【 Weak current College 】 the air conditioning with cooling technology law questions and answers 7---Power By 【 China power house network 】

1111, thevenin theorem is also known as equivalent voltage source theorem. （∨）
1112, supply voltage changes do not affect the three-phase induction motor and torque. （Ⅹ）
1113, increasing the heat transfer area, one of the ways is to increase the pipeline length. （∨）
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. （∨）
1116, select cascade refrigerating cycle, one reason is the evaporation pressure too low hematocrit brought inspiration. （Х）
1117, salt water as refrigerant should make its crystallization temperature below the refrigerant and evaporation temperature 6 ~ 8oC. （∨）
118, LIBR absorption chiller work in a vacuum. （х）
119, the main type of evaporative condenser water evaporation, condensation heat for refrigerant. （х）
120, contained in refrigerating systems, evaporators most in wet vapor zone. （∨）
121, under normal circumstances, the oil separator is installed in the condenser and filters and pipelines between. （х）
122, hermetic compressor drying temperature 200oC. Department of more than （х）
123, refrigerant in the filling must elapse before drying dehydration rear section. （∨）
124, central air conditioning system using fan for axial fan. （х）
125, squirrel cage induction motor control reverse local French will be winding-Δ conversion y. （х）
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. （∨）
127, repair of refrigeration and air-conditioning equipment, in order to protect the bolt, the use of activating wrench and tighten bolts pipe pliers. （Х）
128, two of the same caliber and copper tube team of welding, itis best to use cylindrical flaring. （∨）
129, fault analysis, description and troubleshooting problems. （∨）
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. （∨）
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. （∨）
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. （∨）
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 airconditioning 2 basic methods. （∨）
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. （∨）
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. （∨）
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, saturated air and dew point temperature, dry-bulb temperature, wet-bulb temperature is the same value. （∨）
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 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. （∨）
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. （∨）
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 be uninstalled. （Ⅹ）
164, reverse Carnot cycle of refrigerating factor size depends entirely on the cold source and the temperature of the heat source. （∨）
165, wet air enthalpy increases, certainly is endothermic process, so the temperature will rise. （Ⅹ）