Gas Cooler Research Articles

Evaluation of the ejector two-stage compression refrigeration cycle with work performance from energy, conventional exergy and advanced exergy perspectives

Low temperature cold chain is the top priority of logistics development at this stage. CO2 (carbon dioxide) refrigeration system is widely used. However, the low efficiency of CO2 refrigeration system is the biggest obstacle to its development. In this research work, EES (Engineering equation solver) is used to simulate the system, which is widely used in thermodynamic modeling and calculation, a novel trans-critical CO2 refrigeration cycle with ejector for low-temperature storage is proposed. The energy and conventional exergy model of the system are established, and the advanced exergy model is established based on the conventional exergy model, and the actual performance of the system is analyzed, and the optimization potential of the system components is analyzed through the commonness of the two exergy analysis methods. The results show that the exergy destruction of each component of the ejector is the largest in the system, and the optimization potential is the highest in both conventional and advanced exergy models. After studying the influence of main parameters in the system cycle on the system performance and performance, it is found that there is an optimum intermediate pressure and gas cooler pressure in the system to maximize the system performance and efficiency. According to the influence of the change of system parameters on the system, it is found that the outlet temperature of gas cooler has the greatest influence on the optimization of ejector.

Uncertainty analysis of keff due to the random packing of pebbles in the pebble bed HTR

There has been an increasing demand for the uncertainty analysis for the numerical results from complicated High Temperature Gas Cooled Reactors (HTGRs) system with the continued development of HTGR. In the pebble bed HTR, not only the fuel and moderator pebbles are randomly packed, but also the packing fraction of fuel pebbles has some uncertainty. A new grid-based Expanding System Method (ESM) is proposed to generate an explicit pebble bed core model with random packing of pebbles with different packing fractions. Even more important, the keff uncertainty due to the random packing and uncertainty of packing fraction are quantified based on this high-fidelity model. The numerical results indicate that the grid-based ESM can efficiently generate a realistic pebble bed core model and the uncertainty of keff due to the random packing of pebbles is relatively smaller than the contribution of nuclear data.

Performance analysis and dynamic optimization of integrated cooling and power generation system based on supercritical CO2 cycle for turbine-based combined cycle engine

Turbine-based combined cycle (TBCC) engines are the most promising propulsion systems for the horizontal takeoff and landing of hypersonic vehicles. However, the high air-inlet temperature, engine-wall temperature, and electrical-energy demand hinder the application of the system. In this study, a novel integrated cooling and power generation system based on a supercritical CO2 recuperative Brayton cycle for hypersonic vehicles was proposed to meet the cooling requirements of each operating stage of a TBCC engine and to provide continuous power. Several optimization parameters able to balance the characteristics of the limited cold source, system weight, and power output of the system, such as the power-to-weight ratio and heat sink saving ratio, were proposed. With the help of optimization algorithms, the global performance curves and loads of each component were obtained during flights in the range of Mach 3.2∼6. The recuperator heat duty and compressor inlet temperature were key design parameters that affected system performance. The compressor inlet temperature is known to alter the heat sink utilization by changing the pinch point location in the gas cooler. The recuperator heat duty impacted both the system weight and power generation. The dynamic performance of the system indicated that the minimum heat sink saving ratio was approximately 10% during the entire flight, implying that the volume of fuel carried by the hypersonic vehicle could be reduced to some extent, while sufficient electricity was generated. The proposed system is a novel solution for thermal protection of TBCC engines and aircraft power generation technology under limited cold-source conditions.

Near-wall vortices and thermal simulation of coupled-domain transpiration cooling by a recursive regularized lattice Boltzmann method

The present study aims to reveal the near-wall vortices and the effects of flow states in coupled-domain transpiration cooling using a recursive regularized thermal lattice Boltzmann method (RR-TLBM). Large-eddy simulations of turbulent flow and heat transfer have been conducted on high-resolution computational grids using a desktop-level computer with CUDA 11.6. Results indicate that the near-wall flow structures present spatial characteristics along the streamwise direction. The vortex evolution promotes the downstream heat dissipation, even though turbulence impairs the effective cooling area. The spanwise evolvement of vortices strengthens the mixing of coolant and hot gas, and small-scale structures are beneficial for turbulent heat transfer. Moreover, the transition onset occurs earlier at higher Reynolds numbers, and it weakens the downstream cooling. The cooling performance of the derived coolant film is improved as the Reynolds number varies from 5 × 103 to 3 × 104 with a blowing ratio of F = 10%, whereas the local cooling is impaired at the high Reynolds numbers exceeding 5 × 104. The variation in flow states has little influence on the cooling performance at the Reynolds numbers larger than 3 × 106. On the other hand, our in-house RR-TLBM solver is highly stable and efficient for the simulation of flow and heat transfer with high Reynolds numbers. Simultaneously, a high computational performance of 1127 million lattices updated per second is achieved for our simulation of a coupled-domain turbulent flow and heat transfer, using the desktop-level computer with three Tesla V100 graphics processing units.

