MERITS, DEMERTIS
Depending on the buil Requirement unit to analyse the requirement of what exactly going to be Installation
MERITS -VRF (VARIABLE REFRIGERANT FLOW)
Different IDU options can be used like hiwall unit,Cassette unit,concealed unit,ducted type units and so on this can help in blending the air Conditioning system with the appropriate interior design of the space.
Operation is very simple,probably is simple as operating a split air conditioning system and heance no separate man power is required for operating the system.
Good option for providing air conditioning to apartments,villas,small installations where in the complexity to the system (major demerits of this system) Can be kept to a minimum.
DEMERITS OF VRF
- Complex system architecture, large amount of refrigerant piping running around in conditioned space.
- If decided to use for larger capacities more space required to install many number of ODUs.Access to ODUs is necessity as all the maintenance work required will be mostly on the ODUs
- Will not be of much benefit where the cooling load has limited diversity.such as in offices,malls,multiplexes etc........where in the diversity is limited to some conference rooms and or Cafeterias
- Highly skilled labor required for installation and commissioning and maintenance, Especially to identify and correct leakages.
- Not recommended for High rise building the Compressor will be very big to over come additional piping and pressure loss.
- Identifying pipes and their leakages complication for High rise building the system not suitable.
MERITS OF AIR COOLED CHILLER
- The most matured technology with the history of over 6 decades.
- Highly energy efficient enables comfortably complying to ASHRAE,AHRI and LEED,platinum requirement
- With proper system design and installing multiple chillers, Even in case of high diversity chillers become a good option due to their good efficiency even at part load conditions
- Project size is not the constraint at all
DEMERITS OF AIR COOLED CHILLER
- Availability of water is a must
- Requires additional space for plant room for Chiller,AHU Rooms and space for mounting the cooling towers
- Trained man power is required for operating the central chiller plant
- Highly skilled labor required for installation and commissioning and maintenance,Especially to identify and correct leakages
CONCLUSION OF VRF
For smaller system's,up to 100-200tr with limited ODUs and IDUs VRF System can be a good solution,as for smaller central plant system,space availability for Chillers,AHUs may not be available.also for such small systems the VRF System can remain simple with limited refrigerant piping and with out much complexities
CONCLUSION OF CHILLER
How ever when the installation size starts increasing VRF Systems,As seen above start becoming complex and in such cases,planning the installation for aicooled chiller is always beneficial.The life cycle cost such a system is not only lower then the VRF System, But it also avoids safety related issues such as leakages of refrigerant in conditioned space, Better air circulation,better indoor air quality, etc........
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