【School】 room for the weak air conditioning and comfort air conditioning --- Power By comparing the advantages of weak home network 【China】..

<br> of PBX rooms, computer rooms, high-precision electronic equipment and environmental requirements of temperature and humidity high places, the use of dedicated precision air conditioning equipment to ensure not only make a good, reliable work environment run. extend the useful .life of equipment and operating costs in energy than the same level of comfort air conditioning greatly reduced.. Over the years, as China's economy is developing, the productivity and production is still a gap compared with developed countries, people are accustomed to hard work, .thrift, still can not keep up in the knowledge requirements of the times of rapid economic development.. Some comrades with the communications sector contacts, especially in poor areas of small cities and some comrades in understanding the existence of such a misunderstanding, namely: use .of precision air conditioning investment, operating costs high, uneconomical, it was said: Buy. a precision air-conditioning might as well buy two, even three general air conditioning, if one is broken, the other as a backup still can guarantee the normal .room temperature, while the cost of inputs is only half, or even less, buy more sophisticated air-conditioning. not worth to spend that kind of cost, which is why many medium and small cities, small program-controlled room, with the following .areas of communications station, and remote areas of the Big Brother room is currently a large number of unattended use three, five Guiji the. reason, it is true, precision air conditioning and comfort air conditioning from a one-time investment point of view, .the latter is indeed the former 4-5 times, but long-term perspective, the former in all aspects of the latter have the advantage of not more than. like, the following terms to describe the ten points: <BR> < .BR> a precision air conditioning control system with intelligent <BR> high precision air-conditioning, also known as high-precision, high cleanliness dedicated air-conditioning machines, with precision thermostats. humidity and air filtration and other properties, its control system .uses a high intelligent micro-processing control, fast response, high accuracy, reliability, in general, the temperature can be controlled within the accuracy within ± 1 ℃, the relative. humidity can be controlled within ± 2% RH, even more special is .that it has the built-in air filter can be removed 5um particle size of dust particles above 95% (the efficiency of this filter is equivalent to junior high domestic standards in effect. level), the operation of the equipment in a clean state of .the environment among the general comfort air conditioning in the control and precision compared with the control exists a wide gap between its in humidity and air cleanliness, the general. Guiji typically do not have this feature.. <BR> <BR> Precision .and home air conditioning system is relatively tables 1-1 room for comfort air conditioning units air conditioning units and the general comparison of ordinal comparison to be generally cold air than in private air-conditioned 1 (kcal/m3) 52.2 ~ 32 sensible heat ratio .. (sensible cooling capacity / total cooling capacity%) 0.65 ~ 0.70.85 ~ 1.03 Enthalpy (kcal / kg) 3 ~ 52 ~ 2.54 control accuracy of 3 ℃ ± 1 ℃, ± 3% RH5 temperature control often do not have a humidifier .and dehumidifiers .6 air filters general filter function to filter particles of 0.2 ~ 0.5 10 ~ 300 000 7, the lower the evaporation temperature> 5 ℃ ~ 11 ℃ 8 Rows 4,6,82 evaporator 9 to 4 rows of 1.3 smaller wind. .~ 2.710 face velocity (m / s) ≤ 2.711 larger single refrigeration circuit standby dual refrigeration circuits or be able to run the hot standby 12 hours (h) 8 ~ 102413 annual operating reliability is not designed to run around the clock to run 14 winter .life of 3 .5 years 15 years 10 to control the general control computer control 15 16 control - can be local or remote monitoring of temperature and humidity, air treatment status, and various alarm <BR> Second, precision air conditioning equipment room better .suited to discharge a large number of sensible heat. <BR> program-controlled room and computer room are rooms with high fever, general fever about the 230-350W/m2 (200-300Kcal/m2/h), almost no room in .such latent heat, so the amount of production is very wet. smaller than the heat was very high, which requires a timely manner, to discharge a large number of sensible heat, wind capacity precision air conditioning, small enthalpy difference of the design is in .line with the special requirements, due to air volume, enthalpy difference is small, it. cooling energy is used primarily to remove sensible heat, and not dehumidify, heat it was about 90% of total energy, and the general air-conditioned comfort of .sensible heat energy is only 60-70% of total energy from. This shows that comfort air conditioning to remove sensible heat capacity is only about 70% of precision air conditioning, if you want