Abstract
Overspray sediments deposited on the recuperator fins gradually reduce the cross-section of the recuperator channels. The result of this process is the increase in airflow resistance and thermal resistance during heat transfer. Both phenomena have a negative impact on the reliability of the device. This paper presents the concept of recuperator reliability measures. For this purpose, the essential requirement of reliability (indestructibility) was formulated and damage was defined by identifying it with the loss of air flow reserve and reserve of heat transfer efficiency. On this basis ability features of the heat recovery unit were assessed. Limits of features and critical time of recuperator loss of ability were also assessed.
Highlights
Overspray sediments deposited on the recuperator fins gradually reduce the cross-section of the recuperator channels
Fresh air taken from the outside is pre-heated in the recuperator (1) after having been cleaned in the prefilter (2) it is heated to the required temperature by a burner with a heat exchanger (3)
Operation of the recuperator in the spray booth is accompanied by the process of sedimentation of overspray particles on the recuperator fins inside warm air ducts
Summary
The following discussion assumes that the recuperator reliability is significantly affected by the process of overspray sediment deposition. It is a basic assumption which simplifies reality, neglecting other, less important processes that may lead to other forms of damage (e.g. mechanical damage). The presented influence of overspray sediments on the recuperator working parameters allows the assumption of two features determining its ability. For further analysis heat exchange efficiency reserve and air flow reserve are used. Bearing in mind the nature of the phenomenon leading to recuperator damage, in order to determine its measure of reliability, two features of ability were assumed: heat exchange efficiency reserve and pressure drop reserve
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