IEC TS 62796-2013 pdf Energy efficiency in electroheating installations

3.2.4 efficiency, <of an electroheating installation> ratio of the usable enthalpy increase in the workload to the electric energy supplied to it at the location of the equipment, during a cycle of batch operation or stationary operation during a suitable time period for measurements [SOURCE: IEC 60050-841 :2004, 841 -22-70, modified – Enthalpy increase in the workload is specified instead of useful energy, and measurement time limits have been added.] 3.2.5 performance, <of an electroheating installation> degree to which the intended functions, including energy or power consumption and output as well as the result of the treatment of the workload are accomplished 3.2.6 end product quality degree to which a set of inherent characteristics of a processed workload fulfils requirements 3.2.7 power factor under periodic conditions, ratio of the absolute value of the active power P to the apparent power S Note 1 to entry: This is applied to the supply network under normal operation. [SOURCE: IEC/TS 62257-1 2-1 :2007 [2], 3.4, modified – Note 1 to entry has been added.] 3.2.8 cold start-up process by which the equipment is energised into hot standby operation from the cold state, including all other start-up operations which enable the equipment to run under normal operation Note 1 to entry: This mode of operation applies to cases where there is a significant energy consumption needed for obtaining a state of the equipment allowing the actual processing of the workload, see 6.1 .
7.2 Measurement of electric-only conversion efficiency The input electric power and power factor and the electric output power flow are measured and reported under normal operation with equal workload specification. The workload is then either a normal, a dummy or a performance test workload. All measurements of the electric energy consumption shall reflect specific consumption by defined parts of the installation during a defined time period or a specified operation. The following shall be reported, if applicable: a) The energy consumption of a batch type installation during one cycle; this may be measured and averaged over a defined number of cycles. The number of cycles and variation of energy consumption shall be recorded in the measurement report. b) The energy consumption of equipment for continuous operation during processing of a defined amount of workload. c) The energy consumption of the equipment over a complete production cycle – for example from morning to evening. If the final frequency conversion is by a standardised component, its manufacturer data may be used. Any ancillary electric power needed for energising a component or assembly for the final frequency conversion is included in the electric input from the supply network. The electric power consumption by any cooling devices is not included, neither of any other control circuit. If there is an external voltage transformation from the external network supplying the plant to a special voltage which is fed into the equipment, these transformation losses are not included. 7.3 Measurement of electroheating energy consumption and efficiency In addition to the specifications in Clause 5, the power consumption of the mechanical accessories needed for the operation and use of the electroheating equipment shall be considered separately. Any ancillary cooling or preheating equipment not being a part of the equipment under test is also considered as separate in Clause 8.