Experts on central air conditioning

Oh, there are too many words to type, and the editor is dazzled, so I have to make another number. . . OTL

I did make a mistake before. VRF is the general term for multi-connection, which I don’t know much about. I will remember it later. Because we basically talk about digital multi-connection and VRV separately, because the principles of the two are completely different.

Out of the topic, yaoyoung, you probably don’t know much about the actual market situation of the main unit. In terms of investment per unit of cooling capacity, air-cooled module units are much more expensive than water-cooled units. We have a 600TON centrifugal unit. The machine sells for at least 1.2 million, the 105TON air-cooled single cooler costs 600,000, and the heat pump costs more than 600,000. Of course, the price is for reference only. After all, I am in technology, not sales. But roughly Almost~Which one do you think is more cost-effective=w=

As for multi-connection, what is the price for hundreds of internal units and dozens of outdoor units? You don’t have 3 million for a total cooling capacity of so much Can you take it?

In addition, if the temperature control has an error of 1 degree, can it be called accurate... I sweat like a waterfall... What about the humidity control? Do you need additional ends? Please forgive me = =b

The poster can inquire about the prices of the several units I just mentioned. The total cooling capacity must be the same, and by the way, compare the energy consumption. Although many manufacturers also steal the news, after all, the results given by the manufacturers in black and white are much more reliable than what the salesmen say. Isn't it~

By the way, friend yaoyoung, where did the data come from that the efficiency of the multi-connection exceeds 3.0 and the efficiency of the water-cooling module exceeds 5.0? I have spent so much time dealing with the Shanghai Ministry of Energy Conservation, but I have never heard of such a thing.

The configuration of the multi-split outdoor unit itself is insufficient. They should be thankful if they can reach the nominal cooling capacity at full load. It also needs to exceed level 1 energy efficiency... Of course, it is still possible for the partial load effect to exceed 3.0, but the different test conditions have no comparative value at all. The energy efficiency standards I gave are based on Daikin VRV3 samples. I don’t know where your data comes from. Even according to the test conditions of ARI working conditions, the comprehensive efficiency of the multi-split system will not reach the level of water-cooled chillers. Otherwise, why would Americans use water-cooled chillers? What else would Americans use Trane, Carrier, and York? I went for the Daikin Hitachi multi-spring~

By the way, the ARI working condition in the United States is a standard used to evaluate the effect of air conditioners under partial load. Although yaoyoung friends are not that amateur, but for It is easier for everyone to understand. Let me explain: The ARI operating condition is to take the operating conditions of the unit under the load of 100, 75, 50 and 25. According to the proportion of the actual operating time of the general air conditioner under these conditions, it is calculated by the difference. Among them, 100 load accounts for 1; 75 load accounts for 42; 50 load accounts for 45; 25 load accounts for 12. my country's energy consumption testing now also adopts this method.

In addition, the performance of the air-cooling module reaching 5.0 is simply a big joke. Let me emphasize again, before you mention energy efficiency, it is best to read the working conditions for testing energy efficiency in my country and the national energy efficiency level. You can’t even distinguish between air-cooled units and water-cooled units, standard working conditions and variable working conditions. This is It's as ridiculous as McQuay's claim that the EER is over 17. It's okay to brag, but don't brag beyond the theoretical limit.

In addition, yaoyoung said that the water-cooled air conditioner has a single energy adjustment, which is even more confusing. Most of you have never done large-scale unit design, so naturally you will not know about the truly technical designs such as series connection of the main unit upstream, full heat recovery, and ice/water storage. These all require water-cooled main units to complete. In addition, the centrifugal unit can adjust the air intake. The guide vane angle and the screw unit can adjust the compression stroke. These are much more mature control systems than the variable frequency multi-connection system. What's more, major air conditioning manufacturers are now promoting matching refrigeration machine room group control systems, including primary pump variable flow. , large temperature difference, cooling tower control, etc. This is not something that a simple multi-connected system can match.

After talking for a long time, it has little to do with the original poster’s case, so just take a look at it~=w=