Comparison of the performance of air-cooled modules, water-cooled screws and VRV multi-connectors
I. Modular air-cooled chilled (hot) water unit
Air-cooled modular chiller-heater unit is a central air-conditioning unit that uses air as the cooling (heat) source and water as the cooling (heat) medium. As the integrated equipment of both hot and cold, the air-cooled modular hot and cold water unit omits many accessories such as cooling towers, pumps, boilers and corresponding piping systems, etc. The system structure is simple, the installation space is small, the maintenance and management are convenient and energy-saving, and it is widely applicable. Therefore, the air-cooled modular chiller-heater unit is usually applied to neither heating boiler, nor heating network or other stable and reliable heat source, but also requires year-round air conditioning of HVAC projects, is the design of the preferred option.The centralized and semi-centralized central air-conditioning system composed of host and fan coiler, air-conditioning box and other end devices has the characteristics of flexible arrangement and diversified control methods, which is especially suitable for shopping malls, hospitals, hotels, factories, office buildings and other occasions. Air-cooled modular hot and cold water units with standard water pipe interface and unit combination control function, so that the unit runs freely. [Source:Refrigeration Encyclopedia Public]. After installation, connect the power supply and water line can be used. When the air conditioning area increases or decreases and the host needs to be increased or decreased, it is more obvious that it is convenient and easy to use.
Advantages:
The initial investment in equipment is about 15% cheaper than inverter multi-connected (VRV);
Cooling capacity adjustment range is large, but can realize the step or stepless adjustment;
Mature technology, long life, no need for a special room, can be installed directly on the roof or outdoor space;
Simple system structure, small installation space, especially suitable for water shortage areas;
Saving the huge ancillary equipment or accessories such as cooling tower, water pump, boiler and corresponding piping system;
There are two sets of independent working systems, and a fault in one of the systems will not affect the normal operation of the whole machine;
The indoor air is cooled by water so that the relative humidity of the air is kept within the range of human comfort.
Disadvantages:
In cold areas (such as the northeast) heating to be equipped with electric auxiliary heating equipment;
Every year must be a maintenance and equipment cleaning.
Second, VRV frequency conversion multi-unit
VRV air conditioning system is called variable refrigerant flow system, the system structure is similar to the split air conditioning unit, using an outdoor machine corresponds to a group of indoor machines, control technology using frequency control, according to the number of indoor machines open to control the outdoor compressor speed scroll compressor speed, refrigerant flow control.
VRV air conditioning system and all-air system, all-water system, air - water system, compared with more to meet the user's personalized use of the requirements of the equipment occupies less space in the building, but also more energy-efficient, it is because of these characteristics, it is more suitable for those who need to be often used independently of overtime office building construction projects, VRV air conditioning system also has a centralized control of the management link, [ Source:Refrigeration Encyclopedia Public], can be in the control room on the remote groups of VRV air conditioning system monitoring and management, is a more complete control, for a building has been designed building automation system (BAS) intelligent building, can be any reasonable, maximize the function of its system, reduce the duplication of investment in the system equipment, and improve the technical capabilities of system integration.
Advantages:
The multi-connected system can automatically adjust the speed of the compressor to change the refrigerant flow rate according to the change of the system load to ensure that the unit operates at a higher efficiency. Energy consumption is reduced during part-load operation, and the annual operating costs are lower.
The receiver of the multi-connected system is only refrigerant pipe and condensate pipe, and the refrigerant pipe arrangement is flexible and easy to construct, compared with the centralized air-conditioning water system, in the case of meeting the same indoor ceiling height, the use of multi-connected system can reduce the building height and reduce the cost of the building.
Multi-connected system construction workload is much smaller, shorter construction cycle, especially for engineering renovation. The system has fewer links, all equipment and control devices are provided by the equipment supplier, the system operation and management is safe and reliable.
Multi-connected system combination is convenient and flexible, can be used according to different requirements to organize the system, to meet the use of different working conditions of the room requirements.
