Sanhua SD-38 Microchannel Heat Exchanger (Condenser) | 2293 × 1008 mm | 50-145 kW (R410A) | 45 bar

Sanhua SD-38 is a large, 100% aluminum microchannel condenser coil from the Sanhua MCHE (Micro-Channel Heat Exchanger) standard series. It is a 2293 × 1008 mm single slab (1 bank) design with 106 flat tubes and 2 passes. It is much more compact and lighter than a conventional copper-aluminum condenser; the all-aluminum (AA3003) body eliminates galvanic corrosion, while the inlet/outlet tubes are copper for field brazing. With R410A it provides ~50 - 145 kW heat rejection (ΔT=20K) depending on air velocity and temperature difference (ΔT); under ΔT=30K conditions it reaches up to 223 kW.

Large Aluminum Microchannel Condenser

In the SD series, the coil gets larger as the number increases; the SD-38 is one of the high-capacity models at the top end of the series (SD10-SD41). It has a single slab design consisting of fins + flat tubes + end manifolds; the manifold diameter is Ø26 mm, the fin density is 23 FPI and the fin height is 8.1 mm. The total internal volume is 3.072 liters, requiring a much smaller refrigerant charge than a conventional condenser. It is PED Cat. I and UL 207 approved.

Technical Specifications

• Brand / Model: Sanhua / SD-38 (internal nomenclature 20.6-FPI23-2G)
• Type: Microchannel condenser coil (MCHE), single slab
• Outer Dimensions: Length (L) 2293 mm · Height (H) 1008 mm · Depth (cD) 20.6 mm
• Active Heat Exchanger Area: L1 2241 × H1 1007 mm · face area 2.26 m²
• Manifold: Ø26 mm · Fin: 23 FPI, fin height 8.1 mm, fin pitch 1.1 mm
• Tubes: 106 flat tubes (height 1.3 mm) · 1 bank · 2 passes · distribution 75/31
• Connection: Inlet ID Ø12.7 mm (1/2") · Outlet ID Ø9.52 mm (3/8") — copper tubes
• Internal Volume: Total 3.072 L (coil 2.3452 + manifold 0.7272)
• Pressure: Max. working 45 bar (4.5 MPa) · Burst 135 bar (13.5 MPa)
• Temperature Range: -40 / +121°C · Weight: ~20.3 kg (20.332 kg)
• Material: Tubes long-life aluminum alloy (LLA) · Fins / side plates AA3003 · Manifold AA3003/AA3005 · Inlet-outlet tubes copper
• Approvals: PED Cat. I (2014/68/EU) · UL 207
• Compatible Refrigerants: R410A, R404A, R407C, R134a, R22, R290, R507

Heat Rejection Capacity (air velocity 1 - 4.5 m/s)

Capacity depends strongly on air velocity and the condensing-air temperature difference (ΔT). Official Sanhua data (ΔT = condenser-air temperature difference):

• R410A: ΔT=10K ~25-72 kW · ΔT=20K ~50-145 kW · ΔT=30K ~76-223 kW
• Example (ΔT=20K, 2.5 m/s air): R410A 101 kW · R507 95 kW · R404A 94 kW · R290 93 kW · R407C 81 kW · R134a 81 kW

Technician Tips

• Connections are copper: Since the inlet/outlet tubes are copper, they are connected to the field tubing with normal brazing — no aluminum brazing is needed. However, the coil body is aluminum; a hole/crack in the body requires special aluminum welding and is often not economical.
• Capacity depends on air velocity: The same coil gives ~50 kW at 1 m/s for ΔT=20K but ~145 kW at 4.5 m/s; select your fan airflow according to the target heat rejection value.
• It is a large and heavy coil (~20.3 kg, 2.3 m long); verify the load capacity and vibration isolation of the mounting frame.
• As a condenser, mount it vertically (or tilted at least 15° from horizontal) with the inlet connection at the top; clean the fin surface with low-pressure air/water in the fin direction.
• Take care not to crush the flat tubes/fins during transport and installation — a small hole makes the coil unusable.