Pseudo-optimal discharge pressure analysis of transcritical CO2 electric vehicle heat pumps due to temperature glide

• A pseudo-optimal discharge pressure for electric vehicle heat pumps was proposed. • The principle of pseudo-optimal discharge pressure was explained. • Pseudo-optimal discharge pressure exists in subcritical and transcritical states. • The effects of conditions on pseudo-optimal discharge pressures were revealed. Performance improvement of electric vehicle heat pumps can enhance thermal comfort and reduce the power consumption of electric vehicles, hence stimulating their development. In this paper, the cyclic characteristics of an electric vehicle heat pump were studied under different operating modes and working conditions. Different from the optimal discharge pressure of conventional CO 2 systems which was determined by the variation gradient characteristics of the transcritical isotherm, the discharge pressure of electric vehicle heat pumps at the peak COP value was defined as a pseudo-optimal discharge pressure and was determined by the obvious temperature glide at the outlet of the gas cooler. This pseudo-optimal discharge pressure existed at both transcritical and subcritical states. The difference in the pseudo-optimal discharge pressure between the subcritical or transcritical states was first evaluated. Then an in-depth analysis of the influence of key parameters on the pseudo-optimal discharge pressure was studied to develop an accurate prediction method since the traditional prediction methods were not applicable. The results showed that pseudo-optimal discharge pressure increased with the ambient temperature, inlet air temperature, and supply air temperature. This study provides valuable information for the comprehensive performance optimization of an electric vehicle thermal management system.

Gas flow and heat transfer in granular energy-releasing materials: Novel computational model and important features

In this paper, the process of flowing the coolant gas through granular or porous media with heat-generating sources is considered. Such process takes place in various ruinous objects with energy release sources formed after natural or man-made disasters, e.g., in destroyed power unit of a nuclear power plant like exploded reactor No. 4 of the Chernobyl NPP. Also, this process is typical for some technologies, e.g., for innovative pebble-bed nuclear reactors. The aim of this work is, firstly, to develop a tool for numerical simulation of 3D processes in porous media with energy release sources, which will allow one to get the proper results quickly, and, secondly, to study some important features of these processes. A computational model and OpenFOAM solver have been developed in the work to simulate the fluid flow and heat transfer in granular or porous energy-releasing materials. The proposed mathematical model is based on the assumption of interacting interpenetrating continua, and the developed numerical method is based on the PIMPLE algorithm adapted for the system of governing equations. The novel OpenFOAM solver has been tested on 1D and 2D problems, which were previously solved by known algorithms based on the finite difference method. The new solver is faster by 1–3 orders of magnitude (depending on the number of cells in the mesh) and makes it possible to carry out calculations of 2D and 3D processes without parallelization within reasonable time, in contrast to the previously used numerical methods. The 3D gas flows through porous energy-releasing object have been studied, and some important features of these processes have been revealed. It has been shown that the temperature dependence of the gas dynamic viscosity leads not only to the fact that the gas tends to flow around the hot zones, but also to an additional increase in temperature in the heated area, caused by a drop of the density and velocity of the gas due to increasing the flow resistance force in this region. It has been revealed that if the total intensity of the energy release in the porous object is known a priori, but the relative location of the energy release sources is unknown, it is impossible to predict the maximum temperature of the object.

Application of PLC and HMI in the CO2 transcritical refrigeration experimental platform

The paper adopted SIMATIC PLC as the control center and cooperates with SIMATIC KTP900 basic touch screen and GRM533YW-C IOT module to design a CO2 transcritical refrigeration experiment platform (EXP). The EXP acquired analog signals from sensors through PLC expansion modules. The PLC communicated with the touch screen and the IoT module through PROFINET to achieve data interaction. In the EXP, the touch screen and the remote devices had separate control interfaces, both of which can perform system control and real-time data display. The control strategy and abnormal alarm of CO2 transcritical refrigeration system was accomplished in PLC. In the cooling experiment, the maximum deviation value of temperature was less than 0.4 °C in the refrigeration container. In the 750 W load step experiment, the static error of the temperature was ± 0.2 °C in the refrigeration container, and the static error of the superheat was ± 0.17 K. This indicated that the EXP had excellent control quality. The different control strategies for the compressor, gas cooler fan, auxiliary cooler fan, EEV and pressure regulating valve can be realized in the EXP. Therefore, the performance optimization of CO2 transcritical refrigeration system in different operating conditions can be studied.

