21 MW (3,000 – 300,000 m² heating reference)
Primary Sources
Saturated steam (0.4 MPa) · Hot water (95/70°C)
Make-Up System
ZS (VFD make-up) · ZW (Expansion tank make-up)
Automation
Outdoor reset curve · Modbus/BACnet BMS integration
Procurement Scope: Packaged units eliminate field piping coordination between separate pumps, valves, and exchangers, approved on a single unified skid drawing.
View Packaged Units Request Skid Proposal
Packaged plate heat exchanger unit skid with circulation pumps and control cabinet
Packaged Plate Heat Exchanger Skid
Skid Components:
  • Plate heat exchanger core with thermal insulation
  • Primary/secondary variable speed circulation pumps
  • ZS/ZW make-up water & pressure expansion system
  • PLC control panel with outdoor temperature reset
Architecture 03 · JFSW / U-Tube / Floating Coil Steam Duty · DHW Peak Storage Buffering

Turbulent Tube, U-Tube Storage & Floating Coil Exchangers

Tube-type and storage heat exchangers solve steam-to-water applications, scaling water conditions, and domestic hot water peak demand profiles.

JFSW Double-Thread Turbulent HX: 0.35 to 5.6 MW, double-thread copper or stainless tubes that disrupt boundary layers for high heat transfer and anti-scaling.
U-Tube Storage HX: 100 to 15,000 L vessel, 10 kW to 10 MW. Flanged bundle withdraws completely for physical inspection and manual descaling.
Floating Coil HX: 100 to 15,000 L, 21–1,045 kW steam / 10–523 kW water. Thermal coil flexing sheds scale automatically; ideal for hard water and solar/heat pump loops.

JFSW Tube Scope
0.35 – 5.6 MW · 0.2 MPa steam · Double-thread tubes
U-Tube Storage
100 – 15,000 L · Withdrawable bundle · to 2.5 MPa
Floating Coil Storage
100 – 15,000 L · Thermal movement scale shedding
Direct-Mixing Unit
0.14 – 4.2 MW · 20–60 m elevation high-rise zoning
U-Tube vs Floating Coil: Choose U-tube for full bundle withdrawal access; choose floating coil for automated scale-cracking in hard water and variable heat pump inputs.
View Storage Exchangers Request Storage Sizing
Floating coil storage heat exchanger in commercial hotel hot water plant
Floating Coil DHW Storage Heat Exchanger
Key Selection Rules:
  • Size DHW storage from peak draw + recovery time
  • JFSW for open tube passages & steam duty
  • Direct-mixing for connected high-rise heating zones
  • Confirm vessel floor loading and ceiling height
03 / Selection Matrix

Heat Exchanger Family Routing Table

Cross-reference YONGFAN heat equipment families by project requirement, supplier boundaries, and the first technical confirmation input.
Project Requirement First YONGFAN Family Published Supplier Boundary First Input to Confirm Action
Compact heat transfer between two fluid circuits
Gasketed Plate Heat Exchanger
 4–900 m³/h, 0.2–500 m², 1.0/1.6/2.5 MPa, 170°C Four terminal temperatures (T1, T2, t1, t2) & fluid chemistry Configure PHE
Complete district / building heat transfer station
Packaged Plate Heat Exchanger Unit
 0.21–21 MW · ZS (VFD) / ZW (Expansion) make-up Heat source, thermal load, and skid scope Configure Skid
Tube-based steam-water / water-water duty
JFSW Double-Thread Turbulent HX
 0.35–5.6 MW · 0.2 MPa steam · Vertical/Horizontal Temperature program and tube/shell maintenance preference Configure JFSW
Storage hot water with withdrawable bundle
U-Tube Storage Heat Exchanger
 100–15,000 L, 10 kW–10 MW, up to 2.5 MPa Peak DHW draw volume and recovery time Configure U-Tube
Storage hot water with floating coil (hard water)
Floating Coil Heat Exchanger
 100–15,000 L; 21–1,045 kW steam / 10–523 kW water Water hardness and variable heat source profile Configure Coil
High-rise heating zone direct connection
Direct-Mixing Heating Unit
 0.14–4.2 MW, 20–60 m elevation difference Zone pressure relationship & hydraulic connectivity Configure Direct
04 / Procurement Protocol

Information Required for Heat Exchanger Sizing

Provide thermal program temperatures, heat load, allowable pressure drops, and water analysis to freeze plate counts and skid layouts.
STEP 01

Four Temperatures

Provide Primary Inlet/Outlet (°C) and Secondary Inlet/Outlet (°C) to establish the logarithmic mean temperature difference (LMTD).

STEP 02

Heat Duty & Flows

State total heat load (kW / MW) and flow rates (m³/h) for both primary and secondary fluid circuits.

STEP 03

Allowable ΔP Budget

Specify maximum permissible pressure drop (kPa / bar) on primary and secondary sides to optimize plate corrugation chevron angles.

STEP 04

Fluid Chemistry & Pressure

Provide chloride content (ppm), pH, operating/design pressure (1.0/1.6/2.5 MPa), and peak storage demand for DHW systems.

Engineering Handoff

18-Point Heat Exchanger Checklist

Submit your thermal balance schedule or plant room drawings. YONGFAN thermal engineers will verify plate channel velocities, LMTD margins, and metallurgy.

