Evaluation of Pump and Air Pumps
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1 D4.2. / D 3.4. Concept for evaluation of Version 2.0 A defined methodology for calculation of the seasonal performance factor and a definition which devices of the system have to be included in this calculation: Air to air pumps Date of delivery: Contract No.: I/08/776/SI Authors: Philippe Riviere, Armines Michel Coevoet, df Cong-Toan Tran Co-Authors Andreas Zottl, AIT Roger Nordman, SP The sole responsibility for the content of this document lies with the authors. It does not necessarily reflect the opinion of the uropean Communities. The uropean Commission is not responsible for any use that may be made of the information contained therein. page 1 of 13 Version 1.0
2 Content FORWORD... 3 NOMNCLATUR... 3 SASONAL PRFORMANC FACTOR () VALUATION... 4 SYSTM BOUNDARY DSCRIPTION... 4 SYSTM BOUNDARIS HATING MOD: calculation ing mode:... 5 SYSTM BOUNDARIS COOLING MOD:... 7 calculation cooling mode:... 8 COMPARISON OF TH SYSTM- BOUNDARIS IN STANDARDS AND TH SYSTM BOUNDARIS OF TH -CALCULATION MTHODOLOGY LITRATUR page 2 of 13 Version 1.0
3 Foreword The aim of this document is to define the system boundaries for calculating the for ing and cooling of air to air pump systems, with non ducted external units, and internal units that can be ducted or non-ducted. Defining the system boundaries has direct impact on the necessary measurement equipment to measure the needed parameters for the calculation of the different. For this reason the document should be revised after the first measurement period to see if the defined system boundaries can be measured in the field or should be adapted. Nomenclature SH space ing [-] HP pump [-] CU Cooling unit [-] i Seasonal performance factor (Index: H for ing, C for cooling) [-] COP Coefficient of performance [-] R nergy efficiency ratio [-] SR Seasonal energy efficiency ratio [-] SCOP Seasonal coefficient of performance [-] For ing mode: Q H_hp quantity of of the HP in SH operation [kwh] Q H_bu quantity of of the back-up er for SH [kwh] S_fan electrical energy use of the HP source fans [kwh] B_fan electrical energy use of the sink (building) fans [kwh] H_hp electrical energy use of the HP for SH [kwh] H_bu energy use * of the back-up er for SH [kwh] * for additional ing other then electrical back up er the energy content of the fuel demand has to be taken into account For cooling mode: Q C produced cooling energy of the CU for cooling [kwh] S_fan electrical energy use of the CU sink fans [kwh] B_fan electrical energy use of the building fans [kwh] CU electrical energy use of the CU [kwh] page 3 of 13 Version 1.0
4 Seasonal Performance Factor () evaluation D4.2.- Concept for evaluation of describes a standard evaluation method for monitoring results to get data for quality characteristics for pump systems and technologies. This calculation method also provides the possibility to include the impact of fans on the performance of the pump system, which will be taken into account by the definition of different system boundaries. The methodology of calculating the makes it possible to compare the pump system with common ing systems like oil or gas. By this comparison it is also possible to calculate the CO 2 eq and primary energy reduction potential from different pump systems compared to other ing systems. This evaluation method is based on a harmonised monitoring methodology, also developed in the SPMO project, which allows disposing all necessary measurement data for applying the evaluation method presented in this document. System boundary description The definition of the system boundaries influences the results of the depending on the impact of the auxiliary drives. Therefore the should be calculated according to different system boundaries. This will reflect the impact of the different devices on the performance of the system. Due to the fact that the units can operate in ing or in cooling mode the system boundaries and the calculation methodology is separated for ing and cooling mode. According to the described system boundaries the can be calculated for cooling and space ing. There is no hot water domestic production considered for air to air pumps. For systems with an additional ing system other than an electrical back up er (e.g. oil, gas or biomass) the quantity of and the energy content of the fuel demand have to be determined for calculating H3 and H4. The energy content can be determined by measuring the fuel demand and multiplying with the calorific value of the fuel. For additional solar thermal systems the electric auxiliary energy to run the system has to be measured. With the energy delivered to the ing system by the additional ing the energy supply ratio of the pump system is calculated. Because air to air systems have different architectures than water based systems, a specific nomenclature has been developed. System boundaries ing mode: H1 : This system contains only the pump unit. H1 evaluates the performance of the refrigeration cycle i.e. it is computed based on the electric energy delivered to the pump minus its fans consumption. The system boundaries differ from the COP defined in N [1], since the standard takes, in addition, a part of (for ducted units) or the totality (non ducted units) of the sink fan consumption to overcome head losses, and the source fan consumption. page 4 of 13 Version 1.0