An experimental study of coal particle group combustion in conventional and oxy-fuel atmospheres using multi-parameter optical diagnostics

The present work reports an experimental study of particle group combustion of pulverized bituminous coal in laminar flow conditions using advanced multi-parameter optical diagnostics. Simultaneously conducted high-speed scanning OH-LIF, diffuse backlight-illumination (DBI), and Mie scattering measurements enable analyses of three-dimensional volatile flame structures and soot formation in conventional (i.e., N2/O2) and oxy-fuel (i.e., CO2/O2) atmospheres with increasing O2 enrichment. Particle-flame interaction is assessed by calculating instantaneous particle number density (PND), whose uncertainties are estimated by generating synthetic particles in DBI image simulations. Time-resolved particle sequences allow the evaluation of the particle velocity, which indicates a PND dependency and interactions between particles and volatile flames. 3D flame structure reconstruction and soot formation detection are first demonstrated in single-shot visualizations and then extended to analyze effects of O2 concentration, PND, and inert gas composition statistically. The increasing O2 concentration significantly reduces local flame extinction and suppresses soot formation in N2 and CO2 atmospheres. Volatile flames reveal higher intensities and lower lift-off heights as O2 concentration increases. In contrast to that, an increased PND leads to earlier flame extinction and stronger soot formation due to the local gas temperature reduction and oxygen depletion. The lift-off height reduces with increasing PND, which is explained by the complex interaction between particle dynamics, heat transfer, and volatile reactions. Slightly stronger soot formation and delayed ignition are observed in CO2 atmospheres, whereas CO2 replacement reveals insignificant influences on the flame extinction behavior. Finally, non-flammability is quantified for particle group combustion at varying PNDs in different atmospheres.

Numerical investigation on the performance characteristics of a novel biomimetic honeycomb fractal gas cooler of transcritical CO2 heat pump

In order to improve the heat transfer performance of the gas cooler in transcritical CO2 heat pump system, a novel biomimetic honeycomb fractal heat exchanger, with the advantages of great heat transfer efficiency and high compactness, is proposed for the transcritical CO2 heat pump in this study. Also, the conjugate heat transfer performance between supercritical CO2 and water in the novel gas cooler is investigated by the computational fluid dynamics method. The results firstly indicate that the difference of peak heat transfer coefficient in various flow channels reaches to 20.4% when the inlet flow flux of CO2 is 30 kg/(m2·s), significantly influenced by the uneven distribution of density and the secondary flow caused by buoyancy force. Secondly, when the flow flux of CO2 is 30 kg/(m2·s), compared with the horizontal flow, the heat transfer coefficients decrease by 11.4% and 40.7%, respectively, as CO2 flows vertically upward and downward. Finally, the heat transfer coefficient and comprehensive performance of the biomimetic honeycomb fractal heat exchanger are 144.6% and 20.4% higher than those of the printed circuit heat exchanger. The comprehensive performance of the 2nd and 3rd level biomimetic honeycomb fractal heat exchangers are 59.7% and 92.4% higher than that of the 1st level biomimetic honeycomb fractal heat exchanger.

The Role of the Compressor Isentropic Efficiency in Non-Intrusive Refrigerant Side Characterization of Transcritical CO2 Heat Pump Water Heaters

Characterizing the refrigerant side of heat pump water heaters (HPWHs) can be intrusive and expensive. On the other hand, direct external measurement techniques can be unfeasible, particularly in commercial HPWHs for residential applications. Non-intrusive in situ characterization methods have already been successfully implemented in subcritical heat pumps. They provide the refrigerant mass flowrate and the equipment energy performance, by using contact temperature sensors and electric power meters. Subcritical suction and discharge-specific enthalpies necessary to apply the method can be obtained from the measured temperatures and their corresponding saturation pressures. Nevertheless, this approach does not apply to the transcritical CO2 HPWHs. In the supercritical region, temperature and pressure are independent variables, and an iterative process regarding the compressor isentropic efficiency has to be considered. However, when isentropic efficiency data are not available, an additional procedure is required, using a validated gas cooler model to verify the physical reliability of the numerical solutions. This work aims at presenting base thermodynamic analysis of a novel methodology for non-intrusive refrigerant side characterization of transcritical CO2 HPWHs, exploring the influence of the compressor isentropic efficiency condition.

