Long-term energy and exergy analysis of heat pumps with different types of ground and air heat exchangers

Habibi, Mohammad; Hakkaki-Fard, Ali

doi:10.1016/j.ijrefrig.2019.02.021

Cited by 44 publications

(11 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Equation (1) is based on heat transfer equation [10,19]. This equation can be used to calculate the heat transfer rate between ground heat exchanger and heat pump.…”

Section: Performance Calculation Equationmentioning

confidence: 99%

See 1 more Smart Citation

A Study on the Effect of Performance Factor on GSHP System through Real-Scale Experiments in Korea

et al. 2020

View full text Add to dashboard Cite

A ground source heat pump system is one of the high-efficient technologies for space heating and cooling since it uses stable underground temperature. However, in actual application, many situations cannot be achieved due to the unsuitable design of operation. In particular, the design characteristics of buildings with different building load patterns are not reflected by the conventional design method. Moreover, the design capacity of the heat pump can be reduced by designing less capacity than the peak load through the introduction of the heat storage tank, but there is no related quantitative design method. Therefore, in this study, the effect of the ground source heat pump system design factors such as shape, length of the ground heat exchanger, and the capacity of the heat storage tank on the system performance was analyzed. To quantify the effect of such factors on system performance, an experimental plant was constructed and case studies were conducted for each design factor.

show abstract

“…The Equation (1) is based on heat transfer equation [10,19]. This equation can be used to calculate the heat transfer rate between ground heat exchanger and heat pump.…”

Section: Performance Calculation Equationmentioning

confidence: 99%

“…It can be represented by the sum of heat transfer rate and heat pump power [10]. The heat pump COP can be expressed as the ratio of the heating capacity to the required power [10,19].…”

Section: Performance Calculation Equationmentioning

confidence: 99%

A Study on the Effect of Performance Factor on GSHP System through Real-Scale Experiments in Korea

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Based on the experimental results, they found that the ground effective thermal conductivity of the inner rib type has a higher 13.2% than that of the high‐density polyethylene type using water as a working fluid. Habibi and Hakkaki‐Fard 15 developed a mathematical model to find out the long‐term energy and exergy analysis of heat pump systems with different types of GHX using water and air as working fluids. The seasonal exergy destruction in the heating mode of the GSHP with the VGWHE, the GSHP with the HGWHE, the ASHP with the GAHE, and the common ASHP were 44.0%, 42.5%, 16.5%, and 15.7% lower than the cooling mode.…”

Section: Introductionmentioning

confidence: 99%

Thermal performance of water‐based brines as a heat carrier for ground heat exchanger under severely cold environments

Verma

Tarodiya

Thangavel³

et al. 2022

Heat Trans

View full text Add to dashboard Cite

The aim of the present study is to investigate the performance of water‐based brine solutions in the ground heat exchanger (GHX) for space heating applications under severely cold climate conditions. The conventional ethylene glycol (EG) and propylene glycol (PG)‐based water solutions have been considered for investigation. For the closed‐loop vertical U‐tube GHX, a mathematically built model is developed for ambient temperature below 0°C. The thermal performance analysis of GHX is carried out for the variation in fluid flow rate and brine solutions for different mixture percentages of water in EG and PG. The percentage of the mixture and fluid flow rate varied from 25% to 60% and 0.2 to 0.6 LPS, respectively. GHX performance parameters, namely convective coefficient, pressure drop, borehole resistance, and GHX effectiveness are determined for both EG and PG brines. Better performance of GHX is noticed with EG brines as compared to PG brines for similar operating conditions. The drop in convective coefficient from 22% to 44% in the case of PG brines as compared to EG brines with the increase in mixture percentage from 25% to 60%, for the same operating conditions. The pressure drops decreased from 15% to 74% for EG mixture as compared to PG mixture at considered flow rate and mixture percentage. The effectiveness and overall borehole resistance were higher for EG as compared to the PG solution.

show abstract

“…A reduction in borehole depth with no significant change in heat exchanger output is generally needed for system economy. In this point of view, many research studies have been carried out to find a way to enhance the performance of GHX 7–11 . Faizal et al 12 reported that a highly thermal conductive filler and material can also be mixed with concrete for enhancement of conductive and convective heat transfer.…”

Section: Introductionmentioning

confidence: 99%

“…In this point of view, many research studies have been carried out to find a way to enhance the performance of GHX. [7][8][9][10][11] Faizal et al 12 reported that a highly thermal conductive filler and material can also be mixed with concrete for enhancement of conductive and convective heat transfer. However, it is seen that only a small enhancement in the GHX performance with different methods was achieved.…”

Section: Introductionmentioning

confidence: 99%

A study on utilization of ground source energy for space heating using a nanofluid as a heat carrier

Tarodiya

Verma

Thangavel³

2021

Heat Trans

View full text Add to dashboard Cite

Ground source heat pump (GSHP) systems are well established as an energy‐efficient space conditioning device. However, for better utilization of the ground source, improvement in GSHP performance is desirable, which limits the small temperature difference between the ground and the circulating fluid. In this study, efforts have been made to investigate the performance of a ground heat exchanger (GHX) with a nanofluid as a heat carrier. Mathematical modeling is performed for the closed‐loop vertical U‐tube GHX with six different (Al2O3, CuO, graphite, multiwalled carbon nanotube, graphene, and Cu) water‐based nanofluids. The effect of different operating parameters on GHX length, fluid temperature, and pressure drop with nanofluids is determined. On the basis of the analytical results, it is found that the graphite particle‐based nanofluid plays a prominent role to enhance the performance of the GHX as compared with other nanoparticles. The maximum enhancement in the increase in outlet fluid temperature and reduction in pipe length with graphite particle‐based nanofluid are 68.3% and 63.3%, respectively, for an increase in temperature difference from 7°C to 15°C between the atmosphere and the ground. Also, with the graphite particle‐based nanofluid and the increase in pipe diameter from 20 to 50 mm, the fluid outlet temperature increases up to 11.2%, and the requirement in GHX length reduces up to 55%.

show abstract

Long-term energy and exergy analysis of heat pumps with different types of ground and air heat exchangers

Cited by 44 publications

References 56 publications

A Study on the Effect of Performance Factor on GSHP System through Real-Scale Experiments in Korea

A Study on the Effect of Performance Factor on GSHP System through Real-Scale Experiments in Korea

Thermal performance of water‐based brines as a heat carrier for ground heat exchanger under severely cold environments

A study on utilization of ground source energy for space heating using a nanofluid as a heat carrier

Contact Info

Product

Resources

About