Air Cooled Scroll Chiller 320-920 kW with IPLV 4.8 AHRI Heat Recovery
The commercial rooftop chiller occupies a unique position in building mechanical design. It must deliver efficient cooling without the footprint and civil cost of a dedicated plant room, operate quietly enough to avoid disturbing adjacent occupied spaces, and perform reliably across dramatic part-load swings that define modern commercial occupancy patterns. The Midea Air Cooled Scroll Chiller family was purpose-built to satisfy all three demands simultaneously.
Two engineered families cover the 320-920 kW envelope: RHAE/RCAE series spanning 319.9 to 860 kW, and RHAG/RCAG series extending from 340 to 920 kW. Both utilize R410A refrigerant and fully enclosed scroll compressors equipped with Independent Digital Valving (IDV) — a capacity modulation technology that adjusts output in continuous fine increments rather than the fixed-step loading of conventional designs. This approach delivers IPLV ratings of 4.7-4.8 per AHRI 550/590, placing the platform among the most efficient air-cooled commercial chillers available globally.
For buildings with simultaneous cooling and hot water demand — hotels, hospitals, laundries, and food-service facilities — the optional desuperheater heat-recovery circuit captures condenser waste heat at either 40°C or 55°C output temperature. Up to 30% of total condenser heat can be redirected to domestic hot water preheating, displacing boiler fuel and creating a secondary efficiency gain that pays for the option within two to three years in high-DHW-demand applications. Combined with 8-unit intelligent parallel capability, the platform scales from a single rooftop unit to a multi-megawatt outdoor plant room.
Key Features
IDV Independent Digital Valving for Precision Part-Load Control
Commercial buildings rarely operate at peak cooling load. Retail spaces peak in the afternoon and drop sharply after closing. Office towers follow daily occupancy curves. Government buildings experience seasonal occupancy variation. In all these cases, the chiller spends the vast majority of operating hours between 25% and 75% load. The IDV system addresses this reality by modulating compressor output through an electronically actuated intermediate discharge valve, maintaining optimal compression ratio at every load point rather than cycling between fixed capacity steps.
- IDV technology modulates capacity in continuous fine increments, not fixed steps
- Eliminates the 40-60% efficiency penalty that fixed-speed chillers suffer below 50% load
- Maintains optimal compression ratio across the entire 25-100% operating range
- Smooth capacity transitions prevent temperature overshoot and occupant comfort complaints
- Directly contributes to the IPLV 4.7-4.8 rating under AHRI 550/590 test conditions
- Reduces mechanical cycling wear, extending compressor service intervals by 15-25%
AHRI-Certified IPLV 4.7-4.8 Performance
The Integrated Part Load Value represents weighted efficiency across four load points — 25%, 50%, 75%, and 100% — reflecting how a chiller actually performs over a typical operating season. The platform's IPLV of 4.7-4.8 per AHRI 550/590 places it in the top efficiency tier for air-cooled commercial scroll chillers worldwide.
- IPLV 4.7-4.8 certified per AHRI 550/590 for independently verified part-load performance
- Weighted across 25/50/75/100% load points matching real commercial operating profiles
- 25-35% lower annual energy consumption versus standard-efficiency scroll chiller baselines
- AHRI certification provides auditable documentation for tender and green-building submissions
- Directly supports LEED and BREEAM energy-performance credit calculations
- Annual utility cost reduction of 25-35% delivers simple payback on efficiency premium within 2.5-4 years
Optional Desuperheater Heat Recovery at 40°C or 55°C
Every air-cooled chiller rejects heat to atmosphere through its condenser. In buildings that simultaneously require domestic hot water — hotels with guest-room showers, hospitals with sterilization needs, laundries, and food-processing facilities — that rejected heat represents a recoverable resource.
