A valuation is performed or placed on an asset to determine its financial worth (or, economic value). "The valuation determined that the car was worth $5,000." "The closing price of the stock set the company's valuation at $10 billion.".
An evaluation is an analysis of the performance of something or someone, usually against some standard of average performance of similarly situated people or things. "The auto mechanic performed a thorough evaluation of the car to determine if it could safely make the cross country trip.". "Olga's last work evaluation placed her in the top 5% of her peers."
People are always evaluated. Physical capability is always evaluated. Financial worth is determined through a valuation. We sometimes speak of placing a value on a person, but it is metaphorical. After something is evaluated, a valuation is often determined.