On the installation and maintenance of air conditioners in offset printing workshop

In order to ensure the quality of printed products, the use of air conditioners in the offset printing shop is one of the important measures to adjust the appropriate shop temperature. For air conditioners used in offset printing shops, the selection and maintenance issues are noteworthy. To this end, briefly introduce some related issues and practical knowledge for reference.

The main performance index of the air conditioner is the cooling capacity (for dual-system heating and cooling type, there is heating capacity). The selection depends on the need, according to the size and structure of the workshop to determine the size of the air conditioner (that is, how much cooling capacity to use The air conditioner); followed by which form of air conditioner is selected to suit the conditions of use.

Large and medium-sized centralized air conditioners or segmented air conditioners are pets that are large and complex, and have a large range of adjustments. They are generally designed by specialized design units, require professional installation and commissioning, and require specialized personnel to manage and operating. For small venues, usually only 1 to 3 workshops (workshops) such as 04, 05, and 08 offset presses are installed. Generally, single-unit small air conditioners or split-floor dual-system dual-system air conditioners are generally available.

The basis for the selection of the size of the air conditioner is determined by the amount of cooling necessary for the adjusted workshop, and the required cooling capacity is mainly determined by the amount of cold loss of the air-conditioned building construction, which is based on the quality of the structure and the exposed wall area. It depends on the size. In summer, due to high outdoor temperatures, especially when the sun shines on the outer wall (or roof) of the air-conditioned room, the temperature difference in the air-conditioned room (workshop) reaches about 10 degrees, and the outdoor air heat and solar radiation heat passes through the walls and windows. Doors, etc., are transmitted to the interior to offset some of the indoor cooling capacity. The greater the temperature difference between the interior and exterior, the more heat is transferred in, and the greater the amount of cooling consumed, and vice versa. The above factors are one of the basis for estimating the cooling capacity of air-conditioned rooms.

With regard to the amount of heat that air-conditioned rooms can produce, the workshop and family room cannot be compared. The calorific value of a room is mainly human body, lighting, or ordinary household appliances. The amount of heat generated in a workshop is various, including the human body, electrical equipment, lighting, and heat generated by the electric driving equipment. The body's fever is also related to people's activity. When people work in a workshop, they emit more heat than when they take a rest in the home. This is also something that must be considered when estimating calorific value. The electrical equipment, lighting, motor operation, etc. must be calculated according to the input power (heat equivalent per kilowatt of 860 kcal/hour).

Through the above-mentioned qualitative analysis of the cold loss calculation and heat output of the air-conditioned room, it can be known that the same area of ​​the air-conditioned room is generally larger than the air-conditioner refrigeration capacity of the family room. It is worth noting that the cooling capacity of the model marked in the air conditioner manual is a quality index calculated according to certain national standards. This is only the nominal cooling capacity, and there will be large deviations in actual use. In the purchase of air conditioners, nominal cooling capacity can only be used as a reference data, it is best to use a negative selection, such as: air conditioner instructions indicate that the machine is suitable for 18-20 square meters of room, then its actual use of space should be Choose around 15 square meters. The benchmark used this as a reference to estimate the air conditioners used in the workshop.

The installation position of the air conditioner is also very particular. If it is placed irrationally, the air circulation will be affected, the normal effect of cooling (heating) will not be achieved, or the temperature will be uneven. The air circulation of the air conditioner is a specific semi-arc, and the beginning is roughly equivalent to the appearance of an electric light bulb. How to make the semi-arc placed 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, the air conditioner is preferably mounted on a relatively narrow wall surface, and the height is preferably centered so that the air circulation can be maximized. In addition, the air circulation of the air conditioner also has a certain "dead angle", and the use of the air conditioner should make the area of ​​the "dead angle" as small as possible.

If the offset press used in the workshop is equipped with a dusting device, it will be distributed in the workshop from time to time when it is used to remove the dust from the dust. Dispersed dust will invade the air conditioner “in the body”, and if it is accumulated, it will inevitably adversely affect the normal operation of the air conditioner.

The maintenance content and operation method of the air conditioner are usually described in the product specification. The use of the content should be carefully understood and carefully done. Here are some necessary introductions.

Clearing dust and dirt inside and outside the air conditioner is an important part of maintenance. Mainly for the cleaning of the filter, the cleaning of the inner shell and the 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 accumulation of dust on the filter screen can hinder the circulation of air, reduce the cooling effect, and increase the power consumption. Therefore, it is necessary to pay attention to the inspection and cleaning of the filter during use. The method of clearing the filter is: take out the filter, first use a vacuum cleaner to suck the dust on the suspended surface, then use a soft cloth to wash and dry, if there is oil, you can put a little detergent in the water before cleaning into the air conditioning Use. The filter should avoid acid and alkali cleaning to prevent deformation. In addition, evaporators, condensers, and radiators in air conditioners are also prone to dust accumulation. Keeping these parts clean is a necessary condition for the safe and efficient operation of air conditioners. However, it is worth mentioning that the internal cleaning of the chassis does not have to be carried out frequently. During the cleaning, dust and deposition of various parts of the body can be wiped off with a vacuum cleaner and a soft cloth. The detergent can be used, but it is forbidden to wash the entire machine with water to avoid accidents. Evaporator and condenser heat dissipation signs such as skew or collapse, can be carefully restored with tweezers to make it neatly arranged. The dust in the heat sink can be dusted with a soft brush and a vacuum cleaner. The entire body and stand must be wiped and dried in a ventilated area, and all moisture and moisture should be removed before reinstalling.