Wednesday, January 5, 2011

【 Weak current College 】 cold storage design load 】


At present, about cold storage design cooling load (frozen) computing problems. Theoretical calculation of parameters select the lack of rigor, lack of unity based on reference materials. But experience estimating population almost. This is a very serious problem. Therefore, the design of the chilling cold calculation method of selection of parameters of the identification and estimation of reference and its experience with the specific conditions, how to determine the need for discussion. Cold storage design is a systems engineering, mainly involving two big blocks: one is the design of cold storage (depends on cooling load calculation); the second is the selection of equipment. This focus on the former.
In General, cold storage according to target temperature and storage temperature differences can be divided into six categories, General computing more involved three categories, namely, the target temperature of 0 ° c to-18 ° c and-25¡æ. Of course, this is intended for estimation of experience.
However, cold storage design regardless of what kind of experience estimating a certainly, namely estimation criteria. Currently the vast majority of small and medium-sized refrigerator design used in General is 100mm polyurethane Library Board, the environmental temperature of 32 ° c, generally during the proportion for purchase 5m3/t, 30% of the amount. But in the actual operation, the customer generally inform "I want to make more than most large freezer", "how many temperature hit how many degrees", sometimes even the freezer is not something that the other is completely rely on the designer's own grasp the cold store.
A lot of cold storage design units in order to ensure foolproof, the ratio of cold output completely is not a standard calculation can "match it" — and I think it was unreasonable for the customer, so bluntly, what about the price/performance ratio. I experienced such a thing: a cold storage design is matching the two sets of unit (not standby problem), then one set down in a single set of unit operation conditions, cold storage temperature should also be able to reach the preset.
Here, I give you a set amount in the cold cold storage design experience estimating reference data: cold storage unit volume heat distribution in the reference table (unit: W/m3) storage library-library (around 0 ° c) temperature (-18 ° c or so) and low temperature (-25 ° c) small library (0 ~ 10t) 1096992 small library (90 ~ 800t) 774451 estimation method, of course, will be divided into standard, for example, some are in accordance with established under cold storage height per unit area of heat load calculation, here's just one of a kind of estimation method.
Personally, I prefer to experience. Why? because in cold storage design of standard theory, covering more than 20 parameters, parameters determine itself will provide the incompleteness of the data, the actual operation of the non-standard, and geographical factors, and other conditions of uncertainty, this deviation is far from error to allow.
This discussion to address three questions: 1. experience in estimation calculation condition; 2. estimating experience under different conditions; 3. types of established experience estimating method of determining under experience values.

1 comment:

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