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Comparison of Energy Performance of Variable Refrigerant
Flow Based Unitary Air Conditioner with Constant Volume AConditioner
By
Anant Joshi
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Objective: - To study and comparatively analyzes t
performance of a Variable Refrigerant Flow based Unitary A
Conditioner with Constant Volume Air Conditioner using th
field performance testing and simulation model.
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AC Current
Inverter
AC to DCconversion
DC to 3 Phase DCConversion
Reluctance DCMotor
Variablefrequency
controls themotorspeed
Swingcompressor
Working of VRF based Unitary AC
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Schematic view of the inverter principle(Source: Service Manual Daikin inverter pair)
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Swing Compressor
Source: https://www.youtube.com/watch?v=KjzJ
Video Animation of Working
https://www.youtube.com/watch?v=KjzJqzKx2V0https://www.youtube.com/watch?v=KjzJqzKx2V08/22/2019 Comparison of Energy Performance of Variable Refrigerant Flow.pptx
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Experimental Setup
Description
Construction details:
1. Wall: 4 Single Brick wall with cemen
2. Window: 2mm clear glass with wind
blinds
3. Roof: Fiber cement pitched roof with
300slope
4. Falls ceiling (floor to ceiling height 9
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Details of Equipment
DESCRIPTION UNIT
MODEL
(Indoor/Outdoor)5016
5016
CAPACITY TR 1.5
EER KW/KW 3.4
STAR RATING 5 STAR
MOISTURE REMOVAL Lt/H
AIR CIRCULATION m3/min 17.5
OPERATING VOLTAGE V 230
RUNNING CURRENT A 6.8
POWER INPUT W 1,530
DIMENSIONS/NET WEIGHT
H X W X D
mm 290/1,050/238
Kg 12
mm 595/785/300
Kg 38
NOISE LEVEL db 45/35
CONNECTION PIPE SIZE
GAS/LIQUID
mm 15.88/6.35
Inch 5/8-1/4
CONNECTION METHOD FLARE
MAX PIE LENGTH/HIGHT METER 30/15
DESCRIPTION UNITMOD
inver
Capacity Rated (Min.-Max.) kW5.2 (1
Power consumption Rated (Min. -Max.) W1.600
COP Rated W/W3.25
Air flow rate (H) M3/min (cfm)16.8
Fan speed5 set
auto
Sound levels (H/L/SL) dB (A)44/3
Dimensions (H x W x D) mm290x
Machine weight kg12
Compressor Type Hermetically sealed sw
Motor output W150
Refrigerant charge (R.22) kg1.2
Sound levels (H/L) dB (A)47/
Dimensions (H x W x D) mm 73
Operation range 0CDB
Max. Piping length m30
20
Non VRF AC VRF AC
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Make and Model Usha HC 423
Heating Application Air inlet vents
Heat Settings 3 (665W/1330W/2000W)
Type Heat Convector
Additional Features2- speed motor , Adjustable height , Night light
indicator
Thermal Cutoff Safety Device Yes
Carrying handle Yes
Castors No
Power Requirement
Power Consumption (Watts) 2000
Voltage (Volts) 230
Auxiliary Heating Equipment
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SIMULATION MODEL
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Performance Table of VRF AC
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Cooling Performance Curves
Cooling Capacity Ratio as a Function of Outdoor Drybulb and Indoor Wetbulb Temperat
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Source: Energy Plus Engineering Referen
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Cooling Energy inputRatio as a Function of Outdoor Drybulb and Indoor Wetbulb Temper
Cooling Performance Curves
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Cooling Load profile of Zone VRF and Zone Non VRF AC in Febru
March
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Cooling Load profile of Zone VRF and Non VRF in April
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Cooling Load profile of Zone VRF and Non VRF in May
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Zone Avg Temp Profile of VRF and Non VRF AC throughout a
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Plot of hourly Variations of Energy Consumption and Outdo
Temperature
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Hourly Saving of VRF AC and hourly variations of Outdoor Temp
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Hourly Variations of Electrical Load of both AC systems and Ou
Temperature
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Daily Energy Saving of VRF AC with Mean, Max and Avg Outd
Temperature
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Daily Energy Consumption with Mean, Max and Minimum out
Temperature
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Performance of AC systems at Low outdoor temperature
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Performance of AC systems at Low outdoor temperature
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Performance of both AC systems in moderate outdoor condit
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VRF systems meet the zone set point without significant fluctuations in the zone
temperature whereas in constant volume system fluctuations of 2 0C wereobserved.
Energy savings up to 40% are measured in VRF system at moderate temperature
conditions however at high temperature conditions VRF AC consume more powe
compared to the constant volume AC.
VRF AC only gives energy saving at part load conditions, therefore VRF technolog
must be used only where the AC runs most of the times at part load conditions. In VRF systems electric load only changes when heat load on the system change
there is no cyclic fluctuation in electric load profile. Whereas in a constant volum
system there is frequent variation in the electric demand load due to its ON OFF
operation.
CONCLUSIONS
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