Weak current College】 【impact precision air conditioning factors effect.

<br> Air conditioning and refrigeration systems brief: air conditioner refrigeration system consists of a compressor, condenser, expansion valve and evaporator, whose works as follows: refrigerant pressure temperature boiling, lower the cooling objects or fluid temperature. Compressor constantly pumping evaporator steam and .compressed to the condensing pressure and then sent to the condenser, in under the pressure of constant pressure cooling and condensation into liquid cooling and condensation of refrigerants, during the heat to the cooling medium (usually the air conditioning used), and condensation pressure correspond to .the condensing temperature must be higher than the temperature of the cooling medium, the liquid after condensation through the expansion valve or other throttling element enters the evaporator. <br> <br> Throughout the cycle, the compressor has a compression and transmission of refrigerants and .caused the evaporator, condenser of low pressure in the role of the high pressure, the heart of the entire system; throttle on the refrigerant from throttling antihypertensive effect and regulates access to the refrigerant flow evaporator; evaporator is an output device, the chilling refrigerant in .the evaporator absorption cooling body heat, so as to achieve the purpose of producing cold; condenser is an output device, the heat from the evaporator in the consumption of heat even compressor heat reactive power conversion has been in condenser cooling medium. <br> < .br> Air conditioning energy-saving air conditioner in the present management is a relatively weak links, energy wasting more serious, so strengthening air-conditioning maintenance management and technological innovation, energy-saving can be achieved. From the air conditioning of pressure-enthalpy .diagram, only run in the best condition and condition, can play a maximum of air-conditioning refrigeration capacity to achieve the purpose of the air conditioning energy saving. Air conditioning energy saving and maintenance departments should run cost, maintenance, maintenance point of view. .<br> <br> Because the air conditioning compressor for four large, by the investment cost efficiency, thus affecting air conditioning effects of specific factors are as follows: <br> <br> First, the evaporation temperature refrigeration system <br> < .br> Evaporator refrigerant evaporating temperature, should be better than the air temperature is low, so that the heat of the engine room are passed on to the refrigerant, the vaporized refrigerant absorbed calories into gas by compressor sucked away, making the evaporator pressure from heating .evaporation gas too much pressure, thereby evaporating temperature also increases, which affects a cooling effect, and this is the combination of temperature and air conditioning of investment costs (to lower the temperature, you must increase the air circulating air volume, increase air conditioning evaporator ., lead to the increase in the cost of air conditioning), and the costs of energy consumption of refrigeration work and comprehensive. In our computer room air conditioning, evaporator is direct evaporative, this difference in temperature is 12-14 ° c (see air .conditioning and refrigeration technology manual P746), but in fact, due to various adverse factors, not very good guarantee the temperature difference, sometimes in more than 20 ° c (evaporator on the ice), so that the energy consumption increases. By calculation, .no change in the condensation temperature, evaporation, the lower the temperature, the compressor refrigeration effect reduced exhaust temperatures. Refrigeration system evaporator of refrigerants, reduce evaporation temperature 1 degree, to produce the same amount of cold, low power about increased 4%. < .br> <br> Factors affecting evaporation temperature are the following: <br> <br> 1. evaporator tube knot oil: under normal circumstances because of lubricants and freon miscible, in the heat exchanger does not form a film, can not worry oil .film thermal resistance, but additional oil case, you must use the same original grade lubricant to prevent oil film is formed. <br> <br> 2. air filter clogging: filter must be replaced periodically to ensure that air conditioning required recirculated air flow .. <br> <br> 3. drying filter blocked: in order to guarantee the normal cycle refrigeration ji, refrigeration system must be kept clean, dry, if the system has impurities, resulting in dry filter blockage, systems for liquid difficulties, the .impact of the refrigeration effect. <br> <br> 4. refrigerant too little, append the freon. <br> <br> Second, the expansion valve opening time is wrong <br> <br> Must be regularly measured expansion valve superheat ., adjust the expansion valve opening. Steps are as follows: <br> <br> Downtime. Will digital thermometer with probe is inserted into the evaporator back-port of insulation, prepared to read out the evaporator to gas temperature T1. The pressure gauge .and low pressure valves of the compressor direct links (such as no-voltage HIRO40UA valve for air conditioning, pressure