Estudio teórico y experimental de los parámetros de funcionamiento de un motor de combustión interna a gasolina a diferente concentración de agua-refrigerante.

Abstract

The project aims to carry out a theoretical and experimental study of the operating parameters of a gasoline internal combustion engine varying the concentration of cooling water, in order to determine the concentration at which the best evaluation of heat occurs into the coolant when runs in real operating conditions. The study begins with gathering information and acquiring items to design a data acquisition device, the system allows monitoring the temperature of the coolant by installing two thermocouples to the input and output of the engine with an extension made in LabView taking temperature measures of fluid cooler for the different concentrations which are applied to the cooling system, this system consists of a circuit which allows communication between the PC and the motor through which the data are transferred and a report is produced in the same program or in Excel. Applied a completely randomized experimental design (CRD), eleven concentrations of cooling water are formed, the same as are applied in the cooling system and cycles of handling will be developed by a certain fix path in order to obtain measurements of coolant temperature at the input and output of the engine. The statistical method used for data analysis is the analysis of variance that allows verifying if one or more treatments influence over the temperature variable and if there is an influence, quantify it. With the analysis of variance it was verified that significant difference appears between the concentrations applied to the motor because 𝐹𝑐𝑎𝑙 is greater than 𝐹𝑡𝑒𝑜𝑟. For instance, (cooling water concentrations 30-70) allows greater heat dissipation and also maintains the temperature of the engine in an optimal operating range.