【 Weak current College 】 the air conditioning with cooling technology law questions and answers (4)---Power By 【 China power house network 】

1114, in the still point to the same liquid internal on all directions of pressure are not equal. (Ⅹ) 1115, compressor units with the consumption of reactive power and circulation to the theory of units equivalence theory. (Growth) 1116, select cascade refrigerating cycle, one reason is the evaporation pressure too low hematocrit brought inspiration. (H) 1117, salt water as refrigerant should make its crystallization temperature below the refrigerant and evaporation temperature 6 ~ 8 oC. (Growth) 118, LIBR absorption chiller work in a vacuum. (H) 119, the main type of evaporative condenser water evaporation, condensation heat for refrigerant. (H) 120, contained in refrigerating systems, evaporators most in wet vapor zone. (Growth) 121, in General, oil separator is installed in the condenser and filters and pipelines between. (H) 122, hermetic compressor drying temperature of more than 200 oC. (H) 123, refrigerant in the filling must elapse before drying dehydration rear section. (Growth) 124, central air conditioning system using fan for axial fan. (H) 125, squirrel cage induction motor control reverse local French will be winding y-Δ conversion. (H) 126, for an air conditioning system to set the dew point temperature and humidity control, summer is cooling down and wet processes, typical control method: dew point temperature control system, the second heating control system and room temperature control system to combine. (Growth) 127, repair of refrigeration and air-conditioning equipment, in order to protect the bolt, the use of activating wrench and tighten bolts pipe pliers. (H) 128, two of the same caliber and copper tube team of welding, it is best to use cylindrical flaring. (Growth) 129, fault analysis, description and troubleshooting problems. (Growth) 130, materials accounting, the main consideration cost level. (X) 131, can measure temperature, pressure, flow, velocity and pressure difference to sensor belongs to thermal sensors. （ ∨ ）。 132, regardless of job quality refrigeration cycle can be in any bump-enthalpy diagram on the chart. (Ⅹ) 133, moisture-proof layer settings to the insulating layer is available inside and outside. (Ⅹ) 134, refrigeration compressor property to cold calculation is based on the actual transportation volume and known unit volume cooling capacity. (Growth) 135, condenser cooling water and condenser is inversely proportional to the thermal load. (Ⅹ) 136, condenser heat hot area F calculation basis is Qk, K, Δ t. (Growth) 137, capillary and expansion valve collectively throttling element, it turned to the evaporator flow out to high pressure refrigerant liquid pressure, throttle, supply condenser. (Ⅹ) 138, on the air after cooling down and wet processing temperature, moisture content, enthalpy value increase, relative humidity decreases. (Ⅹ) 139, work monitoring system is to ensure personal safety and operation of the main measures correctly, care personnel and security technology level and the operational staff of sibling. (Ⅹ) 140, LIBR absorption chiller and molten Crystal tube prevents crystallization fault to occur. (Ⅹ) 141, freon refrigerants have dissolved oil grease capacity, so the liquid freon refrigerant oil lubricating oils, dissolved in equally in lubrication or stripping with fluorine. (Growth) 142, room air conditioner AC frequency conversion motor is a three-phase AC synchronous motor. (Ⅹ) 143, closed cooling water circulation system, the pipeline is not communicating with the atmosphere, thus cooling the air by the surrounding temperature and wet-bulb temperature. (Ⅹ) 144, fan-coil units, local regulation water regulation and has air conditioning 2 basic methods. (Growth) 145, an air conditioning system in the summer run time, the main drawback is the new return air ratio is not easy to regulate. (Ⅹ) 146, under certain conditions, isothermal humidification in air handling increased after the moisture content, temperature enthalpy value, unchanged, the relative humidity increases. (Growth) 147, moisture content d refers to air the per kg of weight with water vapour. (Ⅹ) 148, inner balance thermostatic expansion valve of the temperature of the package should be placed away from the compressor suction inlet 1.5m. (Ⅹ) 149, too many refrigerant injection will cause Cold reduced and producing hydraulic hammer. (Growth) 150, and moisture content line and f = 100% the intersection curve corresponding to a temperature of air in the wet-bulb temperature. (Ⅹ) 151, heat exchanger materials of high thermal conductivity, heat transfer coefficient is high. (Ⅹ) 152, dew point temperature of saturated air and dry-bulb temperature, wet-bulb temperature is the same value. (Growth) 153, take one kg moisture content for 20g/kg of dry air of humid air, with the amount of water vapor to 20g. (Ⅹ) 154, a piston-type compressor discharge gauge pressure value is 0.6Mpa, inspiratory pressure value is-0.03Mpa, its pressure difference to 0.57Mpa, compression ratio is 20. (Ⅹ) 155, wet air containing water vapor reduce, its relative humidity be reduced. (Ⅹ) 156, heat exchanger, heat transfer coefficient α of size depends on the nature of the heat transfer material, the unit is Kj/(m.h. Oc) 157, wet air of dry and wet bulb temperature difference, the larger the characterization of the air humidity. (Growth) 158, compressors for direct compression gas consumes shaft power known as friction power. (Ⅹ) 159, due to the comfort of air conditioning and refrigeration system expansion valve produces ice barrier, causing no refrigeration. (Ⅹ) 160, in the same evaporation temperatures, than R12 refrigerant R22 evaporation pressure low. (Ⅹ) 161, for compression refrigeration system, the compressor suction superheat, condenser should be undercooling. (Growth) 162, air-conditioning system air supply ratio refers to the total amount of wind circulation in outdoor air. (Ⅹ) 163, 8AS-12.5 compressors, its uninstall institutions push rod is too long, it will cause a fault cannot beuninstalled. (Ⅹ) 164, reverse Carnot cycle of refrigerating factor size depends entirely on the cold source and the temperature of the heat source. (Growth) 165, wet air enthalpy increases, certainly is endothermic process, so the temperature will rise。 (Ⅹ) 166, one, multiple choice, 1, closed system refers to the system and the outside world (C) (A) var swap (B) No heat exchange (C) non-quality Exchange (D) no Exchange 2, for thermal throttling process, the following assertion error is (D) (A) due to adiabatic process throttling, friction Sassafras refrigerants of entropy increase (B) because the runner cross-section suddenly shrinks, the refrigerant to overcome local resistance and pressure drops (C) refrigerants in the throttling device into, exit enthalpy equivalent (D) due to adiabatic process, so the temperature does not change 3, evaporator refrigerant evaporating dryness x change to (A) (A) by gradually increasing the x = 0 to x = 1 (B) x = 0 no change (C) consists of x = 1 and gradually reduced to x = 0 (D) x = 1 unchanged 4, certain quality some ideal gas, if the pressure remains unchanged, its volume increases by (A) (A) temperature rise (B) temperature decrease (C) temperature does not change (D) the temperature and volume without any relationship to 5, for changing process, when the variable exponent n = k, a process to (D) (A) pressure process (B) sizing process (C) fixed temperature process (D) for entropy process 6, for changing process, when the variable exponent n = 1, a process to (C) (A) pressure process (B) sizing process (C) fixed temperature process (D) for entropy process 7. for changing process, when the variable exponent n = +-infinity, a process of (B) (A) pressure process (B) sizing process (C) fixed temperature process (D) for entropy process 8, the following is correct as (C) (A) heat can spontaneously from cryogenic to high temperature object body (B) you can create an engine, it can be made from a heat source, so that the full heat into mechanical energy ((C) all thermodynamic process has a direction, the conversion of their energy use has certain limits (D) of the engine cycle efficiency of maximum value is 100% 9, refrigerants of quality and volume of refrigerants (C) (A) temperature proportional to (B) volume inversely (C) is inversely proportional to the density (D) the pressure inversely 10, heating cycle heating coefficient is defined (B) (A) from the absorption of heat at low temperature heat source and recycling ratio of consumption of accomplishment (B) to high-temperature heat source emits heat and recycling ratio of consumption outside for (C) from the absorption of heat at low temperature heat source and to high temperature heat source emits heat ratio (D) than the same heat source of refrigeration cycle refrigeration coefficient less 111, refrigerant flowing through the condenser condensation (A) (A) give off heat, and let the heat value equal to the enthalpy (B) give off heat, enthalpy value increase (C) absorb heat from the outside world, enthalpy value increase (D) as a result of condensation process pressure unchanged, enthalpy value unchanged 12, a reverse Carnot cycle of high-temperature heat source temperature is 28 oC, low temperature heat source temperature is-18 oC. The refrigeration cycle refrigerating factor () (A) (B) 5.5 0.39 (C)-0.39 (d) 6.513, for cyclic process, working through a series of state changes and return to the initial state, its parameters change (D) (A) internal energy, heat, power of 0 (B) the amount equal to the outside world can change to system of heating and the difference between the external output power, and is not equal to 0 (C) internal energy variation is greater than 0, heat, power of variation depending on the circumstances (D) the amount can be changed to 0, external output power equal to the outside world and to the system's thermal 14, and corresponds to the absolute 28oC temperature scales to (C). (A)-(B) 82.4K 245K (C) 301K (D) 245K15,on the critical state of refrigerants, the following is true of (A) (A) for the refrigerant, its critical temperature should be much higher than the ambient temperature (B) when the pressure is higher than the critical value, only increase the pressure to make the changes from a gaseous refrigerant liquid (C) critical pressure is the maximum working pressure (D) refrigeration cycle condensing pressure is approaching critical pressure, the higher the recycling efficiency 8, the comprehensive and thorough overhaul, exclude all potential risks, adjust the device to the best State known as (D) (A) the warranty (B) minor repairs (C) in (D) overhaul 9, handheld tachometer test speed centrifugal, you should use (D) (A) circle friction head, read from the table to the conversion of reading (B) taper friction head, read from the table to the conversion of reading (C) friction head, can be read directly from the table on the speed of reading (D) taper friction head, can be read directly from the table and reading speed, use 10 wet and dry bulb thermometers ventilation solder, to equipment placed in the GEODESIC environment so that the instrument to temperature (C) (A) lower than the wet bulb temperature (B) higher than the wet bulb temperature (C) equal to the temperature of the environment (D) equal to the environment of dew point temperature and atmospheric pressure gauge 11, use (B) to consider (A) the effect of humidity (B) effect of temperature (C) the effect of wind speed (D) the effect of season 12, vane anemometers suitable measurement (D) (A) air duct Mainland air speed (B) table coolers and air flow speed in (C) air conditioning room interior air speed (D) the return of fresh air, air, air velocity gauges 13, tilt decline (C) (A) can be used to measure pressure (B) can be used to measure pressure differential (C) used in conjunction with the pitot pressure measurement (D) used in conjunction with the pitot tube measuring pressure difference 16, as refrigerants in the evaporator temperature of boiling vaporization, same pressure 5oC compressor suction temperature 15oC, the compressor suction superheat oC for (B). （A）15 （B）10 （C）5 （D）-10