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UAA-ST3

AIR COOLED CHILLER

Air-Cooled Single-Screw Chiller/High Efficiency Series

Air Cooled Screw

High-efficiency series ​

  • Model : UAA105-UAA450

  • Capacity : 105-450 TR

  • Compressor : Semi Hermetic Single Screw Compressor

  • Compressor No : 1/2

  • Refrigerant : R134a

  • Evaporator : Flooded Shell and Tube

  • Inverter : Not Available

  • Made In : China

​

  • Overview

Air-cooled water chiller/heat pump units are the central air conditioning units with air as the cold (hot) source, and water as the heat transfer medium. The units need no additional equipment room, cooling tower, cooling pump, or cooling pipe and can be mounted on the building roof and outdoors. The heat pump units can provide heat as a hot water boiler. This series of units are applicable to various environments, such as hospitals, hotels, factories, and office buildings.

 

As the designer and manufacturer of large air-cooled heat pump units, DAIKIN has been committed to technical improvement and innovation and leads the development of the air-cooled heat pump technology. For the consideration of environment protection and energy saving, DAIKIN applies the advanced technology to the latest ultra-efficient air-cooled heat pump units. By using the R134a refrigerant, this series of units have a full-load COP of over 3.2. This value is higher than the energy saving product certification standard, which makes them one of the most efficient, energy-saving, and quiet air conditioning units. Moreover, DAIKIN has built a large 1600 kW full performance lab to ensure the quality and performance of the units.

Overview Air-cooled water chiller/heat pump units are the central air conditioning units with air as the cold (hot) source, and water as the heat transfer medium. The units need no additional equipment room, cooling tower, cooling pump, or cooling pipe and can be mounted on the building roof and outdoors. The heat pump units can provide heat as a hot water boiler. This series of units are applicable to various environments, such as hospitals, hotels, factories, and office buildings. As the designer and manufacturer of large air-cooled heat pump units, DAIKIN has been committed to technical improvement and innovation and leads the development of the air-cooled heat pump technology. For the consideration of environment protection and energy saving, DAIKIN applies the advanced technology to the latest ultra-efficient air-cooled heat pump units. By using the R134a refrigerant, this series of units have a full-load COP of over 3.2. This value is higher than the energy saving product certif

  • Products Features

Advanced design and excellent performance

  • DAIKIN adopts R134a efficient single-screw compressor to greatly improve the efficiency.

  • New design of four-way (see figure 1) valve lowers the pressure drop. Over-compress technology significantly improves the four-way valve reliability. This design avoids short circuit. In this way, units’ efficiency and stability is much better.

  • The new economizer (see figure 2) design increases the unit sub-cooling, greatly promotes the unit’s cooling capacity and COP. Unit full load COP is up to 3.2, and higher COP under part load.

  • New high efficiency counter-flow shell & tube dryexpansion single pass evaporator (one or two internal independent refrigerant circuits) Super-high evaporate temperature, higher heat exchanging efficiency.

Advanced design and excellent performanc
Stepless adjustment, high efficiency, an

Stepless adjustment, high efficiency, and energy saving

  • The advanced efficient single-screw compressor is adopted. The compressor can perform stepless adjustment within the range of 10% to 100% workload at maximum. Compared with the traditional compressors, this compressor has wider adjustment range and higher efficiency.

  • The temperature of outlet water is stable. The output ability meets the workload demand of the construction system. The units can regulate the output based on the actual workload and maintains high efficiency when running at partial workload. In addition, the accurate adjustment of the energy and water temperature brings more comfortable experience to customers. (See figure 3)

  • The temperature of outlet chilled water is controlled to ± 0.5°C. In addition, various sensors in the system can transmit various kinds of signal data to the controller to implement timely protection for the unit components and ensure more reliable operation.

  • The mechanism of three-level password protection ensures safe operation of the units and prevents misoperations of non-professional personnel.

R-134a Refrigerant

  • No Chlorine ODP=0 Good Efficiency (See figure 4)

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New-high efficiency condenser fans (tech

Low operation sound and vibration

  • New high efficiency (full and part load) DAIKIN Single Screw compressor. (technology by DAIKIN) Through meshing between metal and nonmetal, it eliminates the high frequency noise. And with fewer moving parts and rotor load balance, it decreases vibrations. With a shock absorber, noise and vibrations are lowered further.

  • Integrated design and compact structure are adopted for the units. The base can balance the entire unit weight. The spring-damper on the units helps to eliminate the operation sound and vibration.

