Experimental investigation of a new-style double-tube heat exchanger for heating crude oil using solar hot water

The paper presents the results of an experimental study of shell-side heat transfer and flow resistance performance of multi-tube type of double-tube heat exchanger units, which are a RODbaffle heat exchanger with smooth or roughen tubes and a segmental baffled one with smooth tubes, using water and crude oil (a mixture of oil and water) as working fluids. The experimental results indicate that the RODbaffle multi-tube type of double-tube heat exchanger with a spiral groove tube bundle provides superior shell-side heat transfer and pressure drop characteristics. Practical new RODbaffle multi-tube type of double-tube heat exchanger is installed for heating crude oil in a solar energy system.