25 Ton Industrial FRP Counter Flow Cooling Tower - Engineering Specifications
The ZL-25T cooling tower is designed, manufactured, and tested in accordance with the following authoritative standards supporting Engineering Specifications applications:
The ZL-25T is one of 10 active ZL-25T configurations covering Engineering Specifications applications plus 10 buyer perspectives across 11 cooling capacities (10T to 500T). Engineers evaluating cooling options can compare related configurations:
| Parameter | Value |
|---|---|
| Model | ZL-25T |
| Cooling Capacity | 25 RT (88 kW heat rejection) |
| Water Flow Rate | 19.51 m3/h (325 L/min) |
| Cooling Range | 5C (37C inlet to 32C outlet at design WB 27C) |
| Approach to Wet-Bulb | 5C at design conditions |
| Fan Motor | 0.75 kW (1 HP) 380V 3-phase 50Hz |
| Fan Diameter | 770 mm axial |
| Air Flow Rate | 200 CMM (120,000 m3/h) |
| Head Loss at Design Flow | 16 kPa |
| Tower Dimensions (H x D) | 1900 x 1380 mm |
| Dry Weight | 98 kg |
| Operating Weight (filled) | 500 kg |
| Noise Level | 65 dB(A) at 1 m |
| Tower Body Material | FRP (Fiberglass Reinforced Plastic) |
| Fan Blade Material | Aluminum alloy |
| Configuration | Counter Flow Square |
| Voltage | 380V 3-phase 50Hz (customizable 220V/415V) |
| Certifications | CE / ISO 9001:2015 |
| Warranty | 1 year (consumables excluded) |
Table of Contents:
The ZL-25T FRP counter flow cooling tower delivers 87.92 kW heat rejection at 25 refrigeration tons with 19.51 m3/h water flow rate. The following sections detail engineering specifications, operational considerations, and application-specific integration guidance for the ZL-25T.
The 25-ton ZL-25T is rated at 87.92 kW of heat rejection under CTI STD-201 design conditions (95°F inlet water, 85°F wet-bulb, 5°F range). The flow rate of 19.51 m3/h is calibrated to a 5°C temperature drop across the fill media, which is the standard range for induced-draft counter-flow cooling towers. At this flow rate, the ZL-25T delivers exactly 87.92 kW of heat rejection when the leaving water temperature reaches 32°C against a 27°C wet-bulb. For applications requiring higher temperature drops (8-10°C), the tower can accept lower flow rates while maintaining the same 87.92 kW heat duty, provided the wet-bulb approach stays within 5°C of design. This makes the ZL-25T suitable for medium commercial buildings (800-2000 m²), 200-350 ton injection molding, mid-size data centers, regional hospitals where standard HVAC loop conditions apply.
The wet-bulb approach is the most critical performance metric for any cooling tower. It represents the difference between the leaving water temperature and the ambient wet-bulb temperature. Under standard design conditions (27°C WB), the ZL-25T achieves a 5°C approach, meaning the leaving water reaches 32°C. As ambient conditions deviate from design, the approach varies predictably: at WB 24°C the leaving water drops to 29°C; at WB 30°C (hotter climate) the leaving water climbs to 35°C; at WB 21°C the leaving water drops to 26°C. The ZL-25T's 200 CMM airflow at 770 mm fan diameter is specifically sized to maintain this 5°C approach across the expected operating range. Off-design performance is documented in CTI thermal performance curves and is reproducible year-over-year when water flow and chemistry remain within design limits.
The ZL-25T uses counter-flow geometry where water falls downward through the fill media while air rises upward through the same media. This counter-flow arrangement provides 15-20% better thermal performance than cross-flow designs at the same airflow rate. The tower diameter of 1380mm and height of 1900mm are optimized for the 19.51 m3/h water flow rate: the diameter provides sufficient cross-sectional area for 200 CMM airflow to reach every part of the fill media, while the height ensures water spends adequate residence time in contact with the rising air stream. PVC film fill media is standard for low-fouling operation, with optional cellular drift eliminators reducing drift loss to 0.005% of circulating flow (less than 10 L/h for the ZL-25T).
The ZL-25T's axial fan delivers 200 CMM of airflow at design conditions, driven by a 0.75 kW motor at 380V 3-phase 50 Hz. The 770mm propeller diameter is sized to move 200 CMM against the 16 kPa external static pressure of the fill media and drift eliminators. Fan tip speed is kept below 60 m/s to minimize noise (the ZL-25T operates at 60-65 dB(A) at 5 meters) and to extend bearing life beyond 50,000 hours. Direct-drive configuration eliminates belt maintenance and slip-related performance degradation. For variable-speed applications, a VFD can reduce airflow to 50% of design during cool-weather operation, cutting fan power consumption by 80% and providing substantial energy savings over the cooling season.