5 H2 : This system contains the pump unit and the equipment to make the source energy available for the pump. H2 takes into account, in addition to H1, total source fan consumption, and the sink fan consumption only for non ducted internal units. Note: COP in N and SCOP NT in prn are similar to H2 for ducted unit (except only a part of the source fan is included in the standard definition for ducted units) and almost exactly the same as H2 for non ducted units, except that in SCOP NT the crankcase and standby consumption during compressor stop are not included (see table 1 at the end of the document).. H3 : This system contains the pump unit, including its fans (as for H2 ) plus the back up er. H3 represents the pump system and thereby it can be used for comparison to conventional ing systems (e.g. oil, gas, ). This system boundary is similar to the in VDI [4], N [5]. For non ducted air to air pumps, H3 is comparable to the SCOP in prn For ducted air to air units, the sink fan consumption to circulate the air in the duct network is excluded. (see table 1 at the end of the document) H4 : This system contains the pump unit, the equipment to make the source energy available, the back up er and all auxiliary drives including the auxiliary of the sink system. H4 represents the pump ing system including all auxiliary drives which are installed in the ing system. H4 is equal to H3 for non ducted unit (see table 1 at the end of the document) H4 H3 H2 Fan pump hot water tank space ig buffer tank Duct (if ducted unit) H1 Fan Figure 1: xample scheme for a ing system -calculation ing mode: In this chapter the formulas for calculating the for ing mode together with the energy flowcharts for the different system boundaries are described. page 5 of 13 Version 1.0
6 source H 4 fan or pump pump Back - up er Building fan Q Q H _ bu S _ fan H _ bu B _ fan Figure 2: energy flow chart for the ing mode H 1 Q H1 Q source pump H 2 Q S _ fan/ pump source H 2 fan pump Q S _ fan H 3 Q S _ fan/ pump Q H _ bu H _ bu source H 3 fan or pump pump Q Back - up er Q H _ bu S _ fan H _ bu page 6 of 13 Version 1.0
7 H 4 S _ fan Q Q H _ bu H _ bu B _ fan source H 4 fan pump Back - up er Building fan Q Q H _ bu S _ fan H _ bu B _ fan System boundaries cooling mode: C1 : This system contains only the cooling unit. C1 evaluate the performance of the refrigeration cycle i.e. it is computed based on the electric energy delivered to the cooling unit minus its fans consumption. The system boundaries are similar to R defined in N [1], except that the standard takes, in addition, a part of (for ducted units) or the totality (non ducted units) of the sink fan consumption to overcome head losses, and the source fan consumption (see table 1 at the end of the document). C2 : This system contains the cooling unit and the equipment to dissipate the energy. c2 takes into account, in addition to c1, total source fan consumption, and the sink fan consumption only for non ducted internal units The system boundaries SR ON in prn [2]. Note: R in N and SR NT in prn are similar to C2 for ducted unit (except only a part of the source fan is included for ducted units) and almost exactly the same as C2 for non ducted units, except that in SR NT the crankcase and standby consumption during compressor stop are not included (see table 1 at the end of the document). C3 : This system contains the cooling unit, the equipment to dissipate the energy and all auxiliary drives of the cooling system. C3 represents the cooling system including all auxiliary drives which are installed in the cooling system. For non ducted air/air units, C3 is exactly the same as C2 (see table 1 at the end of the document) page 7 of 13 Version 1.0
8 C3 C2 C1 cooling unit space cooling buffer Figure 3: xample scheme for a cooling system calculation cooling mode: In this chapter the formulas for calculating the for cooling mode together with the energy flowcharts for the different system boundaries are described. Figure 4: energy flow chart for the cooling mode C1 C1 Q C CU sink cooling unit Q C CU page 8 of 13 Version 1.0
