Hi Ricardo,
In SharePoint 2013, every request from a client is directed to a WFE server and every response to a client is sent from a WFE server. The WFE server directs these requests to the application server, which returns the results to the front-end web server.
Project Server 2013 runs as a service application under SharePoint Server 2013.
Here is an article for your reference:
https://amjadk.wordpress.com/tag/load-balancing-service-applications-on-multiple-application-server-for-sharepoint-2010-and-2013/
Regards,
Rebecca Tu
TechNet Community Support
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