Central Heating and Cooling

Central Heating and Cooling

The GRAD air source heat pump system incorporates an independently developed NB-IoT remote intelligent control module, enabling smartphone-based operation without the need for on-site personnel. This advanced system provides predictive fault alerts and real-time diagnostics while maintaining high efficiency across a broad operating range of -30°C to 43°C ambient temperatures, with heating capacity to deliver 60°C outlet water temperature.

Compatible with multiple terminal configurations, the unit supports radiator systems, underfloor heating, and centralized air conditioning for both cooling and heating applications. Its patented smart defrosting technology precisely detects frost formation, enables rapid defrost cycles, and significantly reduces both defrost frequency and duration compared to conventional systems.

Additional distinctive features include customizable modular design, elimination of dedicated equipment rooms, eco-friendly energy efficiency, quiet high-performance operation, and versatile application scenarios across diverse environments.

Key Product Advantages

1. Space-Saving Design with Lower Upfront Costs
   The outdoor-installed system eliminates the need for dedicated equipment rooms, cooling towers, or underground piping, significantly reducing initial infrastructure investment.

2. Energy-Efficient and Eco-Friendly Operation
   Delivering 75% higher energy savings compared to electric heating, the system operates without combustion, eliminating emissions, fire risks, and explosive hazards associated with traditional boilers.

3. Broad Operational Range for Versatile Applications
   Available in multiple configurations, the unit maintains stable heating performance at temperatures as low as -35°C and reliable cooling operation within a -30°C to 48°C range.

4. Smart Automation for Labor Savings
   An AI-driven control system continuously monitors performance and optimizes energy usage based on real-time demand, removing the requirement for manual oversight and cutting staffing expenses.

5. Comprehensive Safety Protections
   Integrated fail-safes and instant fault detection trigger automated alerts, ensuring uninterrupted operation and minimizing downtime risks.

Advanced Frost Resistance & Defrosting Technology

1. Optimized Heat Exchanger Design
   The large-diameter heat exchanger minimizes refrigerant flow resistance during low-temperature operation, enhancing evaporation pressure to significantly delay frost formation.

2. Low-Resistance Airflow System
   Featuring wide-spaced aluminum fins, the design reduces air-side flow resistance while maintaining high evaporation pressure for improved frost suppression.

3. Precision Defrost Control
   Independent fin airflow regulation enables targeted defrosting with surgical accuracy, ensuring complete ice removal without energy waste.

4. Breakthrough Defrosting System
   Incorporating multiple patented innovations including:

1. Distributed defrost technology

2. Piston-type 4-way reversing valve
   Eliminates common failures such as:

3. Liquid refrigerant suction

4. Incomplete defrost cycles

5. Valve sticking malfunctions

About us

Establised in 1993, GRAD Group covers an area of 1.15 million square meters and has more than 2,000 employees, with an annual output value of nearly 4 billion yuan. GRAD Group's main business: central air conditioning chiller and terminal products, FRP water tank, FRP winding pipe, FRP storage tank, wind turbine cabin cover, environmental protection equipment, and other more than 130 varieties. GRAD Group is the pillar enterprise of the “Dezhou Central Air-Conditioning City” named by the China Refrigeration and Air-Conditioning Industry Association. It ranks the top 10 among central air-conditioning enterprises in the country, The top 3 composite material enterprises，and gets the first-class qualification for the installation of national electromechanical equipment and the second-class qualification for air purification engineering. GRAD Group can undertake central air conditioning engineering, purification engineering construction.