9 C2 S _ fan QC CU sink C 2 fan cooling unit Q C S _ fan CU C3 S _ fan Q C CU B _ fan sink C 3 fan cooling unit Building fan Q C S _ fan CU B _ fan page 9 of 13 Version 1.0
10 Comparison of the system- boundaries in standards and the system boundaries of the -calculation methodology There are different existing standards and regulations for calculating the. These calculation methodologies are mainly based on input from the testing standard N The system boundaries of testing standards are however focused on the ing or cooling unit itself. For comparing test results of the units with other units, the system integration is not taken into account. Therefore these standards do not include the entire energy consumption of the auxiliary drives on the sink and source side. The following descriptions show the differences between the system boundaries for field measurements and testing standards. The aim is to point out the difference between field testing and testing on a test rig, which does not necessarily means that there should be no differences as this is not possible for practicable measurement systems in the field. The main difference of the evaluation methodologies is that testing is focused on the unit and the field measurements are focused on the system. For field measurements measuring the proportional energy input on the sink and source side requires high efforts for the measurement equipment and cannot be realized within the common field measurement methodology. Hence the system boundaries for testing and field measurements will be slightly different, this has to be a taken into account when comparing calculated and measured. N 14511: This standard describes the testing procedure to calculate the COP or R. The average electrical power input of the unit within the defined interval of time is obtained from: the power input for operation of the compressor and any power input for defrosting; the power input for all control and safety devices of the unit and; the proportional power input of the conveying devices (e.g. fans) for ensuring the transport of the transfer media inside the unit. This equates to the system boundary of H1 / C1, with the difference being, that H1 / C1 does not include the proportional energy input of the auxiliary devices. N : This standard describes a calculation Bin method for energy consumption, starting from, among other, ing load evolution, ing curve of the pump, climate conditions and standard pump testing points. This method standardizes boundary contains the pump unit, the equipment to make the source energy available, internal and external boilers and back-up ers. This equates to boundary H4. The difference is that H4 in the standard N the thermal losses of the ing system are calculated (although N drawings are more adapted to hydronic space ing,) page 10 of 13 Version 1.0
11 Figure 5: system boundary N prn 14825: The calculation methodology and the measurement procedure of this standard are based on the standard N Therefore the auxiliary drives are mentioned partly in the SCOP calculation. SCOP NT is more or less similar to H2 and SCOP/SR to H3 / C2. Unlikely N , different running conditions are set, according climate (3 zones: cold, average, warm) and space ing emitters, what gives SCOP/SR for pump whose features are known at 6 tested conditions. uropean Directive 2009/125/C Lot 10: Calculation of energy consumption in Lot 10 is similar to prn The following table 1 gives an overview of the difference between the defined system boundaries for evaluating the measurement data and existing standards. page 11 of 13 Version 1.0
12 Component H1/C1 H2/C2 H3 N14511 N prn14825* Lot 10 Compressor x x x x x x x x Source fan --- x x x x x x x Back-up x x --- x x x Sink fan --- x ** x ** x * refers to SCOP and SR ** only for non-ducted internal unit system H4 head losses x head losses head losses Table 1: comparison of system boundaries page 12 of 13 Version 1.0
13 Literature [1] N 14511, Air conditioners, liquid chilling packages and pumps with electrically driven compressors for space ing and cooling, March 2008 [2] prn 14825, Air conditioners, liquid chilling packages and pumps, with electrically compressors, for space ing and cooling- Testing and rating at part load conditions and calculation of seasonal performance, November 2009 [3] RS Directive, DIRCTIV 2009/28/C OF TH UROPAN PARLIAMNT AND OF TH COUNCIL, April 2009 [4] N , Heating systems in buildings Method for calculation of system energy requirements and system efficiencies Part 4-2: Space ing generation systems, pump systems, September 2008 page 13 of 13 Version 1.0
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