Showing 1 - 10 of 865
Convection is shown in earlier studies to improve the thermal contact between heat exchanger and borehole wall in water-filled boreholes. This study investigates the effect of convection on the required borehole length for a ground-coupled heat pump installation. Artificial convection was...
Persistent link: https://www.econbiz.de/10010804872
Heat pumps, as a process recirculating environmental heat back into useful heat production, fit the environmental requirements of present global policy. They are very useful tools to reduce the need of fossil fuels in space heating and cooling. The government of the Republic of Korea has...
Persistent link: https://www.econbiz.de/10011055801
This study is concerned with U.S. geothermal resources, their potential for commercial utilization by electric utilities between now and the year 2000, and their impact on the utility industry. USGS estimates of the resources in identified hydrothermal systems were extrapolated to the...
Persistent link: https://www.econbiz.de/10009436935
default technology input values--such as capital costs, operating costs, and capacity factor--from established H2A production …
Persistent link: https://www.econbiz.de/10009437264
refrigerant flow rate. Finally, COP showed lower value at the undercharged condition than that at the fully charged condition. The … slope of the capacity with a HS charge amount was much steeper at undercharged conditions than that at overcharged … conditions. For HS undercharged conditions, the heating capacity decreased greatly, because heat transfer rate from LS cycle to …
Persistent link: https://www.econbiz.de/10011208686
system and GCHP system were adopted, because the capacity of each indoor unit could be changed linearly according to the … be operated with high performance at relatively low temperature setting conditions. The system COP of the ground …
Persistent link: https://www.econbiz.de/10011045342
capacity effect and various arrangements of U-shaped tubes within boreholes. To meet this engineering challenge, this paper … account for not only the influence of the heat capacity of grouting material but also the difference between properties of …
Persistent link: https://www.econbiz.de/10010688054
This paper investigates the transient heat conduction around the buried spiral coils which could be applied in the ground-coupled heat pump systems with the pile foundation as a geothermal heat exchanger. A transient ring-coil heat source model is developed, and the explicit analytical solutions...
Persistent link: https://www.econbiz.de/10010576304
This paper presents a numerical heat transfer model for vertical U-tube Ground Heat Exchangers (GHE). This model is uniquely able to take into to account different initial soil temperatures and physical properties at different depths. The model has been validated based on an experimental case...
Persistent link: https://www.econbiz.de/10011045744
The goal of the present study is to validate the cooling performance of a ground-coupled heat pump system established in Fırat University, Elazığ (38.41°N, 39.14°E), Turkey. The cooling load of the test room was 3.1kW at design conditions. The experimental results were obtained from June to...
Persistent link: https://www.econbiz.de/10011046230