EXPERIMENTAL AND NUMERICAL STUDY OF UNSTEADY NONPERIODIC WALL HEAT-TRANSFER UNDER STEP, RAMP AND COSINE TEMPERATURE PERTURBATIONS

被引：12

作者：

ANTONOPOULOS, KA

DEMOCRITOU, F

机构：

[1] National Technical University of Athens, Mechanical Engineering Department, Thermal Section, Athens, 106 82

来源：

INTERNATIONAL JOURNAL OF ENERGY RESEARCH | 1994年 / 18卷 / 06期

关键词：

WALL TEMPERATURE MEASUREMENTS; TEMPERATURE PERTURBATIONS; ENVIRONMENT SIMULATION;

D O I：

10.1002/er.4440180602

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

An experimental and numerical study of the transient non-periodic wall heat transfer problem is presented. A computer-controlled indoor/outdoor environment simulation system produces any desired variation of the air temperature, thus allowing measurement of the dynamic thermal behaviour of any test wall under the desired boundary conditions. Measurements of the temperature field within the wall, of the heat flow and of the convection coefficients at the wall surfaces are performed during step, ramp and cosine perturbations of the outdoor air temperature. The measurements are in very good agreement with the numerical predictions obtained by a developed finite difference solution procedure. The results showed that in building heat transfer applications, for example in air conditioning, the usual assumption of periodic outdoor conditions may lead to considerable errors in case of a significant temporary deviation of the temperature from periodicity.

引用

页码：563 / 579

页数：17

共 10 条

[1]

Antonopoulos K.A., Democritou F., (1994)

[2]

Antonopoulos K.A., Democritou F., Periodic steady‐state heat transfer in cooling panels, Int. J. Heat and Fluid Flow, 14, pp. 94-100, (1993)

[3]

Antonopoulos K.A., Democritou F., On the non‐periodic unsteady heat transfer through walls’, Int. J. Energy Research, 17, pp. 401-412, (1993)

[4]

Antonopoulos K.A., Democritou F., Correlations for the maximum transient non‐periodic indoor heat flow through 15 typical walls, Energy — The International Journal, 18, pp. 705-715, (1993)

[5]

Antonopoulos K.A., Democritou F., Vrachopoulos M., An experimental system for the transient non‐periodic thermal analysis of structural elements, Energy — The International Journal, 19, pp. 383-395, (1994)

[6]

Antonopoulos K.A., Valsamakis S., Effects of indoor and outdoor heat transfer coefficients and solar absorptance on heat flow through walls, Energy — The International Journal, 18, pp. 259-271, (1993)

[7]

(1985)

[8]

Handbook of Air Conditioning System Design, (1965)

[9]

Mitalas G.P., Stephenson D., Room thermal response factors, ASHRAE Transactions, 73, (1967)

[10]

Nilsson S., Eklund S.A., pp. 270-282, (1975)

← 1 →