1. Introduction of central air conditioning system VRV III of Daikin.
VRV stands for the English word "Variable Refrigerant Volume", meaning an air-conditioning system whose solvent flow can be changed through frequency regulation. Daikin is the first air conditioner manufacturer that invented this system and it has been more than 20 years with 3 generations of VRV I, II & III.
VRV III is an important improved version of VRV, marking a revolution in air conditioning technology for buildings. The latest technologies in air conditioning technology are applied to meet all customer requirements. The outdoor unit of this system consists of 1-3 compressors depending on the capacity, of which 1 compressor is controlled by an inverter (inverter) according to the principle: when changing the electrical frequency to the compressor motor, the speed The motor rotation changes, thus changing the refrigerant through the compressor, the ability to change the load of the inverter compressors is very wide because the electrical frequency can vary in the range from 52 to 210 Hz. As a result, the cooling capacity of the system can be adjusted in 62 steps for the 54Hp, allowing individual or linear control in each unit.
Normally, when choosing air conditioning equipment for high-rise buildings, it is often necessary to consider between the central or local option. Both of these two options reveal its disadvantages. For example, the installation of local machines with a large number of outdoor units will seriously affect the landscape outside the building, in case it is located in a hidden area (roof floor), it will not Satisfying the height and length allowed for installation. Conversely, if using the central machine system, issues such as increasing the floor structure, building machine rooms, requiring backup equipment ... Daikin VRV system was born, with new technology to Overcoming the above shortcomings, is the combination of outstanding features of the two systems to satisfy the maximum requirements of any project.
2. Advantages of Daikin VRV system
This is a refrigeration system that uses a gas-based thermal load, uses hidden heat to cool, cooled by wind, including many outdoor units that are assembled in series until the total cooling load for the whole building is met, each outdoor unit. Will be connected with many indoor units with 14 different designs and capacity ladders, making it easy to choose the right equipment to match architectural requirements, ensuring aesthetics as well as flexibility in the layout and distribution redistribution in later areas.
a) Due to wind cooling, the system can be installed anywhere, including places where there is no clean water source; on the other hand, it does not require additional equipment such as water-cooling systems (requires water pumps, cooling towers ...)
b) With inverter-controlled compressor technology, it is easy to adjust the cold load according to usage requirements, meaning that the actual cold load used will be much smaller than the total original design load, leading power consumption of the entire Daikin VRV system is also significantly reduced; in other words we only pay for what we use and electricity consumption will be precisely monitored thanks to the advanced functions of the control system.
The outstanding feature of Daikin VRV is the combination of the excellent features of both local and central refrigeration, shown in the fact that each outdoor unit is combined with multiple indoor units, but turning on or off the unit. This unit does not affect other indoor units and in general, this outdoor unit's shutdown or operation will not affect other outdoor units in the same system.
c) The system has a high degree of safety for the following reasons:
Daikin VRV system is capable of connecting to the building's fire alarm system; When a fire occurs, it will automatically cut off the power supply or in each area or the whole building.
+ Because the system does not use large wind pipes, it will limit the conduct of fire and spread of smoke in the event of a fire.
d) Pipe system:
Gas pipes connecting the indoor and outdoor units are just copper pipes with a very small cross-section (only 1/3 of the chiller pipe), thus minimizing installation costs as well as not requiring There must be large, solidly reinforced ceiling spaces to hang water pipes or ducts like other central systems. It is not the same as a plumbing system, requiring no additional equipment such as filtration equipment, stopper valve, 2-way, 3-way valve ...
