IMAC Team 2 - Improved Efficiency Final Report December 2006

Appendix C: Table of Variables for Bench Test Page 1 of 4

Appendix IMAC2 - C: Table of Variables for Bench Testing

AFR_scfm_indoor Total volumetric air flow rate, indoor

AFR_scfm_outdoor Total volumetric air flow rate, outdoor

COP_indoor_air Coefficient of performance based on air balance, indoor chamber

COP_indoor_chamber Coefficient of performance based on chamber balance, indoor chamber

COP_indoor_avg Average value of COP_indoor_air and COP_indoor_chamber

COP_final Final system COP value for further use (plotting, analyzing and so on).

COP_final is equal to COP_indoor_avg except for

those tests where ErrIndoor_air is greater than 15% and

COP_final is equal to COP_indoor_air instead of COP_indoor_avg.

COP_indoor_ref Coefficient of performance based on refrigerant balance, indoor chamber

DPca Air pressure drop across condenser

DPcd Air pressure drop between condenser air inlet and nozzle air inlet, for barrier test

DPcn Air pressure drop across condenser nozzle

DPcr Refrig. pressure drop across condenser

DPea Air pressure drop across evaporator

DPen Air pressure drop across evaporator nozzle

DPer Refrigerant pressure drop across evaporator 

DPersl Refrigerant pressure drop across evaporator and suction line, DPersl=DPer+DPsl

Dslope Slope of condensate for evaporator, condensate rate

Dslope2 Slope of condensed steam from the steam pipe inside the indoor duct

DT_desup_cp_out Superheat compressor outlet

DT_sub Subcooling condenser out

DT_sup Superheat evap out

DT_sup_cp_in Superheat compressor inlet

DPshr Refrigerant pressure drop at suction line heat exchanger (SLHX) low side

DPshr2 Refrigerant pressure drop at suction line heat exchanger (SLHX) high side

epsilon_ihx Efficiency of internal heat exchanger (or suction line heat exchanger, SLHX)

ErrIndoor_air Percent difference between indoor air and indoor chamber energy balances

ErrIndoor_ref Percent difference between indoor refrigerant and indoor chamber energy balances

ErrIndoor_air_avg Percent difference between indoor air and indoor average energy balances

ErrIndoor_ch_avg Percent difference between indoor chamber and indoor average energy balances

ErrIndoor_ref_avg Percent difference between indoor refrigerant and indoor average energy balances

ErrOutdoor_air Percent difference between outdoor air and outdoor chamber energy balances

ErrOutdoor_ref Percent difference between outdoor refrig and outdoor chamber energy balances

ErrOutdoor_air_avg Percent difference between outdoor air and outdoor average energy balances

ErrOutdoor_ch_avg Percent difference between outdoor chamber and outdoor average energy balances

ErrOutdoor_ref_avg Percent difference between outdoor refrig and outdoor average energy balances

eta_comp Compression efficiency of compressor

eta_isen Isentropic efficiency of compressor (for baseline R134a using eta_c)

eta_mech Mechanical efficiency of compressor

eta_v Volumetric efficiency

Fc Torque of compressor shaft

hcai Moist air enthalpy at condenser inlet

hcan Moist air enthalpy at condenser nozzle
IMAC Team 2 - Improved Efficiency Final Report December 2006

Appendix C: Table of Variables for Bench Test Page 2 of 4

hcri Refrigerant enthalpy at condenser inlet

hcro Refrigerant enthalpy at condenser outlet

heai Air enthalpy at evaporator inlet

heai_dry Dry air enthalpy at evaporator inlet

hean Air enthalpy at evaporator nozzle

hean_dry Dry air enthalpy at evaporator nozzle

heri Refrigerant enthalpy at evaporator inlet

hero Refrigerant enthalpy at evaporator outlet

hvin Water vapor inlet enthalpy

hvout Water vapor nozzle enthalpy

h_compin Refrigerant enthalpy at compressor inlet

h_compout Refrigerant enthalpy at compressor outlet

h_fg Latent heat of vaporization

h_liq_in Saturated liquid enthalpy at inlet state

h_liq_out Saturated liquid enthalpy at outlet state

h_vap_in Saturated vapor enthalpy at inlet state

h_vap_out Saturated vapor enthalpy at outlet state

Ma_indoor_dry Dry mass flow rate across evaporator

Ma_indoor_wet Wet mass flow rate across evaporator

Ma_outdoor_dry Dry air mass flow rate across condenser

Ma_outdoor_wet Wet air mass flow rate across condenser

Mr Refrigerant mass flow rate measured in liquid line

Mw_kgps Condensate rate

Mw_kgps2 Condensate rate from the steam pipe inside the indoor duct

Patm Atmospheric pressure

Pcc Refrigerant pressure at compressor crankcase, not measured for every system

Pcn Air pressure at condenser nozzles

Pcri Refrigerant pressure at condenser inlet

Pcro Refrigerant pressure at condenser out

Pen Air pressure at nozzle entrance

Peri Refrigerant pressure at evaporator inlet 

Pero Refrigerant pressure at evaporator out

Prcpi Refrigerant pressure at compressor inlet

Prcpo Refrigerant pressure at compressor out

P_ratio Compression ratio = Prcpo/Prcpi 

Pshri Pressure of refrigerant at SLHX inlet at low side

Pshri2 Pressure of refrigerant at SLHX inlet at high side

Pshro Pressure of refrigerant at SLHX outlet at low side

Pshro2 Pressure of refrigerant at SLHX outlet at high side

Pxri Refrigerant pressure at inlet to expansion device

Qindoor_air Evaporator cooling capacity based on indoor air side energy balance

Qindoor_chamber Evaporator cooling capacity based on indoor chamber side energy balance