Model-based sizing of a CO2 heat pump for residential use

CO2 heat pumps have advantages of reducing ozone layer damage and offering high-temperature hot water in comparison with traditional heat pumps. However, sizing of CO2 heat pump components that guarantees reliable performance is still challenging. Therefore, this study proposed a model-based sizing method to remedy this research gap. The quasi-dynamic model of the CO2 heat pump was developed by integrating dynamic and steady-state models. Model validation results demonstrated that average relative error for the outlet fluid temperature of evaporator and gas cooler were 7.8 % and 1.4 %, respectively. This indicated that the developed quasi-dynamic model was reliable. Modelling results indicated that coefficient of performance (COP) for the heat pump was 3.99 when the inlet water temperature in gas cooler and expansion valve opening were 24 °C and 28 %, respectively. The proposed model-based sizing method could effectively determine the optimal gas cooler area enlargement ratio in different compressor and expansion valve features. The results showed that higher priority to the operation and higer COP value, would favour larger gas cooler area, while higher priority on the investment cost would prefer lower gas cooler area. This study is useful to properly design and operate the CO2 heat pump.

Cooling of flue gas by cascade of polymeric hollow fiber heat exchangers

Polymeric hollow fibers heat exchangers can be effectively used for flue gas cooling. These heat exchangers are made of hundreds of hollow fibers with an outer diameter of 1.3 mm and a wall thickness of 0.15 mm. Selection of material allows to work with aggressive gasses and condensed liquids without risk of corrosion or damage by chemicals. These fibers may seem to be fragile, but they can stand up the inner pressure above 100 bar at room temperature and have burst pressure of 60 bar at temperature of 80 °C. Their surface is very smooth and that positively contributes to low fouling and its capability of self-cleaning. The flowing condensate is cleaning the fibers during its operating and it carries ash particles size up to 0.22 mm. No marks of abrasion or corrosion were observed on the fibers. Due to the low inner diameter of the fibers, the internal flow is laminar and heat transfer coefficient is velocity independent and high (2317 W/m2K). Values of overall heat transfer coefficient are over 100 W/m2K and are dominantly determined by heat transfer on the gas side. Measured volume heat performance of the tested heat exchangers varied from 4.2 MW/m3 to 2.2 MW/m3.

Study of New Mini-Channel Trans-Critical CO2 Heat Pump Gas Cooler.

A gas cooler is one of the important parts of a carbon dioxide (CO2) heat pump water heater, and it must meet the needs of not only pressurization but also heat transfer. It is important to study gas coolers. In this paper, a heat exchanger with a spiral channel is studied. ANSYS CFX software was used to analyze the flow and heat transfer characteristics of the heat exchanger (single-plate model). The influences of the cooling pressure of CO2, the mass flux of CO2, the mass flux of water and the channel radius of CO2 are discussed. In this paper, the results show that the cooling pressure of CO2, the mass flux of CO2 and the channel radius of CO2 all have a large influence on the local heat transfer coefficient: with an increase in the cooling pressure of CO2, the peak value of the heat transfer coefficient of CO2 decreases and the average heat transfer coefficient decreases; with an increase in the mass flux of CO2, the peak value of the heat transfer coefficient of CO2 increases and the average heat transfer coefficient increases; and with a decrease in the channel radius of CO2, the peak value of the heat transfer coefficient of CO2 increases. The water mass flux has only a slight effect on heat transfer, and the lower cooling pressure of CO2 corresponds to a higher peak heat transfer coefficient, which can reach 27.5 kW∙m−2∙K−1 at 9 MPa.

Hidden cooling flows in clusters of galaxies

ABSTRACT The radiative cooling time of the hot gas at the centres of cool cores in clusters of galaxies drops down to 10 Myr and below. The observed mass cooling rate of such gas is very low, suggesting that active galactic nucleus feedback is very tightly balanced or that the soft X-ray emission from cooling is somehow hidden from view. We use an intrinsic absorption model in which the cooling and coolest gas are closely interleaved to search for hidden cooling flows in the Centaurus, Perseus, and A1835 clusters of galaxies. We find hidden mass cooling rates of between 10 and $500\,{{\rm M_{\odot }}\,{\rm yr}^{-1}}$ as the cluster mass increases, with the absorbed emission emerging in the far-infrared (FIR) band. Good agreement is found between the hidden cooling rate and observed FIR luminosity in the Centaurus Cluster. The limits on the other two clusters allow for considerable hidden cooling. The implied total mass of cooled gas is much larger than the observed molecular masses. We discuss its fate including possible further cooling and collapse into undetected very cold clouds, low-mass stars, and substellar objects.

