Performance enhancement of a heat pump system with ice storage subcooler

Hsiao, Ming-Jer; Kuo, Yu-Fu; Shen, Chih-Chiu; Cheng, Chiao-Hung; Chen, Sih‐Li

doi:10.1016/j.ijrefrig.2009.11.002

Cited by 16 publications

(6 citation statements)

References 8 publications

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“…These methods include the air conditioning system utilizing a cold storage unit as a subcooler, the heat pump system with ice storage subcooler and the refrigeration system subcooled by liquid desiccant dehumidification as well as the CO 2 transcritical vapor compression cycle with thermoelectric subcooler [11][12][13][14][15]. Relevant analytical or experimental results in the literatures all confirmed improvements in performance when using the new subcooling methods in vapor compression refrigeration cycles.…”

Section: Introductionmentioning

confidence: 98%

Performance evaluation of an ejector subcooled vapor-compression refrigeration cycle

Xing

Yan

2015

Energy Conversion and Management

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Section: Introductionmentioning

confidence: 98%

Performance evaluation of an ejector subcooled vapor-compression refrigeration cycle

Xing

Yan

2015

Energy Conversion and Management

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“…Researchers in the past have used sensible thermal storage equipment, such as water tanks and ice storage equipment, to achieve load shifting or thermal management during an emergency or peak hours. Hsiao et al 4 studied the thermal performance of a heat pump (HP) system with an ice storage sub‐cooler in particular. The ice storage tank is used for subcooling when the cooling load exceeds the nominal value.…”

Section: Introductionmentioning

confidence: 99%

Operating performance of multi‐modular water‐phase change material tanks for emergency cooling in an underground shelter

Zeng

Yuan

Cao

et al. 2021

Intl J of Energy Research

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Summary Latent heat thermal energy storage can not only alleviate the mismatch between supply and demand but also improve the performance and dependability of the energy system. Unfortunately, previous research achieves a specific engineering load shifting using a single water‐phase change material (PCM) tank, the volume of which is tailored to the specific cooling or heating load. This paper proposes the concept of multi‐modular water‐PCM tanks (MMWPT), which offer flexibility and are simple to be mass‐produced, as thermal storage in an underground shelter's emergency mode. The thermal inertia of the geothermal energy is used to remain the PCM at solid state at first and to naturally cool the tank once they are melted. The mathematical model is created in MATLAB and validated by experiment with an NMBE of less than ±10% and RMSE of less than 30%. In addition, the MMWPT's thermal performance in various matrixes was investigated in an underground shelter where the peak load occurs suddenly and with low frequency. The result reveals that the ∆Twater in the scenario with matrix form of N (number of tanks in series) × 5 (number of tanks in parallel) is almost four times as that with matrix form of N × 1. By separating the water into five parallel water tanks, the corresponding EDD is 1.27‐1.28 times larger. Changing the N from 1 to 2 and 3 could increase the EDD by 3.0%‐12.5% and 5.9%‐25%, respectively. Three acceptable MMWPT matrixes were presented using the effective discharging duration (EDD) and temperature drop as assessment criteria. Additionally, PCM with a maximum phase change temperature (Titalicpch_PCM) of 19.41°C and a connection matrix of 3 × 4 is recommended when using a single charging cycle or active cooling approach. Otherwise, a Titalicpch_PCM of 22.41°C with a connection matrix of 3 × 5 is advised. This research is planned to give references for using the MMWPT in underground shelters to shift loads.

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“…Because the mechanical subcooling method needs an additional compressor to provide the driving force of subcooling, the electricity consumption of the compressor will carry an undesirable effect on the system COP. Considering that, some researchers utilize phase change materials (PCM) and heat pipes, in cold storage units, as a subcooler [13][14][15][16]. Hsiao et al [14] investigated the thermal performance of a heat pump system, with an ice storage subcooler, to supply heating and cooling demands to two greenhouses, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…Considering that, some researchers utilize phase change materials (PCM) and heat pipes, in cold storage units, as a subcooler [13][14][15][16]. Hsiao et al [14] investigated the thermal performance of a heat pump system, with an ice storage subcooler, to supply heating and cooling demands to two greenhouses, respectively. The results showed that in the charge mode, the heat pump COP of the ice storage system was 12% higher than that without the ice storage system; in the discharge mode, the ice storage system provided the refrigerator a COP 15% higher than that without the ice storage system.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of a novel subcooling method based on liquid desiccant dehumidification for vapor-compression refrigeration systems

She

Yin

Luo

et al. 2018

Applied Thermal Engineering

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Performance enhancement of a heat pump system with ice storage subcooler

Cited by 16 publications

References 8 publications

Performance evaluation of an ejector subcooled vapor-compression refrigeration cycle

Performance evaluation of an ejector subcooled vapor-compression refrigeration cycle

Operating performance of multi‐modular water‐phase change material tanks for emergency cooling in an underground shelter

Experimental study of a novel subcooling method based on liquid desiccant dehumidification for vapor-compression refrigeration systems

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