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At CSTHEATEXCHANGER, we design, engineer, and manufacture high-efficiency air exchanger units and air-to-air heat recovery cores featuring cross-flow and counter-flow plate heat exchange topologies (airflow capacities from 200 CFM/340 m3/h to over 30,000 CFM/50,000 m3/h). Engineered for commercial buildings, data centers, cleanrooms, swimming pool facilities, and industrial HVAC ventilation systems, CSTHEATEXCHANGER air exchangers deliver sensible and total enthalpy heat recovery efficiencies from 65% up to 92%+ (certified to EN 308 and AHRI 1060 standards). Utilizing precision-stamped anti-corrosive aluminum foils (with optional hydrophilic or epoxy coatings), polymeric total-heat enthalpy membranes, or welded SS304/SS316L stainless-steel plates, our units ensure Class L1 airtightness with zero cross-contamination (<0.1% internal leakage), dramatically cutting building heating and air conditioning energy loads by up to 70%.
Air exchanger units recover thermal energy from stale exhaust air to pre-heat or pre-cool incoming fresh ventilation air without mixing the two air streams.
The aerodynamic flow configuration inside the plate core governs the maximum achievable thermal efficiency:
CROSS-FLOW VS. COUNTER-FLOW AIR HEAT EXCHANGE MATRIX
A. CROSS-FLOW (90° ORTHOGONAL) B. COUNTER-FLOW (180° OPPOSITE MATRIX)
• 90° Perpendicular Air Streams • 180° Pure Counter-Current Flow
• Sensible Efficiency: 55% - 70% • Sensible Efficiency: 75% - 92%+
• Square Geometry / Compact Enclosure • Hexagonal Core / Extended Path
• Moderate Capital Cost • True Temperature Cross Capability
Fresh Air In ────────► Fresh Air Out Fresh Air In ──────►────────► Fresh Air Out
▲ ▲ ▲ ▲
│ [SQUARE CORE] │ │ [HEXAGONAL CORE] │
│ │ │ │
Exhaust In ────────► Exhaust Out Exhaust Out ◄──────◄────────◄ Exhaust In================================================================================
CSTHEATEXCHANGER CROSS-FLOW VS. COUNTER-FLOW SELECTION MATRIX
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Feature / Parameter Cross-Flow Heat Exchanger Counter-Flow Heat Exchanger
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Airflow Stream Geometry 90° Perpendicular (Orthogonal) 180° Anti-Parallel (Opposite)
Plate Core Physical Shape Square / Rectangular Profile Hexagonal / Diamond Profile
Sensible Thermal Efficiency 55% to 72% (EN 308 Standard) 78% to 92%+ (EN 308 Standard)
Temperature Cross Capability No (Supply cannot exceed exhaust) Yes (Supply heated above exhaust out)
Core Pressure Drop (ΔP) Low (50 Pa to 150 Pa) Moderate (120 Pa to 250 Pa)
Airflow Capacity Range 200 to 30,000+ CFM 200 to 12,000+ CFM (Modular multi-cores)
Physical Footprint & Volume Ultra-Compact Longer Flow Length (Hexagonal)
Capital Cost Level Economy to Mid-Range Premium High-Efficiency
Ideal Target Applications Industrial ventilation, AHUs, Commercial offices, passive houses,
paint booths, pool halls, data centers, cleanrooms, schools,
commercial kitchen hoods hospitals, extreme cold climates
================================================================================In a cross-flow unit, supply and exhaust air pass at right angles (90∘90∘) across alternate plate channels. Because the temperature difference varies across both axes, the theoretical thermodynamic limit of sensible efficiency is capped around 70%−72%70%−72%. However, cross-flow cores feature lower air-side pressure drops (<100 Pa<100 Pa), smaller physical footprints, and lower manufacturing costs, making them ideal for high-volume commercial air handling units (AHUs) and industrial exhaust systems.
In a counter-flow unit, air streams travel in opposite directions (180∘180∘) along extended parallel plate channels inside a hexagonal core. This maintains a nearly constant, high logarithmic mean temperature difference (LMTD) throughout the entire core length, unlocking sensible heat recovery efficiencies exceeding 85%−92%85%−92%. Counter-flow allows true "temperature cross," where fresh air exiting the core can reach a higher temperature than the exhaust air leaving the building.
