Usually, poultry houses are located in a remote area where there is no electricity, and where there is electricity, it is expensive, so resorting to these solutions is considered important solutions to save electrical energy and provide free cooling. The main part of generated energy is consumed by cooling and heating systems. One of the well-known approaches to implemented heating and cooling system is earth to air heat exchanger (EAHE) system. This system is effective passive heating and cooling systems which can be used with poultry houses and building. This research studies numerically the effect of mass flow rate on the overall performance of earth to air HE for poultry houses. Four parameters (mass flow rate, required rate, required cooling load and pipe lengths) are selected under environment of Nasiriyah city (a city located in the south of Iraq). The study is conducted using PVC material. The study has been done during summer season. The suggested numerical model has been tested and validated using existing approaches selected from literature review papers. This test shows good agreement with results of selected papers. Moreover, validation and simulation results showed that the required cooling load increased with increasing mass flow rate. Also, with the increasing length of pipe of EAHE, the inflow temperature compared to the space temperature is decreased. However, the overall performance factor of EAHEs decreases by the increase of length of pipe and mass flow rate. Which indicate the possibility of using the earth to air heat exchanger for cooling and heating poultry houses and reduce the use of electrical energy.

This study aims to study the effect of different cooling fluids (pure fluids, Nanofluids and microencapsulated phase change materials suspensions) and the cooling performance of rectangular micro-channel heat sink. Three types of Nanofluids (Al2O3-water, Cu-water,Tio2-water), three types of microencapsulated phase change materials suspensions(MEPCM) are(RT44-water, paraffin wax water, n-octed-water ) and three pure fluids ) Water, Oil ,Ethylene Glycol ) were used with constant heat flux(100 W /cm 2 ) applied on the base of heat sink. The volumetric concentrations of Nanofluids and MEPCM suspensions (1%, 3%, and 5%) and (100 to 900) is the range of Reynolds number used in this study. The results showed that, using different types of Nanofluids and MEPCM suspensions lead to enhance the cooling performance of the micro channel heat sink (MCHS), since it lead to increase the heat transfer compared with pure fluids. The heat transfer in (MCHS) for MEPCMs is higher than that for Nanofluids. Also, the performance of heat sink increases with increase the concentration of Nanofluids and MEPCMS at certain volumetric concentration. Additionally, the pressure drop for MEPCM suspensions and Nanofluids increased compared with pure fluids.

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In the recent time the EAHE is  widely used as a passive cooling and heating technique due to the hug thermal potential of earth as and as a result of energy crisis. In the past years many researches published including studying this type of heat exchanger and using it in many applications and many locations with different  climate conditions. Also these researches investigated the most affecting parameters. In this paper a review is made to survey the published literature is this filed to shed a light on the research in this subject

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