International Journal of Refrigeration

Papers
(The TQCC of International Journal of Refrigeration is 9. The table below lists those papers that are above that threshold based on CrossRef citation counts [max. 250 papers]. The publications cover those that have been published in the past four years, i.e., from 2020-04-01 to 2024-04-01.)
ArticleCitations
HFO refrigerants: A review of present status and future prospects.99
Analysis of lower GWP and flammable alternative refrigerants92
Optimal design and environmental, energy and exergy analysis of a vapor compression refrigeration system using R290, R1234yf, and R744 as alternatives to replace R134a75
Heat pumps and solar energy: A review with some insights in the future67
Optimization of Microchannel Heat Sink with Rhombus Fractal-like Units for Electronic Chip Cooling65
A review of stability, thermophysical properties and impact of using nanofluids on the performance of refrigeration systems63
Investigation of a refrigeration system based on combined supercritical CO2 power and transcritical CO2 refrigeration cycles by waste heat recovery of engine52
Preparation of a low-temperature nanofluid phase change material: MgCl2–H2O eutectic salt solution system with multi-walled carbon nanotubes (MWCNTs)52
A novel hydrogen liquefaction process based on LNG cold energy and mixed refrigerant cycle52
Applying a variable geometry ejector in a solar ejector refrigeration system49
Applications of refrigerant R1234yf in heating, air conditioning and refrigeration systems: A decade of researches47
The effects of ice crystal on water properties and protein stability of large yellow croaker (Pseudosciaena crocea)46
Experimental investigation of a vapour compression refrigeration system using R134a/Nano-oil mixture45
Thermo-economic and environmental analysis of a small capacity vapor compression refrigeration system using R290, R1234yf, and R600a45
Fault diagnosis of VRF air-conditioning system based on improved Gaussian mixture model with PCA approach44
Thermodynamic and process modeling of the recovery of R410A compounds with ionic liquids43
Optimal discharge pressure in transcritical CO2 heat pump water heater with internal heat exchanger based on pinch point analysis43
Effects of temperature fluctuations on the meat quality and muscle microstructure of frozen beef43
Effects of the magnetic field on the freezing process of blueberry43
Energy and exergy analyses of R513a as a R134a drop-in replacement in a vapor compression refrigeration system42
Evaluation of low-GWP and mildly flammable mixtures as new alternatives for R410A in air-conditioning and heat pump system42
Energy, exergy, and environmental (3E) analysis of a compound ejector-heat pump with low GWP refrigerants for simultaneous data center cooling and district heating41
Proposal and thermoeconomic evaluation with reliability considerations of geothermal driven trigeneration systems with independent operations for summer and winter41
Experimental determination of the optimum working conditions of a transcritical CO2 refrigeration plant with integrated mechanical subcooling40
Evaporation of R32/R152a mixtures on the Pt surface: A molecular dynamics study40
Two-phase liquid-immersion data center cooling system: Experimental performance and thermoeconomic analysis39
A review of application status and replacement progress of refrigerants in the Chinese cold chain industry39
Density and viscosity of a polyol ester lubricant: Measurement and molecular dynamics simulation38
Theoretical analysis on a novel two-stage compression transcritical CO2 dual-evaporator refrigeration cycle with an ejector37
Solid desiccant-based dehumidification systems: A critical review on configurations, techniques, and current trends37
Novel chiller fault diagnosis using deep neural network (DNN) with simulated annealing (SA)37
The factors influencing the flavor characteristics of frozen obscure pufferfish (Takifugu Obscurus) during storage: Ice crystals, endogenous proteolysis and oxidation37
Effect of long-term storage, ultra-low temperature, and freshness on the quality characteristics of frozen tuna meat36
Performance analysis of a modified dual-ejector and dual-evaporator transcritical CO2 refrigeration cycle for supermarket application35
Measurement and modelling of the thermodynamic properties of carbon dioxide mixtures with HFO-1234yf, HFC-125, HFC-134a, and HFC-32: vapour-liquid equilibrium, density, and heat capacity35
The life cycle climate performance evaluation of low-GWP refrigerants for domestic heat pumps34
Experimental analysis of the use of R1234yf and R1234ze(E) as drop-in alternatives of R134a in a water-to-water heat pump34
A novel method of osmotic-dehydrofreezing with ultrasound enhancement to improve water status and physicochemical properties of kiwifruit33
Performance evaluation of R1234yf heat pump system for an electric vehicle in cold climate33
Comparative study on the cooling performance of evaporative cooling systems using seawater and freshwater32
A novel dual-temperature ejector-compression heat pump cycle - exergetic and economic analyses32
Experimental investigation on a direct-expansion solar-assisted heat pump water heater using R290 with micro-channel heat transfer technology during the winter period32
Preparation, characterisation and energy storage performance study on 1-Decanol-Expanded graphite composite PCM for air-conditioning cold storage system31
Thermodynamic analysis of a petroleum volatile organic compounds (VOCs) condensation recovery system combined with mixed-refrigerant refrigeration31