CSTHEATEXCHANGER manufactures plate heat exchanger cores using specialized media tailored for specific operating environments:
CSTHEATEXCHANGER® AIR EXCHANGER MEDIA ARCHITECTURES
[ALUMINUM SENSIBLE CORE] [EPOXY / HYDROPHILIC CORED] [ENTHALPY ERV MEMBRANE]
• High-Purity Aluminum Foil • Epoxy / Blygold C5-M Coating • Micro-Porous Polymeric Sheet
• 100% Sensible Heat Only • Resists Chlorine & Acid Gas • Transfers Sensible + Moisture
• Zero Cross-Contamination • Swimming Pools & Coastal Air • Prevents Winter Over-Drying
• Operating Temp: Up to 200°C • Operating Temp: Up to 120°C • Operating Temp: -20°C to +60°CConstructed from high-grade, temper-hardened aluminum foils with five-fold hemmed edge seams. Mechanically rigid and completely non-porous, these cores guarantee zero moisture transfer and zero odor carryover, making them mandatory for commercial kitchens, hospital isolation rooms, pharmaceutical cleanrooms, and chemical laboratories.
For indoor aquatic centers, coastal installations, and wastewater facilities, plates are coated with double-sided epoxy or cataphoretic polymers, withstanding 3,000+ hours of ASTM B117 salt spray testing and resistance to airborne chlorine gas (Cl2Cl2) and sulfur dioxide.
Utilizes micro-porous polymeric membranes with high water-vapor permeability and zero gas permeability. Enthalpy ERVs recover both sensible heat and latent humidity:
Winter Operation: Recovers humidity from humid indoor exhaust, preventing dry indoor air (<30% RH<30% RH) without requiring high-energy steam humidifiers.
Summer Operation: Pre-dehumidifies incoming humid fresh air before it reaches the cooling coil, reducing chiller air conditioning electrical loads by 30%−45%30%−45%.
CSTHEATEXCHANGER® PACKAGED AIR EXCHANGER UNIT DESIGN
OUTDOOR FRESH AIR / EXHAUST VENTILATION INTERFACE
┌────────────────────────────────────────────────────────┐
│ 1. EN 1886 CLASS TB1 THERMAL BREAK DOUBLE-SKIN CASING │
│ • 50mm High-Density PU Foam (R-Value ≥ 12, U ≤ 0.04) │
│ • Class T2 Thermal Transmittance / Class D1 Leakage │
├────────────────────────────────────────────────────────┤
│ 2. DUAL DIRECT-DRIVE EC MOTOR BLOWERS (IE5 EFFICIENCY) │
│ • Backward-curved centrifugal fans with 0-10V control │
│ • Independent supply/exhaust fan speed balancing (CFM) │
├────────────────────────────────────────────────────────┤
│ 3. AUTOMATED 100% FACE-AND-BYPASS FREE-COOLING DAMPER │
│ • Modulating Belimo actuator opens for economizer mode │
│ • Automatically bypasses core when outdoor temp is mild│
├────────────────────────────────────────────────────────┤
│ 4. MULTI-STAGE FILTRATION & DEFROST MANAGEMENT │
│ • G4 + F7/F9 Fresh Air Filters + G4 Exhaust Pre-Filter │
│ • Intelligent Modulating Pre-Heater for Frost Defense │
└────────────────────────────────────────────────────────┘Built with 50 mm50 mm double-skin galvanized or stainless-steel panels injected with high-density polyurethane (PU) insulation foam. Thermal bridge factor TB1 and casing leakage class L1 / D1 completely prevent external condensation, casing sweating, and sound breakout (<48 dBA<48 dBA).
During spring and autumn mild ambient periods (+15∘C+15∘C to +20∘C+20∘C), cooling the building does not require heat exchange. An automated motorized bypass damper routes 100%100% of the fresh air around the heat exchanger core, providing zero-energy free cooling (economizer cycle) and lowering system fan resistance by 60%60%.
