Field study on cooling performance of a heat recovery ground source heat pump system coupled with thermally activated building systems (TABSs)

Hu, Rong; Li, Xiaoping; Liang, Jincan; Wang, Haolin; Liu, Gang

doi:10.1016/j.enconman.2022.115678

Cited by 18 publications

(3 citation statements)

References 39 publications

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“…Such U-shaped BHE-based GSHPs are recommended to be used in almost the entire territory of Kazakhstan, especially where severe winters are observed. The influence of the atmospheric air temperature on vertical GHEs is found to be insignificant [17][18][19][20].…”

Section: Introductionmentioning

confidence: 91%

Experimental and Theoretical Investigations of a Ground Source Heat Pump System for Water and Space Heating Applications in Kazakhstan

et al. 2022

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The ground source heat pump heating system is considered as one of the best solutions for the transition towards green heating under the continental climate conditions like Kazakhstan. In this paper, experimental and theoretical investigations were carried out to develop a ground source heat pump-based heating system under the weather conditions in Kazakhstan and to evaluate its thermodynamic performance. The water-to-water heat pump heating system, integrated with a ground source heat exchanger and used refrigerant R134a, was designed to provide hot water to meet the requirements for space heating. The predicted values of the coefficient of performance and the experimental results were found to be in good agreement within 6.2%. The thermodynamic performance of the system was also assessed using various environment-friendly refrigerants, such as R152a, R450A, R513A, R1234yf and R1234ze, as potential replacements for R134a. Although R152a is found to be a good alternative for R134a in terms of coefficient of performance and total equivalent warming impact, its flammability hinders its application. The heating system using refrigerants R450A, R513A, R1234yf and R1234ze shows 2–3% lower coefficient of performance than that of R134a. The highest exergy destruction is found to be attributed to the compressor, followed by the expansion valve, evaporator, and condenser. Considering their low flammability and low environmental impact, R450A, R513A, R1234yf and R1234ze are identified as valuable replacements for R134a.

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Section: Introductionmentioning

confidence: 91%

Experimental and Theoretical Investigations of a Ground Source Heat Pump System for Water and Space Heating Applications in Kazakhstan

et al. 2022

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“…Thus, the cooling surface can increase the cooling load and reduce the impacts of the thermal mass of enclosure structures and furniture on radiant heat gain. The higher the radiant heat gain, the greater the cooling load [22]. In addition, the heat gain absorbed by the cooling surface is conducted to its internal hydronic system, and it does not necessarily equal the cooling load of the radiant system because of the thermal mass surrounding the internal water pipes.…”

Section: Space Cooling Load and Control Variablesmentioning

confidence: 99%

Thermal Environment Analysis and Optimization for Large Space Buildings with Radiant Cooling Floors: A Case Study of Xianyang International Airport

Hu,

Wang,

Liang

et al. 2024

Buildings

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Radiant cooling floors combined with ventilation systems have been widely applied in large space buildings. However, there has been a lack of research on system control strategies for their adaptation to weather changes. This study aimed to find control strategies for radiant cooling floors combined with displacement ventilation systems used in large space buildings in order to achieve energy conservation and environmental improvement. Supply air temperature and cooling surface temperature were determined to be the control variables. It was found that cooling capacity of the combined system and the comfort index, PMV (predicted mean vote), were linear in relation to the supply air temperature and cooling surface temperature. The linear equations regarding cooling capacity and PMV were established separately using environment data, and then the optimal region was determined. A case study on Terminal 3 of Xi’an Xianyang International Airport was conducted. The thermal environment was investigated through on-site measurements, questionnaires, and numerical simulations with CFD (computational fluid dynamics). It was found that supply air temperature and cooling surface temperature had a significant impact on PMV, and less impact on the cooling capacity. Therefore, it was determined that the supply air temperature should be altered first when the indoor temperature exceeds the upper limit, and then the cooling surface temperature should be changed if the indoor environment continues to overheat with the supply air temperature set to 18 °C. Thus, the supply air temperature was kept at 18 °C, and the floor surface temperature was set to be 22 °C on a high-temperature day. The average PMV was 0.87, and the cooling capacity of the combined system was 200 W/(m2·K), according to the CFD simulation. In addition, the surface heat transfer coefficient of the cooling floor was found to be 10.26 W/(m2·K). This research provides important references for the design and operational management of radiant cooling floors in large space buildings.

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“…Hence, they are normally very difficult to access, and measurements are very troublesome for occupants during their normal operation. That is why most of the experimental studies on TABS concern control-oriented applications in terms of energy use [11][12][13][14] or were performed under laboratory conditions in simple test rooms [15,16].…”

Section: Introductionmentioning

confidence: 99%

Influence of the TABS Material, Design, and Operating Factors on an Office Room’s Thermal Performance

Bobula,

Michalak,

Wołoszyn

2024

Energies

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Reducing energy consumption in residential and commercial buildings is an important research topic. Thermally activated building systems are a promising technology for significantly reducing energy consumption. The high thermal inertia, large surfaces, and radiative nature are advantages of these systems, but, on the other hand, this makes the system control and design complex. A transient simulation is also required to address the dynamic behavior of the system. The influence of 19 factors (material, design, and operating parameters) on the air temperature and mean radiant temperature inside the room as well as the required cooling equipment power were analyzed to better understand the system. The screening experiment was conducted using the random balance design method, and measurement data were used to validate the resistance–capacitance model. The analysis was performed using the Plackett–Burman design and a design with randomly selected points from a full factorial experiment. The results show that internal heat gains and the inlet water temperature have a significant influence on the system, and the influence of the screed’s properties is insignificant compared to other parameters. It should be borne in mind that the obtained results and conclusions are valid for the assumed range of factors’ variability.

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Field study on cooling performance of a heat recovery ground source heat pump system coupled with thermally activated building systems (TABSs)

Cited by 18 publications

References 39 publications

Experimental and Theoretical Investigations of a Ground Source Heat Pump System for Water and Space Heating Applications in Kazakhstan

Experimental and Theoretical Investigations of a Ground Source Heat Pump System for Water and Space Heating Applications in Kazakhstan

Thermal Environment Analysis and Optimization for Large Space Buildings with Radiant Cooling Floors: A Case Study of Xianyang International Airport

Influence of the TABS Material, Design, and Operating Factors on an Office Room’s Thermal Performance

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