Narrow search
Showing 81 - 90 of 284
Cover Image
Performance analysis of hybrid solar-geothermal CO2 heat pump system for residential heating
Kim, Wonseok; Choi, Jongmin; Cho, Honghyun - In: Renewable Energy 50 (2013) C, pp. 596-604
A simulation study of hybrid solar-geothermal heat pump system for residential applications using carbon dioxide was …
Persistent link: https://www.econbiz.de/10011044980
Cover Image
Performance comparison between R22 and R744 solar-geothermal hybrid heat pumps according to heat source conditions
Choi, Jongmin; Kang, Byun; Cho, Honghyun - In: Renewable Energy 71 (2014) C, pp. 414-424
Solar heat and geothermal energy are widely used renewable energy which is one of important issue for future. Besides … the R22 and R744 solar-geothermal hybrid heat pumps was investigated numerically according to heat pump operating … efficiency of solar collector in R744 solar-geothermal hybrid heat pump is 4.1% higher than that in R22 one. In addition, the …
Persistent link: https://www.econbiz.de/10011045217
Cover Image
Generic ground response functions for ground exchangers in the presence of groundwater flow
Tye-Gingras, Maxime; Gosselin, Louis - In: Renewable Energy 72 (2014) C, pp. 354-366
This paper describes a procedure for computing time-dependent ground response functions (G) of vertical ground exchangers in the presence of groundwater flow. The comprehensive methodology can account for multi-borehole fields and allows predicting accurately heat transfer over a large range of...
Persistent link: https://www.econbiz.de/10011045389
Cover Image
Numerical evaluation of the effects of groundwater flow on borehole heat exchanger arrays
Choi, Jung Chan; Park, Joonsang; Lee, Seung Rae - In: Renewable Energy 52 (2013) C, pp. 230-240
The effects of both direction and rate of groundwater flow on the performance of various types of borehole heat exchanger (BHE) arrays are examined using a two-dimensional coupled heat conduction–advection model. The heating operations were simulated over a period of 15 yrs using three types...
Persistent link: https://www.econbiz.de/10011045719
Cover Image
The use of heat pumps in solar heating in Belgium
Gillet, Andre C. - In: Renewable Energy 16 (1999) 1, pp. 647-651
On the basis of a short description of electric compression heat pump, an overview is given of the different sources and exchangers used in our projects, in Belgium, during the last two decades, namely: •— at cold source: ◦— Water loop in ground, water or even air.◦— direct expansion...
Persistent link: https://www.econbiz.de/10011045766
Cover Image
Renewable energy R & D, education and training at the Slovak Technical University
Ružinsky, M.; Smola, A.; Takács, J.; Šály, V.; … - In: Renewable Energy 9 (1996) 1, pp. 1199-1202
In this paper attention is devoted to the photovoltaic, solar-thermal and geothermal research and development, and …
Persistent link: https://www.econbiz.de/10011045817
Cover Image
An investigation on renewable energy education at the university level in Turkey
Karabulut, Abdurrahman; Gedik, Engin; Keçebaş, Ali; … - In: Renewable Energy 36 (2011) 4, pp. 1293-1297
obtained from the questionnaire revealed that education about geothermal, solar and wind energy is given at master’s level …
Persistent link: https://www.econbiz.de/10011046199
Cover Image
Dynamic numerical modeling of the usage of groundwater for cooling in north east Jordan – A geothermal case study
Al-Zyoud, S.; Rühaak, W.; Sass, I. - In: Renewable Energy 62 (2014) C, pp. 63-72
Geothermal energy has the potential to significantly contribute to the cooling of buildings. A shallow aquifer system … in north east Jordan was proven as a geothermal resource for its efficiency for cooling utilization. A numerical 3D model … was developed in order to predict the future performance of the geothermal cooling reservoir. Different possible …
Persistent link: https://www.econbiz.de/10011046392
Cover Image
Renewable energy research progress in Mexico: A review
Alemán-Nava, Gibrán S.; Casiano-Flores, Victor H.; … - In: Renewable and Sustainable Energy Reviews 32 (2014) C, pp. 140-153
in renewable energy sources (solar, wind, biomasss, hydropower and geothermal). However, the potential of this type of … country (11,603MW), while geothermal power capacity (958MW) makes Mexico to be ranked 4th in the use of this energy worldwide … de Investigaciones Electricas in geothermal energy during this period. According to the General Law for Climate Change …
Persistent link: https://www.econbiz.de/10011049261
Cover Image
A technical, economical and market review of organic Rankine cycles for the conversion of low-grade heat for power generation
Vélez, Fredy; Segovia, José J.; Martín, M. Carmen; … - In: Renewable and Sustainable Energy Reviews 16 (2012) 6, pp. 4175-4189
This paper presents an overview of the technical and economic aspects, as well as the market evolution of the Organic Rankine Cycle (ORC). This is an unconventional but very promising technology for the conversion of thermal energy, at low and medium temperatures, into electrical and/or...
Persistent link: https://www.econbiz.de/10011049416