Weak current College】 【the air conditioning with cooling technology law questions and answers reference - 3-Power By】 【China power house network.

<br> 101, a spiral-screw compressors is constituted of yin and Yang rotor. (X) <br> 102, screw compressor with simple structure, Screw Machining accuracy requirements are not high. (X) <br> 103, centrifugal compressor .does not belong to the volume of compressors. (∨) <br> 104, screw compressors, centrifugal compressor can realize stepless energy regulation. (∨) <br> 105, centrifugal compressors of stand-alone refrigeration capacity, operating vibration is also large .. (x) <br> 106, compressor motor stator consists of copper or aluminium alloy casting in belt punching of steel sheets. (x) <br> 107, compressor motor operating voltage too high easily burned, and the voltage is too low it .is not easy to burn. (x) <br> 108, compressor motor winding insulation resistance of the enclosure should be less than 2 M Ω. (x) <br> 109, compressor motor windings wound again, if the direction is wrong, .the wound should be renewed. (x) <br> 110, piston-type compressors in the household, commercial, small and medium refrigeration and air conditioning applications. (∨) <br> 111, screw compressor in the medium than air-conditioning .chillers in widely used, and not to the low-temperature refrigeration. (x) <br> 112, scroll compressor refrigeration efficiency high, you can replace the various application areas of piston compressor. (x) <br> 113, when cooling capacity .greater than 15KW, screw compressors for refrigeration efficiency is the best. (∨) <br> 114, air cooled condensers, air side heat temperature average is usually to 4 ~ 6oC. (x) <br> The air cooled condenser 115, in .the face of the wind speed is usually take 2 ~ 3m / s. (∨) <br> 116, cooling water temperature and out of the condenser is typically 4 ~ 6oC. (∨) <br> 117, full fluid evaporator heat transfer .coefficient is lower than the dry evaporators. (x) <br> 118, two-level freon cooling system uses level throttling intermediate full cooling loop. (x) <br> 119, recuperator not only for freon cooling system, also used in ammonia .refrigeration systems. (x) <br> 120, pressure vessel design pressure P; P <<1.6MPa 10Mpa. (x) <br> 121, low pressure vessel's design pressure P: 0.1 ≤ P <1.6Mpa. ( .∨). .<br> 122, out from the condenser, the liquid refrigerant has no calories, after the throttle to receiver. (x) <br> 123, pressure vessels according to the size of the design pressure P voltage, MV, HV and EHV four .grades. (∨) <br> 124, heat transfer and pressure vessel is primarily used for complete media heat exchange. (∨) <br> 125, in the pressure vessel belongs to the second or third-class pressure vessels. (∨) .<br> 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%. (∨) <br> 127, pressure vessel's master plan (blueprints), must .be stamped with the seal of the pressure vessel design qualification (photocopying chapter.) (x) <br> 128, pressure vessel test archives, data retention periods should not be less than 5 years. (x) <br> 129, in refrigeration .equipment, the absorption of thermal evaporator and condenser thermal control are equal. (x) <br> 130, throttle bodies of all high-voltage step-down condensate into the evaporator condensate of low voltage. (x) <br> 131, throttle .bodies, apart from a throttle antihypertensive effect, but also has automatic adjustment of the refrigerant flow. (x) <br> 132, manual throttle valve is usually in the refrigeration systems of secondary structure or device used. (∨) <br> 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) <br> 134, floating ball valve can be used to have a free surface of the container for the .automatic adjustment of the amount. (∨) <br> 135, inner balance is the thermal expansion valves for evaporating coil resistance is relatively large evaporator. (x) <br> 136, exdpansion valve diaphragm in decentralized space and the evaporator outlet adjoining, .but not with the valve outlet. (∨) <br> 137, exdpansion valve opening and evaporating coil inner resistance. (X) <br> 138, thermal expansion valve of liquid components as negative resistance coefficient thermistor. (∨) <br> .139, capillary is a diameter of 200 3 ~ 6 mm copper pipe produced the most simple throttling device. (X) <br> 140, circulating fluid exchangers often has a gas-liquid separator and low-pressure fluid with dual function. (∨ .) <br> 141, washing oil separator for ammonia refrigeration systems. (∨) <br> 142, molecular sieve's strong Hygroscopicity, exposed to air can close up 20min saturation level. (X) <br> 143, ammonia filters using the mesh .to 2 ~ 3 0.2mm ply steel wire mesh manufacture. (X) <br> 144, dry filter for freon system liquid pipeline, its structure has the right angle and straight. (∨) <br> 145, when refrigeration system encountered icing ., dirty plug failure or maintenance, it regularly should replace dry filter. (∨) <br> 146, refrigerant in a capillary flow process, can be approximated as a constant pressure process. (X) <br> 147, expansion valve is the .sensor feel suction temperature conversion to pressure signal, and then passed to automatically adjust the diaphragm, valve opening. (∨) <br> 148, known throttle pore size refrigeration equipment of cooling capacity can be roughly estimated. (∨) <br> 149 ., R12, R22, R502 and freon cooling system, typically using a heat cycle. (X) <br> 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 andFreon is configured in the air-water heat exchanger. (X) <br>.