Transactions of the Society of Heating,Air-conditioning and Sanitary Engineers of Japan

[title in Japanese]

Article type: Cover
2012 Volume 37 Issue 189 Pages Cover1-
Published: December 05, 2012
Released on J-STAGE: September 05, 2017

DOIhttps://doi.org/10.18948/shase.37.189_Cover1

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[title in Japanese]

Article type: Cover
2012 Volume 37 Issue 189 Pages Cover2-
Published: December 05, 2012
Released on J-STAGE: September 05, 2017

DOIhttps://doi.org/10.18948/shase.37.189_Cover2

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[title in Japanese]

Article type: Index
2012 Volume 37 Issue 189 Pages Toc1-
Published: December 05, 2012
Released on J-STAGE: September 05, 2017

DOIhttps://doi.org/10.18948/shase.37.189_Toc1

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[title in Japanese]

Article type: Appendix
2012 Volume 37 Issue 189 Pages App1-
Published: December 05, 2012
Released on J-STAGE: September 05, 2017

DOIhttps://doi.org/10.18948/shase.37.189_App1

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[title in Japanese]

Article type: Appendix
2012 Volume 37 Issue 189 Pages App2-
Published: December 05, 2012
Released on J-STAGE: September 05, 2017

DOIhttps://doi.org/10.18948/shase.37.189_App2

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[title in Japanese]

Article type: Appendix
2012 Volume 37 Issue 189 Pages App3-
Published: December 05, 2012
Released on J-STAGE: September 05, 2017

DOIhttps://doi.org/10.18948/shase.37.189_App3

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[title in Japanese]

Article type: Appendix
2012 Volume 37 Issue 189 Pages App4-
Published: December 05, 2012
Released on J-STAGE: September 05, 2017

DOIhttps://doi.org/10.18948/shase.37.189_App4

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[title in Japanese]

Article type: Appendix
2012 Volume 37 Issue 189 Pages App5-
Published: December 05, 2012
Released on J-STAGE: September 05, 2017

DOIhttps://doi.org/10.18948/shase.37.189_App5

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Study on outdoor air-cooling systems for data centers

Yosuke UDAGAWA, Keisuke SEKIGUCHI, Masahide YANAGI, Wataru FUKUMITSU, ...

Article type: Article
2012 Volume 37 Issue 189 Pages 1-10
Published: December 05, 2012
Released on J-STAGE: September 05, 2017

DOIhttps://doi.org/10.18948/shase.37.189_1

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The power consumption of air-conditioning systems in data centers needs to be decreased. Outdoor air-cooling systems are an effective solution for reducing the power consumption of air-conditioning systems. Various outdoor air-cooling systems are present and the power consumed by each system is studied. However, comparison of the amount of power consumed by each system is not fully performed. In this study, the reduction in the amount of power consumed by each system was compared through simulation. According to the simulation-based comparison results, the package-type air-conditioning unit with an expanded scope of low-pressure ratio control has the lowest power consumption per year.

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Research of Optimum Chiller System Configuration Searching Methods Application of the PSO (Particle Swarm Optimization) Methods for Optimum Chiller Configuration Searching Based on LCC (life cycle cost)

Noriyasu Maehara, Yoshiyuki Shimoda

Article type: Article
2012 Volume 37 Issue 189 Pages 11-20
Published: December 05, 2012
Released on J-STAGE: September 05, 2017

DOIhttps://doi.org/10.18948/shase.37.189_11

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The economic performance of a heating/cooling plant depends on the chiller system configuration. There are many types of chillers available for installation in a building heating/cooling plant such as a centrifugal turbo chiller, air source heat pump, gas fired absorption chiller and a co-generation system. However, sophisticated methods to determine the optimal chiller configuration are not available. It is essential to verify all available combinations of various chiller types (sub-dimension check) to determine the optimal chiller configuration. The authors studied methods to determine the optimal chiller configuration by using the PSO method and a hybrid method of PSO and Nelder-Mead Downhill Simplex method. The hybrid method of PSO and Nelder-Mead Downhill Simplex method can determine the optimum conditions in fewer calculations than PSO but there is no significant difference in the time required for calculations to converge. In PSO, all particles will gather at the area where the optimum points exist and the convergence of the calculation can be determined by counting the number of particles in the vicinity of the global optimum.

