Weak current College】 【the air conditioning with cooling technology law questions and answers reference 15 --- Power By】 【China power house network.

<br> First, the alternative question: (25 min) <br> 1, power supply voltage changes do not affect the three-phase asynchronous motor torque. () <br> 2, salt water as refrigerant should make its crystallization temperature below .refrigerant evaporating temperature 6 ~ 80C. () <br> 3, when the fault analysis, maximizing description troubleshooting problems. () <br> 4. before the repair device, the device's casing must be ground fault protection and protection of the zero line .. () <br> 5, work monitoring system is to guarantee the personal safety of emergency operations the correct key measures, monitoring of the safety technology level and the operational staff of sibling. () <br> 6, screw compressors, centrifugal compressor .can realize stepless energy regulation. () <br> 7, when the cooling capacity is greater than 15KW, most efficient screw chiller. () <br> 8, medium-voltage pressure vessel design pressure is 1 .6 mpa. 10MPa P.. .() <br> 9, washing oil separator for ammonia refrigeration systems. () <br> 10, R22 in high condensing pressure of maximum pressure difference to Pk-Po ≤ 1.8MPa. (A) 11, pressure gauge, thermometer, solenoid .valve, control valve, safety valve, and so should periodically check the test, per-year inspection. () <br> 12, hot welding system leakage point, should strictly observe the safety regulations for welding. () <br> 13, .compressor motor windings and motor, winding interruption burning, winding road, earth leakage may use multimeter ohm stalls. () <br> 14, excessive engine is screw exhaust temperature or overheat. () <br> 15, piston and cylinder clearance is too .large, too much lubricant residues are back to the cause of rap in the cylinder. () <br> 16, screw compressor compression ratio is too large to cause body temperature is too high. () <br> 17, refrigeration system long- .term outage, the low pressure side and compressor pressure should be maintained to avoid 0.02MPa air into the system. () <br> 18, thermostatic expansion valve sensor shall preferably installed in the evaporator outlet clearance 1.5m above. () <br> .19, refrigeration system at run time, the suction pressure value that is evaporating temperature, so regular observation of inspiratory pressure. () <br> 20, thermistor semiconductor temperature controller is the use of the principle and the balance bridge work. () < .br> 21, LIBR absorption chiller of the molten Crystal tube prevents crystallization failure. () <br> 22, fan coil units of local regulation water regulation and has air conditioning in the second. () <br> 23, room air conditioner AC .frequency conversion motor is a three-phase AC synchronous motor. () <br> 24, can measure temperature, pressure, flow, velocity and pressure sensor belongs to thermal sensors. () <br> 25, moisture-proof layer in thermal insulation .inside and outside of the can. () <br>.