On the installation, selection and maintenance of

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Discussion on the installation, selection and maintenance of air conditioners in offset printing workshop

in order to ensure the quality of printing products, installing and using air conditioners in offset printing workshop and adjusting the appropriate workshop temperature is one of the important measures. For the air conditioner used in offset printing workshop, its selection and maintenance should be paid attention to. For this reason, this paper briefly introduces some related problems and practical understanding for reference

the main performance index of the air conditioner is the refrigerating capacity (for the dual system cold and warm dual-purpose type, there is also the amount of indication error affected by the friction force generated by heating). The size of the air conditioner should be determined according to the needs and the size and structure of the workshop (that is, the air conditioner with how much refrigerating capacity should be selected); The second is to choose which form of air conditioner is suitable for the use conditions

large and medium-sized centralized air conditioners or segmented air conditioners have large and complex equipment, and can be adjusted in a large range. Generally, they should be designed by a special design unit, and they also need professional personnel to install and debug, as well as special personnel to manage and operate. For workshops (workshops) where the site is small and only 1-3 offset printing machines such as type 04, 05 and 08 are usually installed, single small air conditioners or split floor dual-system air conditioners can be selected

the size of the air conditioner is determined by the necessary refrigerating capacity of the regulated workshop, which is mainly determined by the cooling loss of the building enclosure of the air conditioning room, and is determined by the quality of its structure and the area of the exposed wall. In summer, due to the high outdoor temperature, especially the sunlight shines outside the air-conditioned room 3 There is an open circuit in the electromechanical winding resistance. The wall (or roof) makes the temperature difference outside the air conditioning room (in the workshop) reach about 10 degrees. The outdoor air heat and solar radiation heat are transmitted to the room through the walls, windows and doors, offsetting part of the indoor cooling capacity. The larger the indoor and outdoor temperature difference is, the more heat is transmitted, the greater the cooling capacity is consumed, and vice versa. These factors are one of the bases for estimating the refrigerating capacity of air-conditioned rooms

in terms of the calorific value of materials produced by air-conditioned rooms, workshops and family rooms cannot be compared. The heating capacity of the room is mainly human body, lighting or ordinary household appliances. The heating capacity in the workshop is diverse, including the heat generated by human body, electrical equipment, lighting, and electric drive equipment. Human fever is also related to human activity. It is obvious that people emit more heat when working in the workshop than when resting in the room. This must also be taken into account when estimating calorific value. And electrical equipment, lighting, motor operation, etc. should be included in the calorific value according to their input power (the heat equivalent per kilowatt of electricity is 860 kcal/h).

through the above qualitative analysis of the cooling loss calculation and calorific value of the air-conditioning room, we can know that the cooling capacity of the air-conditioner used in the workshop of the same area is usually greater than that of the air-conditioner used in the family room. It is worth noting that the refrigerating capacity of this model marked in the specification of the air conditioner is a quality index calculated according to certain national standards. This is only the nominal refrigerating capacity, and there will be a large deviation in actual use. When choosing an air conditioner, the nominal refrigerating capacity can only be used as a reference data, and it is best to use a negative selection. For example, the air conditioner manual indicates that the machine is suitable for a room of 18-20 square meters, so its actual effective space should be about 15 square meters. Take this as a reference benchmark to estimate the air conditioners selected in the workshop

the installation position of the air conditioner is also very particular. If it is placed unreasonably, it will affect the air circulation. I have various answers to this question, which can not achieve the normal effect of refrigeration (heating), or cause uneven temperature. The air supply cycle of the air conditioner is a specific half arc, which is roughly equivalent to the shape of an electric bulb at the beginning. How to place this half arc in the maximum circulation space is the basic requirement for the installation and placement of the air conditioner. For example, in a rectangular air-conditioned room, it is best to install the air conditioner on a relatively narrow wall, with the height in the middle, so that the air circulation can reach the maximum use value. In addition, the air circulation of the air conditioner also has a certain "dead corner", which should be placed and used to reduce the area of the "dead corner" as much as possible

if the offset press used in the workshop has a powder spraying device, the dust of anti sticking and dirty powder spraying agent will be distributed in the workshop all the time when it is working. The dust emitted will invade the "body" of the air conditioner, and if it is not removed in time, it will inevitably have a negative impact on the normal operation of the air conditioner

the maintenance contents and operation methods of the air conditioner are usually described in the product manual, which should be carefully understood and done well in use. Here are also some necessary introductions

removing dust and dirt inside and outside the air conditioner is an important part of maintenance. Mainly for the cleaning of filtration, inner shell and chassis. The filter of the air conditioner is placed under the panel to filter the air, so it is most likely to accumulate dust. Excessive dust accumulation on the filter will hinder air circulation, reduce the refrigeration effect, and increase power consumption. Therefore, it is necessary to pay attention to the inspection and cleaning of filtration in use. The method of cleaning and filtering is: take out the filter, absorb the dust on the suspended surface with a vacuum cleaner, and then wash and wipe dry with a warm soft cloth. If there is oil stain, put a little detergent in water, and then put it into the air conditioner for use after cleaning. Avoid acid-base cleaning materials to prevent deformation. In addition, the evaporator, condenser and radiator in the air conditioner are also easy to accumulate dust. Keeping these parts clean is a necessary condition for the safe and efficient operation of the air conditioner. However, it is worth mentioning that it is not necessary to clean the inside of the chassis frequently. When cleaning, you can use a vacuum cleaner and a soft cloth to wipe away the dust deposition of all parts of the body. You can use detergent, but it is forbidden to clean the whole machine with water to avoid accidents. If the heat dissipation characteristics of evaporator and condenser are skewed or collapsed, tweezers can be used to carefully restore them to make them arranged neatly. The dust in the radiator can be removed with a soft brush and a vacuum cleaner. The whole machine body and base must be wiped and dried in a ventilated place, and the machine can be reinstalled only after all moisture and moisture are removed

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