Solar Commercial Cooling System

The Solar Commercial Cooling System combines photovoltaic power with high-efficiency cooling equipment to reduce grid electricity consumption for commercial HVAC applications.

Depending on project size, the system can be configured around hybrid solar air conditioners or larger solar-powered heat pump units for chilled-water cooling.

For larger commercial applications, solar heat pump models currently cover 53.3 kW to 115 kW rated cooling capacity, with 200–560 V DC solar input and 380 V, 50/60 Hz AC grid input. Recommended PV capacity ranges from 22 kW to 48 kW across the listed models.

The system can be specified according to the building cooling load, available PV capacity, grid conditions, water-side requirements, and operating environment.

EVI DC Inverter Compression
The commercial heat pump platform uses EVI DC inverter compressors. Inverter compressor technology allows the cooling output to be adjusted according to operating demand rather than relying only on fixed-speed operation. The listed commercial models use 2 compressors on the smaller units and 4 compressors on the largest listed unit. This configuration also provides a practical basis for capacity management in larger commercial systems.

Wide Solar DC Input
The solar heat pump platform accepts a 200–560 V DC input range. This allows the PV array to be specified according to the electrical characteristics of the project rather than treating the solar system as a separate, unrelated power source.

Grid-Assisted Operation
The commercial system can be configured with a 380 V, 50/60 Hz AC supply. This is important for commercial projects because cooling demand does not always correspond directly to instantaneous PV generation. A hybrid solar/grid configuration can therefore reduce dependence on solar availability while maintaining the required cooling operation.

Chilled-Water Cooling
The larger systems use a water-side heat exchanger and are intended for hydronic cooling applications. Published water-side specifications include:

• Water flow: 13–29.7 m³/h
• Water connection: DN50–DN80
• Water pressure drop: ≤35–50 kPa

The final pipe size and hydraulic configuration should be confirmed against the selected model and project flow requirements.

The system uses PV electricity as a direct energy source for the cooling equipment. During periods of solar generation, photovoltaic power can supply the DC side of the system while the AC grid provides supplementary power when required.

For a chilled-water application, the operational pathway is structured as follows:

• PV panels generate electricity.
• Direct current (DC) power is routed into the system input.
• Inverter-driven compressors regulate refrigerant pressure and flow.
• The refrigerant circuit transfers thermal energy through the heat exchanger.
• Chilled water is produced and circulated to the building cooling network.

The chilled water can then be distributed through:

• Fan coil units
• Air handling units
• Commercial air-conditioning terminals
• Process cooling equipment
• Other compatible hydronic cooling loads

The control system manages the available solar and grid power according to the system configuration. This architecture is particularly relevant to commercial buildings where cooling demand is high during the same daytime period when solar generation is available.

To ensure reliable operation in commercial environments, the system incorporates comprehensive safety features:

Electrical Protections: Over-voltage, under-voltage, phase loss, and over-current protection for both DC PV inputs and AC grid inputs.

Compressor Protection: Crankcase heaters, high/low pressure switches, and exhaust temperature monitoring to prevent premature compressor wear.

Hydraulic Protections: Water flow switches and anti-freezing protection to safeguard the plate heat exchangers during low-load conditions.

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