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GB/T 41660-2022 English PDF (GBT41660-2022)

GB/T 41660-2022 English PDF (GBT41660-2022)

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GB/T 41660-2022: The survey-evaluating method of energy utilization for refrigeration test systems

This document specifies the survey items, survey requirements, survey methods and evaluation of survey results for the survey-evaluating of energy-utilizing condition of refrigeration test system. This document is applicable to the evaluation of energy utilization survey for refrigeration test systems.
GB/T 41660-2022
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 27.200
CCS J 73
The survey-evaluating method of energy utilization for
refrigeration test systems
ISSUED ON: JULY 11, 2022
IMPLEMENTED ON: FEBRUARY 01, 2023
Issued by: Status Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 5
4 Survey items ... 5
5 Survey requirements and survey methods ... 7
6 Evaluation of survey results ... 16
Annex A (informative) Survey report for energy utilization of refrigeration test system ... 18
The survey-evaluating method of energy utilization for
refrigeration test systems
1 Scope
This document specifies the survey items, survey requirements, survey methods and evaluation of survey results for the survey-evaluating of energy-utilizing condition of refrigeration test system.
This document is applicable to the evaluation of energy utilization survey for refrigeration test systems.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 2589, General rules for calculation of the comprehensive energy consumption GB/T 6422, Testing guide for energy consumption of equipment
GB/T 7941, Refrigeration test system
GB/T 10870, The methods of performance test for water chilling (heat pump) packages using the vapour compression cycle
GB 17167, General principle for equipping and managing of the measuring instrument of energy in organization of energy using
GB/T 17758, Unitary air conditioners
GB/T 18430.1, Water chilling (heat pump) packages using the vapor compression cycle - Part 1: Water chilling (heat pump) packages for industrial and commercial and similar application
GB/T 18430.2, Water chilling (heat pump) packages using the vapor compression cycle - Part 2: Water chilling (heat pump) packages for household and similar application
JB/T 7249, Refrigeration and air-conditioning equipment Terminology
a) The design scheme of the test system shall be formulated with the goal of reducing system energy consumption and economical rationality, so as to achieve optimal operation.
b) The test environment, refrigeration system, water system, ventilation system, electrical system and other sub-systems (if any) and equipment of the test system shall be installed in good condition and comply with the provisions of GB/T 7941. c) High-efficiency and energy-saving products shall be given priority to the energy- consuming equipment of the test system. Realize the optimal combination. Ensure the rationalization of the energy consumption of the test system. Energy- consuming equipment announced by the status to be phased out shall not be used. d) The test system shall have complete technical files such as equipment ledger, operation record, maintenance and transformation record, etc. The storage time shall not be less than ten years.
e) The test system after modification and overhaul shall be inspected according to GB/T 7941 and passed the acceptance check. There are corresponding acceptance documents.
f) The supporting energy-saving facilities, energy-saving technology and energy online monitoring system of the test system shall be put into use.
4.1.2 The inspection of energy management status shall include the following: a) The measurement and monitoring instruments of the test system shall be fully equipped. The meter shall be within the validity period of the verification. b) The enterprise shall have a complete energy-saving operation management procedure for the test system to ensure that the test system can operate economically.
c) The operators of the test system shall pass the energy-saving operation training. They shall master the basic energy-saving operation skills before taking up the post.
