Geothermal heat pump systems: Status review and comparison with other heating options

Self, S; Reddy, Bale V.; Rosen, Marc A.

doi:10.1016/j.apenergy.2012.01.048

Cited by 487 publications

(220 citation statements)

References 18 publications

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“…In the first case, a geothermal heat pump uses the ground as a heat source/sink to provide space heating and cooling. The energy and environmental advantages of this solution compared to conventional air conditioning is deeply discussed in the literature [19]. In the paper an innovative layout is proposed in order to increase the efficiency and to reduce installation costs: a heat-storage water tank of an appropriate size was included, buried just below ground level, exchanging heat independently with the geothermal side and the heat-pump side.…”

Section: Introductionmentioning

confidence: 99%

Development of Innovative Heating and Cooling Systems Using Renewable Energy Sources for Non-Residential Buildings

et al. 2013

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Industrial and commercial areas are synonymous with high energy consumption, both for heating/cooling and electric power requirements, which are in general associated to a massive use of fossil fuels producing consequent greenhouse gas emissions. Two pilot systems, co-funded by the Italian Ministry for the Environment, have been created to upgrade the heating/cooling systems of two existing buildings on the largest industrial estate in Umbria, Italy. The upgrade was specifically designed to improve the system efficiency and to cover the overall energy which needs with renewable energy resources. In both cases a solar photovoltaic plant provides the required electric power. The first system features a geothermal heat pump with an innovative layout: a heat-storage water tank, buried just below ground level, allows a significant reduction of the geothermal unit size, hence requiring fewer and/or shorter boreholes (up to 60%-70%). In the other system a biomass boiler is coupled with an absorption chiller machine, controlling the indoor air temperature in both summer and winter. In this case, lower electricity consumption, if compared to an electric compression chiller, is obtained. The first results of the monitoring of summer cooling are presented and an evaluation of the performance of the two pilot systems is given.

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Section: Introductionmentioning

confidence: 99%

Development of Innovative Heating and Cooling Systems Using Renewable Energy Sources for Non-Residential Buildings

et al. 2013

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“…BHEs also provide economical and environmental benefits, compared to other heating systems (e.g. air source heat pumps, electric heaters, oil or natural gas boilers) [5][6][7]. However, they typically have higher installation cost which can result in long payback periods (typically until 20 years).…”

Section: Introductionmentioning

confidence: 99%

Effect of undisturbed ground temperature on the design of closed-loop geothermal systems: A case study in a semi-urban environment

et al. 2017

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This paper presents temperature measurements in four Borehole Heat Exchangers (BHEs), equipped with fiber optics and located in a semi-urban environment (campus of the University of Liege, Belgium). A 3D numerical model is also presented to simulate the heat loss from the surrounding structures into the subsurface. The mean undisturbed ground temperature was estimated from data during the preliminary phase of a thermal response test (water circulation in the pipe loops), as well as from borehole logging measurements. The measurements during water circulation can significantly overestimate the ground temperature (up to 1.7 °C in this case study) for high ambient air temperature during the test, resulting in an overestimation of the maximum extracted power and of the heat pump coefficient of performance (COP). To limit the error in the COP and the extracted power to less than 5%, the error in the undisturbed temperature estimation should not exceed ±1.5 °C and ±0.6 °C respectively. In urbanised areas, configurations of short BHEs (length < 40 m) could be economically advantageous (decreased installation and operation costs) compared to long BHEs, especially for temperature gradient lower than -0.05 °C/m.

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“…Calculations in this regard were made using the ArCaDiA-TERMO 6.6 computer program for the data compiled in Table 1. In order to determine the amount of energy that can be saved by equipping the hot water system with a vertical heat exchanger, the model presented in publication [12] is used, according to which the daily amount of energy saved is calculated using formula (1): (1) where: -the volume of shower water consumed per day [dm 3 The water temperature rise can be determined using the formula (2): The LCC (Life Cycle Cost) method was used to determine the financial performance of selected variants providing hot usable water to a detached house using DWHR supply system. This concept takes into account the total life cycle cost of a product /premises/system and the cost of purchasing, owning, using, maintaining, disposing or utilization, etc.…”

Section: Methodsmentioning

confidence: 99%

“…This fact makes current alternatives to the saving of water and the energy required to heat it. For this purpose, most installations use renewable energy sources, which is the subject of numerous publications [1,2,3]. On the other hand, the recovery of waste heat from gray water, especially in Poland, is very rarely used, although more and more frequently appearing publications point to the desirability of using this precipitation source to generate energy in both single-family (detached) [4,5] and multifamily buildings [6,7].…”

Section: Introductionmentioning

confidence: 99%

Possibility of heat recovery from gray water in residential building

Mazur

Słyś

2017

Selected Scientific Papers - Journal of Civil Engineering

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Recovery of waste heat from gray water can be an interesting alternative to other energy saving systems in a building, including alternative energy sources. Mainly, due to a number of advantages including independence from weather conditions, small investment outlay, lack of user support, or a slight interference with the installation system. The purpose of this article is to present the financial effectiveness of installations which provide hot, usable water to a detached house, using a Drain Water Heat Recovery (DWHR) system depending on the number of system users and the various combinations of bathing time in the shower, which has an influence on the daily warm water demand in each of the considered options. The economic analysis of the adopted installation variants is based on the Life Cycle Cost (LCC) method, which is characterized by the fact that it also includes the operating costs in addition to the capital expenditure during the entire analysis period. For each case, the necessary devices were selected and the cost of their installation was estimated.

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Geothermal heat pump systems: Status review and comparison with other heating options

Cited by 487 publications

References 18 publications

Development of Innovative Heating and Cooling Systems Using Renewable Energy Sources for Non-Residential Buildings

Development of Innovative Heating and Cooling Systems Using Renewable Energy Sources for Non-Residential Buildings

Effect of undisturbed ground temperature on the design of closed-loop geothermal systems: A case study in a semi-urban environment

Possibility of heat recovery from gray water in residential building

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