Tianfeng LS-20HP Compact Air-Cooled Circulating Chiller

Overview

The Tianfeng LS-20HP Compact Air-Cooled Circulating Chiller is an integrated, industrial-grade temperature control system engineered for precision cooling of laboratory and analytical instrumentation requiring stable, low-temperature recirculated coolant. Unlike water-cooled chillers that rely on external cooling towers or facility water loops, this unit employs a self-contained air-cooled condensing system—featuring high-efficiency copper-tube/aluminum-fin heat exchangers and low-noise external-rotor fans—to dissipate heat directly into ambient air. Its thermodynamic architecture centers on a hermetically sealed scroll compressor (14.7 kW), capillary expansion valve regulation, and a plate-type evaporator optimized for high thermal transfer efficiency and minimal pressure drop. Designed for continuous-duty operation under controlled environmental conditions (ambient ≤35 °C, relative humidity ≤80%), the chiller maintains setpoint stability within ±0.1 °C across its full 0–10 °C operating range—a critical performance criterion for applications sensitive to thermal drift, such as atomic absorption spectroscopy with graphite furnace atomization or high-resolution electron microscopy.

Key Features

• Hermetically sealed scroll compressor with built-in overheat, overcurrent, and discharge temperature protection
• Air-cooled condenser assembly: copper-tube/aluminum-fin core coupled with dual low-noise external-rotor fans (2.6 kW total; 20,000 m³/h airflow)
• PID-based digital temperature controller with real-time monitoring and programmable setpoint ramping
• Stainless-steel insulated reservoir (200 L capacity) with level sensor and anti-corrosion coating for extended coolant life
• Dual-pump configuration: primary refrigerant circulation pump (0.75 kW, 10 m head) and optional user-side booster pump (0.37 kW, 20 m head)
• Comprehensive safety suite: high/low pressure switches, phase sequence & phase loss detection, overtemperature cutoff, and exhaust gas overheating protection
• Robust mechanical construction: 2000 mm (L) × 800 mm (W) × 2000 mm (H); IP54-rated electrical enclosure; CE-compliant wiring layout

Sample Compatibility & Compliance

The LS-20HP is compatible with a wide range of laboratory and industrial equipment requiring closed-loop chilled water delivery at flow rates up to 2 L/min and backpressure tolerance of 2.0 bar. It interfaces seamlessly with ICP-OES, ICP-MS, XRF, XRD, SEM, TEM, and GFAAS systems—particularly those employing graphite furnace modules where thermal gradient control directly impacts analyte atomization efficiency and reproducibility. The chiller supports standard DN20 inlet/outlet connections and accommodates common glycol-water mixtures (up to 30% v/v) for sub-zero operational flexibility. All electrical and refrigerant handling procedures conform to IEC 61000-6-2 (EMC immunity) and ISO 5149 (refrigeration system safety). While not certified to UL 61010-1 or EN 61010-1 out-of-box, its design principles align with GLP-compliant infrastructure requirements for instrument cooling validation protocols.

Software & Data Management

The embedded controller provides local setpoint adjustment, real-time display of supply/return temperatures, compressor status, and fault logging with timestamped event history (retained for ≥10,000 cycles). Optional RS485 Modbus RTU interface enables integration into centralized lab infrastructure monitoring platforms. When deployed in regulated environments (e.g., pharmaceutical QC labs), the system supports manual audit trail generation per FDA 21 CFR Part 11 guidelines—though full electronic signature capability requires third-party SCADA-level middleware. No proprietary cloud service or remote firmware update functionality is included; all configuration remains locally administered to ensure data sovereignty and network security compliance.

Applications

• Cooling of high-power laser sources (CO₂, fiber, excimer) and associated optical components in materials processing and metrology
• Thermal stabilization of vacuum chamber walls and detector housings in surface analysis instruments (XPS, AES, SIMS)
• Heat rejection from RF generators and plasma torches in ICP spectrometry systems
• Temperature-controlled sample introduction in hyphenated techniques (e.g., LC-ICP-MS)
• Support of cryo-preparation workflows in transmission electron microscopy (TEM) specimen holders
• Process cooling for small-scale extrusion, injection molding, or semiconductor wafer probing stations

FAQ

What refrigerant does the LS-20HP use, and is it compliant with current environmental regulations?
The unit operates with R22 refrigerant. While R22 is being phased out globally under the Montreal Protocol, this model remains suitable for legacy installations and non-export markets where regulatory enforcement permits continued use. Replacement units are available with R404A or R410A upon request.
Can the chiller operate continuously at 0 °C ambient temperature?
Yes—the system is rated for continuous operation in ambient environments between 5 °C and 35 °C. Operation below 5 °C may require optional low-ambient control kits to prevent oil viscosity issues and compressor short-cycling.
Is the reservoir equipped with corrosion-resistant lining for deionized water use?
The 200 L tank features an electrophoretic epoxy coating and stainless-steel internal baffles, making it compatible with deionized water and 20–30% ethylene glycol solutions. Regular pH monitoring and biocide dosing are recommended for long-term DI water operation.
Does the unit support external flow control via analog signal input?
No—flow rate is fixed at 2 L/min via the internal pump. Variable-speed operation requires integration of an external frequency-controlled pump downstream of the chiller’s outlet manifold.
What is the expected service interval for compressor oil and filter replacement?
Under continuous operation at rated load, compressor oil and dryer filter should be replaced every 8,000 operating hours or biannually—whichever occurs first—per ISO 8573-1 Class 4 air quality maintenance standards.