Midea Commercial Air Conditioners 2018/2019

Midea CAC: A Global Leader in HVAC Solutions

Midea CAC is a key division of the Midea Group, a leading producer of consumer appliances and provider of heating, ventilation, and air conditioning solutions. Midea CAC has continued with the tradition of innovation upon which it was founded, and emerged as a global leader in the HVAC industry. A strong drive for advancement has created a groundbreaking R&D department that has placed Midea CAC at the forefront of a competitive field. Through independent efforts and joint cooperation with other global enterprises, Midea has supplied thousands of innovative solutions to customers worldwide.

Midea CAC operates three production bases: Shunde, Chongqing, and Hefei.

• MCAC Shunde: 38 product lines focusing on VRF, Split Products, Heat Pump Water Heaters, and AHU/FCU.
• MCAC Chongqing: 14 product lines focusing on Water Cooled Centrifugal/Screw/Scroll Chillers, Air Cooled Screw/Scroll Chillers.
• MCAC Hefei: 11 product lines focusing on VRF, Chillers, and Heat Pump Water Heaters.

Company History Highlights:

• 2017: Developed the large capacity air cooled scroll chiller.
• 2016: Acquired an 80% stake in Clivet.
• 2015: Launched the inverter direct-drive centrifugal chiller and magnetic chiller. An international strategic platform brought Midea Group, Carrier Corporation, and Chongqing General Industry Group together in the chiller business.
• 2013: Launched the super high efficiency centrifugal chiller with dual-stage compressor and full falling-film evaporator.
• 2008: Developed the Smart Star new-generation Semi-Hermetic centrifugal chiller.
• 2007: Won the first Midea centrifugal chiller project overseas.
• 2006: Launched the first VFD (Variable Frequency Drive) centrifugal chiller.
• 2004: Acquired MGRE and entered the chiller industry.
• 2001: The R134a (LC) series centrifugal chiller was named as a key national product.
• 1999: Entered the CAC field.

Introducing Our Products

Midea Chillers offer a comprehensive product lineup and a wide application range to meet varied customer requirements. In 2013, Midea launched its full falling-film, dual-stage compression centrifugal chillers, featuring up to 6.7 COP and certified by AHRI. Capacities range from 600RT to 2,200RT, including high efficiency and super high efficiency series, significantly expanding the product's application range. The full falling-film heat exchange technology and new-generation design of the dual-stage compression have also increased efficiency. With patented heat exchange technology, the refrigerant charging volume is up to 40% less than the flooded type, protecting the environment and decreasing CO2 emissions.

Capacity Range Visual: A graphical representation shows capacity from 0 to 2000 RT, highlighting High Efficiency and Super High Efficiency series within this range.

Index

• 05: Mechanical Specification
• 07: Features
• 13: Parts Introduction
• 17: High Efficiency Series
• 21: Super High Efficiency Series
• 25: Starter Cabinet Dimensions
• 26: Optional Items
• 27: Operating and Control System
• 33: Reference Projects
• 45: Reference Projects List

Mechanical Specification

Midea's centrifugal chillers feature advanced design platforms for improved performance, efficiency, and stability.

Key Components and Technologies:

• Dual-stage type economizer: Improves efficiency by 5-8% compared to single-stage compressors.
• Semi-Hermetic centrifugal compressor: Compact design with fewer moving parts, double-layer technology for noise and vibration management. Features precisely aligned impeller and chamber.
• Gas cooled motor: Cooled by refrigerant for outstanding performance and long service life, with a high power factor up to 97%.
• Shell and tube condenser & Full falling-film type evaporator: Condenser designed for easy service. Evaporator utilizes full falling-film technology for enhanced heat exchange.
• Environmentally friendly refrigeration (R134a): Zero ODP and low GWP, compliant with the Montreal Protocol.
• Advanced system control: Industry-type PLC with multiple functions, high stability, and open protocol (RS485) for BMS compatibility. Features a user-friendly 10-inch color touchscreen.
• Keyless impeller coupling: Connects impeller to shaft without a key, eliminating stress concentration, ensuring stable high-speed shaft operation, and extending service life.
• Full falling-film heat exchange technology: Unique spraying technology creates a refrigerant film on tube surfaces, increasing heat exchange rate by 3-8% and reducing refrigerant charge by 40%.