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Study on Ground Source Heat Pump System using Cast in Place Concrete Foundation : The possible use of shallow heat exchanger

Hisashi WAKAYAMA, Takao KATSURA, Katsunori NAGANO, Nobutaka SATO

Article type: Article
2012 Volume 37 Issue 189 Pages 21-28
Published: December 05, 2012
Released on J-STAGE: September 05, 2017

DOIhttps://doi.org/10.18948/shase.37.189_21

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A GSHP system using cast in place concrete foundation in a high school building was studied and the process including planning, design, installation and commissioning was presented along with the measured results. The GSHP system has not been applied in practice in warm areas. This report shows the possibility of high-performance operation during the summer in a warm area by the actual performance of this system. The result suggests the possibility of the GSHP system being used in warm areas. The GSHP system contains shallow 7 m depth heat exchangers. This study shows the planning summary and the possibility of practically using a shallow-type GSHP system in a warm region through the results of actual operation data analysis.

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Numerical Simulation on Weak Natural Convection Field using Dynamic LES Model Validation of LES Models and Examination of Grid Resolution

Hiroki ONO, Koji SAKAI, Ryoichi KAJIYA

Article type: Article
2012 Volume 37 Issue 189 Pages 29-38
Published: December 05, 2012
Released on J-STAGE: September 05, 2017

DOIhttps://doi.org/10.18948/shase.37.189_29

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It is important for building simulation using CFD to estimate convective heat transfer with high accuracy. However, the popular Reynolds-averaged Navier-Stokes model (RANS) is not suitable because natural convection is almost prominent near a wall. For this reason, we focused on a dynamic LES model, which is effective in a complex turbulent flow, and compared it with the measurement result obtained by Tian et al. In addition, the effect of changing the grid resolution was tested because we considered a practical calculation in designing HVAC equipment. As a result, we ensured that the dynamic LES model was highly accurate in computing the natural convection flow and convective heat transfer. Furthermore, the dynamic LES model showed less difference between measurement results than other models with low grid resolution.

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Test Method of Heat Exchange Efficiency for Mechanical Ventilation Unit with Heat Storage Alternating Intake and Exhaust Periodically

Sayaka MURATA, Akira FUKUSHIMA

Article type: Article
2012 Volume 37 Issue 189 Pages 39-46
Published: December 05, 2012
Released on J-STAGE: September 05, 2017

DOIhttps://doi.org/10.18948/shase.37.189_39

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The heat exchange efficiency of a heat exchange-type mechanical ventilation unit that alternates intake and exhaust through heat storage material cannot be calculated from the measured humidity of the supply, inside air and outside air. Because the supplied air will change every moment, the humidity sensor's response to the changes will be delayed. In this paper, we suggested a method to estimate the actual humidity by integrating repeatedly the result obtained from the sensor whose response to the humidity change is known. First, we presented a theoretical method to estimate the actual humidity. Second, the characteristic of the humidity sensor's response to the change rate was measured. Third, the humidity estimated by the theoretical method was compared to the actual humidity and the accuracy of the method was verified. Finally, measurement of the heat exchange efficiency of the mechanical ventilation unit that alternates intake and exhaust through heat storage material was attempted.

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[title in Japanese]

Article type: Appendix
2012 Volume 37 Issue 189 Pages App6-
Published: December 05, 2012
Released on J-STAGE: September 05, 2017

DOIhttps://doi.org/10.18948/shase.37.189_App6

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Study on Radiators Made of Plastic Pipes : Part 3-Estimation of Indoor Thermal Environment in a model house where the Plastic Radiator is installed

Hiroyasu SHIRATO, Kazuhiko TOMITA, Hideo HOSHINA, Tomoaki IURA

Article type: Article
2012 Volume 37 Issue 189 Pages 47-54
Published: December 05, 2012
Released on J-STAGE: September 05, 2017

DOIhttps://doi.org/10.18948/shase.37.189_47

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This paper constitutes Part 3 in the series of studies on a radiator made of plastic pipes for air conditioning. We installed the radiator for a radiation cooling and heating system in a model house and estimated the indoor thermal environment. According to the long-term measurement, the indoor thermal environment is kept comfortable. The radiation effect of the radiator is higher than that of an air conditioner during summer. Moreover, the radiation cooling system ensures a decrease in energy consumption in the case of high heat load in the house. From the concentration measurement, we confirmed that the installation of the plastic radiator gives infrequent changes in indoor temperature and low airflow.

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[title in Japanese]

Article type: Appendix
2012 Volume 37 Issue 189 Pages 55-90
Published: December 05, 2012
Released on J-STAGE: September 05, 2017

DOIhttps://doi.org/10.18948/shase.37.189_55

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[title in Japanese]

Article type: Cover
2012 Volume 37 Issue 189 Pages Cover3-
Published: December 05, 2012
Released on J-STAGE: September 05, 2017

DOIhttps://doi.org/10.18948/shase.37.189_Cover3

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