The chilled water cooling metering system

Overview

 With the increase of large buildings and modern buildings, the cooling system has been developed at a high speed, and the need for cooling capacity in industry and other industries has also promoted the development of centralized cooling industry. Centralized cooling is the power plant cooling media (usually fresh water and salt water) to refrigerate the refrigerator to users. In order to manage and calculate the operation of refrigeration equipment and settle the  cold consumption of users, it is necessary to calculate the cooling capacity of relevant nodes.

Cold water is measured in the same way that hot water is measured in terms of heat.Just because the fluid temperature is low, there are some differences in practice.

Installation diagram of chilled water cooling metering system

Air-conditioning refrigerated water, water temperature generally 5-6 ℃, cold media for fresh water. For cooling below 5 ℃, use brine or other cold media. The chilling metering method of fresh water chilled water is based on mass flow as shown in the figure below.

(1)In the flow measurement of chilled water, LD type electromagnetic flowmeter has obvious advantages, which are as follows:

◆Electromagnetic Flowmeter measurements are not affected by changes in fluid density, viscosity, temperature, pressure and conductivity.

◆Electromagnetic Flowmeter measurement tube flow without hindrance, no pressure loss, straight pipe section requirements are low.

◆Electromagnetic Flowmeter sensor can be grounded with electrode to achieve good grounding instrument.

◆Electromagnetic flowmeter sensor adopts advanced processing technology, the instrument has a good ability to resist negative pressure (1) the lining of LD type series electromagnetic flowmeter selection: if chilled water is fresh water, can choose rubber lining, lower cost, if chilled water for salt water, must choose ptfe lining, if the fresh water freezing water and salt water, you must choose ptfe lining, south point instrument production of LD type electromagnetic flowmeter can according to the scene of the situation, choose the right lining material.

②In the selection of thermal resistance, the south control instrument adopts high quality, high precision A class armor thermal resistance, the precision can reach ±0.2, greatly improve the accuracy of the system, the thermal resistance junction box is waterproof and moisture-proof, and the service life is long.

③XSR series aimed at the scene, such as temperature, flow heat totalizer.especially various signal acquisition, display, control, remote transmission, communication, printing, such as processing, a digital acquisition system and control system, applicable to the heat conduction oil boiler, plumbing and heating system and heat exchange system, the cold air conditioning heat and unit, building, and heat transfer station and the heat metering heating company website, the heat transfer, mass transfer to realize online measurement, thus for enterprise energy management, energy metering, which provides the basis for technical and economic.

(2)In addition to electromagnetic Flowmeter measurement, TUF series ultrasonic Flowmeter can also be used to measure, the customer can choose according to the field situation, the installation diagram of the ultrasonic Flowmeter thermal energy metering system is as follows.

①The TUF series ultrasonic Flowmeter adopts the international standard calculation formula of enthalpy value (enthalpy difference method) to realize the measurement of cold quantity / heat quantity. In order to meet the needs of users under different working conditions, it can be divided into one type and separate type. Applicable to air conditioning cooling heat and units, buildings and heat transfer stations and heating company website heat measurement and so on.