On the other hand, the permissible pipe length between indoor and outdoor units is increased to a maximum of 165m and the maximum height difference is 90m (50m for outdoor units below 5hp), which can be satisfied for high-rise projects by Put all the outdoor units on the roof, thus saving room for the engine for other uses. Moreover, because the connection pipe is only a common gas pipeline, water leakage from the pipeline will be avoided. Due to the many different ways of branching, the system is able to accommodate installation arrangements in different locations.
e) Installation location of gas pipe and electrical control from 3 directions on the outdoor unit: front, side and below, depending on the installation method. This layout is very convenient for construction, installation and maintenance, even when the project requires many outdoor units installed side by side.
f) Auto check function to check for electrical problems and internal gas pipelines. With more than 60 error codes making repairing work much faster and easier.
h) Room temperature is precisely controlled with a very high degree of sophistication thanks to the PID (Propotional Integal Derivative) control system, with inverter and sensor sensor. LCD remote control multifunction screen, automatically changing cooling or heating.
Save operating costs thanks to: VRV system uses changing the flow of solvent in the system through adjusting the current frequency of the compressor, thus achieving high efficiency during operation, saving money. operating fee of the system.
Allows for separate control between clusters in the system, thereby reducing operating costs.
In one system, it is allowed to connect 1 outdoor unit with 18 indoor units with different cooling capacities and designs. The cooling capacity of these total indoor units allows to change from 50% to 130% of the outdoor unit's cooling capacity (up to 200% for some indoor units), so there is no need to have a spare machine. The system still works normally when one of the indoor units fails, on the other hand, the number of outdoor units will be less and this means that the owner has saved the cost of purchasing, warranty, maintenance of the outdoor unit as well as Space-saving where the outdoor unit is located.
3. Outdoor unit and outdoor unit models
Selected as a vertical outdoor unit with a compact and lightweight structure that can be placed in place for installation very easily. When the operation has little vibration, so there is no need to reinforce the floor where the machine is located, this also means that a significant saving is made for the owner. Each outdoor unit includes 1-3 compressors including 1 inverter compressor, so the owner does not need to worry when something goes wrong.
+ Daikin VRV III outdoor unit saves area with height difference of 40 meters when the outdoor unit is placed on high and 90 meters when the barrel is placed low.
+ Daikin VRV III outdoor unit saves an area with a height difference of 90 meters when the outdoor unit is placed on high. Since the majority of outdoor unit projects are located on the main terrace, the 40-meter height difference cannot accommodate some of today's large-scale projects, so this model was born as a new step forward for Daikin generation. VRV III and will be one of the new innovations for the next generation Daikin VRV IV.
+ Daikin VRV III energy-saving outdoor unit: The essence of this type is the way of joining the outdoor unit models together to save energy. Because the smaller the models, when put together, they will give more savings, but because these models are below 10 Hp, they are subject to special consumption tax, so the price will be very high.
4. Indoor unit models
The indoor unit has a variety of designs, designs and capacities for customers to easily choose from to suit their projects. See more indoor unit models here
5. Control system.
The system allows control in both ways: local and central. Specifically, each indoor unit will be controlled by an easy-to-use local remote. At the same time, providing convenience and creating comfort for users with features such as conventional air conditioning on / off, temperature control, fan speed, timer setting…. In particular, for the manager, the I-touch controller central control allows monitoring of the system's performance by monitoring, checking via the screen or networked with the processing center, capable of control the power consumption of each area or the whole building, set the operation mode for the whole system in a weekly, yearly cycle…. In particular, the self-diagnosing function is equipped on the controller for quick and easy handling to maintain the operating system continuously.
The I Manager III controller is capable of connecting and controlling up to 1024 indoor units, remotely monitored by a Web browser. Manage power consumption data remotely via web browser, send electronic error messages via email.
The ability to integrate with the building BMS system through the connection DMS502B51 (standard Bacnet) and DMS504B51 (Standard LonWorks) see more about the connection ruler.
6. Ventilation and heat recovery system
The HRV system has the function of ventilating and recovering the heat lost through the ventilation process. This system restricts the change in room temperature caused by ventilation, thus maintaining a high quality indoor atmosphere at all times.
HRV heat recovery ventilation system
In addition, HRV can be coordinated with Daikin VRV systems as well as other air conditioning systems.
Compact and lightweight unit: With a height of 306mm, the unit is easily placed in confined spaces, for example on a false ceiling. Large operating temperature range, Energy conservation, Air conditioning load reduced by about 30%.