Comparative study of hybrid ground source heat pump in cooling and heating dominant climates

Bina, Saeid Mohammadzadeh; Fujii, Hikari; Tsuya, Shunsuke; Kosukegawa, Hiroyuki

doi:10.1016/j.enconman.2021.115122

Cited by 23 publications

(6 citation statements)

References 21 publications

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“…The traditional design of a cold storage system is usually based on the time-driven shift load of the design day. The essence of this method is to assume that the daily air conditioning load of the full refrigeration season is the same as the time-driven shift load change of the design day [6][7]. The calculation of cooling air conditioning system full refrigeration season operation performance often uses the design day by loading on behalf of the full cooling season every day by load distribution rule, calculates design day different load rate operating performance throughout the day and all the typical refrigeration season load rate scenario of the number of days and calculates the system full cooling season operation performance [8].…”

Section: Introductionmentioning

confidence: 99%

Design optimization method of heating and cooling full cycle storage air conditioning in integrated energy system

Biao,

Li,

Tan

et al. 2024

J. Phys.: Conf. Ser.

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Heating and cooling storage air conditioning is an important part of the integrated energy system, which can play an important role in the flexible conversion of thermoelectric coupling systems. Because storage air conditioning involves the dynamic characteristics of power supply on the source side and cold and heat demand on the load side, system capacity allocation is a problem of technical and economic optimization. This paper breaks through the traditional design method based on the hourly load distribution law of typical design days and proposes a performance-oriented design method for the bidirectional full-cycle dimension storage air conditioning system based on the system’s annual operation performance, which can take into account the hourly dynamic load distribution law of every day in the full heating season and the full cooling season coupled with the bidirectional demand of cold and heat loads. A more scientific and reasonable capacity configuration scheme for the storage air conditioning system is obtained. The design is presented with a concrete case.

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Section: Introductionmentioning

confidence: 99%

Design optimization method of heating and cooling full cycle storage air conditioning in integrated energy system

Biao,

Li,

Tan

et al. 2024

J. Phys.: Conf. Ser.

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“…It is mentioned that there are many types of pipe materials used in the literature. It has been experimented with the use of steel pipes, − copper, , and ground pipes in GHE made of polyvinyl chloride (PVC). − As stated in prior works, − they used plastic tubes in their experiments, while , used polyethylene (PE). The last pipe (PE pipe) consists of (60%) polybutylene, then steel (14%) and PVC (8%), and it is one of the most widely used pipes in GHE systems. − HDPE pipes are currently being adopted in GHEs applications due to their high corrosion resistance despite their low thermal conductivity.…”

Section: Introductionmentioning

confidence: 99%

“…The choice of either of these two modes depends on the conditions of the site on which the station will be located (geography of the site, soil type, and area size). When working in a geothermal system for shallow soil, horizontal pipes are usually deployed at a depth of 1–2 meters below the surface of the earth, and this option is the least expensive to dig and easier to organize and distribute the pipes. − However, in such systems, there is a need to occupy large areas of land to create better conditions for heat transfer which improves the thermal performance of GHE . When working in a vertical geothermal system, the pipes are buried vertically deep in the soil (sometimes up to 2000 meters) in depths ranging from 50 to 200 meters. , Selecting this type of system provides better thermal performance when compared with previous methods which require a small land area.…”

Section: Introductionmentioning

confidence: 99%

“…When working in a geothermal system for shallow soil, horizontal pipes are usually deployed at a depth of 1–2 meters below the surface of the earth, and this option is the least expensive to dig and easier to organize and distribute the pipes. 46 − 49 However, in such systems, there is a need to occupy large areas of land to create better conditions for heat transfer which improves the thermal performance of GHE. 50 When working in a vertical geothermal system, the pipes are buried vertically deep in the soil (sometimes up to 2000 meters) in depths ranging from 50 to 200 meters.…”

Section: Introductionmentioning

confidence: 99%

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Cooling of a PVT System Using an Underground Heat Exchanger: An Experimental Study

Majeed,

Abdul-Zahra,

Mutasher

et al. 2023

ACS Omega

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In the recent decades, the researchers have been focused on the use of photovoltaic thermal (PVT) systems that provide the best performance and cooling for the photovoltaic panels. In this study, a PVT system consisting of a monocrystalline PV panel and a spiral heat exchanger was connected to an underground heat exchanger that is buried at a depth of 4 m below the surface of the earth. The procedure of the current study can be considered the first of its kind in the Middle East and North Africa region (based on the researchers' knowledge). The study was carried out on agricultural land in Baghdad-Iraq during months of July and August-2022, which are considered the harshest weather conditions for this city. The heat exchanger consists of a copper tube with a length of 21 m and formed in the shape of 3U, and it was buried in the earth and connected with a PVT system. The results of the study showed that the site chosen to bury the heat exchanger (4 m deep) has a stable soil temperature at 22.5 °C. From various volumetric flow rates, a flow rate of 0.18 l/s was selected which is considered the highest flow rate that can show vibration in the PVT system which may harm the system. The practical measurements showed that the largest difference in the surface temperatures of standalone PV and PVT was around 20 °C in favor of the latter. The electrical efficiency of the studied PVT system also increased to outperform the standalone PV system by 127.3%. By comparing the results of the current study with studies of water-cooled PVT systems from the literature, it is clear that the proposed system is feasible and has an acceptable efficiency in such harsh weather conditions tested during the experiment.

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“…GHEs can be mainly installed vertically [29,30] or horizontally [31,32] depending on the available shallow geothermal conditions. There are two types of shallow GE systems: earth air heat exchanger [33,34] and ground source heat pump [35,36].…”

mentioning

confidence: 99%

Experimental investigation into the potential of using a shallow ground-cooled condenser in Lebanon

Mahmoud

Alkhedher

Ramadan

et al. 2022

Energy Conversion and Management

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Comparative study of hybrid ground source heat pump in cooling and heating dominant climates

Cited by 23 publications

References 21 publications

Design optimization method of heating and cooling full cycle storage air conditioning in integrated energy system

Design optimization method of heating and cooling full cycle storage air conditioning in integrated energy system

Cooling of a PVT System Using an Underground Heat Exchanger: An Experimental Study

Experimental investigation into the potential of using a shallow ground-cooled condenser in Lebanon

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