to remove the sensible heat energy equal to the energy level must .be equipped with a larger air-conditioning equipment in order to meet the requirements, but with the cooling. capacity increased, decreased humidity are inevitable in order to maintain constant temperature and humidity, humidification devices must be added another, so that the conservation of energy .is very unfavorable.. <BR> <BR> Third, high-density arrangement of the room air volume for air conditioning and ventilation requirements proposed <BR> number of program-controlled room and general computer room much heat per unit volume ., with the continuous progress of science and technology,. the growing convergence of a variety of sophisticated electronic equipment smaller, close all kinds of electronic components arranged on the cooling effect of the increasing demands put forward, step-by-step system automatically switches power .consumption of about 48-60 per million gates. kilowatts, crossbar switch automatically each million lines of about 60-72 kilowatts of power, calculated in accordance with the general arrangement of the engine room, per cubic meter of room volume heat about 26-31Kcal ./ m2 / h, program-controlled power switches about every ten thousand .40-50 kW, as a general room arrangement, heat per cubic meter of room volume is about 134-168Kcal/m2/h, automatic vertical and horizontal heat intensity is .5 times more room, in order to ensure the timely discharge of electronic components and the sensible heat. room rate of change of temperature gradient ≤ 1 ℃ / 10 min, this amount of wind on the air conditioning and ventilation cycles made strict in order to .use more current about 3 million kilocalories of energy air-conditioning, for example, as precision air-conditioning. Its air flow should be ≥ 10000m3 / h, ≥ 30 times the number of air changes / h, and the general comfort of the air .conditioning is only 6000-6500m3 / h, only 10 times the number of air changes / h, can not satisfy the requirements of the engine room ... <BR> <BR> Fourth, the reliability of precision air conditioning to meet .the characteristics of the room does not permit parking program-controlled switching equipment <BR> year 8760 hours non-stop operation and switch with the change in traffic is not busy,. Therefore, the work at full capacity year round, considering insulation, .humidity and cleanliness requirements, the general room window is not away, the engine room insulation performance of building envelope is also very good, even in winter, no heating equipment cases, also need to. cooling, thus requiring air-conditioning equipment to ensure continuous .reliable operation throughout the year, precision air-conditioning design and selection is usually based on this need double width, double inlet, forward curved blade low speed, low noise centrifugal fan, since the pad bearing on the. not less than one hundred thousand hours .of life, refrigeration system with two sets of independent, even if a failure, another can continue to work full-hermetic scroll refrigeration compressor will also be able to extend their useful life.. The general comfort air conditioning is mainly to provide a comfortable working .environment designed to the people, it is as long as five days a week, eight hours a day working state will come to meet requirements.. <BR> <BR> Fifth, the relative humidity inside the room can not be ignored < .; BR> impact of relative humidity on the room is also an important issue, the humidity is too high or too low will affect the deformation of the tape and make punch cards, high humidity can. device appears on the surface condensation and condensation, the .insulation of electrical components and equipment, normal and low humidity will produce different electrostatic potentials placed between components, which can reach tens of thousands of volts of static voltage, enough to make electrical components are. fatal injuries, the same low humidity will result in calculation .errors caused by tape-winged song, precision air conditioning and humidity control system consists of a high-resolution micro-processing controller to control, control from the past P (ratio) + I (integral). control upgrades to the P (proportional) .+ I (points) + D (differential) control, by the user to choose the electrode boiler humidifier humidifiers and far-infrared, for precise control of humidity control room to provide a reliable guarantee for the general comfort. Air conditioning in particular 3, .5 Guiji not have this humidification devices.. <BR> <BR> Six, with a precision air-conditioning filter for the room clean room environment brought <BR> PBX room and computer room, and high precision electronic equipment on the .cleanliness of the air has special requirements, the engine room. dust will affect the normal operation of the machine, dust deposited on the tape and electronic components on the cause accelerated wear and tear, but also prone to chemical corrosion of metallic materials, changes in .performance parameters of electronic components, electrical insulation, etc., as well as