4.2 Survey test items
The energy-utilizing condition survey test items of the test system shall include the following contents:
a) Temperature between the test environment on the indoor (outside) side of the test system and the inlet air status of the tested unit (if any);
b) Condition adjustment temperature change rate (if any) on the air side of the test environment room on the indoor (outside) side of the test system;
c) Inlet (outlet) water temperature and flow rate (if any) of the tested unit?€?s use (heat source) side;
d) Condition adjustment temperature change rate (if any) on the water side of the tested unit?€?s use (heat source) side;
e) Consumed power of the test system;
f) Cooling (heating) consumed power of the tested unit;
g) Refrigeration (heat) capacity of the tested unit;
h) Refrigeration (heat) energy consumption coefficient of the test system. 5 Survey requirements and survey methods
5.1 Basic requirements for survey
5.1.1 The survey of energy-utilizing condition shall be carried out under the normal operation status of the test system. The survey process shall select the tested upper limit unit and the tested lower limit unit for testing:
a) Tested upper limit unit: Units whose nominal cooling (heating) capacity is more than 75% of the test range of the maximum cooling (heating) capacity designed for the test system;
b) Tested lower limit unit: Units whose nominal cooling (heating) capacity is less than 150% of the test range of the minimum cooling (heating) capacity designed for the test system.
5.1.2 The survey shall be carried out under the condition that the dry bulb temperature of the outdoor atmosphere is 20??C~30??C and the wet bulb temperature is less than 26??C. The wind speed of the outdoor air shall be less than 3 m/s when measuring. Temperature sensors shall be protected against moisture and radiation.
5.1.3 The energy-utilizing survey cycle of the test system shall consist of two phases: a) Survey cycle for test condition adjustment stage: It starts from the start-up of the test system and ends when the operating condition reaches the stable operation status of test.
b) Survey cycle for stable operation stage of test: Carry out after the test system and the tested unit reach the stable operation status of test for 1 h. A survey cycle shall not be less than 2 h (if the tested air-cooled unit has an unsteady heating test condition, the data acquisition phase of the survey cycle for testing the stable operating status shall be extended to 3 h, or the heat pump unit completes 3 defrosting cycles, whichever is shorter).
5.4.4 Test of temperature change rate of condition adjustment at the water side 5.4.4.1 The test of temperature change rate of condition adjustment at the water side shall be carried out during the test condition adjustment stage.
5.4.4.2 During the entire survey period, survey the temperature of the inlet (outlet) water on the use (heat source) side of the tested unit according to the test method specified in 5.4.3. Record the initial temperature T0,w at the start-up of the test system. Then record the inlet (outlet) water temperature Tp,w on the use (heat source) side of the tested unit according to 5.1.4, until the test system reaches the stable operation status of test. At this time, the temperature Tp,w of the inlet (outlet) water on the use (heat source) side of the tested unit reaches the temperature value Tt,w in the stable operation status of test.
5.4.5 Consumed power test of the test system
5.4.5.1 The consumed power test shall be carried out under the stable running status of the test system.
5.4.5.2 The sum of the measured consumed power of each energy-consuming equipment required by the normal operation of the refrigeration system, water system, ventilation system, electric control system, lighting, etc. of the test system is regarded as the actual consumed power of the test system.
5.4.5.3 The test system installed with sub-item energy meters can directly record the total consumed power in the survey period. For the test system without sub-item metering watt-hour meter, the total consumed power of the test process and the total consumed power of the tested unit shall be tested respectively during the survey period. The total consumed power during the test shall be tested at the entrance of the main circuit breaker. The total consumed power of the tested unit shall be conducted at its power supply circuit breaker or contactor.
5.4.5.4 If the test system shares sub-systems such as cooling water and compressed air with other devices, the energy consumption of the sub-system energy-consuming equipment included in the test system shall be allocated according to 5.5.3.3. 5.4.5.5 If the test system and the tested unit consume non-electric energy such as coal, natural gas, heat, etc., the above-mentioned energy consumption shall be converted into electric energy consumption according to 5.5.3.4. The configuration, management and testing of non-electric energy consumption measuring instruments shall comply with the provisions of GB 17167 and GB/T 6422.
5.4.5.6 If the test system and the tested unit consume renewable energy such as wind power and solar energy or electric energy generated by renewable energy, the energy consumption shall be deducted according to the usage ratio.
