title>JB/T 7666-1995 General provisions for nominal operating conditions of refrigeration and air-conditioning equipment - JB/T 7666-1995 - Chinese standardNet - bzxz.net
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JB/T 7666-1995 General provisions for nominal operating conditions of refrigeration and air-conditioning equipment
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Standard ID:
JB/T 7666-1995
Standard Name: General provisions for nominal operating conditions of refrigeration and air-conditioning equipment
This standard specifies the nominal operating conditions of positive displacement refrigeration compressors and units, chillers and air conditioners. This standard applies to the design, inspection, acceptance and other purposes of positive displacement refrigeration compressors and units, chillers and air conditioners. It is also applicable to the inspection and acceptance standards of import and export trade. JB/T 7666-1995 General provisions for nominal operating conditions of refrigeration and air conditioning equipment JB/T7666-1995 Standard download decompression password: www.bzxz.net
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Mechanical Industry Standard of the People's Republic of China Nominal operating conditions of refrigeration and air-conditioning equipment General provisions Subject content and scope of application JB/T7666-95 This standard specifies the nominal operating conditions of positive displacement refrigeration compressors and units, chillers and air conditioners (machines). This standard is applicable to the design, inspection, acceptance and other purposes of positive displacement refrigeration compressors and units, chillers and air conditioners (machines). It is also applicable to the inspection and acceptance standards of import and export trade. 2 Reference standards GB9237 General technical specifications for refrigeration equipment 3 Nominal operating conditions of positive displacement refrigeration compressors and units and compression condensing units 3.1 Nominal operating conditions of compressors and units and compression condensing units with refrigerants R12, R22 and R502 3.1.1 The nominal operating conditions of refrigeration compressors and units are shown in Table 1. Table 1 Operating condition number Evaporating temperature 23(-23.3) Condensing temperature Suction temperature Liquid temperature 44(48.9) Note: The operating conditions in brackets are for inspection and acceptance in import and export trade. The operating condition parameters in brackets are applicable to the operating conditions in brackets, the same below. 3.1.1.1 Condition (1A) must be indicated when using a suction temperature of 35℃. C Unit type All types (Fully enclosed) (Semi-enclosed) (Open type) All types Fully enclosed All types Fully enclosed (Semi-enclosed) (Open type) 3.1.1.2 The ambient temperature of conditions 1, 2, 3, 4, 6, 7, and 8 is (25 + 5)°C, conditions 5 and (5A) are 32°C, and other conditions with brackets are 35°C. 3.1.1.3 For conditions 8, 8 (A) and (8B), when the unit type is a single-unit two-stage unit, the intermediate temperature is the intermediate pressure saturation temperature plus 10°C. 3.1.2 The nominal operating conditions of heat pump compressors and units are shown in Table 2. Approved by the Ministry of Machinery Industry of the People's Republic of China on June 16, 1995, and implemented from July to January 1996 Air source type Water source type Low temperature 1 Low temperature! High temperature heating Low temperature heating Refrigeration and heating Operating condition serial number JB/T 7666--95 Evaporating temperature -1(-1. 1) The nominal operating conditions of refrigeration compression condensing units are shown in Table 3. Table 3 Condensing temperature Condenser cooling method Operating condition number Evaporating temperature - 7(—6. 7) Suction temperature Inlet dry bulb Other refrigerants listed in GB 9237 may refer to the provisions of the above operating conditions. Alternative refrigerants shall comply with the provisions of the above operating conditions. 3. 1.5 3.2 Nominal operating conditions of compressors and units and compression condensing units with refrigerant R717 Suction temperature 4(—3.9) Liquid temperature 38(35) Cooling Inlet wet bulb Ambient temperature Type of compressor and unit All types (Totally enclosed) (Semi-enclosed open) (Totally enclosed) (Semi-enclosed open) The nominal operating conditions of refrigeration compressors and units are shown in Table 4. Low temperature sub-category conditions: When the unit is a single-unit two-stage unit, the intermediate temperature of condition 3 is the intermediate pressure saturation temperature plus 5°C, and the liquid temperature of condition (3A) is the intermediate pressure saturation temperature plus 5.6°C. Table 4 Low temperature 1 Low temperature 1 Low temperature! Condition number Evaporation temperature - 23(—23. 3) Condensation temperature Refrigeration compression condensing unit nominal conditions are shown in Table 5. Table 5 Operating condition number Evaporating temperature Suction temperature Ambient temperature Suction temperature -1(—1.1) —9(--9. 4) -15(-17. 8) -20(— 34. 4) Liquid temperature 30(35) Cooling method of evacuator Ambient temperature Evaporative cooling Inlet wet bulb Nominal operating condition of chiller JB/T 7666—95 The nominal operating conditions of positive displacement and centrifugal chillers are shown in Table 6. Among them, the air-cooled heat pump type is only applicable to positive displacement chillers. The fouling coefficient of the water side of the unit is 0.0086m2, C/kW. Table 6 Using side Working condition number Cold and warm water Heat source side or heat release side 37(35)bZxz.net Note: When the air-cooled condenser in working condition 1 and (1A) does not use evaporative condensation water cooling, the wet bulb temperature is not specified. Nominal working condition of air conditioner The nominal working condition of unit air conditioner is shown in Table 7. Table? Indoor unit Constant temperature and humidity Working condition number (2B) 19.5(19.4) Note: ①The water flow rate of heat pump working condition is the same as that of cooling working condition. (6.1) Outdoor unit Evaporative cooling ② Refrigeration condition When the air-cooled condenser does not use evaporative condensation water cooling, the wet bulb temperature is not specified. The nominal operating conditions of room air conditioners are shown in Table 8. Indoor unit Operating condition number 21(20) The nominal operating conditions of the air conditioner dedicated to the computer room are shown in Table 9. Wet bulb Outdoor unit Evaporative cooling Yanfa condensing Inlet air wet bulb Water cooling Water cooling Inlet air temperature 22(22.2) 14.5(14.2) Heating 3 (3A) 15.5(15.5) JB/T 766695 Indoor unit Ambient temperature Water vapor Pressure (gauge) Saturation temperature Electric heating Water supply inlet temperature 22(22.2)14.5(14.2)18(13.8)105(104.4) degrees21(21.1) 100(103.3)120(121) Outdoor unit Evaporation cooling 19.5(19.4) [19.5(19.5) Water cooling Rated voltage Note: ① When the air-cooled condenser in refrigeration and humidification conditions does not use evaporative condensation water cooling, the wet bulb temperature is not specified. ③The mass concentration of ethylene glycol solution is 40%. Additional remarks: This standard is proposed by the Refrigeration Equipment Standardization Technical Committee of the Ministry of Machinery Industry. This standard is under the jurisdiction of the Hefei General Machinery Research Institute of the Ministry of Machinery Industry. This standard was drafted by the Hefei General Machinery Research Institute of the Ministry of Machinery Industry. The main drafters of this standard are Ren Jinlu and Zhang Mingsheng. 138 80(82.2)70(71.1) Ethylene glycol cooling Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.