excessive dust. some important components may be scrapped.. To ensure the cleanliness of the air, air-conditioning system into the air within the room must be completely filtered, the .dust particle diameter 5μm, air filtration efficiency should be more than 95%, while for the particle size of 1μm at least 90% before removal. considered qualified, according to national standards, "General specification for electronic computer field" in the request, .the maximum concentration of dust particle size ≥ 0.5μm ≤ 18000 grains / liter, dust should be a non-conductive, non-corrosive.. <BR> In precision air conditioning machine, fitted with a more standard air filter, this filter can .completely meet the room requirements for air cleanliness, more practical significance is that this filter installed directly on the precision air-conditioning. the machine does not need another occupying any space, cleaning and replacement is also very convenient.. <BR> < .BR> Seven, two sets of independent cooling system to sophisticated precision air conditioning <BR> more reliable than the other big advantage of comfort air conditioning is that it has two independent cooling system, which makes the power that would otherwise require refrigeration. into .two larger devices become smaller two sets of equipment, each used precision air conditioning compressor motor power is only 5.5-7.5KW, power outage in order to ensure air conditioning equipment running without interruption, there must be oil machine as a guarantee. power, the .compressor motor power decreases, the oil unit of power smooth start when the compressor is very favorable characteristics for the air conditioning can not be interrupted, reducing the possibility of air-conditioning down, because even if a system fails, another system can continue to. .work, In addition, the precision air conditioning of the electrical control and air circulation part as two separate units, carrying out routine maintenance and overhaul, do not need to stop the air conditioning unit, thus ensuring constant air-conditioned room, air flow and .relatively stable. the temperature gradient.. <BR> <BR> Eight, precision air conditioning has a unique way of <BR> precision air conditioning and comfort air conditioning is one of the most important difference: the design of precision air .conditioning of all the equipment to be in a high-quality. environmental conditions, while the comfort of air conditioning just to consider improving the working and living conditions of people, precision air conditioning for such a request, the way in the air than on the .air conditioning is often used to send the side way back in the air ****., but also chose to send on the next time and send back to the air **** under way, this way of precision air conditioning rack placed .on top of anti-static raised floor, the floor space for the air plenum chamber,. According to the same principle of static pressure, increasing the uniformity of air flow, this approach also enables the cold precision air conditioning sent directly from the bottom up .to the cooling rack in the program-controlled electronic devices.. Then back to the upper back air conditioning outlet, so full of electronic equipment cooling, and running to play the greatest efficiency.. <BR> <BR> Nine, precision .air conditioning of the networking capabilities enable us to control automation, intelligent step forward in terms of <BR> With the continuous development of modern science and technology, automatic control of air conditioners and also made intelligent. higher requirements, precision air conditioning systems conform .to the tide of the times to develop a very practical networking software that enables the central computer through the twisted-pair shielded cable, telephone network and modem will be distributed in different rooms within the building, different floor air-conditioning. and long-distance .distributed in all regions of the city linked to air conditioning, the implementation of centralized control.. Typically, the computer's output is a digital signal, through the Modem converting digital signals to analog signals and transmitted through the public telephone network, the remote sites also .need to configure a Modem to the analog signal into digital signal, communication, and its. main features of the system is used to display vivid charts and operation simple and easy to access with the user interface makes the system very well, the active site connected .to the alarm occurred, report to the central computer, and auto print function, through networking,. can improve the management and control level, promptly found some problems, especially in remote mountainous areas and unattended machine station showed the great superiority.. < .BR> <BR> Ten, the advantage of operating costs to more competitive <BR> precision air conditioning in the initial input precision is relatively high (mainly equipment prices), but over time, these costs. will be gradually diluted, a .year or two will be a fundamental reversal, the following example to make some quantitative analysis ...