Customarily, the LMTD correction factor, FT, is used to screen alternative designs for a heat exchanger. Designs with unacceptably low FT values are discarded. In this paper, authors have proposed a more fundamental criterion, based on feasibility of a multipass exchanger as the only criteria, followed by economic optimization. This criterion, coupled with asymptotic energy targets, provide the...

In this paper, overall heat transfer coefficient and friction factor of water based γ-Al2O3 nanofluid in a double tube counter flow heat exchanger have been measured experimentally under turbulent flow condition. For better dispersion of γ-Al2O3 nanoparticles in distilled water, magnetic stirrer and ultrasonic vibrator (with a power of 240 kW and frequency of 35 kHz) were implemented. The stabi...

Heat exchanger merupakan alat untuk pertukaran panas dari fluida dengan suhu tinggi ke rendah. diharapkan mempunyai efektifitas yang serta memiliki nilai fouling factor di bawah batas telah ditetapkan specification sheet. Sehingga diteliti bagaimana pengaruh kecepatan aliran terhadap efektivitas heat shell and tube seberapa besar dimiliki oleh tersebut. Dari hasil penelitian didapatkan bahwa ak...

A-Type heat exchangers are used to meet required heat load with minimum duct dimensions in air-conditioning applications. This greatly reduces the air-conditioning system footprint in residential and commercial applications. The angle and tube spacing of the A-type heat exchangers should be optimized for minimum duct size and maximum heat load. However, existing air side heat transfer and press...

The work analyzes the influence of number passes in a shell and tubes condenser heat exchanger, with an inlet pressure R134a refrigerant equal to 1.2 MPa. fluid that circulates is water or water-based nanofluid fraction aluminum oxide nanoparticles (Al2O3), methodology used subdivides exchanger into three distinct regions: overheated region, saturated subcooled region. main parameters analyze t...

This study explores the endothermic dehydriding (desorption) reaction that takes place in a high-pressure metal hydride (HPMH) hydrogen storage system when hydrogen gas is released to the fuel cell. The reaction is sustained by circulating warm fluid through a heat exchanger embedded in the HPMH powder. A systematic approach to modeling the dehydriding process is presented, which is validated a...

The need for energy efficient, low cost, and reduced material solutions are encouraging HVAC&R engineers to explore new heat exchanger designs, including those using small diameter tubes and tubes with internal enhancements. Such developments thus require review and consideration for new and/or improved heat exchanger manufacturing techniques. Experimental and analytical study of a pressure exp...