Optimal compressor discharge pressure and performance characteristics of transcritical CO2 heat pump for crude oil heating

The compressor discharge pressure is an important parameter for optimizing the performance of a transcritical CO2 heat pump system. In this study, the factors influencing the optimal compressor discharge pressure of an air source transcritical CO2 heat pump system were examined experimentally. The results showed that the optimal compressor discharge pressure is affected by the gas cooler water inlet temperature and gas cooler CO2 outlet temperature. Consequently, a correlation formula for the optimal compressor discharge pressure appropriate for a more comprehensive temperature range and higher prediction accuracy was determined based on the experimental data. Compared with the experimental results, the maximum error was less than 10%, which is minor considering the lower gas cooler CO2 outlet temperature. In addition, a control strategy for the optimal compressor discharge pressure based on the degree of superheat correction was proposed. Subsequently, under variable operating conditions, the air source transcritical CO2 heat pump crude oil heating system was continuously operated based on this control strategy. The results showed that the compressor discharge pressure agreed with the optimal compressor discharge pressure calculated using the new correlation formula. Compared with the control strategy of constant opening under a variable frequency mode, the results showed that the system could operate under the control strategy proposed in this paper, the thermodynamic perfection of the system being higher.

Supercritical Heat Transfer Characteristics and System Performance Analysis of R744 and Its Two Azeotropic Blends

Abstract A three-dimensional (3D) numerical model of the double-tubes heat exchanger was established by using fluent16.0 in this study. The supercritical flow and heat transfer characteristics of R744 and its two azeotropic blends in the gas cooler and their performance in the single-stage compression heat pump were investigated. The results showed that the peak value of the heat transfer capabilities of R744 was the highest, and that of R744/R170 was the lowest. With the increase in the pressure, the peak value of the heat transfer capabilities decreased, and the bulk temperature corresponding to the peak value of the heat transfer capabilities also increased. Moreover, the temperature of R744/R170 at the same position near the outlet of the tube section was lower under the different working conditions, which would be conducive in increasing the coefficient of performance (COP) of the system. Lastly, when R744 and its two azeotropic blends were employed in the single-stage compression heat pump system, the difference of COP between R744/R170 and R744 decreased with the increase of the outlet temperature in the gas cooler, and the difference of COP between R744/R41 and R744 increased.

Full Core Criticality Modeling of Gas-Cooled Fast Reactor using the SCALE6.0 and MCNP5 Code Packages

The Gas-Cooled Fast Reactor (GFR) is one of the reactor concepts selected by the Generation IV International Forum (GIF) for the next generation of innovative nuclear energy systems. It was selected among a group of more than 100 prototypes and his commercial availability is expected by 2030. GFR has common goals as the rest GIF advanced reactor types: economy, safety, proliferation resistance, availability and sustainability. Several GFR fuel design concepts such as plates, rod pins and pebbles are currently being investigated in order to meet the high temperature constraints characteristic for a GFR working environment. In the previous study we have compared the fuel depletion results for heterogeneous GFR fuel assembly (FA), obtained with TRITON6 sequence of SCALE6.0 with the results of the MCNPX-CINDER90 and TRIPOLI-4-D codes. Present work is a continuation of neutronic criticality analysis of heterogeneous FA and full core configurations of a GFR concept using 3-D Monte Carlo codes KENO-VI/SCALE6.0 and MCNP5. The FA is based on a hexagonal mesh of fuel rods (uranium and plutonium carbide fuel, silicon carbide clad, helium gas coolant) with axial reflector thickness being varied for the purpose of optimization. Three reflector materials were analyzed: zirconium carbide (ZrC), silicon carbide (SiC) and natural uranium. ZrC has been selected as a reflector material, having the best contribution to the neutron economy and to the reactivity of the core. The core safety parameters were also analysed: a negative temperature coefficient of reactivity was verified for the heavy metal fuel and coolant density loss. Criticality calculations of different FA active heights were performed and the reflector thickness was also adjusted. Finally, GFR full core criticality calculations using different active fuel rod heights and fixed ZrC reflector height were done to find the optimal height of the core. The Shannon entropy of the GFR core fission distribution was proved to be useful technique to monitor both fission source convergence (stationarity) and core eigenvalue convergence (keff) to fundamental eigenmode with MCNP5. All calculations were done with ENDF/B-VII.0 library. The obtained results showed high similarity with reference results.

