### IMAC Team 2

- Improved Efficiency Final Report December 2006

Appen dix C: Table of Variables for Bench Test Page 1 of 4 

## Ap **pendix IM**  **AC 2** 

**- C**  **: Table of Variables for Bench T** **esting**

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 equ al 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 sucti on 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 ind oor 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 bala nces 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

Appen dix C: Table of Variables for Bench Test Page 2 of 4 hcri Refrigerant enthalpy at condenser inlet hcro Refri gerant 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 m ass 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 Atm ospheric 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 compress or 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 Qi ndoor_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

Appen dix 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 o utdoor 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 humi dity at evaporator inlet Rhen Relative humidity after nozzle in evaporator Tcai Air inlet temperature at condenser Tcao Air outlet temperature at condenser Tcic Te mperature condenser chamber inside ceiling Tcif Te mperature condenser chamber inside flo or Tciw Te mperature 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 Te mperature condenser chamber outside ceilin g Tcof Te mperature condenser chamber outside floor Tcow Te mperature condenser chamber outside wall Tcph Te mperature 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) Teao 13 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

Appen dix 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 Te mperature evaporator chamber ins ide ceiling Teif Te mperature evaporator chamber inside floor Teiw Te mperature 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 n o.2 is used for low load tests. Ten1 Te mpof evaporator air nozzle 1 Ten2 Te mpof evaporator air nozzle 2 Teoc Te mperature evaporator chamber outside ceiling Teof Te mperature evaporator chamber outside floor Teow Te mperature evaporator chamber outside wall Teri Te mpof refrig at evaporator inlet Tero Te mpof 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 Te mpof refrig at compressor inlet Trcpo Te mpof refrig at compressor outlet Ts Te mperature of steam entering indoor chamber Tw Te mperature of condensate (out of evaporator) T_cond Condensing temperature T_evap_in Evaporating temperature at inlet state T_evap_out Evaporating tem perature at outlet state Tshri Te mperature of refrigerant at SLHX inlet at low side Tshri2 Te mperature of refrigerant at SLHX inlet at high side Tshro Te mperature of refrigerant at SLHX outlet at low side Tshro2 Te mperature of refrigerant at SLHX o utlet at high side Txri Te mperature 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 evapo rator 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 We i Evaporator inlet humidity ratio We n Humidity ratio after evaporator nozzles W_com p Compressor power Xoil Oil circulation rate x_in Evaporator refrigerant inlet quality