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Boiler Operator's Handbook
Published in Carl Bozzuto, Boiler Operator's Handbook, 2021
A ground source heat pump is a big investment. If sufficient space is available for installation, it would provide a good return on the investment. The reason is rather Figure 5-31. Residential heat pump. er simple. Knowing the refrigeration cycle, a significantdifference can be seen between the typical air to air heat pump in a residence and a ground source heat pump. Instead of heating the house with refrigerant boiling from heat in air at temperatures as low as 5°F, it is heated with refrigerant heated by the ground at an average temperature of 55°F. That defrost cycle is not required. As for cooling, instead of condensing refrigerant with air temperatures of 90°F or more, condensing heat is dumped to the ground at that same 55°F. Lower temperature differentials with heat pumps reduce the pressure differential that the compressor has to overcome, reducing power consumption and electricity costs. Most residential ground source heat pumps are also used to heat or at least preheat the domestic hot water.
Refrigeration and Air Conditioning
Published in Kenneth E. Heselton, Boiler Operator’s Handbook, 2020
I would love to be able to afford a ground source heat pump for my house but my lot is so small that there’s not enough room to do it. A ground source heat pump is also a big investment which I would gladly pay because it would provide a good return on the investment. The reason is rather simple. Knowing the refrigeration cycle you can see a significant difference between the typical air to air heat pump in a residence and a ground source heat pump. Instead of heating the house with refrigerant boiling from heat in air at temperatures as low as 5°F you heat it with refrigerant heated by the ground at an average temperature of 55°F. That defrost cycle isn’t required. As for cooling, instead of condensing refrigerant with air temperatures of 90°F or more you’re condensing it by dumping heat to the ground at that same 55°F. Lower temperature differentials with heat pumps reduce the pressure differential the compressor has to overcome with lower power consumption and electricity costs. Most residential ground source heat pumps are also used to heat or at least preheat the domestic hot water.
Heating, Ventilating and Air Conditioning Systems
Published in Stephen A. Roosa, Steve Doty, Wayne C. Turner, Energy Management Handbook, 2020
A ground-source heat pump uses the ground (or in some cases groundwater) as the heat source for winter heating operation and as the heat sink for summer cooling operation. Ground-source heat pumps may be subject to higher temperature fluctuations than conventional water-source heat pumps. Consequently, most manufacturers have developed extended-range systems. The extended-range systems operate more efficiently while subject to the extended-temperature range of the water loop. Like water-source heat pumps, ground-source heat pumps use a water loop between the heat pumps and the heat source/heat sink (the earth).
An analytical heat-transfer model for coaxial borehole heat exchanger with segmented method
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2020
Xianwen Huang, Zhishu Yao, Haibing Cai, Weipei Xue, Xuesong Wang
With the development of urbanization and the improvement of human life quality, the demand for building energy continues to increase. (S. 2019) Although the use of fossil fuels can temporarily meet the demand for building energy, its reserves are limited, and its impact on the environment is huge, which is contrary to the goal of sustainable development (Luo et al. 2019). Therefore, for reducing dependence on fossil fuels and protecting the environment, the use of building energy is developing toward a diversified and sustainable direction, such as wind (Wu, Wang, and Wu 2020), geothermal energy (Kaygusuz and Kaygusuz 2010). Compared with other energy types, geothermal energy is relatively stable, and not easily affected by seasonal and other external factors (Aresti, Christodoulides, and Florides 2018). Ground source heat pumps (GSHPs)(Luo et al. 2016) are a typical application of geothermal-energy utilization. It applies uniform underground temperature on cooling or heating for buildings, and has been applied in many countries, such as Australia (Lu et al. 2017) and China (Ma, Kim, and Hao 2019), maintaining an annual growth rate of 10–30% (Cui et al. 2018). Compared with the traditional air-conditioning systems, the heat-exchange efficiency of ground source heat pumps 2 to 5 times higher (Javadi et al. 2019), which has better economic and environmental benefits.
Modelling of a water-to-air variable capacity ground-source heat pump
Published in Journal of Building Performance Simulation, 2018
Samuel Bouheret, Michel Bernier
Ground-source heat pumps can provide space conditioning and domestic hot water (DHW) with a high level of energy efficiency (Simon et al. 2016). Since most of them are sized to meet the annual peak building loads, they need to operate at partial capacity most of the time. The most common way of varying the capacity is with intermittent heat pump operation. The duration of the off period is adjusted so that, on average, the heat pump capacity is equal to the load. Variable capacity ground-source heat pumps, however, can provide a variable output which leads to more stable space temperatures and reduced cycling losses associated with part load operation. Furthermore, some have two reversing valves which enable multiple modes of operation including the production of DHW with either the ground or the house as the heat source. These heat pumps offer significant improvements over conventional heat pumps. However, very few researchers have developed detailed models that could be used in simulation studies to quantify their energy benefits.
Review of solar assisted HVAC systems; Its performance analysis using CO2 as a refrigerant
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2019
Olusola Bamisile, Oluseyi Olagoke, Mustafa Dagbasi, Ferdinand Dika, Bonaking Okwesi
A study by Ma et al. showed that ground source heat pumps use about 30.55% less energy as compared to fossil fuel heating systems. Other studies have focused more on the performance stability, feasibility of GSHP air conditioning systems (Ma et al. 2014). (Zheng et al. 2016) focused on the cost-benefit analysis of air conditioning systems.