Weak current College】 【the air conditioning with cooling technology law questions and answers (2) --- Power By】 【China power house network.

<br> 105, centrifugal compressors of stand-alone refrigeration capacity, operating vibration is also large. (X) 106, compressor motor stator consists of copper or aluminium alloy casting in belt punching of steel sheets. (X) 107, compressor motor operating .voltage too high easily burned, and the voltage is too low it is not easy to burn. (X) 108, compressor motor winding insulation resistance of the enclosure should be less than 2 M Ω. (X) 109, compressor motor windings wound again ., if the direction is wrong, the wound should be renewed. (X) 110, piston-type compressors in the household, commercial, small and medium refrigeration and air conditioning applications. (Growth) 111, screw compressor in medium above air conditioning chillers .in widely used, and not to the low-temperature refrigeration. (X) 112, scroll compressor refrigeration efficiency high, you can replace the various application areas of piston compressor. (X) 113, when cooling capacity greater than 15KW, screw compressors for .refrigeration efficiency is the best. (Growth) 114, air cooled condensers, air side heat temperature average is usually to 4 ~ 6oC. (X) 115, air-cooled condenser head wind speeds usually take 2 ~ 3m / s. (Growth) .116, cooling water temperature and out of the condenser is typically 4 ~ 6 oC. (Growth) 117, full fluid evaporator heat transfer coefficient is lower than the dry evaporators. (X) 118, two-level freon cooling system uses level throttling intermediate .full cooling loop. (X) 119, recuperator not only for freon cooling system, also used in ammonia refrigeration systems. (X) 120, pressure vessel design pressure P; P <<1.6MPa 10Mpa. (X) 121, low .pressure vessel's design pressure P: 0.1 ≤ P <1.6Mpa. (∨). .122, out from the condenser, the liquid refrigerant has no calories, after the throttle to receiver. (X) 123, pressure vessels according to the size of the design pressure P voltage, MV, HV and EHV four grades. (Growth) 124 ., heat transfer and pressure vessel is primarily used for complete media heat exchange. (Growth) 125, the pressure vessel belongs to the second or third-class pressure vessels. (Growth) 126, plate heat exchanger volume is small, compact structure, its .volume is also wearing a hot area of shell and tube heat exchanger small 60%. (Growth) 127, pressure vessel's master plan (blueprints), must be stamped with the seal of the pressure vessel design qualification (photocopying chapter.) (X) .128, pressure vessel test archives, data retention periods should not be less than 5 years. (X) 129, in refrigeration equipment, the absorption of thermal evaporator and condenser thermal control are equal. (X) 130, throttle bodies of all high- .voltage step-down condensate into the evaporator condensate of low voltage. (X) 131, throttle bodies, apart from a throttle antihypertensive effect, but also has automatic adjustment of the refrigerant flow. (X) 132, manual throttle valve is usually in the .refrigeration systems of secondary structure or device used. (Growth) 133, ball valves and the corresponding container with the same level, because the valve and the corresponding container of liquid portion take over adjoining. (X) 134, floating ball valve can be used .to have a free surface of the container for the automatic adjustment of the amount. (Growth) 135, homeostasis is the thermal expansion valves for evaporating coil resistance is relatively large evaporator. (X) 136, exdpansion valve diaphragm in decentralized space and the evaporator .outlet adjoining, but not with the valve outlet. (Growth) 137, exdpansion valve opening and evaporating coil inner resistance. (X) 138, thermal expansion valve of liquid components as negative resistance coefficient thermistor. (Growth) 139, capillary is a diameter .of 200 3 ~ 6 mm copper pipe produced the most simple throttling device. (X) 140, circulating fluid exchangers often has a gas-liquid separator and low-pressure fluid with dual function. (Growth) 141, washing oil separator for ammonia refrigeration .systems. (Growth) 142, molecular sieve's strong Hygroscopicity, exposed to air can close up 20min saturation level. (X) 143, ammonia filters using the mesh to 2 ~ 3 0.2mm ply steel wire mesh manufacture. (X) 144, dry .filter for freon system liquid pipeline, its structure has the right angle and straight. (Growth) 145, when refrigeration system encountered icing, dirty plug failure or maintenance, it regularly should replace dry filter. (Growth) 146, as a refrigerant in a .capillary flow process, can be approximated as a constant pressure process. (X) 147, expansion valve is the sensor feel suction temperature conversion to pressure signal, and then passed to automatically adjust the diaphragm, valve opening. (Growth) 148, known throttle .pore size refrigeration equipment of cooling capacity can be roughly estimated. (Growth) 149, R12, R22, R502 and freon cooling system, typically using a heat cycle. (X) 150, gas liquid heat exchangers can improve the refrigerant vapor superheat and refrigerant .liquid subcooling, the refrigeration system can run safely and effectively, so in ammonia system and freon should be configured in the air-water heat exchanger. (X) 151, typically, single-stage freon compressor maximum compression ratio should not exceed 8. ( .X) 152, single-stage vapour compression refrigeration system can only achieve the evaporation temperature-20 ~-40Oc. (Growth) 153, two-stage compression-compression refrigeration system usually uses the level throttling intermediate full cooling loop. (Growth) 154 ., at the level of throttle intermediate full cooling system, high pressure compressor suction is intermediate pressure hot steam. (X) 155, intermediate incomplete cooling high-pressure compressor suction temperature will be higher than the intermediate full cooling of the air temperature. (Growth .) 156, R717 maximum pressure difference to Pk-Po ≤ I.6Mpa. (Growth) 157, R22 in high condensing pressure of maximum pressure difference to Pk-Po ≤ I.8Mpa. .