SU1710928A1 - Method for determination of energy losses in linear section of heat-supply line - Google Patents

Abstract

The invention can be used in energy. The purpose of the invention is to improve the accuracy of definitions, efficiency and efficiency. For this purpose, thermal aerial survey is preliminarily performed and the heat conductor section under study is divided into zones with the same intensity of thermal luminescence. In these zones, temperature contrasts are measured on the surface of the earth above the heat conductor along the section profile, the temperature and flow rate of the heat transfer medium in the heat conduit pipes are measured at the site boundaries, and the energy losses in each allocated zone of the heat conductor portion are determined from the data obtained.

Description

The invention relates to energy.

The aim of the invention is to improve the accuracy of determining the magnitude of energy losses and the efficiency of measurements and calculations.

The goal is achieved in that according to the method of measuring temperature contrasts on the surface of the earth above the heat conductor along the section profile, thermal aerial surveys of the heat conductor section are preliminarily carried out with unchanged laying conditions (design, laying depth, soil type, character of the earth's surface) These sections of the heat pipe are divided into zones with the same intensity of thermal luminescence.

In the middle of each zone allocated in the considered section of the heat conductor, the sum of the temperature contrasts on the surface of the earth is determined along the profile intersecting the heat conductor;

less than 5 m on both sides of the heat conductor axis. The temperature contrasts are summed over each profile with the same pitch.

At the boundaries of the considered section, the flow rate and temperature of the heat transfer medium in the heat conduit pipes are measured;

The total energy loss throughout the heat conductor is

Qo 2 CjATj / ajDj.

dGo Qo - energy losses in the length of the entire heat pipeline section. W;

N is the number of pipes in the heat pipe;

Cj is the specific heat capacity of the coolant in the Jth tube, J / kg K;

DT is the temperature difference of the coolant at the boundaries of the site in the J-th pipe, K;

pi is the density of the coolant in the jth pipe, kg / m3;

s

AND

eight

ABOUT

00

J

m-vc.

Dj is the flow rate of the coolant in the jth pipe,

0)

On the other hand, using the formula

RDH

k t

Zk-Duk

where M is the total number of zones of equal intensity of thermal luminescence throughout the considered portion of the heat conductor;

5k is the sum of the temperature contrasts along the secant profile in the middle of the Kth zone, K; A At the length of the K-th zone of the heat pipe, m.

Then the energy losses in the zone of the considered section of the heating main per unit of its length are determined by the following expression

 QO

m RDH Ј Zk-Duk

K 1

PAx-S

or finally

The amount of + oh does not exceed 6%. which determines a significant gain in accuracy.

Claims (1)

Formula image shadow The method of determining the energy losses in the zone of the linear portion of a heat conductor with uniform conditions for its initiation, including the measurement of temperature contrasts on the surface of the earth over the conduit along the intersecting profile by thermal aerial survey of the portion of the heat conductor, so that the purpose of improving accuracy, efficiency and the efficiency of determining the magnitude of energy losses, according to the thermal aerial survey, break up a section of a heat pipe into zones with the same intensity of heat, in the middle of each zone determine the sum of temperature contrasts on the surface of the earth along a profile that intersects the heating main, measure the temperature and flow rate in the heat pipe and determine the amount of energy loss for each zone by the formula N 2 s, dt, oh, J i S, to 1 Zk-Duk where Q is the amount of energy loss per unit length of the heat pipe in the zone under consideration, W / m; S is the sum of temperature contrasts along the secant profile, K; The relative error in determining the energy loss by the proposed method 3q is OQ from + OS where σ is the relative error in measuring the temperature of the heat transfer medium in the heating pipe; ob is the relative error in measuring the flow rate of the heat carrier in the pipes of the heat conductor; os is the relative error in measuring the sum of temperature contrasts. Editor V. Bugrenkova where Q is the energy loss per unit length of the heat conductor, W / m; С} - specific heat capacity of heat transfer fluids in the Jth pipe, J / kg K; N is the number of pipes in the heat pipe; DT) is the temperature difference of the coolant in the j-th pipe at the boundaries of the site. TO; / 3j is the density of the coolant in the jth pipe, kg / m3; D) - flow rate in the} th pipe, m3 / s; M is the total number of zones of equal intensity of thermal luminescence throughout the entire heat conductor section; Zk is the sum of the temperature contrasts along the profile that cuts the heat line in the middle of the Kth Zone. TO; S is the same for the definable zone, K; D UK - the length of the K-th zone. m. Compiled by I. Peto n Techred M. Morgental Corrector A. Osaulenkr 35 40 45 50 Q | C, AT, d 0 ,. i  Zk-Duk to t 3,