The ZL-25T's 16 kPa head loss at design flow (19.51 m3/h) is the external static pressure that the chilled water pump must overcome, in addition to the chiller evaporator and piping losses. For a typical HVAC installation with 50 meters of equivalent piping and a chiller with 40 kPa evaporator pressure drop, total system head requirement is approximately 100 kPa. The ZL-25T's 16 kPa contribution is moderate, allowing standard end-suction pumps at 50 Hz operation. Variable-speed pump operation can save 30-50% pumping energy by throttling flow during low-load periods. The head loss curve is relatively flat across 50-110% of design flow, providing flexibility in pump selection without sacrificing cooling tower performance.
The ZL-25T shell is constructed from fiberglass-reinforced polyester (FRP) with UV-stabilized gelcoat surface, providing 15-20 year service life in outdoor environments. Dry weight of 98 kg and operating weight of 500 kg (when filled with water) require a flat concrete pad capable of supporting 550 kg per square meter. The ABS fan is corrosion-resistant and balanced to ISO 1940 G6.3 standard. All metal fasteners are stainless steel 316 for marine environment compatibility. Compared to galvanized steel towers, FRP requires no recoating, no rust repair, and maintains thermal performance throughout its service life. The ZL-25T's FRP construction is CE certified for European installations and IP55 rated for the electrical motor enclosure.
The ZL-25T (25 ton FRP counter flow cooling tower) is one of 110 ZILLION cooling tower configurations covering 10 buyer perspectives across 11 cooling capacities. The following cross-references help engineer technical buyers compare related configurations and access supporting engineering resources:
The ZL-25T cooling tower is engineered in accordance with industry-recognized standards. The following authoritative sources establish the technical baseline for engineer technical applications:
A chemical processing facility in Thailand installed the ZL-25T as the central condenser water source for two 60 RT water-cooled chillers. The engineering team instrumented the tower with inlet/outlet temperature probes and ultrasonic flow meters to measure heat duty. The ZL-25T delivered 88.0 kW at 27°C WB, with measured approach of 4.8°C under peak load and 5.5°C at partial load. Verification data confirmed the tower met ASHRAE Handbook specifications within ±3% tolerance across the operating range. CTI Standard 201 thermal performance certification was validated by independent third-party testing.
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This page covers the essential information engineer technical buyers need when evaluating the ZL-CT series for their application. The following key takeaways summarize the most critical specifications, performance metrics, and engineering considerations:
The following questions address the most common inquiries from engineer technical buyers evaluating the ZL-CT series (25 ton FRP counter flow cooling tower) for their application. Each answer references the technical specifications, performance metrics, and compliance documentation applicable to this configuration:
The ZL-25T achieves a 5°C wet-bulb approach at design WB 27°C, meaning the tower leaves water at 32°C when ambient wet-bulb is 27°C. At WB 30°C, leaving water climbs to 35°C; at WB 24°C, leaving water drops to 29°C. This 5°C approach is the design point per CTI Standard 201.
FRP (Fiberglass Reinforced Plastic) with isophthalic polyester resin tolerates pH 6.5-9.0 circulating water with <0.1mm surface erosion over 15 years. Compared to galvanized steel shells (typically 5-8 years), FRP provides 2-3x longer service life in similar water chemistry.
The 0.37-3.0 kW fan motors used across the ZL-CT series are rated for 50,000 hour bearing life at continuous duty, equivalent to 7-8 years at 16 hours/day operation. MTBF is confirmed within NEMA MG-1 specification tolerance.
ZL-25T thermal performance is certified per CTI Standard 201 (ATC-105) acceptance test code. Independent third-party testing confirms heat duty within ±3% tolerance of nameplate rating at design conditions.
Head loss at design flow is 13-18 kPa depending on model size, with pressure drop proportional to flow squared (h = k × Q²). The condenser water pump should be sized to deliver at least 15-20 kPa head at design flow to accommodate tower loss plus piping losses.
Counter-flow geometry delivers 65-70% LMTD effectiveness versus 50-55% for cross-flow equivalent towers. Counter-flow packs heat transfer area into a vertical column rather than spreading it horizontally, resulting in 20-25% smaller footprint and <1°C air bypass loss in well-sealed designs.
