• Journal of the Korea Construction Safety Engineering Association
• /
• s.43
• /
• pp.48-49
• /
• 2007

• Transactions of the KSME C: Technology and Education
• /
• v.3 no.1
• /
• pp.15-21
• /
• 2015

In this paper a prediction method of GHP performance is proposed for increasing design accuracy. Two compressors with different capacity and 2311cc gas engine are used for prediction and the target capacity of GHP is 25HP. For predicting GHP performance at first the operation points are randomly selected and then as compared with compressor performance date and heat exchanger characteristic, more accurate operating points are decided through recursive calculation. Lastly engine performance date is used for calculating gas consumption volume. Predicting heating mode performance of GHP, evaporator is separated to the two section of absorbing heat in outdoor air and in engine. From the experimental results, it was found that the simulation model is good for the predicting GHP efficiency and the difference of predicted and measured efficiency is less than 5%.

• Journal of the Korean Institute of Gas
• /
• v.4 no.4 s.12
• /
• pp.13-19
• /
• 2000

Researches on unused energy are being continued because of the limited fossil fuel and the destruction of environment. Therefore this study was performed as follows The collectable amount of exhausted heat for an air-conditioning was calculated by the subway thermal environment prediction program. And the electric power needed by conventional heat source equipments was compared with one by unused heat source equipments when the exhausted heat was used by heat pump in heating and hot water supplying.

• Proceedings of the SAREK Conference
• /
• 2006.06a
• /
• pp.933-937
• /
• 2006

Energy is motive power that makes convenient society. But, our country's energy is depending on most import. Also, energy and environmental issue are important problem in community of nations. The purpose of this study is to analysis the energy consumption and environmental load of EHP and GHP in Medium and small-scaled office building. The annual energy consumption used to cooling and heating by EHP was 10 percent more than GHP. And annual energy cost of EHP was 33 percent more expensive than GHP. But, Compared to the annual $CO_2$ emission, EHP was 6 percent less than GHP. Therefore, equipment selection should be consider environmental load as well as energy consumption and cost.

• 월간 기계설비
• /
• s.102
• /
• pp.71-79
• /
• 1999

• Journal of Korean Electronics
• /
• v.26 no.6
• /
• pp.37-40
• /
• 2006

• Proceedings of the SAREK Conference
• /
• 2004.06a
• /
• pp.207-207
• /
• 2004

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.13 no.9
• /
• pp.3827-3834
• /
• 2012

Recently, instead of hot air type dryers that require a lot of heat, energy-efficient heat pump dryers have been used in various fields such as paper, textile, wood, food, etc. In this paper, the characteristics of heat pump cycle were theoretically evaluated with hot-gas bypass system to further improve the energy efficiency by minimizing the use of electric heaters in early warm-up stage of the dryers for frozen agricultural products. In addition, damper system that leads outside air to flow into the dryer were optimized to obtain extra heat for higher energy efficiency.

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
• /
• v.40 no.11
• /
• pp.46-59
• /
• 2011

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
• /
• v.43 no.8
• /
• pp.42-48
• /
• 2014