Evaporation heat transfer characteristics of R-245fa in a shell and plate heat exchanger for very-high-temperature heat pumps

Song, Kang Sub; Yun, Sungho; Lee, Jun Young; Kim, Kibong; Kim, Yongchan

doi:10.1016/j.ijheatmasstransfer.2020.119408

Cited by 18 publications

(6 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, Figure 4 shows the marked positions of the temperature sensors used to analyze the temperature distribution on the circular plate. The effective heat transfer area (A eff ) of the circular plate was calculated by Equation (1), and the enlargement factor and the hydraulic diameter (D h ) of the plate were calculated by Equations ( 2) and ( 3) [4][5][6]11], respectively.…”

Section: Experimental Apparatusmentioning

confidence: 99%

“…The two-phase condensation heat transfer coefficient of the PSHE was 5.9% lower on average than that of the PHE, and the pressure drop of the PSHE was 16.7% lower. Song et al [5] studied the two-phase evaporative heat transfer coefficient and pressure drop of the PSHE using R-245fa according to the direction of fluid flow at temperatures of 60-80 • C. The heat transfer performance of the upward flow was better than that of the downward flow. Jo et al [6] compared the two-phase evaporative heat transfer characteristics of R-1234ze(E) in the PHE and the PSHE by varying saturation temperature and heat flux.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Single-Phase Heat Transfer Characteristics of Water in an Industrial Plate and Shell Heat Exchanger under High-Temperature Conditions

et al. 2021

Self Cite

View full text Add to dashboard Cite

This study investigates the single-phase heat transfer, pressure drop, and temperature distribution of water in an industrial plate and shell heat exchanger (PSHE) under high-temperature conditions. In this experiment, the hot fluid flows downward on the plate side, while the cold fluid flows upward on the shell side. In the single-phase heat transfer experiment on water, the Nu is in the range of 7.85–15.2 with a Re from 1200 to 3200, which is substantially lower than that on the plate heat exchanger (PHE) studied previously. The decrease in the Nu is attributed to the reduced cross-sectional heat transfer area from the flow imbalance in the PSHE. As the Re increases, the pressure drop on the plate side increases more rapidly than that on the shell side because of the difference in the port pressure drop, flow direction, and flow position on the plate. When the Re is 2620, the pressure drops on the plate and shell sides are 52.5 kPa and 25.5 kPa, respectively, a difference of 51.4%. The temperature deviation on the circular plate increases as the Re decreases, especially between the edge and bottom of the plate because of uneven flow distribution on the plate.

show abstract

Section: Experimental Apparatusmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Single-Phase Heat Transfer Characteristics of Water in an Industrial Plate and Shell Heat Exchanger under High-Temperature Conditions

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…where C 2 can be considered constant as 1/3 [16] and Pr is the Prandtl number, which can be obtained from the following formula:…”

Section: Data Reductionmentioning

confidence: 99%

“…Correlations for Nu and f were also developed. Song et al [16] performed an experimental study on the evaporation heat transfer performance of a SPHE in high-temperature R-245fa heat pumps. Results showed improved evaporation HTC and increased two-phase ∆P with the increase in mass flux and vapor quality.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Thermofluid Characteristics of Shell-and-Plate Heat Exchangers

et al. 2020

View full text Add to dashboard Cite

An experimental study regarding the thermofluid characteristics of a shell-and-plate heat exchanger with different chevron angles (45°/45°, 45°/65°, and 65°/65°) with a plate diameter of 440 mm was carried out. Water was used as the working fluid on both sides and the corresponding temperatures ranged from 30–70 °C. The flow rate on the plate or shell side ranged from 10–60 m3/h. The effects of chevron angles on the heat transfer and fluid flow characteristics of shell-and-plate heat exchangers were studied in detail. With regard to the heat transfer performance on the plate side, a higher chevron angle (65°/65°) resulted in a significantly better performance than a low chevron angle (45°/45°). The effect of the chevron angle became even more pronounced at high Reynolds numbers. Unlike the plate side, an increase in the chevron angle had a negative effect on the heat transfer performance of the shell side. Additionally, this opposite effect was more prominent at low Reynolds numbers due to the comparatively large contribution of the manifold. The friction factor increased appreciably with the increase in the chevron angle. However, when changing the chevron angle from 45°/45° to 65°/65°, the increase in the friction factor was about 3–4 times on the plate side while it was about 2 times on the shell side. This can be attributed to the presence of the distribution/collection manifold on the shell side. Empirical correlations for the Nusselt number and friction factor were developed for different combinations of chevron angles with mean deviations of less than 1%.

show abstract

“…Some studies on the heat transfer and resistance characteristic of evaporators have been conducted in recent years [6][7][8] . Song et al [9] investigated the evaporation heat transfer and pressure drop of R-245fa in a shell and plate heat exchanger. The study shows that evaporation heat transfer forms a peak area when the quality is approximately 0.6-0.9 and presents a new heat transfer correlation with prediction of ±20%, but pressure drop increases nearly linearly.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Performance Study on the Novel Efficient Flow Pattern Global Construction Evaporator

Zhong

Bai

Ding

et al. 2021

Preprint

View full text Add to dashboard Cite

To improve in-tube evaporation heat transfer at low quality, a novel evaporator based on efficient flow pattern global construction heat transfer enhancement mechanism is built, called the efficient flow pattern global construction evaporator (EFGE). The numerical analysis and experimental study of the thermodynamic performance of the EFGE are performed. Results show that the evaporation heat transfer coefficient (HTC) of the EFGE is 0.34–1.04 times that of a common parallel flow evaporator (PFE) and the pressure drop of the EFGE is only 80–116% of that of a common PFE at quality 0.9. The theoretical nonuniformity of the evaporation HTC between low- and high-quality flow is approximately 12–67%, which 55–72% of the pressure drop. The numerical analysis results are in good agreement with the finding that the EFGE has better thermodynamic performance than the PFE in terms of friction power reduction and minimum entropy generation number.

show abstract

Evaporation heat transfer characteristics of R-245fa in a shell and plate heat exchanger for very-high-temperature heat pumps

Cited by 18 publications

References 26 publications

Single-Phase Heat Transfer Characteristics of Water in an Industrial Plate and Shell Heat Exchanger under High-Temperature Conditions

Single-Phase Heat Transfer Characteristics of Water in an Industrial Plate and Shell Heat Exchanger under High-Temperature Conditions

Experimental Investigation of the Thermofluid Characteristics of Shell-and-Plate Heat Exchangers

Thermodynamic Performance Study on the Novel Efficient Flow Pattern Global Construction Evaporator

Contact Info

Product

Resources

About