Common approaches to the simulation of Borehole Heat Exchangers (BHEs) assume heat transfer in circulating fluid and grout to be in a quasi-steady state and ignore fluctuations in fluid temperature due to transport of the fluid around the U-tube loop. Such effects have been shown to have an impact on peak temperatures and hence operation of heat pumps systems when short time scales are consider...

Abstract In this study, we investigate the thermal behaviour of nanofluids in a double-pipe heat exchanger. It is about counterflow configuration, designed to cool lubrication unit thermoelectric power plant. The subject work evaluate performances exchanger by using nanofluid based on alumina suspension comparing with deionized water. order performance studied carried out numerical experiments ...