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Davao, Philippines

Enteria N.,Enteria Grun Energietechnik | Yoshino H.,Architectural Institute of Japan | Takaki R.,Akita Prefectural University | Mochida A.,Tohoku University | And 4 more authors.
Solar Energy | Year: 2014

The new energy policy in Japan is implemented by renewable energy resources which are given a large slice of the total for their contribution to energy sources. In addition, there is a government plan to minimize, if not to eliminate nuclear power sources. Building sector energy consumption is increasing every year, hence, utilization and development of alternative energy sources and technologies to support the requirements of every house are important. Numerical performance evaluation of the alternative energy and technologies supported single family detached house was conducted in a transient system simulation (TRNSYS) program to evaluate its performance and energy requirements, and to test the cases for a possible upgrade to an energy generating house. The evaluation of the house performance is compared for possible application to the situation in different areas of Japan. 82.6% of the total primary energy supply could be supported by renewable energy sources - solar energy and biomass fueled auxiliary heater. 69.7% of the consumed energy is electricity; grid line electricity is still needed in the present installed photovoltaic roof tiles of the house. Solar energy collection can support up to 26% of the primary thermal energy requirement of the single family detached house. The remaining 70% should be supported by the back-up water heater of which fuel can be sourced from different sources such as biomass, kerosene, etc. In general, making a house yield higher thermal performance by employing energy conservation measures (ECM) coupled with the utilization of different alternative energy sources readily available in the house's vicinity has an impact on the reduction of the house's energy consumption. In addition, application of new technologies which could be supported by different energy sources has an impact on the diverse utilization of the available energy sources in the house's vicinity. © 2014 Elsevier Ltd.


Enteria N.,Enteria Grun Energietechnik | Enteria N.,Tohoku University | Yoshino H.,Tohoku University | Mochida A.,Tohoku University
Renewable and Sustainable Energy Reviews | Year: 2013

A large percentage of building energy consumption is for the maintenance of indoor thermal comfort conditions in different climatic conditions, particularly in hot and humid climates. Typical heating, ventilating and air-conditioning systems present an expensive source of energy or electric energy consumption. However, these processes have possible alternatives, materials and energy sources that are more economical and environmental friendly to support the building's indoor thermal environment. The application of hydrophilic liquid desiccant materials or absorbents can potentially support the maintenance of a comfortable and healthy indoor environment by controlling the air temperature, humidity and air quality. Many absorbent materials are being developed, tested and applied for absorbent-based heating, ventilating and air-conditioning systems. The design of these systems depends on the application and situation. Hence, the systems installed in actual buildings in different climates show their applicability and viability. Because buildings today require an increasing amount of energy for heating, ventilating and air-conditioning, the application of absorbent-based heating, ventilating and air-conditioning systems presents a potential alternative to costly traditional systems. These absorbent-based systems can lessen the building's energy consumption for the maintenance of its indoor environment. These systems also eliminate chemical contents in the air, such as VOCs, and biological microorganisms, such as bacteria and viruses. Hence, absorbent-based air handling systems are a potential alternative to typical air handling systems. These systems have several advantages: they are cheaper, smaller, require simpler maintenance and can operate on available energy sources. Therefore, further research and studies are needed to address the above issues and simultaneously educate the public (ordinary users) and developing countries on the benefits and advantages of using absorbent-based air-conditioning systems as alternatives to the widely used and established systems. © 2013 Elsevier Ltd.


Enteria N.,Enteria Grun Energietechnik | Enteria N.,Tohoku University | Yoshino H.,Tohoku University | Takaki R.,Akita Prefectural University | And 3 more authors.
International Journal of Refrigeration | Year: 2013

The developed desiccant-evaporative air-conditioning system was evaluated using the exergetic method under controlled environmental conditions to determine the performances of the whole system and its components. Percentage contributions of exergy destruction of system components at different regeneration temperatures and reference temperatures were determined. Exergy destruction coefficient of different components at different regeneration and reference temperatures were presented. It was shown that exergetic performances varied with respect to the regeneration and reference temperatures. The exergetic performances based on thermal, electric, total exergy input, first definition and second definition efficiencies were shown. Based on the results, reference and regeneration temperatures affected the determination of the system performances and its components. It was shown that air-heating coil, air fans and desiccant wheel contributed to large percentage of exergy destruction. Hence, the mentioned components should be given attention for further improvement of the system performances. © 2013 Elsevier Ltd and IIR. All rights reserved.


Enteria N.,Enteria Grun Energietechnik | Awbi H.,University of Reading | Yoshino H.,Architectural Institute of Japan
International Journal of Energy and Environmental Engineering | Year: 2015

The Philippine residential sector consumes a large percentage of the country’s generated electricity, and the price of electricity there is one of the highest in Asia. With a government program in renewable energy utilization and energy efficiency, the development of energy efficient houses is important. This paper presents a numerical investigation on how to minimize the house’s energy consumption, and the results show that a house’s electricity consumption can be supported by the installation of solar photovoltaic panels on its rooftop. A solar thermal collector with an auxiliary biomass water heater could support the hot water requirement of the house. The desiccant dehumidification system combined with evaporative and ground cooling systems can keep the house’s indoor temperature below 27 °C with a humidity ratio of less than 11 g/kg year-round. Energy conservation measures such as additional insulation of a concrete house, unplugging of un-used electrical appliances and application of light-emitting diode lighting are important to reduce electric energy consumption. The application of new building technologies is having a positive impact on a building’s energy consumption and indoor environment conditions. The results of this study are important for the Philippine program in alternative energy utilization and energy efficiency. © 2015, The Author(s).


Enteria N.,Enteria Grun Energietechnik | Enteria N.,Tohoku University | Enteria N.,Japan Building Research Institute | Yoshino H.,Tohoku University | And 4 more authors.
International Journal of Refrigeration | Year: 2015

This paper presented the exergoeconomic evaluation of the developed desiccant-evaporative air-conditioning system. The developed system was evaluated based on the steady-state conditions at different regeneration and reference temperatures. The exergoeconomic evaluation method was implemented to the system components and the whole system to evaluate the exergy efficiency, exergy destruction ratios, cost rates, relative cost differences and exergoeconomic factors. The regeneration and reference temperatures affected the exergy efficiencies, exergy destruction ratios, cost rates, relative cost differences and exergoeconomic factors. The desiccant wheel, heating coil and evaporative cooler had a high cost rate (investment cost, operation and maintenance cost, and exergy destruction cost). The exit air fan, outdoor air fan and evaporative cooler had a high relative cost difference. The exit air fan, outdoor air fan and secondary heat exchanger had a high exergoeconomic factor. Replacement of the desiccant wheel with a higher dehumidification performance could decrease the high cost rate. A higher efficiency evaporative cooler and heating coil were needed. Cheaper air fans (outdoor air fans and exit air fans) were needed. © 2014 Elsevier Ltd and IIR. All rights reserved.

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