gauges and the connector on the evaporator connected), ready to read out the evaporator outlet pressure corresponding temperature T2. <br> <br> .Power on, let the compressor to run more than 15 minutes, to a healthy state, so that the system pressure and the temperature reaches a constant value. Field-measured pressure pressure 18Kg/cm2, high pressure switch is always closed and running, the .system has little effect on, not for special processing. <br> <br> Read the evaporator outlet temperature T1 and the evaporator outlet pressure corresponding temperature T2, superheat is the difference between the two readings. Note that you must read these two readings, .because the expansion valve is a mechanical structure, its action will cause a change in T1 and T2. Expansion valve superheat in 5-8 ¡ .æ, if not, make any adjustments. Specific adjustment steps: <br> <br> 1) removed the protective cover of the expansion valve; <br> <br> 2 turn the adjusting screw 2) - 4 ring; (professional air .conditioning the expansion valve generally use Struts-and-gear-type powder, powder-gear-type is to use a small gear driven a large gear, adjust the number of turns of the more general can tune 2 ~ 4 ring; the number of .column-type Adjustable ring is relatively small, each exercise 1 / 4 turn; O65 air conditioning the expansion valve with powder-type gear type) <br> <br> 3) and 10 minutes from the new measure whether superheat in normal range, .that is not the case, repeat the steps above. Adjustment process must be carefully. (If the expansion valve oil plug serious, ethanol for cleaning, then replace the; lost of expansion valve should be replaced; replacement, note the installation location and good .insuranceTemperature) <br> <br> Third, the refrigeration system condensing pressure <br> <br> 1. air conditioning condenser dirty. Room air conditioners air cooled condensers are commonly used, it consists of multiple sets of coil, coil plus fin, .to increase the heat transfer area air side, at the same time, using the flow of air blower speeds to increase air side effect of heat transfer. Tablets from smaller, plus the room air-conditioning continuous long use, saving the debris and dust sticking .condenser fins, causing the air cannot flow through the condenser, the effect of thermal resistance increases, resulting in condensation heat transfer of results, the effect of high pressure side pressure rise, while reducing the cooling efficiency, consumption has more power, higher condensation pressure .per cm2, the power consumption 1kg / 6 ~ 8% increase. <br> <br> Countermeasures: the air conditioning use environment, depending on the situation of ash, regular air conditioning, washing machine, by using a water gun or compressed air .from Introversion washes air conditioning condenser, clear the report in the condenser on the debris and dust, twice a year outside of the room air-conditioning machine for washing, to be able to guarantee good heat dissipation, can save a lot of energy. < .br> <br> 2. the condenser is improperly configured. <br> <br> Some manufacturers in order to save costs, and the pursuit of profit maximization, deliberately configured side small condenser, to reduce air conditioning effect, try to avoid when .air-conditioning design, but sometimes also occur frequently caused air conditioning in the summer high pressure alarm, air conditioning, frequently washing machine useless, seriously increased the workload of the maintenance staff, you must replace the condenser. If the condenser configuration is small, .there would be constantly in summer high pressure failure, maintenance personnel were exhausted, waste a lot of manpower and material resources. <br> <br> 3. the system of internal air. <br> <br> If air conditioning vacuum is not .enough, when you are not careful with liquid, snuck into the air. Air in the refrigeration system is harmful, it will affect the refrigeration of condensation of steam ji exothermic, condenser pressure increased, as the then condensing temperature 35 degrees, the corresponding condensing .pressure 12.5kg/cm2 gauge pressure, gauge pressure can actually may be which 14kg/cm2 extra 1.5kg/cm2 air occupies in the condenser (Dalton's law), as the exhaust pressure, exhaust temperature rise also, cooling capacity reduction, power consumption increased ., so have to clear the air in the high-pressure system. <br> <br> Solutions: for on air operations. In the shut down cases, from the vent or condenser thread blocking service for deflated deflated. <br> <br .> 4. too much refrigerant-note, condensing pressure will rise. Due to excess refrigerant will occupy the area of the condenser, resulting in condensation area declined, so condensation effect of variation. <br> <br> Conclusions of the <br> .<br> Through these means, you can ensure the best conditions of work in the air, not only reducing air conditioning failure rate, and a single air conditioning during the summer months can save 10-20% of energy and, thus, strengthening air .-conditioning maintenance on air conditioning cooling effect and air-conditioning life, especially energy has an important significance. <br> <br> <br>.