Experimental and analytical research of the heat transfer process in the package of perforated plates

Abstract

The need for compact heat exchangers has led to the development of many types of surfaces that enhance the rate of heat transfer, among them the perforated plate heat exchangers, also known as matrix heat exchangers. The perforated plate heat exchangers consist of a series of perforated plates that are separated by a series of spacers. The present study investigates the heat transfer characteristics of the package of perforated plates. Perforated plates were 2 mm thick, with holes with 2 mm in diameter and porosity of 25.6%. The package of one, two, and three perforated plates was set in the channel of the experimental chamber at which entrance was a thrust fan with the ability to control the flow rate. The fluid flow rates, the temperatures of the fluids at the inlet and outlet of the chamber and the temperature of the air between the plates, were measured at the predefined locations in the package and the experimental chamber. Based on the measurements, heat transfer coefficients for the individual plates, as well as for the packages of perforated plates were determined. In further research, an iterative analytical procedure for investigation of the heat transfer process and the overall heat transfer coefficient for the package of perforated plates were developed. Based on these analytical and experimental results, conclusions were drawn about the heat transfer in a package of perforated plates.

Experimental and numerical investigation of thermal and fluid-flow processes in a matrix heat exchanger

“…The air velocity and the temperature at the inlet, as well as the constant heat flux boundary conditions on the plate surface, have been set according to the experimental research results presented in the fig. 5 and earlier research results [19,23,27]. In comparison to earlier research, single plate was substituted with a package of two, or three plates.…”

“…During the experimental research the following assumptions were made [19]: -the first plate in the package of two plates acts as the first plate in the package of two or more plates, -the second plate in the package of two plates acts as the last plate in the package of two or more plates, and -the second plate in the package of three plates acts as any inner plate in the package of three or more plates. According to these assumptions the packages of one, two and three plates were formed.…”