Diagrams illustrate compressor components (impeller, motor, shaft, etc.), the chiller unit, and the falling-film heat exchange process.

Features

High Efficiency and Low Operating Costs

Midea centrifugal chillers offer up to 6.3 COP under AHRI conditions. "Free cooling" technology during transition seasons further reduces running costs by eliminating compressor usage.

Graphical representation shows total cost (initial + running) comparison between normal centrifugal chillers, high efficiency models, and Midea Premium+Free cooling systems over running years.

Environmentally Friendly

Utilizes R134a, an environmentally friendly refrigerant with zero ozone depletion potential (ODP) and low global warming potential (GWP), meeting the Montreal Protocol. The full falling-film evaporator significantly improves heat exchange efficiency and reduces refrigerant charge volume by over 40%.

Charts compare ODP and GWP values with R22 and R123 types, showing Midea's R134a models have significantly lower environmental impact. A bar chart illustrates the reduction in refrigerant charge volume.

Reliable Quality

All units are 100% run-tested in the factory. High R&D investment and strict quality requirements ensure high product reliability. Features advanced testing facilities, including an 8000 kW chiller performance testing center and a 1500 kW motor performance testing center, ensuring precise data and performance verification.

Simple and Convenient Operation

The Midea Control System (MCS) offers control and monitoring capabilities, including pre-alarms, fast troubleshooting via big data analytics, and maintenance advice, even without a BMS.

Visuals depict a coffee room and chillers, suggesting ease of use and integration.

Wide Application

The "wide range" compression ratio design ensures efficient operation in various conditions, including low water flow systems, variable primary flow systems, and standard water or groundwater systems. Large-capacity chillers minimize initial investment and floor space for large projects.

Long Lifespan

Keyless impeller coupling and patented design reduce mechanical losses and utilize well-known brand parts to ensure stable operations, reliability, and extended service life.

Six Core Technologies

Explore the Frontier of Aerodynamic Technology

Full Flow Pass Optimization: A newly designed 3D flow impeller and optimized volute ensure flow velocity and maximize efficiency.

Visuals show a high-efficiency 3D flow impeller and airflow simulation diagrams illustrating turbulence reduction and aerodynamic loss balance for reduced noise.

Pre-rotation Guide Vane Technology: Airfoil-shaped guide vanes produce rotation under different load conditions, extending the operation range and increasing part-load efficiency.

Diagrams compare conventional guide vanes with pre-rotation guide vanes, showing improved operation range and efficiency.

Dual-stage Compression Technology

Enhances heat absorption capacity and lowers power consumption, increasing energy efficiency by 6% over single-stage compressors. The dual-stage impeller features an equal ratio compression design for improved reliability. A unique three-stage separation economizer simplifies system design.

Diagrams illustrate the dual-stage compressor, economizer cycle, and compare single-stage vs. dual-stage cycles on an enthalpy-pressure chart.

Entire Optimization: Gas flow perfectly matches the interior flow channel, reducing impact loss. Midea compressors use an overhung volute for a compact structure.

Unique Heat-Exchanging Technology

Full Falling-film Evaporating Technology

Utilizes spraying technology to create a liquid refrigerant film on evaporating tubes, significantly boosting heat-exchange efficiency and reducing refrigerant charge by 40%. Patented technologies ensure even refrigerant distribution, preventing liquid formation in the evaporator and maximizing heat-exchanging capacity.

Visuals show diagrams of the falling-film evaporator and condenser, highlighting the 40% reduction in refrigerant charge compared to flooded types and the 25% reduction compared to mixed flooded types.

Condenser

Features a highly efficient heat-exchanger with optimized structure. A reverse-flow sub-cooling chamber with multiple turbulence elements increases sub-cooling levels and improves performance.

Diagrams illustrate the condenser's internal structure and the flow of cooling water and refrigerant.

Prospective-Control Logic

The microcomputer control system offers trend prediction, self-diagnosis, self-adjustment, and safety protection. It predicts real load changes to modify operating load and prevent energy waste.

