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

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)
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)bzxz.net
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
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