Transient simulation and multi-objective optimization of a VSD ground source heat pump in various usage

Kavian, Soheil; Aghanajafi, Cyrus; Dizadji, N.

doi:10.1016/j.enconman.2019.111847

Cited by 15 publications

(5 citation statements)

References 32 publications

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“…The isentropic efficiency can be modeled as the function of the pressure ratio (defined as the ratio of the condensation pressure to the evaporation pressure) [50] . For example, Kavian et al [51] and Liu et al [52] modeled that the isentropic efficiency linearly decreased with the increasing pressure ratio. Wang et al [49] modeled the isentropic efficiency as a quadratic function of the pressure ratio.…”

Section: Methodsmentioning

confidence: 99%

Integrated system of exhaust air heat pump and advanced air distribution for energy-efficient provision of outdoor air

Zhang

Yun

Lin

2022

Applied Thermal Engineering

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Section: Methodsmentioning

confidence: 99%

Integrated system of exhaust air heat pump and advanced air distribution for energy-efficient provision of outdoor air

Zhang

Yun

Lin

2022

Applied Thermal Engineering

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“…In the previous study, all the required information for simulation of a heat pump including initial conditions, fluids, and their thermodynamic properties was mentioned. 11 Accordingly, a numerical simulation of the geothermal heat pump based on lumped method and by considering the refrigerants phase-type has been conducted. 11 The details of the GSHX and ground conductivity have been shown in Appendix B.…”

Section: Heat Pump System Modelingmentioning

confidence: 99%

“…11 Accordingly, a numerical simulation of the geothermal heat pump based on lumped method and by considering the refrigerants phase-type has been conducted. 11 The details of the GSHX and ground conductivity have been shown in Appendix B. The NTU-ε method is used in calculating the total heat transfer in converters.…”

Section: Heat Pump System Modelingmentioning

confidence: 99%

“…Moreover, as heat exchangers have two different states, single-phase and two-phase, the amount of heat transfer coefficient for each state is obtained separately. 11 The assumptions for the proposed GSHP are presented as the following.…”

Section: Heat Pump System Modelingmentioning

confidence: 99%

“…25 In order to model the simulation of the mentioned system, several types of components were taken from the default TRNSYS library, whereas the performance of specific VSD heat pump models are developed in EES software and its numerical codes were verified in the previous study. 11 In addition, the U-type geothermal heat exchanger simulated in TRNSYS is based on the experimental measurements, which were assessed and applied in the Kavian et al 11 study.…”

Section: Model Validationmentioning

confidence: 99%

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Numerical simulation of geothermal‐PVT hybrid system with PCM storage tank

Kamazani

Aghanajafi

2021

Intl J of Energy Research

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As the increase in greenhouse emissions, climate changes, and other irreversible repercussions stems from environmentally destructive energies such as fossil fuels, exploiting solar and geothermal energy as unlimited clean sources of energy in the renewable energy technologies can survive the planet earth, which is facing a catastrophe on a global scale. The main purpose of this research is to study Techno analysis of the combined ground source heat pump (GSHP) and photovoltaic thermal collectors (PVTs) with a "phase-change material" (PCM) storage tank to fulfill the energy demands of a residential building. In the first step of this study, in order to model the heat pump behavior in multi-usage operation modes (heating and cooling), a numerical transient simulation of a water-to-water GSHP, which includes a vertical U-type ground source heat exchanger (GSHX) and a variable speed drive (VSD) compressor, was conducted by developing a numerical code in Engineering Equation Solver software. To study the thermodynamic aspect of the hybrid system in terms of exergy and energy, a transient numerical simulation was accomplished using the TRNSYS program. Also, the impact of effective characteristics of ingredients such as areas of PVT panels and the volume of the storage tank of PCMs on the performance of the hybrid system are investigated. On top of that, the two types of the GSHP-PVT-PCMs and GSHP-PV from the energy and exergy points of view are compared. The obtained results demonstrate that the irreversibility of the solar modules of the GSHP-PVT-PCMs is 6.6% lower than that of the GSHP-PV. Furthermore, the calculation of the annual required load of the building for these two kinds of hybrid systems shows that the use of collectors in this combined system has reduced the total load of the building by 6.5%. The use of collectors in the GSHP-PVT-PCM gives rise to a difference in the value of solar factor (SF) of this system by 1.4% more than the one for the hybrid system without thermal collectors.

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Life Cycle Cost Analysis of Nearly-Zero Energy Buildings: An Introduction to the Methodologies

Amini Toosi,

Famiglietti,

Motta

2023

Environmental Footprints and Eco-Design of Products and Processes

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Transient simulation and multi-objective optimization of a VSD ground source heat pump in various usage

Cited by 15 publications

References 32 publications

Integrated system of exhaust air heat pump and advanced air distribution for energy-efficient provision of outdoor air

Integrated system of exhaust air heat pump and advanced air distribution for energy-efficient provision of outdoor air

Numerical simulation of geothermal‐PVT hybrid system with PCM storage tank

Life Cycle Cost Analysis of Nearly-Zero Energy Buildings: An Introduction to the Methodologies

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