Comparison of Energy Performance of Variable Refrigerant Flow.pptx

8/22/2019 Comparison of Energy Performance of Variable Refrigerant Flow.pptx

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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=KjzJqzKx2V0


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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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Comparison of Energy Performance of Variable Refrigerant Flow.pptx

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