Views: 0 Author: Site Editor Publish Time: 2026-09-24 Origin: Site
A V-type cooling coil (also known as a V-bank, V-shape, or inverted A-frame cooling coil) is a specialized heat exchanger assembly comprising two finned coil slabs arranged in an angled V-formation inside a vertical Air Handling Unit (AHU), vertical fan coil unit (FCU), or floor-mounted air conditioner.
In small vertical AHUs where cabinet cross-sectional floor space (W×DW×D) is severely restricted by building utility closets or mechanical shafts, a CSTHEATEXCHANGER V-type cooling coil solves the spatial bottleneck through three critical engineering advantages:
40% to 80%40% to 80% Greater Effective Face Area: Angling the two coil slabs (typically at 30∘ to 45∘30∘ to 45∘ angles) increases the total air-inlet face area by up to 80%80% compared to a single horizontal flat coil occupying the same cabinet footprint.
Safe, Low Face Velocity (1.8–2.4 m/s1.8–2.4 m/s / 350–475 FPM350–475 FPM): Expanding the face area reduces passing air velocity, cutting air-side static pressure drop (ΔPairΔPair) by 30% to 50%30% to 50% and significantly lowering fan motor energy consumption and acoustic noise.
Elimination of Condensate Water Blow-Off: Lower face velocity prevents high-speed airflow from stripping condensed water droplets off the fins, ensuring 100%100% of dehumidified moisture drains cleanly into the drain pan without blowing into downstream supply ducts.
Balanced Chilled Water or DX Refrigerant Distribution: Engineered with dual-circuit brass distributors (for direct expansion DX with R410A, R32, R454B, R134a) or balanced multi-pass hydronic headers for chilled water/glycol loops.
At CSTHEATEXCHANGER, we design and manufacture custom V-type cooling and evaporator coils engineered to fit tight OEM vertical AHU cabinets and custom commercial retrofit projects.
Selecting the proper coil geometry inside a vertical air handler depends on cabinet height, width, and airflow volume:
Engineering Dimension | V-Type (V-Bank) Dual Slab Coil | Slanted Single Slab Coil | Flat Horizontal Slab Coil |
|---|---|---|---|
Face Area Expansion Ratio | 1.4× to 1.8×1.4× to 1.8× (Maximum Area) | 1.15× to 1.3×1.15× to 1.3× (Moderate Area) | 1.0×1.0× (Baseline / Smallest Area) |
Airflow Face Velocity | Low (1.8–2.4 m/s1.8–2.4 m/s) | Medium (2.4–2.8 m/s2.4–2.8 m/s)** | High (>3.0–3.8 m/s>3.0–3.8 m/s)** |
Condensate Carryover Risk | Zero (Safe beneath threshold) | Moderate (Near critical limits) | Severe (High misting risk) |
Air-Side Pressure Drop (ΔPΔP) | Lowest (40–80 Pa40–80 Pa) | Moderate (80–130 Pa80–130 Pa) | Highest (140–240 Pa140–240 Pa) |
Required Cabinet Height | Moderate vertical height (400–700 mm400–700 mm) | High vertical height (600–900 mm600–900 mm) | Minimal vertical height (150–250 mm150–250 mm) |
Fan Energy Consumption | Lowest (Cuts fan watts by 30%+) | Moderate | Highest (Demands high-static fan) |
Best-Fit Application | High-CFM compact vertical AHUs | Medium-CFM narrow vertical units | Low-CFM horizontal fan coils |
A V-type cooling coil consists of two finned coil slabs mounted in an angled V-formation inside a vertical air handling unit. It significantly increases the heat-transfer surface area within a compact cabinet footprint compared to a single flat horizontal coil.
In narrow vertical air handlers, a flat coil has limited surface area, forcing passing air velocities above 3.0 m/s3.0 m/s (600 FPM600 FPM). This causes high air resistance, fan motor overload, and water droplet blow-off into supply ducts. Angling two slabs in a V-shape expands the face area by 40% to 80%40% to 80%, reducing velocity to a safe 1.8–2.4 m/s1.8–2.4 m/s.
By expanding the effective face area, the passing air velocity drops below the critical droplet carryover threshold (<2.5 m/s<2.5 m/s). Gravity easily pulls condensed moisture down the hydrophilic fins into the stainless-steel drain pan without droplets being stripped into the airstream.
The optimal design face velocity across each angled slab of a CSTHEATEXCHANGER V-type coil is 1.8 m/s to 2.4 m/s1.8 m/s to 2.4 m/s (350 to 475 FPM350 to 475 FPM).
Yes. CSTHEATEXCHANGER engineers V-type coils for Chilled Water loops (with balanced multi-pass hydronic headers) and Direct Expansion (DX) refrigerant systems (featuring dual brass venturi distributors for refrigerants like R410A, R32, R454B, and R134a).
Moisture condenses on both angled slabs and sheets downward along the hydrophilic fins into an insulated, sloped stainless-steel drain pan located beneath the assembly. A properly sized external P-trap ensures gravity drainage against the fan's negative suction pressure.
Yes. We manufacture custom drop-in replacement V-coils matching original cabinet dimensions, slab angles, mounting brackets, and piping connections with zero on-site modifications.
Please provide:
Airflow volume (m3/hm3/h or CFMCFM);
Entering air dry-bulb/wet-bulb temperatures (∘C∘C or ∘F∘F) and required leaving air temperature;
Cooling medium (DX refrigerant type or chilled-water supply/return temperatures);
Maximum allowable air-side and fluid-side pressure drops;
Available cabinet width, depth, and vertical height dimensions.
When designing or upgrading compact vertical Air Handling Units, CSTHEATEXCHANGER V-type cooling coils provide the ultimate balance of compact physical footprint, high thermal capacity, ultra-low air pressure drop, and complete moisture carryover protection.
CSTHEATEXCHANGER can engineer, customize, and manufacture the exact V-type cooling coil for your vertical air handling unit or OEM HVAC equipment. Contact our commercial coil engineering team today with your cabinet dimensions and cooling requirements for a detailed technical selection sheet and factory-direct quotation.
Contact CSTHEATEXCHANGER: www.cstheatexchanger.com
Email: info@cstheatexchanger.com
