【 Weak current College 】 room air-conditioning and the distinction between civil air conditioning and application---Power By 【 China power house network 】

To be able to fully meet the requirements of the environmental conditions in the engine room room conditioner is in nearly 30 years, gradually developed a new aircraft types.　　Early use of room comfort air-conditioners, often because of the environmental temperature and humidity controls improperly and caused the engine room equipment, data transmission interference, static, and so on. While using a common and constant humidity air conditioners, although you can get more stable suitable environment, but the high operating costs and at the same time, there also exists the security, reliability and operational aspects of a series of shortcomings. First, the machine room exclusively used air conditioner features 1.1 high winds, little enthalpy difference and the same cooling capacity of air conditioners, room comfort conditioner recirculated air flow of about twice the larger, the enthalpy difference only half, machine room exclusively used air conditioner run time do not usually need dehumidification, recirculated air flow larger will make the unit in the air above the dew point, unnecessary running like comfort of air conditioning load to cope with the wet and had to make the air cooling to a dew point below, the unit can improve refrigerant evaporating temperature increase the thermal efficiency of the unit operation, thereby improving the operating economics.　　As a rule of thumb, sensible heat ratio as the unit of units 1.0 refrigeration capacity of the sensible heat energy consumption is higher than the unit 0.6 around 60%. Similarly, a computer room humidity indicators required relatively stable, larger circulation air flow will help stabilize the room humidity indicators, it is clear that in the refrigerating capacity of certain circumstances, air flow rate of increase will result in a reduction of enthalpy difference, which is usually set only sensible heat ratio considerably high condition run, that's exactly the characteristics of the load and the engineroom. Usually comfort air-conditioning cooling load of 30% in order to eliminate latent heat load, 70% is to eliminate the sensible heat load. On the engine room, the situation is very different, room mainly equipment powder out of sensible heat, indoor staff powder out of the summer heat load and enter the room of the fresh air of heat and moisture load (accounting for only 5% of the total load). And winter humidification is required instead of reducing humidity, even in the winter room is still a need to eliminate heat load, especially the program control room. In the light of the above characteristics, such as the General comfort of air conditioning units for engine room, it may cause the waste of energy. For example a heat load to the engine room 7056kcal/h, with machine room exclusively used air conditioning units, the total electricity consumption, and comfort air conditioning 2.7kw unit you need power, that is, more power 8.1kw twice. The same refrigerating capacity of air conditioners varies its air, comfort air-conditioners of the air flow and cooling capacity ratio is 1: 5 and humidifier air flow and cooling capacity ratio of 1: 3.5, machine room exclusively used air conditioner with a large amount of wind, small high enthalpy, sensible heat ratio, typically for 2kcal/enthalpy difference kg or so.　　In other words, the engine room of 90% to 95% is the sensible heat load, thermal load, the higher the sensible heat better than air greater demand. This requires the room's air conditioning system can provide larger air, room air than usual comfort air conditioning room required air 1.6 ~ 2 times.　　1.2 room heat load changes relatively large typically within 10% to 20% changes, this is because the host device is in a working state, consumption of different power consumption. Therefore, the engine room air conditioning system must be able to adapt to this change of load to enable electronic components work in the environmental conditions, ensuring the reliabilityof circuit performance. 1.3 sent back to the way diversity due to the wind and the electronic communication device for cooling the room air-conditioning system air supply air is diverse: on the air, air, and up-wind, Airways, side air, manufacturers typically use standardized means the development of a range of models to meet the different needs of users. Machine room exclusively used air conditioner air forms are sent on the next and last-under send. Room in the laying of anti-static floor, machine room exclusively used air conditioner uses the downside air supply last type, so that the air directly to the activities under the floor, thus the formation of static pressure Chamber under the floor, and then through the floor air, cold air evenly into the engine room, into the equipment cabinet. To this end, the machine room exclusively used air conditioner have sufficient air flow to the engine room heat away. This form of air conditioning can greatly improve efficiency, while also significantly save past habits can be piped air project expenses, reduce the construction cost, make the interior layout.　　This is the room ideal air supply pattern. Of course, the engine room air forms to the form with the equipment cooling. 1.4 filtering usually standard units, air filters are made of thick, intermediate filter, while in some imports of special units, from the design of structure, use of reserved-filters or filters installation location selection, based on user needs (such as clean operating room wait you choose-a high-performance filters). As long as the user request, the filtration system easy to replace the filter or add filter by way of an upgrade.　　