In winter climates below −10∘C−10∘C, exhaust air moisture can freeze inside the exhaust plate channels. CSTHEATEXCHANGER incorporates intelligent multi-stage defrost strategies:
Disbalance / Recirculation Defrost: Automatically slows the fresh air fan to allow warm exhaust air to thaw the core.
Modulated Electric or Glycol Pre-Heaters: Automatically pre-warms −25∘C−25∘C air to −5∘C−5∘C ahead of the core, ensuring continuous, non-stop ventilation without icing.
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CSTHEATEXCHANGER AIR EXCHANGER UNIT & CORE SPECIFICATIONS
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Parameter CSTHEATEXCHANGER Engineering Standard
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Airflow Delivery Range 200 CFM to 30,000+ CFM (340 m³/h to 51,000 m³/h)
Flow Configurations Cross-Flow (90° Orthogonal) OR Counter-Flow (180° Hexagonal)
Sensible Heat Recovery Coeff Cross-Flow: 55% - 72% | Counter-Flow: 78% - 92%+ (EN 308)
Latent (Moisture) Recovery Coeff Enthalpy Cores: 50% - 70% Total Latent Recovery (AHRI 1060)
Plate Media Options AlMn1Mg High-Purity Aluminum, Epoxy Coated, SS304/SS316L,
or Polymeric Enthalpy Polymer Membrane
Core Airtightness Rating Class L1 (EN 1886) / Internal Cross-Leakage < 0.1% at 400 Pa
Maximum Air Temperature Limit Aluminum: -40 °C to +120 °C (High-Temp Option up to +200 °C)
Enthalpy Polymer: -20 °C to +60 °C
Maximum Differential Pressure 1,500 Pa across plate walls without permanent deformation
Casing Construction (Packaged) 50mm Double-Skin PU Insulated Panels, EN 1886 TB1 / T2 / D1
Fan Motor Technology Dual Direct-Drive EC Inverter Backward-Curved Centrifugal Fans
Filtration Stages Standard Fresh Air: G4 Metal Pre-Filter + F7/F9 (MERV 13) Bag Filter
Exhaust Air: G4 Metal Mesh Filter
Bypass Damper Configuration Motorized 100% Face & Bypass Damper with Belimo Fast Actuator
Digital SCADA Control Interface Modbus RTU / BACnet IP / 0-10V Analog BMS Ready
================================================================================An HRV (Heat Recovery Ventilator) uses aluminum or plastic sensible plates that transfer temperature (heat) only, with zero moisture transfer. An ERV (Energy Recovery Ventilator) uses permeable polymer membranes that transfer both heat and moisture (water vapor), keeping indoor air humidified in dry winters and dehumidified in hot, humid summers.
Our aluminum and stainless-steel plate heat exchangers feature continuous automated five-fold mechanical edge crimping and high-grade silicone sealing. Every core undergoes differential air pressure decay testing to confirm cross-leakage is less than 0.1%0.1% at 400 Pa400 Pa, fully compliant with hospital and cleanroom air segregation standards.
For high-volume data center indirect evaporative cooling (IEC) and economizers (>10,000 CFM>10,000 CFM), cross-flow aluminum plate cores are preferred due to their ultra-low air pressure drop (<80−120 Pa<80−120 Pa), massive airflow throughput, structural rigidity, and low maintenance footprint.
Maximize ventilation energy savings, ensure IAQ air purity, and reduce chiller and boiler loads with air exchangers from CSTHEATEXCHANGER:
Cross-Flow (55%–72%) & Counter-Flow (78%–92%+) Heat Exchanger Cores & Units
Sensible Aluminum, Anti-Corrosion Epoxy, Stainless Steel & Enthalpy ERV Media
Class L1 Airtightness (<0.1% Cross-Leakage) for Cleanrooms, Hospitals & Laboratories
Complete Weatherized Packaged Units with EC Inverter Blowers & 100% Free-Cooling Bypass
Factory-Direct OEM Supply, Custom Dimensional Footprints & Global Delivery
Contact our commercial HVAC and air heat recovery engineering division today with your required airflow (CFM or m3/hm3/h), target heat recovery efficiency, and temperature conditions for detailed EN 308 thermodynamic simulations and competitive factory-direct pricing.
Website: https://www.cstheatexchanger.com/
Technical Inquiries: info@cstheatexchanger.com
