Mitsubishi Electronics PE-7MYC, PE-8MYC manual Efficiency Calculation, Calculation of net capacity

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(Step-3) Calculation of net capacity

Based on the indoor conditioned temperature (WB,DB), designed outdoor temperature (DB), and the actual air flow obtained in Step-2, obtain the gross capacity from the gross capacity tables (pages 16~35). Then, calculate the net capacity from the formula below by using the fan motor input obtained in Step-2.

Net capacity (kW) = Gross capacity (kW) - Fan motor input (kW)

Example: PE-8MYC

Condition:

Indoor conditioned temp. : 26˚CDB, 19˚CWB

Designed outdoor temp. : 40˚CDB

Actual air flow : 77CMM

Fan motor input : 0.6kW (See P.11)

Calculation :

The sections of the gross capacity table applicable for the above conditions are shown right.

At 26˚CDB, 19˚CWB of Indoor,

Q = 21.3, SHC = 16.3, T/I = 8.3

 

 

OUTDOOR DB˚C

INDOOR

INDOOR

 

40.0

 

 

DB˚C

WB˚C

Q kW SHC kW SHF T/I kW

26

19

21.3

16.3

0.77

8.3

Factor for Various Air Flow

PE-8MYC-EU

AIR VOLUME

CMM

60

70

80

L/S

1,000

1,167

1,330

 

 

COOLING

CAPACITY

0.976

1.0

1.025

TOTAL INPUT

0.991

1.0

1.009

 

 

SHC

0.963

1.0

1.044

Therefore, when air flow is 77(CMM)

 

 

Q = 21.3 (1+(1.025 - 1.0) 7/10*)

21.7(kW)

 

SHC = 16.3 (1+(1.044 - 1.0) 7/10*) 16.8(kW)

 

T/I = 8.3 (1+(1.009-1.0))7/10*)

8.4(kW)

Note * : 7/10 = (77-70)/(80-70)

Therfore, the net capacity is,

Net total cooling capacity = 21.7 (kw) - 0.6(kW) = 21.1 (kW)

Net sensible cooling capacity = 16.8 (kW) - 0.6 (kW) = 16.2 (kW)

2.Efficiency Calculation

Refrigerant cycle energy efficienty

Gross total cooling capacity (kW)

(1) COP =

• System energy efficienty

Net cooling capacity (kW)

(1) COP =

Compressor input (kW)

Gross total cooling capacity (kW)

(2) ERR =

Total input (kW)

(2) ERR =

Compressor input (kW)

Net cooling capacity (kW)

Total input (kW)

1kW = 3412Btu/h

Notes: 1. COP : Coefficient of performance

2.EER : Energy efficiency ratio

3.Temperature condition of COP, EER (ARI Standard Ratings) Indoor entering air temp. : 80˚FDB (=27˚CDB), 66˚FWB(=19˚CWB) Outdoor entering air temp. : 95˚FDB (=35˚CDB)

4.Total input = Compressor input + Indoor fan motor input + Outdoor fan motor input (page 11).

