A techno-economic comparison of ground-coupled and air-coupled heat pump system for space cooling

Esen, Hikmet; İnallı, Mustafa; Esen, Mehmet

doi:10.1016/j.buildenv.2006.04.007

Cited by 459 publications

(93 citation statements)

References 12 publications

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“…The PV power generation P pv (k) is input data in this model, a variable power source from zero to its maximum rated, as shown in equation (8). The PV supplies P 5 (k) to the HPWH , P 6 (k) to the loads and P 4 (k) feed-in to the grid.…”

Section: Photovoltaicmentioning

confidence: 99%

“…Many researchers [3], [4], [5], [6], [7] have presented models that can efficiently recover the natural surrounding ambient energy through a combination of techniques. Esen [8] and [9] extensively investigated the effects of the ground-sourced and air-sourced heat pump systems and carried out the techno-economical analysis. These efforts are directed at improving the COP of the HPWHs.…”

Section: Introductionmentioning

confidence: 99%

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Optimal energy control of grid tied PV–diesel–battery hybrid system powering heat pump water heater

Sichilalu

Xia

2015

Solar Energy

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This paper develops an optimal control strategy for power dispatch of the grid-tied photovoltaic (PV) -battery-diesel system to power heat pump water heaters (HPWH). The system consists of the PV modules, grid, battery, HPWH, diesel generator (DG) and other domestic appliances. The PV can simultaneously feed in the excess power to the grid and supply the loads. The battery is used as storage of cheaper-to-buy off-peak grid energy, dependent on the time-of-use (TOU) electricity tariff, whilst the DG is a backup power source to the HPWH. The objective function of the model is to minimize energy and fuel cost while maximizing PV energy trade-off for incentives. The TOU is an important control parameter in this model. The power flows from each power source are the control variables. The optimal control shows a great potential to realize a practical net zero-energy building and demand side management. This model meets both the technical and operational constraints. A case study is done based on a 3x16kW HPWH installed at a Pretoria hotel in South Africa. Simulations run over a year on selected seasonal dates using the actual measured demand of the HPWH. The optimal control problem is solved using a mixed integer non-linear program and the results show how TOU affects the power dispatch to the HPWH. The energy and cost savings are presented in this paper.

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Section: Photovoltaicmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimal energy control of grid tied PV–diesel–battery hybrid system powering heat pump water heater

Sichilalu

Xia

2015

Solar Energy

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“…The first one was a ground source heat pump system designed and constructed for investigating geothermal resources with low temperatures, and the second was a ground source heat pump with a vertical ground heat exchanger. Esen, Inalli, and Esen (2007) made a techno-economic comparison between a ground-couple heat pump system (GCHP) and air coupled heat pump (ACHP) system. The experimental results were obtained from June to September, the cool season, in 2004.…”

Section: Introductionmentioning

confidence: 99%

Determining the Working Conditions of Heat Pump Components According to Running Modes

Çakır¹,

Çomaklı²

2014

Int J Automot Mech Eng

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In this study a detailed exergetic analysis is made of the components of heat pumps by changing the heat source and heat sink fluid as either water or air. To realize this aim a multifunctional heat pump test system was used, which can be run in four modes, air to air, air to water, water to air and water to water, using one compressor. When the system is run in water to air mode compressor exergy efficiency reaches its highest value. When the system is run in air to water mode the exergy efficiency of the compressor falls to its lowest value. In the heat pump's water to air mode the exergy destruction rate of the compressor becomes minimal. Exergetic performance of the condenser is best when the system is run in water to air mode. When the system runs in air to air mode, the exergy destruction rate of the condenser is at maximum, and falls to minimum when the system runs in air to water mode. Water to water is the running mode in which evaporator exergy efficiency is the best. Exergy efficiency of the evaporator decreases when the temperature of the evaporator fluid increases. Maximum compressor exergy efficiency increases according to an increase of mass flow rate is seemed in the air to air mode. The heat pump mode in which the exergy destruction rate of the compressor is minimal, is water to air mode. The running modes in which the condenser and compressor work with maximum and minimum efficiency are the same: water to air, and air to water modes. The compressor is the component which has maximum exergy efficiency with an average of 61.04% for all tests. Exergy efficiency of the condenser is lowest for all tests with an average of 14.25%

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“…For the HGSHP system design the ClimateMaster Tranquility TT heat pump is considered, with a dual stage heat pump unit capable of full load and 67% part load operation. The auxiliary cooling system selected in this study is a nonreversible air-source heat pump (water-to-air), with an assumed average COP of 3.2 (Esen et al 2007).…”

Section: Building Energy Simulation and Hybrid System Designmentioning

confidence: 99%

Effect of an Off-Peak Ground Pre-Cool Control Strategy on Hybrid Ground-Source Heat Pump Systems

Alaica¹,

Dworkin²

2017

Proceedings of the IGSHPA Technical/Research Conference and Expo 2017

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A techno-economic comparison of ground-coupled and air-coupled heat pump system for space cooling

Cited by 459 publications

References 12 publications

Optimal energy control of grid tied PV–diesel–battery hybrid system powering heat pump water heater

Optimal energy control of grid tied PV–diesel–battery hybrid system powering heat pump water heater

Determining the Working Conditions of Heat Pump Components According to Running Modes

Effect of an Off-Peak Ground Pre-Cool Control Strategy on Hybrid Ground-Source Heat Pump Systems

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