  • New high efficiency condenser fans (technology by DAIKIN) Condenser using high efficiency, low noise resin spiral fan motor, direct drive, 3dB(A) noise lower compared with spiral blades. (See figure 5)

Easy installation and simple maintenance

  • Flexible installation without additional equipment room, cooling tower, or cooling pump.

  • The electric system of the units is integrated with the main unit, so an additional electric control cabinet is not required.

  • An intelligent control system monitors and controls the operating status of the units and indicates the fault cause for the convenience of maintenance.

Accurate control and reliable operation

  • An advanced electrical expansion valve enables the units to control the refrigerant flow accurately, adapt to various working conditions, and perform multiple control functions.

  • Compressors start up one by one with a low startup current, to reduce the impact on the power grid.

  • Multiple protection functions ensure safe operation of the units.

  • Intelligent Network Controller

The units adopt the new-generation DAIKIN controller Micro Tech III. (See figure 6) This controller integrates the heat pump applications and technologies of DAIKIN of more than 40 years and is equipped with programmable software. This enables compressors and fans to reach the highest COP.

Main components

Built-in controller

  • Control type: PLC programmable

  • Operation language: Chinese/English

  • Screen display: LCD display

  • Operating environment: Temperature: -20°C~60°C Relative humidity: < 90%.

External remote monitoring (Option).jpg

Network control

  • Multiple communication ports such as the Modbus, LonWorks, and BACnet can be added to the controller for integrated control or automatic building control to implement joint control of multiple units (optional).

Operating status query

  • Dual control

  • Unit status

  • Temperature of inlet/outlet water

  • Compressor status

  • Suction and discharge pressure

  • Temperature and superheat of suction and discharge

  • Openning of electrical expansion valve

  • Oil pressure

  • Ambient temperature

Main Functions

  • Automatic load/unload based on changes of the actual air conditioning load

  • Operating status display of the units

  • Common fault alarm display

  • Water temperature control to an accuracy to 0.5°C

  • Output load PID control

  • Balancing the operating duration of each compressor

  • Compressor load control

  • Three-level password protection

  • Stepless load adjustment

  • Failure history query

Protection functions

  • High pressure protection

  • Low pressure protection

  • Fan overload protection

  • High discharge temperature protection

  • Compressor overload protection

  • Low compression ratio protection

  • High oil pressure difference protection

  • Sensor failure protection

  • Compressor startup failure protection

  • Phase protection

  • Evaporator anti-freezing protection

  • Water flow protection

  • DAIKIN high-efficiency single-screw compressor

(intended for R134a refrigerant)

semi hermetic.jpg

Features

DAIKIN leads the single-screw compressor (See figure 8) technology. The Semi-hermetic compressor features high efficiency, energy saving, quiet operation, few moving components, and long service life.

  • Few moving components DAIKIN single-screw compressor consists of only five moving components: a screw rotor, two star wheels, and two energy adjustment slide valves. The screw rotor is a six-tooth aluminum coated steel component. The star wheel is an eleven-tooth component made of high-strength composite material.

  • Long duration and high reliability The star wheels made of high-strength composite material can ensure the accuracy and the minimum gap and guarantee operation without wear and tear. The oil injection and liquid injection design of the compressor minimizes air superheat and eliminates the possibility of oil and refrigerant decomposition due to superheat.

  • Simple maintenance The removable side cover of the star wheel box simplifies the routine inspection without the need of removing and installing pipelines. Such a design facilitates the check of the internal components of the compressor.

  • Low operation sound and vibration DAIKIN single-screw compressor can balance the load completely during its operation. Therefore, the vibration can be ignored because the noise value is lower than the industrial standard. The compressor does not contact with any metal during compression so that no high frequency noise is generated. The special-shaped air discharge cavity helps eliminate noises effectively.

  • Unique star wheel and rotor design The star wheel of DAIKIN single-screw compressor is made of special materials that can avoid metal engagement between the star wheel and rotor. The small engagement gap and low engagement resistance implement “zero gap" engagement. The unique oil supply system that uses the oil pressure difference function enables more efficient sealing, lubrication, and cooling of the compressor. In this way, the engagement resistance is further reduced and the efficiency of entire units is improved.

  • High-efficiency oil separator The application of high-efficiency oil separator increases the oil separation rate to 99.7%. The “oil leakage" problem during the compression is resolved, and the reliability and efficiency of the compressor is improved.

SPESIFIKASI

  • Cooling Only - High efficiency series

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