Energy Simulation of Variable Refrigerant Flow (VRF) System for a building-


Variable refrigerant flow (VRF) has the ability to control
the amount of refrigerant flowing to each of the evaporators,
enabling the use of many evaporators of differing capacities and
configurations, individualized comfort control, simultaneous
heating and cooling in different zones, and heat recovery from one
zone to another. In the system, refrigerant flow control is the key
advantage it also allows the use of many evaporators of differing
capacities and configuration. Variable Refrigerant Flow (VRF)
System:-
VRV system has the ability to control the
amount of refrigerant flowing to the multiple evaporators (indoor
units), enabling the use of many evaporators of differing
capacities and configurations connected to a single condensing
unit. The control is achieved by varying the flow of refrigerant
through a pulse modulating valve (PMV). The indoor units are linked
by a control to the outdoor unit which responds to the demand from
the indoor units by varying its compressor speed to match the total
cooling and/or heating requirements. The new VRF system uses an
inverter compressor which is capable of changing the speed to
follow the variations in the total cooling/heating load as
determined by the suction gas pressure measured on the condensing
unit. Untitled

In
this, the compressor and condenser are the part of outdoor unit
while evaporator and expansion valve are the part of the indoor
unit attached with the distribution pipe.

Case Study:-

The performance
of VFR system is evaluated through energy simulation software Trace
for a practical office building running from 8:00AM to 7:00PM. This
building is in Jodhpur, Rajasthan which comes under the composite
climate of Indian context. The building has only one floor with
total area- 2500 m2. The orientation of the
building is in the west direction. The air cooled VRF system is
compared with the packaged terminal air conditioner with system to
maintain the indoor conditions-240 C temp.
& 60% RH and the results are as follows-  
          In the above
case study, simulative results shows that the VRF system is 28%
more efficient to save the energy for maintaining the same thermal
comfort in the building. Er. Sheelam Khare & Er. Rishikesh
Source- HVAC Variable Refrigerant Flow System, by A.
Bhatiya

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