(Growth) 158, single-stage compression refrigeration system uses standard evaporation temperature-81.5oC refrigerant R13 to low temperature, producing-75oC. (X) 159, the use of R22 and two-stage R13 compression system consisting of cascade refrigerating system, .its evaporation temperature up to-70 ~-90Oc. (Growth) 160, using two-stage compression system consisting of multiple overlapping refrigeration system, low-temperature extraction-140oC. (X) 161, uses the ternary complex stack of refrigeration cycle can .obtain-120 ~-150oC at low temperature. (X) 162, two-level vapour compression refrigeration cycle start the steps are: first start the low-pressure compressor, and then start the high-pressure compressor. (X) 163, R717 ., two-level vapour compression refrigeration system should take intermediate loop incomplete cooling. (X) 164 and cascade refrigerating system startup step is: first start the temperature section, and then start the low-temperature parts. (Growth) 165, low-speed .air conditioning duct system-wind of 3 ~ 5m / s. (X) 166, without changing the humid air enthalpy-Sik, the wet air temperature, air humidity. (X) 167, to air enthalpy implantation unchanged conditions reduce the temperature of .the air, it should be on the air humidification, ie increases the moisture content. (Growth) 168, refrigeration and air conditioning equipment product nameplate marking of cooling capacity to the actual cooling capacity. (X) 169, air conditioner, heat pump for .heating and electric heating consumes power, according to the law of conservation of energy, consumes the same amount of energy they will get the same amount of heat. (X) 170, air conditioner evaporator temperature, low, and the greater the difference in indoor .air, indoor air, the faster the temperature dropped. (X) 171, use R22 of air-cooled air conditioner, the compressor suction and discharge pressure of maximum pressure differentials not exceeding 1.56Mpa. (Growth) 172, using R12 refrigerant in the .refrigeration equipment, the refrigerant in the evaporator of evaporation temperature-29.8oC. (X) 173, high-temperature food refrigerator of applicable temperature adjustment range 0 ~-10oC. (X) 174, low temperature test equipment can provide-80 ~ 80oC .temperature environment. (X) 175, high and low temperature test equipment used for the simulation of climatic conditions on the ground, environmental test equipment for analog high altitude meteorological conditions. (Growth) 176, mechanical freezers are direct evaporative air cooling to control the .temperature inside the car. (X) 177, insulated refrigerated vehicles only and urban urban, suburban and short-distance transport, use limitations. (Growth) 178, mechanical refrigerating cars can maintain passenger compartment temperature-15 ~ 18 oC. (Growth) .179, ice refrigerator car can adapt to a variety of fresh freight, railway transport of frozen goods. (X) 180, marine refrigeration equipment manufacturers must comply with the State of the marine construction norms and classification societies. (Growth) 181, ship refrigerated .compartment refrigeration system and food refrigeration system are often designed as parallel systems for emergency purposes. (Growth) 182, China's marine refrigerated container mm1A-built-in refrigeration unit type refrigerator. (Growth) 183, absorption chiller energy jump, has many advantages. .(X) 184, chillers with a piston, screw and scroll, centrifugal, absorption, and many other categories. (Growth) 185, inverter type air conditioner circuit will input single phase AC 220V 50 Hz is converted to a different frequency single phase alternating .current. (X) 186, inverter type air conditioner use converter to change the compressor speed for compressor capacity control. (Growth) 187, constant temperature and humidity controlled indoor relative humidity of the air conditioner is 50% ~ 70% control accuracy of + .-10%. (Growth) 188, Cabinet cooler can control the indoor temperature is 18-25oC, control accuracy +-1oC. (X) 189, hot and cold air blower can be cooling, dehumidification, heating, humidifying. (X) .190, machine room exclusively used air conditioner to meet 30 ~ 60 / h high ACH requirements. (Growth) 191, centralized air conditioning air-conditioning room General requirements remain greater than the positive pressure 50Pa. (X) 192, centralized air conditioning system .also known as full air system. (Growth) 193, room air conditioner compressor motor with a phase motor, generally do not set a specific start unit. (Growth) 194, Toshiba refrigerator temperature sensor is a negative temperature coefficient thermistor, when the temperature .decreases to increase its resistance. (Growth) 195, split-type air conditioner control circuit from the primary circuit and outdoor side circuit made up of two parts. (X) 196, Toshiba refrigerator power circuit, DC voltage for relay use 6.8V, .DC 14V voltage workers three-tube and integrated circuits. (X) 197, Toshiba refrigerator when exposed to temperatures gradually decreases, temperature detection circuit output voltage Us will improve. (X) 198, Toshiba transformer T801 refrigerator will input AC 220V voltage to voltage .DC 16V. (X) 199, air-conditioner choose strong cold or weak cold is the fan speed by varying the indoor, change the exhaust volume. (Growth) 200, heat pump air conditioner defrosting by reversing valve to achieve, it is not .necessary to separate the temperature of heating wire to defrost. (Growth) 201, high and low pressure controller role is when the exhaust pressure is higher than the set value or suction pressure higher than the set value, cut off power supply allows the compressor to .stop working. (X) 201, high and low pressure controller with two air Chamber. Respectively and the exhaust pipe and the compressor suction line. (Growth) 203, thermistor-type semiconductor temperature controller for two gas chamber, respectively and the exhaust pipe .and the compressor suction line. (Growth) 204, motor around team core insulation resistance test using 500V megohmmeter, cold resistance shall be not less than 2 M Ω. (X) 205, WSZ-2-humidity regulator can be used for General accuracy .or precision constant temperature and humidity control, is not available for the comfort of air conditioningEnergy-saving control. (X) 206, air conditioners, electric-heating and heat pump heating, get the same thermal geothermal energy consumed. (∨).