ZL-15T 15 Ton Industrial FRP Counter Flow Cooling Tower - Agriculture Food Processing

15 Ton Cooling Tower Technical Specifications and Application Details

The ZL-15T FRP counter flow cooling tower delivers 52.75 kW heat rejection at 15 refrigeration tons with 11.7 m3/h water flow rate. The following sections detail engineering specifications, operational considerations, and application-specific integration guidance for the ZL-15T.

HTST Pre-Cooling Stage: 72 deg C to 32 deg C via Plate Heat Exchanger

High-Temperature Short-Time (HTST) pasteurization at 72°C for 15 seconds is the standard milk pasteurization process. After the holding tube, the milk must be cooled before packaging. The ZL-15T cooling tower supports the pre-cooling stage of this HTST line. A plate heat exchanger (PHE) uses ZL-15T leaving water at 32°C as the cooling medium on the cold side, dropping the milk from 72°C to approximately 32°C. Flow ratio: ZL-15T delivers 11.7 m3/h of 32°C water, suitable for HTST lines processing up to 1111 L/h of milk in the pre-cooling stage. The regeneration section of the PHE also pre-heats incoming cold milk (4°C) using the outgoing hot milk (72°C), reducing thermal load on the ZL-15T and improving overall plant efficiency.

HTST Final Cooling: 32 deg C to 4 deg C via Chiller Loop with ZL-15T Condenser

The final cooling stage of HTST pasteurization takes milk from 32°C down to 4°C for refrigerated storage. This step requires chilled water at 1 to 4°C, which a cooling tower cannot produce directly because ZL-15T leaving water is 32°C at design wet-bulb 27°C. The standard configuration uses ZL-15T as the condenser cooling tower for a chiller: ZL-15T supplies 32°C condenser water to the chiller, the chiller uses this to remove heat from the refrigerant, and the chiller outputs 4°C chilled water to the plate heat exchanger for the final cooling stage (32°C to 4°C). ZL-15T plays an indirect role in final cooling by enabling chiller operation, not by directly contacting the milk below 32°C.

Dairy Processing Plant Cooling Configuration with ZL-15T

The ZL-15T cooling tower serves as the central cooling water source for dairy processing plants, providing 32°C leaving water for multiple process applications: HTST pre-cooling, condenser water for refrigeration chillers, and CIP cycle return water cooling. The 11.7 m3/h flow rate supports a complete small dairy processing operation with 5,000-10,000 L/day milk throughput. SS316L stainless steel upgrade is required for all milk-contact surfaces including fill media support frames and water distribution piping. CIP cycle compatibility with 80°C hot water sanitization is essential for dairy operations, requiring the ZL-15T to support periodic thermal cycling for cleaning.

Brewery Wort Cooling: 100 deg C to 20 deg C in 30 Minutes with ZL-15T

Brewery wort cooling is a critical process step that rapidly cools boiled wort from 100°C to fermentation temperature (typically 18-22°C). The ZL-15T cooling tower supports brewery cooling through a two-stage process: Stage 1 (Pre-cooling) uses ZL-15T leaving water at 32°C as the primary coolant in a plate heat exchanger to drop wort temperature from 100°C to approximately 32°C. Stage 2 (Final cooling) uses a chiller with ZL-15T providing condenser water to cool wort from 32°C to 20°C. The ZL-15T's 11.7 m3/h flow rate supports brewery operations with 5,000-15,000 L/batch wort cooling capacity, suitable for craft breweries and regional production facilities.

Food-Grade Water Contact: FDA 21 CFR Compliance for ZL-15T

The ZL-15T cooling tower's SS316L stainless steel upgrade option complies with FDA 21 CFR regulations for food contact surfaces. SS316L composition (chromium 16-18%, nickel 10-14%, molybdenum 2-3%) provides corrosion resistance and minimizes metal leaching into food products. The electropolished surface finish (Ra less than 0.8 micron) prevents bacterial adhesion and facilitates CIP cycle effectiveness. FDA 21 CFR compliance documentation: (1) SS316L material certificates with composition analysis; (2) Surface finish certificates per ASTM A480; (3) Extractables and leachables testing reports; (4) FDA Generally Recognized as Safe (GRAS) documentation for SS316L; (5) Compliance with FDA 21 CFR 110 (Good Manufacturing Practice). ZILLION provides FDA compliance documentation package for the ZL-15T cooling tower to support customer regulatory submissions.

CIP Cycle Integration: 80 deg C Hot Water Sanitization for ZL-15T

The ZL-15T cooling tower with SS316L upgrade supports Clean-In-Place (CIP) sanitization cycles with 80°C hot water for 30 minutes to eliminate biofilm and microbial contamination. CIP cycle sequence: (1) Pre-rinse with cold water to remove residual product; (2) Caustic wash at 75°C with 1-2% NaOH for 20 minutes; (3) Intermediate rinse with cold water; (4) Acid wash at 60°C with 1% HNO3 or H3PO4 for 15 minutes; (5) Final rinse with cold water; (6) Sanitization with 80°C hot water for 30 minutes. The ZL-15T's SS316L construction withstands repeated thermal cycling between 4°C and 80°C without material degradation. CIP cycle frequency: daily for high-care food production, weekly for standard food processing.

Refrigeration Condenser Water: Brewery and Cold Storage with ZL-15T

The ZL-15T cooling tower provides condenser cooling water for ammonia or HFC refrigeration systems serving breweries, cold storage warehouses, and food processing facilities. The 11.7 m3/h flow rate supports refrigeration capacity of approximately 21 kW when paired with evaporative condensers or shell-and-tube condensers. For ammonia refrigeration systems (preferred for large industrial food facilities), the ZL-15T's stable condenser water temperature at 32°C enables efficient ammonia condensing at 25-28°C, minimizing compressor discharge pressure and energy consumption. For HFC refrigeration systems (R-404A, R-507, R-448A), the ZL-15T provides similar benefits with compatibility across all modern refrigerants.