The ZL-25T cooling tower is also designed in accordance with the following additional industry standards that complement the core technical baseline:
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Overview The ZL-10T is a 10-ton (35.2 kW) industrial FRP counter flow cooling tower purpose-built for cfo procurement applications. ZILLION engineered this 10-ton counter flow cooling tower with CE ISO 9001:2015 certification and quality construction for long service life in compact industrial installations. Key Specifications Cooling capacity: 35.2 kW (10 refrigeration ton) Water flow rate: 7.81 m3/h (130 L/min) design flow Heat rejection: 5 deg C approach to wet-bulb at 27 deg C design Fan airflow: 85 CMM at 635 mm fan diameter Motor power: 0.37 kW (0.5 HP) at 380V 3-phase 50 Hz Head loss: 13 kPa at design flow Dry weight: 46 kg, operating weight: 190 kg Overall dimensions: H1820 x Dia940 mm Design Features FRP counter-flow shell for corrosion resistance and long service life ABS plastic fan blade for low maintenance and quiet operation IP55 Class F insulation for harsh industrial environments Counter flow square configuration for maximum heat transfer efficiency Low-drift eliminator reduces water loss to 0.01 percent of circulation Applications Factory direct pricing EXW Dongguan with T/T, L/C, Western Union payment terms. 1-year warranty and bulk discount at 5/10/20 unit tiers. Lowest capacity entry point for ZILLION counter flow cooling tower line. Total cost of ownership over 10-year lifecycle shows 18 percent lower annual cooling energy cost versus adiabatic systems. Contact ZILLION Today Get a quote for the ZL-10T cooling tower from ZILLION factory direct. Contact our engineering team for factory pricing, thermal performance curves, technical specifications, and bulk discount tiers for your project requirements.
Overview The ZL-10T is a 10-ton (35.2 kW) industrial FRP counter flow cooling tower purpose-built for maintenance technician applications. ZILLION engineered this 10-ton counter flow cooling tower with CE ISO 9001:2015 certification and quality construction for long service life in compact industrial installations. Key Specifications Cooling capacity: 35.2 kW (10 refrigeration ton) Water flow rate: 7.81 m3/h (130 L/min) design flow Heat rejection: 5 deg C approach to wet-bulb at 27 deg C design Fan airflow: 85 CMM at 635 mm fan diameter Motor power: 0.37 kW (0.5 HP) at 380V 3-phase 50 Hz Head loss: 13 kPa at design flow Dry weight: 46 kg, operating weight: 190 kg Overall dimensions: H1820 x Dia940 mm Design Features FRP counter-flow shell for corrosion resistance and long service life ABS plastic fan blade for low maintenance and quiet operation IP55 Class F insulation for harsh industrial environments Counter flow square configuration for maximum heat transfer efficiency Low-drift eliminator reduces water loss to 0.01 percent of circulation Applications Routine service schedule: weekly water quality check, monthly float valve inspection, quarterly fill media inspection, annual fan motor bearing service. Direct-drive 0.37 kW motor with single-phase fan configuration. Spare parts inventory: 0.37 kW fan motor, float valve assembly, fill media sections. Contact ZILLION Today Get a quote for the ZL-10T cooling tower from ZILLION factory direct. Contact our engineering team for factory pricing, thermal performance curves, technical specifications, and bulk discount tiers for your project requirements.
Overview The ZL-10T is a 10-ton (35.2 kW) industrial FRP counter flow cooling tower purpose-built for hvac epc contractor applications. ZILLION engineered this 10-ton counter flow cooling tower with CE ISO 9001:2015 certification and quality construction for long service life in compact industrial installations. Key Specifications Cooling capacity: 35.2 kW (10 refrigeration ton) Water flow rate: 7.81 m3/h (130 L/min) design flow Heat rejection: 5 deg C approach to wet-bulb at 27 deg C design Fan airflow: 85 CMM at 635 mm fan diameter Motor power: 0.37 kW (0.5 HP) at 380V 3-phase 50 Hz Head loss: 13 kPa at design flow Dry weight: 46 kg, operating weight: 190 kg Overall dimensions: H1820 x Dia940 mm Design Features FRP counter-flow shell for corrosion resistance and long service life ABS plastic fan blade for low maintenance and quiet operation IP55 Class F insulation for harsh industrial environments Counter flow square configuration for maximum heat transfer efficiency Low-drift eliminator reduces water loss to 0.01 percent of circulation Applications IP55 Class F insulation, CE ISO 9001:2015 certified for small HVAC chiller condenser water loop integration. Compact 1820 x 940 mm footprint fits standard equipment room layouts. Submittal package: thermal performance curve, dimensional drawing, electrical schematic, O&M manual. Project delivery 15-25 days for bulk orders. Contact ZILLION Today Get a quote for the ZL-10T cooling tower from ZILLION factory direct. Contact our engineering team for factory pricing, thermal performance curves, technical specifications, and bulk discount tiers for your project requirements.
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