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Contents Data Book Contents Safety for USE For correct installationDo not wash the unit with water Indoor unit Complete Line UPOutdoor unit Features DescriptionsMechanical Specifications Typical Installation ExampleMODEL-DESIGNATION Breakdown 10 M Y CSpecifications PE-7~20MYC Cooling onlyPEH-5,7,8MYA Heat pump PEH-10,15,20MYA Heat pump Electrical Data PE-7~20MYC-EUPEH-5,7,8MYA-EU HeatingPEH-10,15,20MYA-EU Selection Procedure Model Selection With actual examplesEfficiency Calculation Calculation of net capacityCooling Capacity Standard Air Flow Capacity TablesFactor for Various Air Flow Heating Capacity Standard Air Flow PE-7MYC-EU , PEH-7MYA-EU PEH-7MYA-EU PE-8MYC-EU , PEH-8MYA-EU combined with PUH-8MYC1-EU PEH-8MYA-EU Use for low ambient cooling partsPE-8MYC-EU , PEH-8MYA-EU combined with PUH-8MYE-EU PE-8MYC-EU , PEH-8MYA-EU combined with PUH-8ME-EU Combined with PUH-8MYE-EUPE-10MYC-EU , PEH-10MYA-EU combined with PUH-10MYC1-EU PEH-10MYA-EU PE-10MYC-EU , PEH-10MYA-EU combined with PUH-10MYE-EU Combined with PUH-10MYE-EU PE-15MYC-EU 976 PEH-15MYA-EU 989 011 PE-20MYC-EU Use for low ambient cooling parts PEH-20MYA-EU PEH-20MYC-EU AIR Volume CMM Operation Range CoolingFAN Performance PEH-5MYA-EUPE-7MYC-EU PEH-7MYA-EU PE-8MYC-EU PE-10MYC-EU PEH-8MYA-EU PEH-10MYA-EUPE-15MYC-EU PEH-15MYA-EU PE-20MYC-EU PEH-20MYA-EUPulley outside dimensions are shown below Unit mm Sound Data Position mesurementIndoor units Outdoor unitsPEH-5 Outline DimensionsPEH-7,8 PEH-10 PEH-1528.6 DRAINRc HOLES26PEH-20 Flange HOLES28PUH-5 PUH-7,8,10 Upper blowHoles Holes 2-ø15 Ø19.053/4PUH-8,10 Side blow PU-15Ø15.885/8130 Refrigerant Pipe PUH-8ø25.41 PUH-10ø28.61-1/8 Cable Entry 44 Holes 2-ø15PU-20 PUH-15,20Ø28.61-1/8 Ø15.885/8 Holes 6-ø15 Control Cable Entry ø27Duct work is local supply Wiring Diagrams PE-7MYC-EU StandardInternal thermostat indoor fan PE-8,10MYC-EU StandardOver current relayfanI/D,O/D PE-15MYC-EU Standard PE-20MYC-EU Standard TB1PE-7MYC-EU Special Order Anti Short Cycle Timer PE-8,10MYC-EU Special Order Anti Short Cycle Timer Internal thermostatindoor fanPE-15MYC-EU Special Order Anti Short Cycle Timer PE-20MYC-EU Special Order Anti Short Cycle Timer Symbol Name MC1,2 Compressor motor23C Ambient temperature PE-7MYC-EU Special Order LOW Ambient Cooling52F1 Contactor fan I/D 49F Internal thermostatfan O/DPE-8,10MYC-EU Special Order LOW Ambient Cooling PE-15MYC-EU Special Order LOW Ambient Cooling Do not change factory set value of Over current relaysAuxiliary relay fanI/D PE-20MYC-EU Special Order LOW Ambient Cooling30FZ Auxiliary relay fanI/D PEH-5MYA-EU Standard MF2PEH-7MYA-EU Standard Thermostat defrostWay valve Option controller connectionC1~7 PEH-8,10MYA-EU StandardCR1 Surge killer PEH-15,20MYA-EU Standard MF2 Cool Heat CR1 Surge killer Timer Anti short cycle PEH-8,10MYA-EUPEH-15,20MYA-EU Special Wiring Anti Short Cycle Timer PEH-7MYA-EU Special Order LOW Ambient Cooling PEH-8,10MYA-EU Special Order LOW Ambient Cooling MF2 Fan motor outdoor52F1 Contactor fan I/D 52F2 Contactor fan O/D 52F4 CR1 Surge killer 21S4 Way valve 26D1 Thermostat defrost 26LPEH-15,20MYA-EU Special Order LOW Ambient Cooling 63H1,2 High-pressure switch 26L1,251F1~5 PE-7,8,10MYC-EU Electrical Operation Flow ChartsPEH-5MYA-EU, PEH-7,8,10MYA-EU PE-15MYC-EU PE-20MYC-EU PEH-15,20MYA-EU PE-7,8,10,15,20MYC-EU Refrigerant SchematicsPEH-5,7,8,10,15,20MYA-EU Safety & Control Devices PE-7,8,10MYC-EU PE-15,20MYC-EUPEH-7,8,10MYA-EU Special Order Service refYear Physical Data PE-7,8,1015,20MYC-EUIndoor AIR Circuit Enclosure and Frame PEH Series PEH-5MYA-EU PE-8MYA-EU JH527YE JH521YE 596X1415 PUH-10MYC1-EU PUH-10MYE-EU PUH-15MYC1-EU PUH-20MYC1-EU Space required around unit Indoor unit InstallationOutdoor unit Ceiling Over Service-panelOver 500 PU-15 At a single installation Over Service PanelOver Service-panel Preparation before installing Indoor unitOver Service-panel 500 Installation of the unit Indoor unit Outdoor unitNut Washer Nut M10 WasherDuct construction Lifting methodPiping connection Case of Brazing typeValve knob Pipe assyThrow away Fig By-pass tube Flange assy Extension pipe Extension pipe Use the attached new packing FigGood example Bad example Evacuation Airtight testAdditional refrigerant charge Drain piping Arrangement such as terminal block in control box Electric wiringControl module of outdoor unit PUH-5, 8 Terminal block for connection wires Power supply wiresControl module of outdoor unit PUH-7, 8 Control module of outdoor unit PU-20Method for connecting electric wire Protection switch 50A60A Selection of other capacities should beBefore starting the Trial run Putting condition of the belt=4.5mm Flexion loadW 1.4 2.2kg Instructions for USE Check points for operationOutlet grille Ceiling Ceiling Obstacle blocking air outletMaintenance Fingermarks Neutral GreaseAdhesive Isopropyl Paste AlcoholWhen beginning to use air conditioner again When the air conditioner is not to be used for a long timeTransfer of installation Transferring work, and constructionPlace for installation Maintenance and inspectionRegarding electric work Conseration of the noiseTrouble shooting At cooling, water which places to cooling pipingHOW to Operate Option PAC-204RC Display sectionBefore starting operation On / OFF Start an operationSelecting operation When selecting operation Room temperature adjustment To change room temperatureFor fan For coolingTime setting Days timer keyTimer Hold/Resume key Clock keyTrouble shooting Error DisplaySpecification Guidelines Outdoor UnitMemo Mitsubishi Electric Corporation Data Book PE,PEH