1, refrigerator capacity. From the aspect of economic benefits, the per capita volume of 60-70 liters is more appropriate, and a family of three or so chooses 200 litres or so of refrigerators to be ideal. Of course, economic conditions are good and a large-capacity refrigerator can be selected accordingly.
2, refrigerator cooling method. Refrigerators are available in direct-cooled (frosted) and air-cooled (frosted) versions. Direct cold refrigerator preservation, good moisturizing performance, the price is relatively cheap, but easy to have frost; frost freezer freezer automatic defrost, the box body temperature is more uniform.
3, electricity. The refrigerator is not "the more power the better." Like refrigerator power, the power consumption of refrigerators is also a very important performance indicator. However, to achieve the best preservation effect, it is not enough to make a fuss about the reduction of electricity consumption. It is necessary to have an optimized structure and cooling design.
4, the degree of freezing. The degree of freezing should be practical. Refrigeration power is an important technical indicator for measuring refrigeration appliances. However, the use of refrigeration equipment varies. Compared with special needs such as commercial and scientific research, the main technical performance of household refrigerators should not be refrigeration, but should be preservation. Excessive cryogenic power will not only unnecessarily increase the amount of electricity used, but it will also destroy the organization and nutritional structure within the food. For people who pay attention to color and fragrance, preservation is the first need for consumers to buy refrigerators.
5, the pursuit of brand names is today's consumer fashion. The brand name does not mean that the price is high and the price is not necessarily advanced. In particular, mature products such as refrigerators have roughly the same manufacturing costs. The factors affecting the product price are often some soft costs, such as expenditures on advertising costs, internal management costs, and other factors. In particular, the management level of companies and the use of marketing strategies play an important role in commodity prices.
design of the villa
Achromat doublet lenses have significantly better optical performance than singlet lenses in visible imaging and laser beam manipulation applications.It consists of a positive low-index Crown Glass lens element cemented to a negative high-index Flint Glass lens element. The elements are chosen so as to cancel chromatic aberration at two well-separated wavelengths, usually in the blue and red region of the spectrum. Focal length is constant at those two wavelengths and focal length shifts are virtually eliminated across the visible wavelengths. One frequent use is to achieve diffraction limited focusing of a laser beam. Negative Achromat is typically used when there is a need to eliminate chromatic aberration. In addition to reducing chromatic aberration at the design wavelengths, spherical aberration and coma are greatly reduced. We always make our achromats as precise specifications and tolerances for uncompromising image quality upon customer's requirement.
Doublet Achromatic Lens Triplet Achromatic Lens
Specification of our achromatic lens as follow:
*Material:BK7,ZF2,ZF7(or according to your request)
*Dia.:+0/-0.05
*Center thickness tolerance:+/-0.1
*Surface quality: 60-40 Scrath/Dig
*Surface figure:0.5-0.2
*Centration < 3arc min
*Chamfer:0.1-0.25*45 degrees
*Design wavelength:486.1mm,587.6mm,656.3mm and upon request.
Achromatic Doublet Lens,Negative Optical Achromats Lens,Optical Achromatic Lens,Big Dimension Achromatic Lens
China Star Optics Technology Co.,Ltd. , https://www.opticsrealpoo.com