Qindoor_avg Average value of Qindoor_air and Qindoor_chamber

Qindoor_final Final evaporator cooloing capacity value for further use

Qindoor_final is equal to Qindoor_avg except for

those where ErrIndoor_air is greater than 15% and Qindoor_final 

is equal to Qindoor_air instead of Qindoor_avg.
IMAC Team 2 - Improved Efficiency Final Report December 2006

Appendix C: Table of Variables for Bench Test Page 3 of 4

Qindoor_ref Evaporator cooling capacity based on indoor refrigerant side energy balance

Qoutdoor_air Condenser capacity based on outdoor air side energy balance

Qoutdoor_chamber Condenser capacity based on outdoor chamber side energy balance

Qoutdoor_avg Average value of Qoutdoor_air and Qoutdoor_chamber

Qoutdoor_final Final condenser capacity value for further use (plotting, analyzing and so on)

Qoutdoor_ref Condenser capacity based on outdoor refrigerant side energy balance

Q_ihx_high SLHX (or IHX) high side heat load

Q_ihx_max SLHX (or IHX) maximum possible heat load for efficiency calculation

Q_ihx_suc SLHX (or IHX) suction side heat load

Rhci Relative humidity at condenser inlet

Rhei Relative humidity at evaporator inlet

Rhen Relative humidity after nozzle in evaporator

Tcai Air inlet temperature at condenser

Tcao Air outlet temperature at condenser

Tcic Temperature condenser chamber inside ceiling

Tcif Temperature condenser chamber inside floor

Tciw Temperature condenser chamber inside wall

Tcn Average nozzle temperature in condenser

Tcn1 Air temperature at gas cooler/condenser nozzle 1

Tcn2 Air temperature at gas cooler/condenser nozzle 2

Tcoc Temperature condenser chamber outside ceiling

Tcof Temperature condenser chamber outside floor

Tcow Temperature condenser chamber outside wall

Tcph Temperature of compressor housing (air)

Tcri Refrigerant inlet temperature at condenser

Tcro Refrigerant outlet temperature at condenser

Tdpei Dew point temperature at evaporator inlet

Tdpen Dew point temperature at evaporator nozzle

Teai Air temperature at evaporator inlet

Teao1 Average of the first row of the matrix

Teao11 Matrix indices (row, column)

Teao12 Matrix indices (row, column)

Teao13 Matrix indices (row, column)

Teao14 Matrix indices (row, column)

Teao2 Average of the second row of the matrix

Teao21 Matrix indices (row, column)

Teao22 Matrix indices (row, column)

Teao23 Matrix indices (row, column)

Teao24 Matrix indices (row, column)

Teao3 Average of the third row of the matrix

Teao31 Matrix indices (row, column)

Teao32 Matrix indices (row, column)

Teao33 Matrix indices (row, column)

Teao34 Matrix indices (row, column)

Teao4 Average of the fourth row of the matrix

Teao41 Matrix indices (row, column)

Teao42 Matrix indices (row, column)
IMAC Team 2 - Improved Efficiency Final Report December 2006

Appendix C: Table of Variables for Bench Test Page 4 of 4

Teao43 Matrix indices (row, column)

Teao44 Matrix indices (row, column)

Teao_avg Average temperature of evap air out thermal couple grid (Matrix)

Teic Temperature evaporator chamber inside ceiling 

Teif Temperature evaporator chamber inside floor 

Teiw Temperature evaporator chamber inside wall 

Ten Average nozzle temperature 

Ten=(Ten1+Ten2)/2 when two evaporator nozzles are used for high load tests.

Ten=Ten2 when only nozzle no.2 is used for low load tests.

Ten1 Temp of evaporator air nozzle 1 

Ten2 Temp of evaporator air nozzle 2 

Teoc Temperature evaporator chamber outside ceiling 

Teof Temperature evaporator chamber outside floor 

Teow Temperature evaporator chamber outside wall 

Teri Temp of refrig at evaporator inlet 

Tero Temp of refrig at evaporator outlet 

Tgi Outdoor glycol temp in 

Tgi2 Indoor glycol temp in 

Tgo Outdoor glycol temp out 

Tgo2 Indoor glycol temp out 

Trcpi Temp of refrig at compressor inlet 

Trcpo Temp of refrig at compressor outlet 

Ts Temperature of steam entering indoor chamber 

Tw Temperature of condensate (out of evaporator) 

T_cond Condensing temperature 

T_evap_in Evaporating temperature at inlet state 

T_evap_out Evaporating temperature at outlet state 

Tshri Temperature of refrigerant at SLHX inlet at low side 

Tshri2 Temperature of refrigerant at SLHX inlet at high side 

Tshro Temperature of refrigerant at SLHX outlet at low side 

Tshro2 Temperature of refrigerant at SLHX outlet at high side 

Txri Temperature before the expansion device

Vc Compressor speed

Vn_c1 Specific volume at condenser nozzle 1

Vn_c2 Specific volume at condenser nozzle 2 

Vn_e1 Specific volume at evaporator nozzle 1 

Vn_e2 Specific volume at evaporator nozzle 2 

Wc Power for 1st blower plus heaters - condenser (outdoor) chamber

Wc2 Power for 2nd blower - condenser (outdoor) chamber

Wci Humidity ratio at condenser inlet

We Power for blower and heater - evaporator (indoor) chamber

Wei Evaporator inlet humidity ratio

Wen Humidity ratio after evaporator nozzles

W_comp Compressor power

Xoil Oil circulation rate

x_in Evaporator refrigerant inlet quality