Environmental Project, 951 – Comparisons of Energy Consumption for Refrigeration in Supermarkets

Appendix F

Examples of result files

1 Introduction

Examples of results generated on the basis of the measured data are given below. Due to the fundamental differences in the construction of the systems, the result files are not entirely identical. But in pairs they are, i.e. e., ISO-1 and ISO-3 look alike, as do ISO-2 and ISO-4.

There are two types of files: The first one contains summed daily consumption/capacity for a month. The other one contains hourly values for a day.

The first part of the name of the file on monthly values is X_YYMM. The first part of the name of the file on daily values is X_YYMMDD where:

X: Specifies system (F: ISO-1, H: ISO, S: ISO-3 and V: ISO-4)
YY: Year (03 or 04)
MM: Month (January: 01, February: 02,.....,December:12)
DD: Day of the month (01,02,.....,31).

2 Monthly printouts. File type X_YYMMc.res

These files contain the calculated and measured energy consumption per day and differences between measured and calculated energy consumption.

ISO-1 and ISO-3:

wF:	kWh/day	Calculated daily energy consumption by freezing compressors
wC:	kWh/day	Calculated daily energy consumption by cooling compressors
wP:	kWh/day	Measured daily energy consumption by the circulation pumps
wTot:	kWh/day	Calculated daily energy consumption by freezing and cooling compressors and circulation pumps
wTotm:	kWh/day	Measured total daily energy consumption.
DwTot:	%/kWh.	Difference between calculated and measured total daily energy consumption
WRefm:	kWh/day	Calculated daily energy consumption by freezing compressors in reference shop based on scaling of appliance/store data
wCrefm:	kWh/day	Calculated daily energy consumption by cooling compressors in reference shop based on scaling of appliance/store data
Totref:	kWh/day	Calculated total daily energy consumption in reference shop based on scaling of appliance/store data

ISO-2 and ISO-4:

wCm:	kWh/day	Measured daily energy consumption by cooling compressors incl. anti-sweat heaters, electric defrosting, and ventilators
wC:	kWh/day	Calculated daily energy consumption by cooling compressors
DwC:	%/kWh	Difference between calculated and measured daily energy consumption by cooling compressors without correction for anti-sweat heaters eTc.
wFm:	kWh/day	Measured daily energy consumption by freezing compressors incl. anti-sweat heaters, electric defrosting, and ventilators
wF:	kWh/day	Calculated daily energy consumption by freezing compressors
DwF:	%/kWh	Difference between calculated and measured daily energy consumption by freezing compressors without correction for anti-sweat heaters eTc.
wCm+wFm:	kWh/day	Measured total daily energy consumption by refrigeration systems incl. anti-sweat heaters eTc.
DwTot:	kWh/day	Difference between calculated and measured total daily energy consumption by compressors without correction for anti-sweat heaters eTc.
DwTot:	%	Difference between calculated and measured total daily energy consumption by compressors with correction for anti-sweat heaters eTc. Only ISO-2.( Anti-sweat heater eTc. 297 kWh/day)

3 Daily printouts. File type X_AAMMDDc.res

These files contain hourly means of evaporation and condensation temperatures, pressure ratios, volumetric and isentropic efficiencies, and power consumptions for freezing and cooling.

The printouts is the same for all four systems.

T0C:	C	Evaporation temperature for cooling
TcC:	C	Condensation temperature for cooling
PratioC :	-	Pressure ratio for cooling compressors
EtavC:	-	Volumetric efficiency for cooling compressors
EtaisC:	-	Isentropic efficiency for cooling compressors
qC:	kW	Refrigeration capacity for cooling
wC:	kW	Power consumption by cooling compressors
T0F:	C	Evaporation temperature for freezing
TcF:	C	Condensation temperature for freezing
PratioF:	-	Pressure ratio for freezing compressors
EtavF:	-	Volumetric efficiency for freezing compressors
EtaisF:	-	Isentropic efficiency for freezing compressors
qF:	kW	Refrigeration capacity for freezing
wF:	kW	Power consumption by freezing

4 Daily printouts. File type X_AAMMDDfugt.res

These files contain evaporation and condensation temperatures, relative refrigeration outputs COP, Carnot efficiencies for cooling and freezing, inside and outside temperatures, and humidity in shop.

The files for the four systems are almost identical, but those for ISO-1 and ISO-3 and not ISO-2 and ISO-4 contain COP and Carnot efficiency for freezing total, i.e., including the output from the cooling section. This corresponds to having a cascade system for freezing only.

Time:	H	Hours from the start of the day
T0F:	C	Evaporation temperature for freezing
TcF:	C	Condensation temperature for freezing
qF/qFm	-	Relationship between the actual and the maximum refrigeration capacity for freezing during the measuring period
COPF:	-	COP for freezing (The relationship between the refrigeration capacity and the power consumption by the compressor)
etaF:	-	Carnot efficiency for freezing - the relationship between COP and Carnot COP
COPFt	-	COP for freezing as cascade system -. only ISO-1 and ISO-3.
etaFt	-	Carnot efficiency for freezing as cascade system
T0C:	C	Evaporation temperature for cooling
TcC:	C	Condensation temperature for cooling
qC/qCm	-	The relationship between the actual and the maximum refrigeration capacity for cooling in the measuring period
COPC:	-	COP for cooling
etaC:	-	Carnot efficiency for cooling
Tinside:	C	Temperature inside shop
Toutside:	C	Temperature outside shop
Humidity:	%	Relative humidity inside shop

5 Daily printouts. File type X_AAMMDDrbutik.res

These files contain standardised refrigeration outputs and outputs and total power consumptions for reference shops based on scaling of appliance/store data

Time	H	Hours from the start of the day
QC/qCnom	-	The relationship between the momentary refrigeration capacity and the standardised refrigeration capacity for cooling
QF/qFnom	-	The relationship between the momentary refrigeration capacity and the standardised refrigeration capacity for freezing
qCrefb_	kW	Calculated capacity for cooling for reference shop based on scaling
qFrefb	kW	Calculated capacity for freezing for reference shop based on scaling
wTotrefb	kW	Calculated total power consumption for reference shop based on scaling