In order to ensure the quality of printed products, it is one of the important measures to install and use air conditioners in the offset printing workshop and adjust the appropriate workshop temperature. The selection and maintenance of air conditioners used in offset printing workshops are worth noting. 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 the dual-system cooling and heating type and heating capacity), the selection should be based 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 choose 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 have large and complex equipment and can be adjusted in a wide range. They are generally designed by a special design unit, and require professional installation and commissioning. operating. For a small space, usually only 1-3 workshops (workshops) such as 04, 05, and 08 offset presses are installed. Generally, a single small air conditioner or a split floor dual-system cold and warm air conditioner can be selected.
The selection of the size of the air conditioner is based on the necessary cooling capacity of the adjusted workshop, and the required cooling capacity is mainly determined by the cooling loss of the air conditioning room building envelope, based on the quality of its structure and the exposed wall area. Depending on the size. In summer, due to the high outdoor temperature, especially the sun shining on the outer wall (or roof) of the air-conditioned room, the temperature difference between the outside of the air-conditioned room (in the workshop) reaches about 10 degrees, and the outdoor air heat and solar radiation heat pass through the walls and windows The door and the like are transmitted to the room, which cancels out a part of the cooling capacity of the room. The larger the temperature difference between the room and the outside, the more heat is transferred, and the greater the cooling capacity consumed, and vice versa. These factors are one of the basis for estimating the cooling capacity of air-conditioned rooms.
As far as the heat generated by an air-conditioned room is concerned, the workshop and the family room cannot be compared. The calorific value of the living room is mainly the human body, lighting or ordinary household appliances. The calorific value in the workshop is various, including the human body, electrical equipment, lighting, and the heat generated by the electric drive equipment. Human body fever is also related to human activity. People obviously emit more heat when working in the workshop than when resting in the living room. This must also be taken into account when estimating the calorific value. And electrical equipment, lighting, motor operation, etc. should be included in the heat value according to its input power (heat equivalent per kilowatt of electricity is 860 kcal / hour).
Through the above calculation of the cooling loss of the air-conditioned room and the qualitative analysis of the calorific value, it can be known that the cooling capacity of the air-conditioned room of the same area used in the workshop air conditioner is usually greater than that of the air conditioner used in the family room. It is worth noting that the cooling capacity of this model marked in the manual of the air conditioner 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. When purchasing an air conditioner, the nominal cooling capacity can only be used as a reference data. It is best to use a negative choice. For example: the air conditioner manual indicates that the machine is suitable for a room of 18-20 square meters, then its actual use of effective space should be Choose around 15 square meters. Use this as a reference to make an estimate of the air conditioners selected in the workshop.
The installation location of the air conditioner is also very particular. If the placement is not reasonable, it will affect the air circulation, and the normal effect of cooling (heating) will not be achieved, or the temperature will be uneven. The air supply cycle of the air conditioner is a specific semi-arc, and the beginning is roughly equivalent to the shape of an electric bulb. How to make this semi-arc in the largest 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 best installed on a relatively narrow wall, and the height is preferably centered, 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 spot". The area of ​​the "dead spot" should be reduced as much as possible.
If the offset printing machine used in the workshop has a powder spraying device, the dust of the anti-sticking dust spraying agent will be distributed in the workshop all the time. The emitted dust will invade the "body" of the air conditioner, and if accumulated too much, if it is not removed in time, it will inevitably have an adverse effect on the normal operation of the air conditioner.
The maintenance content and operation method of the air conditioner are usually described in the product manual. In use, it is necessary to carefully understand and do it carefully. Here are some necessary introductions.
Removing dust and dirt inside and outside the air conditioner is an important part of maintenance. Mainly for the cleaning of the filter, the inner shell and the chassis. The filter screen 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 net will hinder air circulation, reduce the cooling effect, and increase the power consumption. Therefore, it is necessary to pay attention to the inspection and cleaning of the filter net during use. The method of cleaning the filter is: pull out the filter, first use a vacuum cleaner to remove the dust on the suspended surface, and then wash it with a soft cloth with warm water and dry it. If there is oil, you can put a little detergent in the water and wash it before putting it into the air conditioner器 使用。 Use. Avoid acid and alkali cleaning in the filter 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 the inside of the cabinet need not be cleaned frequently. During the cleaning, the dust deposits in various parts of the body can be wiped off with a vacuum cleaner and a soft cloth. Detergents can be used, but it is forbidden to clean the whole machine with water to avoid accidents. If the heat dissipation signs of the evaporator and condenser are skewed or collapsed, they can be carefully restored with tweezers to make them arranged neatly. The dust in the heat sink can be removed with a soft brush and vacuum cleaner. The entire body and base must be cleaned and dried in a ventilated place, and all the water and moisture must be removed before reinstalling the machine.
Nail grooming is an important part of women's beauty. Women who love beauty always paint their long nails with bright red nail polish. To show the charm of delicate hands. But before you beautify your nails, you should touch them up. The first is to remove the old nail polish. Dip a cotton cloth in nail polish remover and rub vigorously from the bottom of the nail to the tip several times to remove thoroughly. This can also allow the old nail polish to soak into the skin or surrounding tissues. Then use a manicure tool to trim the shape of your nails. When finished, dip your hands in soapy water to loosen the skin. Then carefully wipe your fingers and fingers with a towel, and slowly press your fingers so that your skin is close to your nails. If necessary, use cuticle clippers and tweezers to remove the insides and uneven dead skin at the root of the nail.
Base your nails before painting them. In addition to using oil or cream around the nails and at the base, apply a protective layer to the nails. Shake the nail polish before painting to make the color inside the bottle even.
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