China
Africa
Explore chapters and articles related to this topic
Municipal Water–Based Ground-Source Heat Pump Systems
Published in Vasile Minea, Heating and Cooling with Ground-Source Heat Pumps in Cold and Moderate Climates, 2022
As can be seen in Figure 9.2, a certain amount of municipal water from large water distribution mains (of which temperature is usually around 8–12°C) should pass through an intermediate heat exchanger in order to remove or add heat. The intermediate heat exchangers (preferably shell-and-tube or spiral types with no gasket seals that might leak) must be used to separate the geothermal heat pump from direct connection with the municipal water to eliminate any reasonable possibility of contamination of any kind coming from the geothermal heat pump (Ritchey 2015). The heat removed can be used as a heat source for water-to-water or water-to-air geothermal heat pump(s) to provide building space or domestic hot water heating. Inversely, if reversible geothermal heat pumps are used, the heat recovered during the building's cooling process is injected in the municipal water main via the same intermediate heat exchanger.
Sustainable Technology and Green Building
Published in P.K. Jayasree, K Balan, V Rani, Practical Civil Engineering, 2021
P.K. Jayasree, K Balan, V Rani
Low-temperature geothermal refers to the utilization of the outer crust of the earth as a thermal battery to facilitate renewable warm vitality for warming and cooling structures, and other refrigeration and mechanical employments. In this form of geothermal, a Geothermal Heat Pump and Ground-coupled warmth exchanger are utilized together to move warm energy into the earth (for cooling) and out of the earth (for warming) on a changing occasional premise. Green house potential (referred to as “GHP”) is an important sustainable innovation since it both decreases yearly energy consumption related with heating and cooling, and it likewise levels the electric interest bend dispensing with the extraordinary summer and winter crest electric supply necessities. Along these lines low temperature geothermal is turning into an expanding national need with numerous tax credit support and center as a part of the continuous development toward Net Zero Energy.
Application
Published in Andrew Braham, Sadie Casillas, Fundamentals of Sustainability in Civil Engineering, 2020
Geothermal energy is harnessed by circulation tubes within the piles and a geothermal heat pump acting as heat exchangers. Heat energy is circulated through these tubes with water or antifreeze and is either fed into the ground for cooling in the summer or withdrawn from the ground for heating during winter. This tubing generally consists of U-tube pipes which are fitted into the steel reinforcement cage within the pile, as shown in Figure 6.11. Due to the good thermal conductivity and thermal storage capacity of concrete, piles act as an ideal medium for heat absorption in the ground (Brandl, 2006). Although, Abdelaziz et al. found the thermal conductivity of the in-situ soil actually has a more significant effect on the heat exchange capacity of the energy pile, so this should be considered during design (2011). A geothermal heat pump, similar to heat pumps used in residential and commercial applications, then performs the heat exchange.
Performance evaluation of a hybrid heating system combined a groundwater source heat pump with an existing fuel oil heater for a horticultural greenhouse
Published in International Journal of Green Energy, 2022
Meili Zhou, Fei Cai, Masahisa Uenishi, Yasumasa Sekine
In order to reduce fossil fuel consumption and greenhouse gas emissions of greenhouse heating, currently developing alternatives to fossil fuels are green energy. Green energy includes solar, geothermal, wind, biomass, water, and so forth (Midilli, Dincer, and Rosen 2007). Some examples using solar energy (Fabrizio 2012; Mohanraj, Jayaraj, and Muraleedharan 2008; Sethi and Sharma 2008) or geothermal energy (Ghosal and Tiwari 2006; Jiang et al. 2019) to heat greenhouses have been reported. Geothermal heat pump technology has the characteristics of renewable, energy saving, and high efficiency, and it can effectively reduce the demand for fossil energy and reduce greenhouse gas emissions. Consequently, geothermal heat pump technology is considered as one of the effective means to achieve sustainable development (Soltani et al. 2019) and is increasingly used in agriculture, factories, residential, offices, hotel, shopping malls, stadiums, and other large buildings (Emmi et al. 2020; Emmi, Zarrella, and De Carli 2017; Emmi et al. 2015; Iba, Takano, and Hokoi 2018; Ma, Fang, and Liu 2017; Yin, Pate, and Battaglia 2019; You et al. 2015). Geothermal heat pumps mainly include ground source heat pumps and water or groundwater source heat pumps. A few researches have been performed on the application of geothermal heat pump technology in greenhouses. Luo, Xue, and Shao (2020) conducted an experimental study on the thermal economics of a groundwater source heat pump system (GWSHPS) in a greenhouse, and the results showed that the GWSHPS is thermo-economically feasible to replace the coal-fired boiler system. Chai, Ma, and Ni (2012) reported that the coefficient of performance (COP) of a GWSHPS reaches to 3.83 and 3.91, and the equivalent CO2 emissions are reduced, respectively, by 41.9% and 44.6% in two types of greenhouses compared with a coal-fired heating system. These two researches indicated that the GWSHPS can significantly save the energy and reduce the CO2 emissions of greenhouses. However, researches on the application of groundwater source heat pump (GWSHP) technology in greenhouses are still few mainly because of the limitations of local hydrogeological conditions, well drilling technology and cost, groundwater recharge, and other problems (Casasso and Sethi 2019).