Can be wired/wireless/centralized control/remote centralized monitor, high precision temperature control; fault self-diagnosis, simple and perfect self-diagnostic function; equipment in the operation process, no need to specialize in maintenance, and effectively reduce the cost of equipment maintenance.
Disadvantages:
Equipment cost is high;
Heat exchange between refrigerant and air, large temperature difference between supply and return air, high air dryness, poor comfort;
The system has many joints, which can easily lead to the leakage of Freon, and also ice blockage will be formed as a result, hindering the circulation of refrigerant and affecting the refrigeration (heat) of the unit;
More systems, maintenance, and refrigeration leakage is not easy to detect, maintenance is difficult.
Screw chiller
Screw chiller is to draw on the latest research results in the fields of automatic control, refrigeration, heat and mass transfer, multi-phase separation and other engineering fields at home and abroad, after many years of exploration, research and development of high-efficiency, energy-saving air-conditioning cold source equipment, with a large temperature difference, ice ice cold storage, heat recovery, once the pump changes the flow rate of a variety of optional configurations, and its comprehensive performance has reached the international advanced level to meet the needs of various needs, not only for the hotels, hospitals, pharmaceutical factories, Theaters, gymnasiums, entertainment centers, commercial buildings, office buildings, industrial and mining enterprises and other places in the central air-conditioning system to provide cold water, but also for the textile, chemical, food, electronics, scientific research and other industries to provide process chilled water.
Advantages:
Compression ratio can be high, EER value is high, energy coverage is wide, and the user has a large choice;
Through the slide valve adjustment to realize the smooth adaptation of the unit to the air conditioning load changes, no asthma phenomenon, low maintenance costs, long motor life;
It can be adjusted steplessly in the range of 10%~100%, with high efficiency at partial load and significant power saving.
Positive pressure operation, there is no corrosion problem of external gas intrusion;
Insensitive to wet stroke.
Disadvantages:
The price is on the high side;
Complicated lubricating oil system, high oil consumption;
High noise;
High assembly precision, complex installation and commissioning;
High running cost in the later stage.
Xinxiang Yukun Refrigeration Technology Co. is a production and sales of refrigeration two apparatus parts and sheet metal products, mainly engaged in condenser, evaporator, heat exchanger, reservoir, filter drier, fin evaporator (condenser), stamping parts, sheet metal parts, aluminum tubes for refrigeration, etc.
Our company has always had strict quality control standards in the market of refrigeration and heat exchange equipment, focusing on providing customised services to our customers. Not only do we have high requirements for the selection of raw materials, but we also keep up to date with the latest production processes and have high testing standards.
Our company mainly produces products for:Fin Evaporator.Fin Type Condenser.Capillary Tube. Coolant Reservoir.Plate Reinforcement Parts.Stamped Parts.Aluminum Tube.Instrument Testing Equipment.
Supermarket Refrigeration Show Case Copper Condenser Coil
1. OEM or ODM can be accepted
2. Fin type: Louver or corrugated
3. Be customerized according to samples and drawings.
4. High quility and low price and energy saving 60% (CE, RoHS, EMC and ISO9001 certification) The CD series products can be used in Various specificantion Condensing Units .
They are air cooled heat exchangers for refrigeration system. They are divided in 4 group:CD,CDC,CDS and CDV.All the products have been tested on 2.8MPa air leakage,and the system is disposed of pollution,applicable to R22,R134a,R404A,R407C systems.
Our company mainly produces products for:Fin Evaporator.Fin Type Condenser.Capillary Tube.Aluminum Coolant Reservoir.Plate Reinforcement Parts.Stamped Parts.Aluminum Tube.Instrument Testing Equipment.
Supermarket Refrigeration Show Case Copper Condenser Coil
1. OEM or ODM can be accepted
2. Fin type: Louver or corrugated
3. Be customerized according to samples and drawings.
4. High quility and low price and energy saving 60% (CE, RoHS, EMC and ISO9001 certification) The CD series products can be used in Various specificantion Condensing Units .