Graphs show temperature changes under prospective control versus standard control, illustrating improved stability.

Free Cooling Technology Refrigeration Migration

When outdoor temperatures are low, chillers operate in 'Free Cooling' mode, producing chilled water without running the compressor. Warm air and energy are transferred to the condenser, cooled by the cooling tower, and then naturally circulate to the evaporator. This reduces costs by eliminating compressor power consumption and is ideal for transition seasons (late fall, winter, early spring).

Visuals depict different seasons (snowy, autumn, spring) to illustrate the application of free cooling.

Parts Introduction

Midea's advanced design platform enhances the performance of key components like impellers and volutes, increasing compressor isentropic efficiency up to 88.2%.

Key Components:

• Compressor: Features high-strength aluminum alloy impellers, moveable inlet guide vanes for part-load efficiency, and a balanced thrust design. Dynamically balanced and overspeed-tested for smooth operation.
• Motor: Semi-hermetic, two-pole, refrigerant-cooled motor with embedded sensors for thermal protection. High operating performance and long life span. Lower inrush currents and noise compared to open motors.
• Impeller And Inlet Guide Vane: High-strength aluminum-alloy impellers with reversed-curved vanes for high efficiency. Airfoil-shaped inlet guide vanes minimize flow disruption. Tested at 125% of designed operating speed.
• Keyless Impeller Coupling: Eliminates stress concentration on the power transmission surface, increasing impeller service life and efficiency. Awarded a patent by the State Intellectual Property Office of P.R.China.
• Precise Gearing: Single helical gears with crowned teeth for even load distribution and quiet operation. Case hardened and precision ground for durability.
• Bearings: Suitable for journal bearings, with a babbitt alloy covering to protect the shaft. High-tech oil film lubrication minimizes contact and friction.
• Lower Sound Levels and Vibration: Achieved through engineered gearing, double soundproof gearbox structure, and optimized impeller/tunnel design.
• Condenser Baffle: Prevents direct impingement of high-velocity gas onto condenser tubes, reducing vibration and wear, and distributing refrigerant flow evenly for increased efficiency.
• Advanced Capacity Adjustment: Inlet guide vanes work with movable diffusers for a stepless capacity range (10%-100%), free of surges. Controlled by an actuator linked to the PLC. Awarded a patent.
• Reliable Lubricant System: Features an internal oil sump with heaters, oil pump, oil cooler, and oil return line for continuous lubrication and protection against power loss.
• Oil Filter and Oil Cooler: Plate-type oil cooler mounted on the compressor, with external filter and cooler for simplified maintenance.
• Unmatched Oil Reclaim System: Patented system returns oil from the heat exchanger to the oil tank, improving refrigerant purity and compressor oil supply.
• Low Inrush Current: Utilizes a wye-delta starter to reduce inrush current, with options for soft start and VFD.
• 100% Factory Run-Tested: All units undergo complete performance testing before shipment to verify performance and ensure smooth start-up.
• Heat Exchanger Tube: High-efficiency, externally and internally enhanced tubes made from copper alloy (90/10 copper-nickel). Tubes are individually replaceable.
• Water Box: Fabricated from steel, designed for high working pressure, with integral steel water baffles.
• Orifice: Fixed orifices used for reliability in standard efficiency models. High-efficiency models use orifices with electronic ball valves and liquid level control for improved partial load efficiency.
• Control Panel: State-of-the-art microprocessor control system with a 10.4-inch LCD touchscreen for graphical display and easy operation. Supports remote control and logging of failure reports.
• Lubrication System: Separately driven electric oil pump supplies lubricant, filtered and cooled, to bearings. Seals prevent refrigerant leakage. Oil heater maintains temperature during shutdown.

Diagrams and images illustrate these components and systems.

High Efficiency Series

Nomenclature

Example: C C W E 1500 H 10

• C: Centrifugal chiller
• C: Cooling only
• W: Water cooled
• E: Design series number
• 1500: Cooling capacity (RT)
• H: High efficiency type
• 10: 10KV (Omit for 380V)

Specifications

Detailed specifications including cooling capacity (RT, kW, kcal/h), running power (kW), efficiency (COP, kW/kW), motor input power, chilled water flow rate and pressure drop, cooling water flow rate and pressure drop, dimensions, and weights are provided for models ranging from 600RT to 1300RT.