Analysis of Influencing Factors of a Fully Enclosed Double-Cylinder CO2 Rotor Expander for Air-Conditioner

CO2 household air-conditioners are difficult to popularize due to their low efficiency. The use of the expander can reduce the throttling loss and increase the cooling capacity of the CO2 system. In this paper, a fully enclosed double-cylinder rotor expander is designed. The structure and working progress are introduced. The factors affecting the efficiency of the expander are theoretically analyzed. The results show that the design of high back pressure can greatly improve the efficiency. Moreover, the relative cylinder height of the first cylinder should be between 0.2 and 0.3, while the relative cylinder height of the second cylinder should be between 0.4 and 0.6. The relative eccentricity should be around 0.1. The expander is very suitable for the condition of high outlet temperature of the gas cooler. There is a peak mass flow rate when the efficiency of the expander is maximum. This paper provides theoretical support for the design and manufacture of expander.

Exergy destruction characteristics of a transcritical carbon dioxide two-stage compression/ejector refrigeration system for low-temperature cold storage

Cold storage is an irreplaceable part of food cold chain. In the present study, a novel transcritical carbon dioxide two-stage compression/ejector refrigeration system for low-temperature cold storage is proposed to freeze and refrigerate food. Also, a combination of conventional and advanced exergy methods is adopted to evaluate the exergy destruction characteristics inside the system. According to the advanced exergy method, 69.88% of the exergy destruction is endogenous, which suggesting that exergy destruction of the system is primarily contributed to the irreversibility of components themselves, meanwhile, the interactions between components are not very close. Among all components, the high-pressure compressor possesses the most tremendous avoidable endogenous exergy destruction, indicating that it has the maximum potential for optimization. And the rest of the improved order is the ejector, low-pressure compressor, evaporator, gas cooler and intercooler, while the high-pressure and low-pressure expansion valves have the lowest priority for optimization. Remarkably, there is a significant discrepancy between the conclusions obtained from these two exergy methods. Furthermore, the system was also found to have a COP of 0.42 under the actual operating condition and 0.62 under the unavoidable operating condition. The impacts of the ejector and compressor efficiencies, as well as discharge and intermediate pressure upon theoretical exergetic performance of the system are considered. The system exergy efficiency is respectively increased by 5.78%, 36.2% and 50% as the ejector, low-pressure and high-pressure compressor efficiencies ranging from 0.5 to 0.9. In addition, there exists an optimal intermediate pressure of 4.25 MPa and an optimal discharge pressure of 8.75 MPa from the perspective of system exergy efficiency.

ALMA Reveals Extended Cool Gas and Hot Ionized Outflows in a Typical Star-forming Galaxy at Z = 7.13

We present spatially resolved morphological properties of [C II] 158 μm, [O III] 88 μm, dust, and rest-frame ultraviolet (UV) continuum emission for A1689-zD1, a strongly lensed, sub-L* galaxy at z = 7.13, by utilizing deep Atacama Large Millimeter/submillimeter Array (ALMA) and Hubble Space Telescope (HST) observations. While the [O III] line and UV continuum are compact, the [C II] line is extended up to a radius of r ∼ 12 kpc. Using multi-band rest-frame far-infrared continuum data ranging from 52 to 400 μm, we find an average dust temperature and emissivity index of K and , respectively, across the galaxy. We find slight differences in the dust continuum profiles at different wavelengths, which may indicate that the dust temperature decreases with distance. We map the star formation rate (SFR) via IR and UV luminosities and determine a total SFR of 37 ± 1M ⊙yr−1 with an obscured fraction of 87%. While the [O III] line is a good tracer of the SFR, the [C II] line shows deviation from the local L [C II]-SFR relations in the outskirts of the galaxy. Finally, we observe a clear difference in the line profile between [C II] and [O III], with significant residuals (∼5σ) in the [O III] line spectrum after subtracting a single Gaussian model. This suggests a possible origin of the extended [C II] structure from the cooling of hot ionized outflows. The extended [C II] and high-velocity [O III] emission may both contribute in part to the high L [O III]/L [C II] ratios recently reported in z > 6 galaxies.