Variable refrigerant flow/Volume (VRF/VRV) systems vary the flow of refrigerant into indoor units based on demand of each unit. This algorithm to control the amount of refrigerant that is supplied to each indoor units located inside the building makes the VRF/VRV technology ideal for applications with varying loads or.
VRF systems are available either as cooling only or heat pump systems or as heat recovery systems for those applications where simultaneous heating and cooling is required. In addition to offering superior comfort, VRF/VRV systems offer design flexibility, energy efficiency, space savings and cost effective solution.
In a Mitsubishi Heavy Duty VRF VRV system, multiple indoor units can be connected to one outdoor unit. The outdoor unit can have one or more scroll compressors that are inverter driven type, so their speed can be varied by changing the frequency and voltage supply to the compressor. As the compressor speed changes, so does the amount of refrigerant R410 delivered by the compressor. Each indoor unit has its own electronic device that is controlled by the outdoor unit microcontroller. As each indoor unit sends signal to the outdoor unit, the outdoor unit supplies the amount of refrigerant required to meet the each indoor requirements, based on temperature set point.
These features make the VRF VRV system ideally suited for various applications that may have part load requirements based on ambient temperature, usage or building orientation, as well as applications that require both hot and cold.
The key to offering comfort is to control heating or cooling precisely without over or under of set temperature. In conventional systems, the compressor is varying from on or off, so even areas that have individual AC’s experience variations in room temperature as the compressor stops and then starts repeatedly to maintain set temperature.
In a Mitsubishi Heavy Duty VRF VRV system, since the speed of the compressor can be varied continuously, the compressor does not repeat on and off, but operates continuously at variable speed. The required refrigerant flow is supplied to each indoor unit and based on the set point of each unit; the refrigerant flow is adjusted to maintain the room temperature precisely without fluctuation. Each indoor unit fan speeds, temperature set points and louver positions can be varied independently to provide additional comfort in the space.
One of the key advantages of a VRV/VRF system is the flexibility offered by the various type and size of indoor and outdoor units. A VRF VRV system can be combining using any outdoor units, ductable units, 4-way cassette type and hi-wall type to create new design conditions for varies applications within the same building.
When selecting a VRF system, we must keep in mind that not all systems have the same piping limitations. Systems that offer extended piping capabilities will maximize the application flexibility provided by the VRV/VRF technology.
Important considerations when reviewing piping capabilities are:
1) The maximum height difference allowed between the highest and lowest indoor units on a single outdoor system.
2) The distance from the outdoor unit to the farthest indoor unit on the system.
All VRV/VRF systems provide energy savings by adjusting compressor speed and matching the demand and supply of the system as closely as possible.
Variable Temperature and Capacity Control (KX)
Mitsubishi Heavy Duty VRF VRV system Outdoor units with multiple inverter-driven scroll compressors, offer the most complete set of advantages achievable with a VRF system. The system with 2 inverter-driven compressors also provides greater back-up capability.
If one of the compressors fails, the system will continue to operate at 50% of its original capacity, and comfort will be maintained in the conditioned space until the faulty compressor can be replaced.
The starting sequence of the compressors is rotated, equalizing their operating time and thereby minimizing excess operation of an individual compressor, which is not the case in some brands. Multiple inverter-driven compressors allow the unit to provide better part load performance without the need to use hot gas bypass. Under part load conditions, the system has the advantage of running only as many compressors at desired speed is required to achieve the capacity necessary to fulfill the load requirement and maintain comfort within the conditioned space.
The design of a VRF system starts with understanding the space layout and the orientation of the building along with the seasons during which peak loads occur may be occur. The type of heat load (heating or cooling) and the distribution of loads into zones will depend on the intended use of the area. In turn, these factors will determine whether a heat pump system or heat recovery system will be the most effective choice.
Type of System — Heat Recovery or Heat Pump?
A heat recovery system is applied where simultaneous heating and cooling is required. The highest efficiency will be achieved when both the heating and cooling loads are equal, by maximizing the amount of energy that can be transferred from one zone to another using the same refrigerant circuit and components.
To determine the best design choice, an efficiency analysis and cost comparison of the two options should be done as there is big cost increase in choosing heat recovery systems.
Flexibility of the piping options available should be considered. A system that provides more options for combining Y-shape joints and headers could minimize the amount of piping and refrigerant used, thus reducing the total cost of the job.
One of the major advantages of a Mitsubishi Electric Heavy Duty VRF VRV is its compact size and flexibility. A VRF system is a modular system, which can be moved in indoor and outdoor modules and then connected with refrigerant piping network. There is no need for a large maintenance room or service shafts. Distribution fans, hefty pipes to circulate chilled water and condenser water with pumps are not required for its operation.
Besides these benefits of a VRF system providing for an easier install, it also results into lesser space for air conditioning system and giving out more space for our use.
Since VRF systems do not normally require ducts and use relatively small air handlers, it gives you more flexibility for handler locations and eliminates the need to take up wall and ceiling space for large ducts. This is important to the one who does not want to introduce ductwork into high ceilings. If you’re having constraint for space as is the case with many office buildings, a VRF system is a space-saver
because ductwork and mechanical rooms are not necessary.
Another major advantage of a VRF system that has been developed over a period of time with the entrance of IOT in our life and smart phones. With mobile applications, you can actually use your mobile device to set temperature settings for each unit. This is luxury for residential applications while necessity for commercial establishment, where bulky building management software are mandatory to control entire building from one place.
The monitoring of more than 200 AC’s in a building can be controlled with a click and can be even grouped together for each zone wise. With internet being part of our buildings, multiple people can get access to the control at the same time, while on the move.
Inarguably, one of the big benefits of a VRF system is they tend to break down less frequently compared to a conventional AC. With Mitsubishi Electric Heavy Duty VRF VRV units designed to handle the extreme hot Indian summer together with minimum deration in capacity. The system’s ruggedness and durability not only delivers best performance in scorching heat but also wear and tears least compared to traditional AC’s.
There is less stress on the moving parts because VRF systems are designed to run only needed and under partial load conditions. The big condenser coil allows dissipating the heat even at an ambient temperature of 55 Deg C effectively.
Mitsubishi Heavy Duty VRF VRV has sales and service dealers (SSD) network spread across the country, KPS Electro is leading SSD for Delhi NCR region and will be happy to serve you in the best possible way. We are Head Quartered at Mehrauli-Badarpur Road, Lal Kuan near tuklakabad container depot and have branches at Noida and Gurgaon as well.
Mitsubishi Heavy Duty VRF VRV offers best in class after sales service support in the industry, we have got a team of engineers and technicians for 24 Hrs support within a response time of 3 hrs within Delhi NCR.
The team is well trained and equipped with best service tools for early diagnosis and faster resolution of any service call. The spare parts minimum inventory level are maintained are kept in the vicinity of service centre in case of any replacement part required, even at odd hours and weekends.
The round of clock service assures peace of mind not only to customers but also builds up confidence in choosing us as a best in class service provider in the industry.
GENUINE SPARES & SERVICE CENTERS
Service is said to be a thankless job, but for air-conditioning business to survive, it is the first priority when choosing a system. Due to the weather conditions we receive in the northern part of the country, the air conditioner is the lifeline of any building residential commercial, institutional etc.
The turnaround time from breakdown to up and running is the time when even breathing becomes difficult in an enclosed building with least ventilated.