Tables list these specifications for various models.

Super High Efficiency Series

Nomenclature

Example: C C W E 1500 E 10

• C: Centrifugal chiller
• C: Cooling only
• W: Water cooled
• E: Design series number
• 1500: Cooling capacity (RT)
• E: Super high efficiency type
• 10: 10KV (Omit for 380V)

Specifications

Detailed specifications including cooling capacity (RT, kW, kcal/h), running power (kW), efficiency (COP, kW/kW), motor input power, chilled water flow rate and pressure drop, cooling water flow rate and pressure drop, dimensions, and weights are provided for models ranging from 600RT to 2200RT.

Tables list these specifications for various models.

Starter Cabinet Dimensions & Options

Starter Cabinet Dimensions

Provides front, back, and side views of closed star-delta starting cabinets and high-voltage start cabinets, with dimensions for different capacity ranges (600RT-1300RT and 1400RT-2200RT). Includes maintenance and operation plane spacing details.

Diagrams show cabinet layouts and dimensions.

Options

A table lists various optional features and accessories, including power supply options, connection types, water boxes, pressure vessel passes, starting methods (Star Delta, DOL, VFD), chiller sequence management, vibration isolators, dual compressors, heat recovery options, chilled water Delta T settings, centrifugal heat pumps, water/ice storage, free cooling mode, section transportation, communication protocols (Modbus-RTU, BACnet), hot gas bypass, flow switches, and witness performance testing.

A table lists standard and optional features.

Operating and Control System

Midea's intelligent control system integrates monitoring functions for reliable start, high efficiency, and safe operation. Midea provides installation and commissioning services.

Key Features:

• Interface Display: Graphical display with touch screen for operation parameters, status, and alarms. Includes query function for data history and trend curves.
• Operation Control: Allows user-defined outlet temperature, automatic load/unload based on chilled water temperature, pause function to reduce OPEX, and independent start/stop control.
• Safety Protocols: Monitors oil pressure difference, oil temperature, compressor motor ampere, evaporator pressure, and condenser pressure to prevent damage.
• Interlock Control: Manages oil pump pre/post-lubrication, water pump pre-running/post-running, starter interlocks, and inlet guide vane interlocks.
• Safety Protection: Includes protections for inadequate oil supply, high oil temperature, oil pump overload, low chilled water outlet temperature (anti-freeze), current overload, high motor winding temperature, start time limit, power supply issues, and starter failure.
• Basic Indication Items: Displays various temperatures, pressures, oil levels, currents, and run times.
• User Settings: Allows configuration of restart/pause temperatures, current limits, load settings, and more.
• Capacity Control: Features minimum IGV opening control, maximum motor current control, leaving chilled water temperature control, inlet guide vane actuator, and manual mode option.

Screenshots of the Midea Intelligent Control interface are provided.

Standard Protection

The system incorporates comprehensive protection mechanisms to ensure safe and reliable operation:

• Low Supply Oil-Pressure Difference Protection: Monitors oil pressure to detect pump failure, leakage, or blockage, inhibiting start-up or shutting down the chiller if critical levels are reached.
• Oil-Temperature Protection: Shuts down the chiller if oil temperature exceeds maximum set points, indicating potential component overheating.
• Oil Pump Current Overload Protection: Monitors oil pump current and shuts down the chiller if it exceeds maximum limits.
• High Condenser-Pressure Protection: Prevents condenser pressure from exceeding a specified maximum, limiting inlet guide vane opening or shutting down the chiller.
• Low Evaporator-Pressure Protection: Maintains evaporator pressure above a minimum set point, limiting inlet guide vane opening or shutting down the chiller if pressure drops too low.
• Water Flow Protection: Detects loss of water flow, terminating the process or shutting down the chiller to prevent damage.
• Low Chilled Water Outlet Temperature Protection: Prevents evaporator freezing by pausing the chiller if the outlet temperature drops too low.
• Current Overload Protection: Monitors motor current and adjusts inlet guide vane opening or shuts down the chiller if current exceeds safe limits.
• High Motor-Winding Temperature Protection: Shuts down the chiller if motor winding temperature becomes excessively high.
• Start Time Limit Protection: Shuts down the chiller if the transition time during startup exceeds the set limit.
• Power Supply Protection: Detects and reacts to over/undervoltage, phase imbalance, phase loss, or phase reversal.
• Starter Failure Protection: Shuts down the chiller if the starter malfunctions and fails to disconnect the compressor motor in an emergency.