- Factory-installed desuperheater circuit at 40°C or 55°C hot water output
- Captures up to 30% of total condenser heat for domestic hot water preheating
- Hot water generation requires no additional compressor energy — effectively free thermal output
- Annual boiler fuel savings of 15,000-40,000 litres equivalent in hotel applications
- Eliminates or downsizes dedicated gas water heaters in combined cooling-and-DHW applications
- Recommended to specify at order for lowest total installed cost versus field retrofit
8-Unit Intelligent Parallel Sequencing
When a single rooftop chiller cannot meet the cooling demand, multiple units connect through a dedicated RS-485 communication bus with automatic master-selection protocol.
- Up to 8 units connect via dedicated RS-485 bus with automatic master selection
- Master unit receives single BMS load signal and sequences all units proportionally
- Automatic lead-lag rotation equalizes run hours across all units in the parallel group
- Extends individual compressor overhaul intervals by 20-30% through even wear distribution
- Each unit operates at its most efficient load point rather than all units cycling simultaneously
- BACnet gateway available as accessory for direct integration with building automation systems
Rooftop-Ready Self-Contained Enclosure
Conventional water-cooled or large air-cooled chillers require a dedicated plant room — a significant civil-works investment including structural foundation, weatherproofing, ventilation louvres, and access infrastructure.
- Self-contained weatherproof casing requires no dedicated plant room structure
- Saves $15,000-30,000 in civil works per installation compared to indoor plant room alternatives
- Preserves valuable indoor floor area for revenue-generating leasable space
- Factory-charged refrigerant circuit and leak-tested before shipment — no field brazing required
- Lifting lugs and forklift channels integrated into base frame for straightforward crane placement
- Modular casing design allows side-by-side installation with seamless panel joining
Fully Enclosed Scroll Compressor Architecture
The scroll compressor's operating principle — two interleaving spiral scrolls creating progressively smaller vapour pockets — produces continuous compression without the pulsation, vibration, and valve losses inherent in reciprocating designs.
- No suction or discharge valves eliminates common wear points in reciprocating compressors
- Continuous scroll compression produces minimal vibration and acoustic noise
- Fully enclosed housing protects motor windings and compression surfaces from contaminants
- Rated service life exceeds 50,000 operating hours under standard commercial conditions
- IDV part-load strategy reduces mechanical cycling by 15-25% versus fixed-capacity scroll machines
- Compressor replacement can be performed individually without disturbing the full refrigerant charge
Technical Specifications
| Parameter |
RHAE/RCAE Series |
RHAG/RCAG Series |
| Cooling Capacity Range |
319.9-860 kW |
340-920 kW |
| Refrigerant |
R410A |
R410A |
| Compressor Type |
Fully Enclosed Scroll with IDV |
Fully Enclosed Scroll with IDV |
| IPLV (AHRI 550/590) |
4.7-4.8 |
4.7-4.8 |
| Maximum Parallel Units |
8 |
8 |
| Cooling Operating Range |
0°C to 48°C |
0°C to 48°C |
| Heating Operating Range |
-15°C to 48°C |
-15°C to 48°C |
| Heat Recovery Option |
40°C / 55°C |
40°C / 55°C |
| BMS Protocols |
RS-485, BACnet (optional) |
RS-485, BACnet (optional) |
| Warranty |
5 years |
5 years |
| Origin |
China |
China |
Applications
- Shopping malls and retail complexes with dramatic afternoon-to-evening load transitions
- Data centres and server rooms requiring year-round cooling with N+2 redundancy from parallel units
- Full-service hotels combining simultaneous guest-room cooling and domestic hot water demand
- Government and institutional buildings where lifecycle-cost procurement is mandated
- Medium-density office parks seeking rooftop installation without plant-room civil investment
- Hospital outpatient wings and diagnostic imaging centres needing reliable, maintained cooling
Certifications & Standards
- AHRI 550/590 — Performance and IPLV rating per Air-Conditioning, Heating, and Refrigeration Institute standard
- Eurovent — Independent third-party performance verification for European market compliance
- CE Marking — European conformity for commercial refrigeration equipment
- ISO 9001/14001/45001 — Quality, environmental, and occupational health management systems
