Sanhua Brazed Plate Heat Exchangers (BPHEs)

When engineers and contractors talk about compact, high-efficiency heat transfer in refrigeration and HVAC systems, Brazed Plate Heat Exchangers (BPHEs) are consistently the first choice. Sanhua, one of the world’s foremost manufacturers of refrigeration and HVAC components, produces a comprehensive range of BPHEs that are trusted globally across chillers, heat pumps, condensing units, and industrial refrigeration. Boulton Trading Corporation, as an authorised premium distributor of Sanhua products in India, stocks and supports this range to serve OEMs, contractors, and system designers across the country.

What Is a Brazed Plate Heat Exchanger?

A Brazed Plate Heat Exchanger is a compact heat transfer device made up of a stack of corrugated stainless steel plates, vacuum-brazed together using copper or nickel as the bonding material. Unlike gasket-type plate heat exchangers, BPHEs have no seals or gaskets; the brazing process fuses the plates permanently, creating a robust, leak-resistant unit that handles high pressures and a wide range of temperatures.

The corrugated plate pattern creates a high degree of turbulence in the fluid flowing between the plates, which dramatically improves heat transfer efficiency compared to shell-and-tube designs of the same size. The result is a unit that delivers impressive thermal performance in a small, lightweight package.

Sanhua’s BPHE Range: Built for Refrigeration and HVAC

Sanhua’s BPHEs are engineered specifically with refrigeration and air conditioning duty in mind. The range covers a wide spectrum of sizes and plate counts, making them suitable for capacities ranging from small residential heat pumps all the way up to large industrial systems.

Key series in the Sanhua BPHE range include:

  • B Series: General-purpose BPHEs for evaporator, condenser, and heat recovery applications in commercial and industrial refrigeration systems.
  • BPM/BPX Series: Optimised for use as evaporators and condensers in chiller and heat pump applications, with plate geometry designed for refrigerant-to-water duty.
  • Asymmetric BPHEs: Featuring different channel volumes on the refrigerant and water sides, these units are engineered to reduce refrigerant charge while maintaining full heat transfer performance; an increasingly important factor as the industry moves toward lower-GWP refrigerants.

All Sanhua BPHEs are manufactured from AISI 316L stainless steel plates and vacuum-brazed with copper (standard) or nickel (for ammonia or other aggressive media). Connections are typically in copper or stainless steel, facilitating easy integration with existing pipework.

Technical Advantages of Sanhua BPHEs

1. High Thermal Efficiency The corrugated plate design maximises the heat transfer area per unit volume and promotes turbulent flow even at low flow rates. This allows Sanhua BPHEs to achieve high U-values, meaning a smaller unit can do the same job as a larger conventional heat exchanger — saving both space and cost.

2. Low Refrigerant Charge Sanhua’s plate geometry, particularly in the asymmetric series, is designed to minimise the refrigerant volume held within the exchanger. For systems transitioning to A2L or A3 refrigerants such as R32, R290, or HFO blends, reducing the refrigerant charge is not just a cost benefit — it is a safety and regulatory requirement.

3. High-Pressure Capability Sanhua BPHEs are rated for working pressures that accommodate modern high-pressure refrigerants including R410A, R32, and R134a. This makes them suitable for use in both evaporator and condenser positions in systems operating at elevated pressures.

4. Wide Temperature Range Operating temperatures typically span from −195°C up to +200°C depending on the brazing material, making Sanhua BPHEs applicable across low-temperature industrial refrigeration, standard comfort cooling, and high-temperature heat recovery applications.

5. Compact and Lightweight Compared to shell-and-tube alternatives, BPHEs are significantly smaller and lighter for equivalent duty. This reduces installation complexity, lowers structural support requirements, and makes them ideal for rooftop, ceiling-mounted, or space-constrained plant rooms.

6. Durability and Leak Integrity The vacuum brazing process eliminates gaskets entirely, removing the primary source of leaks and maintenance requirements in conventional plate heat exchangers. Sanhua BPHEs are suitable for long service lives with minimal intervention, provided the system is correctly commissioned and water quality is maintained.

Where Are Sanhua BPHEs Used?

The flexibility of the Sanhua BPHE range means they appear in a wide variety of HVAC and refrigeration applications:

  • Comfort Cooling: serving fan coil units and air handling units as part of central chilled water plants in data-centres, offices, hotels, hospitals, and retail spaces.
  • Water-cooled chillers: as evaporators (refrigerant-to-water) and as condensers in water-cooled configurations
  • Air-to-water and water-to-water heat pumps: for heating and cooling duty, including domestic hot water generation
  • Condensing units: as oil coolers or desuperheaters
  • Geothermal systems: handling glycol-to-refrigerant or glycol-to-water circuits
  • Industrial refrigeration: including cold storage, food processing, and blast freezing
  • Swimming pool heating and district cooling: where efficient water-to-water heat transfer is required
  • Heat recovery systems: capturing waste heat for process or domestic use

Selecting the Right Sanhua BPHE

Choosing the correct BPHE involves matching the unit to the system’s thermal duty, flow rates, pressure levels, and refrigerant type. Key parameters that need to be defined include:

  • Capacity (kW): the total heat transfer load
  • Refrigerant type: to confirm compatibility and optimal plate geometry
  • Evaporating and condensing temperatures: to establish the required LMTD (Log Mean Temperature Difference)
  • Flow rates and pressure drop limits: on both the refrigerant and secondary fluid sides
  • Connection sizes: to match existing pipework

Sanhua provides selection software and engineering data that supports accurate sizing. Getting the selection right is important: an undersized BPHE will compromise system performance, while an oversized unit increases cost and can lead to poor flow distribution and reduced efficiency.

How Boulton Trading Corporation Supports Sanhua BPHE Users

With over 77 years of expertise in India’s HVAC & Refrigeration industry, Boulton Trading Corporation is well-positioned to assist engineers and contractors in selecting and sourcing the right Sanhua BPHE for their projects. We stock a range of standard BPHE sizes for immediate availability and can source specialised configurations to meet project-specific requirements.

Our team can assist with:

  • Application review: matching the BPHE to the specific duty and system configuration
  • Selection support: working through capacity, temperatures, flow rates, and pressure drop requirements
  • Refrigerant compatibility guidance: especially important for projects involving newer low-GWP refrigerants
  • After-sales support: technical advice on commissioning, water treatment requirements, and maintenance

Whether you are designing a new chiller package, retrofitting an existing system, or specifying components for an OEM build, Sanhua BPHEs available through Boulton Trading Corporation offer the combination of proven performance, compact design, and long-term reliability that demanding applications require.

To discuss your project requirements or check product availability, contact the Boulton Trading Corporation team in Mumbai or at any of our branch offices across Delhi, Ahmedabad, Chennai, Bengaluru, Kolkata, Hyderabad, and Pune.

Boulton Trading Corporation — Authorised Premium Distributors of Sanhua Products in India. Mumbai HQ | +91-99200 29150 | www.boultontrading.com