System of adjusting quantity of cold, and adjustment method for central cooling in region

Abstract

A cold regulation device in cold supplying system of local centralized type is prepared as connecting server of refrigerating station (SRS) to controller of refrigerating station (CRS) and controller of secondary cold exchanging station (CSCES) through converter, connecting multiple remote monitor computer to CRS and multiple CSCES through converter, connecting each CSCES to local monitor computer and multiple tail end controllers separately through industrial control network, carrying out cold regulation on tail device of central air-conditioning and on secondary cold exchanging station, carrying out water temperature regulation on local centralizing cold supplying network.

Description

technical field [0001] The invention relates to a central air-conditioning energy-saving control technology, in particular to a regional centralized cooling cooling capacity adjustment system and an adjustment method thereof. Background technique [0002] District centralized cooling has the advantages of improved energy efficiency, low environmental heat pollution, and can effectively reduce equipment capacity and reduce the floor area of ​​the machine room. It is being rapidly promoted and used worldwide, and has become an important aspect of the development of modern air conditioning. However, district central cooling also brings the following technical difficulties: [0003] (1) The energy efficiency ratio of the refrigeration system is reduced: the design supply and return water temperature of HVAC in conventional buildings is 7°C / 12°C, and the return water temperature of the pipe network is determined by the heat transfer characteristics of th...

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Problems solved by technology

These two control methods will make the temperature of the chilled water supply in the pipe network too low, resulting in a decrease in the efficiency of the refrigeration unit of the refrigeration station (under the premise of constant cooling capacity, the energy consumption of the main unit will increase by 2% for every 1°C decrease in the chilled water outlet temperature of the electric refrigeration unit. 3%), the energy consumption required to produce the same cooling capacity increases

(In the ice-making process of the district cooling system using ice storage technology, the efficiency of the refrigerator is much lower than that of the cooling state), so the low-temperature water supply brings about the problem of lower energy efficiency ratio of the refrigeration system;

[0004] (2) The energy consumption of the cooling water pump is large: due to the long distance of regional cooling and the large resistance of the pipe network, the power and lift of the cooling water pump are much larger than that of the conventional central air-conditioning cooling water pump. How to effectively reduce the water flow and reduce the power consumption of the pump is a One of the key issues to be solved to improve the efficiency of district cooling;

[0005] (3) The cooling capacity loss of the outdoor pipe network of the district cooling is large: because the distance of the regional centralized cooling pipe network reaches several kilometers to tens of kilometers, the large temperature difference between the low-temperature water supply pipe and the surrounding medium will cause an increase in the cooling capacity loss

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