5.4.6 Test of the cooling (heat) capacity and consumed power of the tested unit 5.4.6.1 The test of cooling (heat) capacity and consumed power of the test system of air-conditioning equipment shall comply with the provisions of GB/T 17758. 5.4.6.2 The cooling (heat) capacity and consumed power test of the chilled water (heat pump) unit shall be in accordance with the provisions of GB/T 18430.1 or GB/T 18430.2.
5.4.6.3 The cooling (heat) capacity and consumed power of other types of tested units shall be tested in accordance with the provisions of their corresponding product standards.
5.5 Calculation methods for survey items
5.5.1 Calculation of temperature change rate for air side condition adjustment between test environments
According to the test methods in 5.4.1 and 5.4.2, record the air dry bulb temperature data between the test environments and draw the temperature change curve between the environments (as shown in Figure 2). According to formula (1), determine the temperature change rate RT,r of the air side condition between the test environments. Where,
RT, r - the temperature change rate of the air side condition adjustment between the test environments, in Celsius per hour (??C/h);
??Tp,r - the change value of air dry bulb temperature between test environments within the time interval ??t, in Celsius (??C);
??t - Time interval, in hours (h).
5.5.2 Calculation of temperature change rate for water side condition adjustment According to the test methods in 5.4.3 and 5.4.4, record the temperature data of the water inlet (outlet) on the use (heat source) side of the tested unit and draw the temperature change curve (as shown in Figure 2). The temperature change rate RT,w can be determined according to the formula (2).
Where,
t - Survey cycle, in hours (h).
5.5.3.2 The consumed power in the survey cycle of the test system without energy sub- item metering shall be calculated according to formula (4).
Where,
EA - Total consumed power of the test process in the survey cycle, in kilowatt-hour (kW???h);
EU -Total consumed power of the tested unit during the survey cycle, in kilowatt-hour (kW???h).
5.5.3.3 If the test system shares sub-systems such as cooling water and compressed air with other devices, the energy consumption of the energy-consuming equipment is distributed proportionally according to formula (5) according to the characteristic parameters of the sub-system supplied to the test system.
Where,
Ej,d - Energy consumption of sub-system j included in the total energy consumption of the test system, in kilowatt-hour (kW???h);
Qj - Total amount of characteristic parameters provided by sub-system j, for example, for the cooling water system, the characteristic parameter is the total flow of cooling water;
l - Number of energy-consuming equipment in the sub-system j;
ek - Total consumed power of the kth energy-consuming equipment in the sub-system j in the survey cycle, in kilowatt-hour (kW???h);
Qj,d - Characteristic parameter of the test system supplied by the sub-system j. 5.5.3.4 If the test system consumes non-electric energy such as coal, natural gas, heat, etc., convert the above-mentioned energy consumption into electric energy consumption according to formula (6).
Where,
Ei,e - Electric energy consumption that is converted by the i-th energy actually consumed by the test system, in kilowatt-hour (kW???h);
Ei - Amount of the i-th energy actually consumed by the test system;
ki - Standard coal conversion coefficient of the i-th energy;
ke - Conversion coefficient of electric power (equivalent value) to standard coal, selected according to the provisions of GB/T 2589, in kilogram standard coal per kilowatt-hour [kgce/(kW???h)].
5.5.4 Energy consumption coefficient of the test system
5.5.4.1 The energy consumption coefficient of the test system under refrigeration conditions is calculated according to formula (7).
Where,
??C - Energy consumption coefficient of the test system under refrigeration condition, in kilowatt per kilowatt (kW/kW);
PTS,C - Consumed power during the survey cycle during the refrigeration test, in kilowatts (kW);
QC - During the refrigeration test, the measured cooling capacity of the tested unit, in kilowatts (kW).
5.5.4.2 The energy consumption coefficient of the heating condition of the test system is calculated according to formula (8).
Where,
??H - Energy consumption coefficient of the heating condition of the test system, in kilowatt per kilowatt (kW/kW);

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