Generally A level cleaning requires the use of high-efficiency filter, or B level cleaning requires the use of high or intermediate filter region, even the C level cleaning requirements should also use effect filters. However, the comfort of air conditioning as well as regular and constant humidity air filters generallyonly early, if you need to increase filtration efficiency, can only be converted, but often require additional fan, increase the pressure to avoid air conditioners for installing efficient or HEPA filter and air capacity has declined considerably.　　1.5 reliability higher for room air conditioning system with high reliability requirements, the machine room exclusively used air conditioner in the structure and control system design and manufacturing as well as air conditioning systems, and so must be appropriate to adopt a series of measures, such as setting the fallback unit or stand-by control unit, microcomputer control system automatically on unit running real-time diagnosis, or to be already a failure alarm, automatic backup using the backup unit or switch failure unit control unit or fault element. We all know, the machine room exclusively used air conditioner control system functionality than much comfort air conditioning perfect. Control the performance of the system and air conditioning system is closely related to technical and economic performance.　　Many machine room exclusively used air conditioner production enterprises, specializing in the development of a range of the controller as an integral part of the air conditioning system. Electronic controller or PC control is already widespread, some enterprises have fuzzy control technology in the computer room air conditioner system. MachineRoom air conditioner unit adopts advanced reliable microcomputer control system. Control system consists of two main parts, namely, the intelligent controller and the monitor component I2-manager Tmaster. Controller provides powerful analog and digital control capabilities to meet a wide range of monitoring and control functions, including real time clock, RS232/RS485 communication interface and the standard network connection.　　Large-screen LCD monitor, Multiformat display of authentic Chinese, more suitable for Chinese users demand. Operators are available through the keyboard/display component queries the device running and various fault logging, adjust the set parameters, guaranteeing maximum operating efficiency. Control system can control the same unit within the compressor reduces the time to start, start current equilibrium within the same unit, the compressor working time, prevent compressor frequent start. Multiple units can be concatenated to each other, each backup.　　Multiple units can automatically start when the separation to reduce starting current, balancing the different units of work time. This will help to raise the private life of the air conditioning unit and operation reliability. 1.6 annual run both refrigeration large and medium-sized computer or programmable switches, are required to run the air conditioner refrigeration year. While the winter cooling operation to resolve stability condensing pressure and other related issues.　　The majority of machine room exclusively used air conditioner in the outdoor air temperature dropped to-15 ° c is still running, and the use of refrigeration and glycol cooling unit, can be used in outdoor temperatures down to-45 ° c can still run in refrigeration. And this is in stark contrast to the comfort of air conditioning humidifier or General, in such circumstances, does not work. 1.7 design points correspond to run the point if the comfort air-conditioners used as room air-conditioning system, plant room to run the point is: winter: 20 ± 2 ° c, in summer: 23 ± 2 ° c, and the comfort of air conditioners design point temperature is 27 ° c, so the actual cooling unit capacity than the samples marked ratings low 10% to 25%.　　In addition, the operating point deviations from the design point, to some extent, the mechanical performance of parts due to deviation from the best operating point, thus affecting the overall status of matching unit, is not conducive to the full unit performance and high efficiency operation. However, due to the machine room exclusively used air conditionerrunning point as the design point, the unit is always the best operating point, which fundamentally avoids these problems.　　To sum up, according to the engine room load characteristics and features, you need to design an integrated these requirements into one realization of air conditioners, to handle dry cooling condition-based air treatment process.　　1.8 life General machine room exclusively used air conditioner manufacturers design life is the minimum is 10 years, the continuous running time is the average 86400 hours without rate 25000 hours practical application process, the machine room exclusively used air conditioner can run for 15 years. According to the household appliance industry standards, comfort air conditioners based design life annual run for half a year, for three years, no continuous running time index, average non-fault time 5000 hours, only suitable for continuous operation, the practical use, comfort air-conditioners can run continuously for 3 ~ 5 years, more than the machine room exclusively used air conditioner a difference of 3 times. 1.9 machine room exclusively used air conditioner and comfort air-conditioners difference table 1-1 machine room exclusively used air conditioner and General comparative comfort air conditioning unit