Recently, there is growing demand for energy saving technologies in buildings due to global warming and environmental impact issue. As a result to this, energy-efficient technologies are becoming more popular amongst researchers and designers. In this regards, to fulfil energy conservation demands, researchers have focused on the development of advance heat or energy recovery with energy-efficient ventilation system. The aim of this paper is to review heat or energy recovery technologies for building applications. The reviews were discussed according to the concept and classification of heat or energy recovery based on types and flow arrangement. The developments of these technologies in integrated energy-efficient system such as mechanical and passive ventilation, air conditioning, dehumidification and photovoltaic panel have also been presented.

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Review on heat recovery technologies for building applications

Advancements into the computational studies have increased the development of heat pipe arrangements, displaying multiphase flow regimes and highlighting the broad scope of the respective technology for utilization in passive and active applications. The purpose of this review is to evaluate current heat pipe systems for heat recovery and renewable applications utility. Basic features and limitations are outlined and theoretical comparisons are drawn with respect to the operating temperature profiles for the reviewed industrial systems. Working fluids are compared on the basis of the figure of merit for the range of temperatures. The review established that standard tubular heat pipe systems present the largest operating temperature range in comparison to other systems and therefore offer viable potential for optimization and integration into renewable energy systems.

A review of heat pipe systems for heat recovery and renewable energy applications

Heat pipe heat exchangers and heat sinks: Opportunities, challenges, applications, analysis, and state of the art

In this paper, a comprehensive review on building applications of heat recovery systems is presented The review is given as a clear and understandable summary of the previous works The review covers detailed description of heat recovery systems with working principle and system components, current typical heat recovery technologies including the building applications, theoretical, experimental and simulation works carried out for different heat recovery technologies and findings from thermodynamic performance assessment Moreover, environmental impacts of heat recovery systems are evaluated Future scenarios for heat recovery technologies including some recommendations are also considered in the study It is concluded from the results that the heat recovery systems are very promising to mitigate the fuel consumption amounts of buildings Therefore, they can remarkably contribute in reducing greenhouse gas emissions in the atmosphere

A comprehensive review of heat recovery systems for building applications

Different heat transfer enhancers are reviewed. They are (a) fins and microfins, (b) porous media, (c) large particles suspensions, (d) nanofluids, (e) phase-change devices, (f) flexible seals, (g) flexible complex seals, (h) vortex generators, (i) protrusions, and (j) ultra high thermal conductivity composite materials. Most of heat transfer augmentation methods presented in the literature that assists fins and microfins in enhancing heat transfer are reviewed. Among these are using joint-fins, fin roots, fin networks, biconvections, permeable fins, porous fins, capsulated liquid metal fins, and helical microfins. It is found that not much agreement exists between works of the different authors regarding single phase heat transfer augmented with microfins. However, too many works having sufficient agreements have been done in the case of two phase heat transfer augmented with microfins. With respect to nanofluids, there are still many conflicts among the published works about both heat transfer enhancement levels and the corresponding mechanisms of augmentations. The reasons beyond these conflicts are reviewed. In addition, this paper describes flow and heat transfer in porous media as a well-modeled passive enhancement method. It is found that there are very few works which dealt with heat transfer enhancements using systems supported with flexible/flexible-complex seals. Eventually, many recent works related to passive augmentations of heat transfer using vortex generators, protrusions, and ultra high thermal conductivity composite material are reviewed. Finally, theoretical enhancement factors along with many heat transfer correlations are presented in this paper for each enhancer.

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Recent Advances in Heat Transfer Enhancements: A Review Report

A review on the application of horizontal heat pipe heat exchangers in air conditioning systems in the tropics

The application of heat pipe heat exchangers to improve the air quality and reduce the energy consumption of the air conditioning system in a hospital ward—A full year model simulation

An air-conditioning system performance enhancement by using heat pipe based heat recovery technology

Article History: Received: 6 Jul. 2015 Accepted: 6 Jan. 2016 Hydrodynamic performance of a marine vessel mainly depends on the frictional and pressure resistance. Pressure drag reduction could be achieved by improving the shape of the vessels with implementation of modern hull forms. Hull forms optimization techniques could also be used for this purpose. Other techniques are needed to deal with the viscous portion of the total resistance, which is mainly frictional resistance. In this paper, an extensive literature review on the different methods applied to reduce the resistance of marine vessels was made, and the advantages and disadvantages of the implemented methods were identified. The related papers were categorized into three main categories and a summary of experimental and theoretical studies was provided. On the basis of results obtained from the reviewed research studies, the combination of hull form optimization methods with other applicable drag reduction technologies such as antifouling coating is recommended to optimize the hydrodynamic forces.

A Review on the Drag Reduction Methods of the Ship Hulls for Improving the Hydrodynamic Performance

The energy conservation potential of the heat pipe based heat exchangers (HPHXs) was studied in this research. To this end, a typical climate chamber as the representative of an air conditioning system was established. The performance characteristic of a typical eight-row HPHX was obtained based on the one week operation (168 h) to determine the performance characteristic curves. The coil face velocity and inside temperature were set at 2 s m / and 24 C ∘ , respectively. Then, the relevant empirical performance equations were used to predict the energy conservation of the HPHX for the years of 2000, 2020, and 2050. The predictions showed that total amounts of 6,794 kWh, 11,278 kWh, and 14,132 kWh energy could be recovered by the fabricated HPHX in the years of 2000, 2020, and 2050, respectively.

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Mohammad Ahmadzadehtalatapeh

Papers

A review on the application of horizontal heat pipe heat exchangers in air conditioning systems in the tropics

The application of heat pipe heat exchangers to improve the air quality and reduce the energy consumption of the air conditioning system in a hospital ward—A full year model simulation

An air-conditioning system performance enhancement by using heat pipe based heat recovery technology

A Review on the Drag Reduction Methods of the Ship Hulls for Improving the Hydrodynamic Performance

Energy conservation potential of the heat pipe heat exchangers: experimental study and predictions