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Heatflow Essay

1758 Words8 Pages

Chapter (2)
Literature Review

2.1 Introduction

Presently, heat pipe heat exchangers have many applications in space industries, electronics, etc. One of their important applications is in Heating, Ventilation and Air conditioning (HVAC) systems. The aim of HVAC systems is to prepare a desirable ambient air with suitable temperature, humidity, freshness and velocity. The optimal values of these variables are varied depending on the objective of air conditioning. For example, comfort conditions for human are 22 to 25°C and 40 to 60% of relative humidity (ASHRAE, 1989) [2]. One of the most interesting functions of HPHEs is to increase the dehumidification capacity of the conventional air conditioning systems.

In a conventional air conditioning …show more content…

Experimental results showed that for a heat recovery efficiency of 50% and stack flow velocity of 0.5 m/s, the pressure loss across an existing type of heat pipe was about 1 Pascal. A computational fluid dynamic simulation was used for the investigation of pressure and flow loss that caused by the HPHX. Simulation outcomes showed that the heat pipes located at the bottom of the stack produced greater insertion flow loss than those located at the top. Moreover, it was observed that the temperature of heat pipe has a small effect on the flow loss performance of the heat exchangers.
Martinez et al. [7] (2003) designed a mixed energy recovery system consisting of two heat pipes and indirect evaporative recuperates for air conditioning. The energy characterization of the mixed energy recovery system was performed by means of the experimental design techniques. As a main result, it was found that by application of the mixed energy recovery system in the air– air conditioning installations consisting of two heat pipes and indirect evaporative systems, part of the energy from the return air flow could be recovered, thus improving energy efficiency and reducing environmental

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