Best HVAC Companies Near Me

Best HVAC Companies Near Me

High-Efficiency Centrifugal Chillers – Powerful, Smart & Reliable

How It Works

Our centrifugal chillers use electricity to power a highly efficient refrigeration cycle:

• Evaporation: R134a refrigerant absorbs heat in the evaporator, chilling water to 7°C–12°C for air conditioning.

• Compression: A two-stage centrifugal compressor boosts efficiency by compressing refrigerant vapor.

• Condensation: Water-cooled condensers convert refrigerant back to liquid.

• Expansion: Precise throttling controls refrigerant flow for optimal cooling.

Key Advantages

1. Ultra-Efficient Two-Stage Centrifugal Compressor

• Higher Energy Efficiency: Two-stage compression + economizer design reduces power consumption.

• Robust Construction: High-strength aluminum enclosed impeller (more efficient than open-type designs).

• Reliable Motor: IP54-protected, three-phase induction motor with Y-△, direct, or soft start options.

2. Flexible Voltage Options (380V/6kV/10kV)

• High-voltage models eliminate transformer costs, reduce cabling expenses, and save on electrical installation.

3. Intelligent SIEMENS Control System

• User-Friendly Interface: Real-time monitoring, 10–100% stepless capacity control, and clear fault diagnostics.

• Comprehensive Protection: Safeguards against power surges, high/low pressure, oil temperature issues, and more.

• Anti-Surge Technology: Smart prevention, control, and alarm system ensures stable operation.

4. Precision Throttling Options

• Orifice Plate (most reliable, no moving parts)

• Orifice + Solenoid Valve (balanced performance)

• Orifice + Electric Control Valve (most precise, optional upgrade)

• Custom-designed for each unit to maximize efficiency.

5. Smart Refrigerant & Oil Management

• Liquid Level Control: Static capacitance or floating ball sensors for accurate refrigerant regulation.

• Dedicated Oil Return System: Built-in oil pump + injection pump ensures reliable lubrication even at low pressure.

6. Eco-Friendly R134a Refrigerant

• Zero Ozone Depletion: Compliant with international environmental standards.

7. Compact & Quiet Operation

• Space-saving design reduces installation footprint.

• Low noise levels for smoother integration in commercial spaces.

Ideal Applications

• Commercial HVAC: Hotels, malls, offices, airports, stadiums.

• Industrial Cooling: Pharmaceuticals, data centers, manufacturing.

  Details

• About us

Shandong GRAD Group Co., Ltd. is a leading global manufacturer specializing in HVAC (Heating, Ventilation, and Air Conditioning) solutions. With over 30 years of production experienceand 16+ years in international business, we have built a strong reputation for innovation, reliability, and excellence. Our products are exported to 100+ countries, demonstrating our commitment to quality and customer satisfaction worldwide. Operating from a 500,000 sqm state-of-the-art production facility, we employ 2,000+ skilled professionals dedicated to delivering cutting-edge HVAC technologies. GRAD Group holds 1,000+ patents, underscoring our leadership in R&D and technological advancement. Whether for commercial, or industrial applications, we provide energy-efficient, sustainable, and high-performance HVAC solutions tailored to global market needs. Why Choose GRAD?

✔ 30+ Years of HVAC Expertise

✔ Strong International Presence (100+ Countries)

✔ Advanced Manufacturing with 500,000 sqm Facility

✔ 1,000+ Patents for Innovative Solutions

✔ Commitment to Quality & Sustainability At GRAD, we strive to create comfortable, efficient, and environmentally friendly climate control systems for a better future. For more information, visit our official website or contact us directly.