Centralized Control and Remote Management

Midea's intelligent control logic ensures system reliability by monitoring key parameters like chilled water outlet temperature, evaporating pressure, and condensing pressure to optimize load adjustment and operation.

The advanced control room and centralized controls integrate with Building Management Systems (BMS) for automation and energy management, coordinating air conditioners, fans, and water pumps for optimal energy use.

System Control Functions: Includes practical control modes (auto, remote, local), equalized operation times for extended service life, optimum operating schedules, system data reporting, and strategies for problem addressing. Remote communication via public open protocols enables data exchange with onsite energy management centers and upper BMS.

Energy Management: Features climatic feedback control, cycle duty operation, and load prediction control to reduce energy consumption and extend unit service life.

Diagrams illustrate the hierarchical structure of Midea's energy management system and the connectivity for centralized control.

Selection Software

Midea's independent software optimizes the configuration and performance of Midea products for HVAC systems. Users input parameters like cooling capacity and fouling factor to receive nominal data and physical data for various combinations. The software is continually updated with the latest product information.

Screenshots show the selection interface and a sample selection report for a Midea Centrifugal Chiller.

Reference Projects

Midea chillers have been successfully installed in a wide range of prominent projects globally.

Featured Projects:

• Guangzhou Baiyun International Airport: China, Guangzhou. Centrifugal chiller, 35,680 RT, completed 2016.
• Dalma Mall: U.A.E, Abu Dhabi. Centrifugal chiller, 10,000 RT, completed 2014.
• Indriyati Hospital: Indonesia, Solo. Super high efficiency centrifugal chiller, 2,800 RT.
• Hilton Hotel in Foshan (Five Star): China, Foshan. Super high efficiency centrifugal chiller, 3,700 RT.
• Beijing Capital Airport T3 Terminal: China, Beijing. Centrifugal chiller & Water-cooled screw chiller, 10,000 RT.
• Hartono lifestyle Mall: Indonesia, Yogyakarta. Centrifugal Chiller, 5,000 RT.
• Major Platinum Cineplex Laos: Laos, Vientiane. Centrifugal chiller & Water-cooled screw chiller, 2,000 RT.
• Pasar Turi Market: Indonesia, Surabaya. Centrifugal chiller, 4,000 RT.
• Shanghai Expo Venue: China, Shanghai. Centrifugal chiller, 3,000 RT.
• Harran University: Turkey, Sanliurfa. Centrifugal chiller, 3,300 RT.
• Federal Security Service: Russia, Moscow. Centrifugal chiller, 5,000 RT, completed 2015.
• Marriott Hotel (Five Star): China, Foshan. Centrifugal chiller & Water-cooled screw chiller, 1,900 RT.
• Hilton Hotel in Foshan (Five Star): China, Foshan. Centrifugal chiller & Water-cooled screw chiller, 4,500 RT.
• Worldon Factory in Vietnam: Vietnam, Ho Chi Minh. Centrifugal chiller & Water-cooled screw chiller, 4,500 RT.
• Shenzhen Metro Station: China, Shenzhen. Centrifugal chiller & Water-cooled screw chiller, 18,525 RT, completed 2015.
• Midea Headquarter Building: China, Foshan. VRF & Centrifugal chiller & Water-cooled screw chiller, 3,700 RT, completed 2010.

Photographs of these projects are included.

Reference Projects List

A comprehensive list of projects featuring Midea chillers across various countries and applications, including project name, country, city, HVAC type, and capacity.