1. Heat Source (Steam, Hot Water, Glycol)
2. Primary Side Inlet & Outlet Temp (°C)
3. Secondary Side Inlet & Outlet Temp (°C)
4. Required Heat Duty (kW or MW)
5. Primary & Secondary Flow Rates (m³/h)
6. Allowable ΔP for Both Sides (kPa)
7. Design Pressure (1.0 / 1.6 / 2.5 MPa)
8. Fluid Chloride Content (ppm) & pH
9. Metallurgy (304, 316L, Titanium, Hastelloy)
10. Gasket Material (EPDM, NBR, FKM)
11. DHW Peak Draw (L/min) & Storage Volume
12. DHW Recovery Time (Minutes/Hours)
13. Packaged Skid Scope (ZS VFD vs ZW Tank)
14. High-Rise Direct Mixing Elevation Head (m)
05 / Manufacturing Verification

Pressure Vessel QA & Hydrostatic Testing

GB150 and GB151 pressure-vessel inspection, raw material spectrometer verification, and separate-side hydrostatic leak tests.
Hydrostatic QA

1.25× Hydrostatic Pressure Test

Every assembled heat exchanger and pressure vessel undergoes hydrostatic pressure testing at 1.25× design pressure per GB150/GB151 codes.

Cross-Leak Test

Separate-Side Leak Check

Primary and secondary channels are pressurized independently to ensure zero internal cross-leakage between fluids prior to factory release.

Material QA

Plate Metallurgy Certification

Spectrometer analysis verifies chemical composition of 316L, Titanium TA1, and Hastelloy raw coil stock to prevent corrosion failures.

Skid QA

Packaged Skid Electrical Run

Packaged skids undergo full operational testing of circulation pumps, make-up valves, pressure sensors, and control cabinet automation.

06 / Engineering Knowledge

Heat Exchanger Selection Frequently Asked Questions

Technical answers to key selection questions regarding plate vs tube, district heating, storage sizing, and direct mixing.

Which YONGFAN heat exchanger should I choose for district heating?

Use the Gasketed Plate Heat Exchanger when surrounding pumps and controls are field-engineered. Use the Packaged Plate Heat Exchanger Unit when you need a turnkey skid with pumps, make-up system, and controls.

Which family has the smallest physical footprint?

The Gasketed Plate Heat Exchanger (BR Series) provides the highest heat transfer surface area per unit volume, making it the most compact indirect transfer solution.

When should I choose JFSW instead of a plate heat exchanger?

Choose JFSW Double-Thread Turbulent HX when handling steam-water duty, when the maintenance team prefers open shell-and-tube access, or when fluids contain particulate matter prone to clogging plate channels.

Which storage heat exchanger is better for hard water?

The Floating Coil Heat Exchanger is preferred for scale-forming hard water. Thermal expansion and contraction flex the coil, automatically cracking scale from the outer tube surface.

When is the U-tube version better?

Choose the U-Tube Storage Heat Exchanger when the maintenance strategy relies on pulling the entire flanged bundle for physical cleaning, inspection, or tube replacement.

What is the difference between ZS and ZW packaged skids?

In YONGFAN Packaged Heat Exchanger Units, ZS uses variable-frequency pump make-up water, while ZW uses a pressure-stabilizing diaphragm expansion tank make-up system.

Can a direct-mixing unit replace every high-rise heat exchanger?

No. Direct mixing keeps high and low heating zones hydraulically connected. If independent water quality, physical pressure isolation, or contamination barriers are required, use an indirect PHE.

Can YONGFAN recommend plate metallurgy from water analysis?

Yes. Provide chloride content (ppm), pH, conductivity, and operating temperatures. YONGFAN engineers will specify SUS304, 316L, Titanium TA1, or Hastelloy accordingly.

07 / Application Boundaries

Heat Exchanger Scope Ends at the Nozzle Flange

Understanding system boundaries ensures clear delineation of engineering responsibilities across hydronic and thermal projects.
Boundary 01 / Primary Source

Boiler & Chiller Plant

YONGFAN manufactures exchangers and skids; central boilers, district steam generation, and chiller refrigeration loops belong to plant equipment scope.

Boundary 02 / Piping Loads

External Nozzle Stress

Connected field pipework must be independently supported; pipe thermal expansion loops must prevent transferring structural loads to exchanger nozzles.

Boundary 03 / Water Chemistry

Chemical Water Treatment

YONGFAN provides corrosion-resistant alloys; chemical dosing, corrosion inhibitor monitoring, and loop deaeration remain facility maintenance scope.

Boundary 04 / Certification

GB150 vs ASME Stamp

Standard units are manufactured and tested to GB150/GB151 codes; projects requiring ASME Section VIII or CE-PED stamps must specify requirements prior to quotation.

08 / Engineering Handoff

Request Heat Exchanger Sizing & Selection

Send your four terminal temperatures, thermal duty, fluid chemistry, and allowable pressure drop — YONGFAN application engineers will provide certified thermal calculations, dimensional drawings, and skid proposals.

Four Temperatures (T1, T2, t1, t2) Heat Duty (kW / MW) BR Gasketed Plate PHE ZS / ZW Packaged Skids 316L / Titanium TA1 / Hastelloy U-Tube / Floating Coil DHW Storage
Request Exchanger Selection Go to Selection Center Contact Technical Support
Engineers reviewing heat exchanger thermal data sheets and district heating drawings
Thermal Application Engineering
LMTD calculations, pressure loss optimization & metallurgy verification.
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