A numerical study on thermal management of a lithium-ion battery module via forced-convective air cooling31
A 15kW magnetocaloric proof-of-concept unit: Initial development and first experimental results30
Effects of ultrasound-assisted immersion freezing on the muscle quality and physicochemical properties of chicken breast30
Thermodynamic analysis and performance evaluation of activated carbon-ethanol two-bed solar adsorption cooling system30
Characterization of silica gel-based composites for adsorption cooling applications30
Reversed regenerative Stirling cycle machine for refrigeration application: A review30
Study on optimized adsorption chiller employing various heat and mass recovery schemes29
Integrated adsorption-based multigeneration systems: A critical review and future trends29
Thermal performance of cold panels with phase change materials in a refrigerated truck29
A general heat transfer correlation for flow condensation in single port mini and macro channels using genetic programming29
Energy, exergy and exergoeconomic evaluation of the air source transcritical CO2 heat pump with internal heat exchanger for space heating29
Numerical study of liquid nitrogen based pulsating heat pipe for cooling superconductors28
Experimental investigation on a -40 °C low-temperature freezer using ejector-expansion refrigeration system28
Energy and exergy performance evaluation of a three-stage auto-cascade refrigeration system using low-GWP alternative refrigerants28
Experimental investigation of the performance of an R1270/CO2 cascade refrigerant system28
Entropy generation and sensitivity analysis of R134a flow condensation inside a helically coiled tube-in-tube heat exchanger28
Experimental measurement and modelling of vapor-liquid equilibrium for 3,3,3- Trifluoropropene (R1243zf) and trans-1,3,3,3-Tetrafluoropropene (R1234ze(E)) binary system28
Comparative analysis of HFO-1234ze(E) and R-515B as low GWP alternatives to HFC-134a in moderately high temperature heat pumps28
Flow boiling heat transfer of zeotropic mixture R1234yf/R32 inside a horizontal multiport tube28
Data-driven fault diagnosis for residential variable refrigerant flow system on imbalanced data environments27
Predictions of European refrigerants place on the market following F-gas regulation restrictions27
CFD analysis for predicting cooling time of a domestic refrigerator with thermoelectric cooling system27
Experimental comparison of R744 and R134a heat pump systems for electric vehicle application27
Unsteady characteristic and flow mechanism of a scroll compressor with novel discharge port for electric vehicle air conditioning27
Performance analysis of an integrated adsorption and absorption refrigeration system27
A comprehensive review: Fault detection, diagnostics, prognostics, and fault modeling in HVAC systems27
Effects of immersion freezing methods on water holding capacity, ice crystals and water migration in grass carp during frozen storage26
A magnetic wine cooler prototype26
TEWI analysis of a stand-alone refrigeration system using low-GWP fluids with leakage ratio consideration26
Characterization of choking flow behaviors inside steam ejectors based on the ejector refrigeration system26
Novel design of a high efficiency multi-bed active magnetic regenerator heat pump26
Experimental investigation on the low-GWP HFC/HFO blends R454A and R454C in a R404A refrigeration system25
Heat and mass transfer performance comparison of various absorbers/desorbers towards compact and efficient absorption heat pumps25
Semi-empirical and environmental assessment of the low GWP refrigerant HCFO-1224yd(Z) to replace HFC-245fa in high temperature heat pumps25
Molecular dynamics simulation of thermophysical properties and condensation process of R1233zd(E)25
LaFeSi-based magnetocaloric material analysis: Cyclic endurance and thermal performance results25
A consistent thermodynamic molecular model of n-hydrofluoroolefins and blends for refrigeration applications25
Effects of ZnO/water nanofluid on the thermal performance of wet cooling towers24
Research on Effects of Vapor Injection on Twin-screw Compressor Performance24
Review of small-capacity single-stage continuous absorption systems operating on binary working fluids for cooling: Compact exchanger technologies24
Experimental comparisons on a gas engine heat pump using R134a and low-GWP refrigerant R152a24
Convective condensation of R600a, R290, R1270 and their zeotropic binary mixtures in horizontal tubes24
Investigating the performance of novel green solvents in absorption refrigeration cycles: Energy and exergy analyses24
Prediction on the viscosity and thermal conductivity of hfc/hfo refrigerants with artificial neural network models24
Enhanced cyclic stability of elastocaloric effect in oligocrystalline Cu–Al–Mn microwires via cold-drawing24
Experimental enhancement of a CO2 transcritical refrigerating plant including thermoelectric subcooling24
Review on the simulation models of the two-phase-ejector used in the transcritical carbon dioxide systems23
Drop-in experiments and exergy assessment of HFC-32/HFO-1234yf/R744 mixture with GWP below 150 for domestic heat pumps23
Analysis of an internal structure for refrigerated container: Improving distribution of cooling capacity22
Performance maximization by temperature glide matching in energy exchangers of cooling systems operating with natural hydrocarbon/CO2 refrigerants22
Thermal conductivity measurement and correlation at saturation condition of HFO refrigerant trans-1,1,1,4,4,4-hexafluoro-2-butene (R1336mzz(E))22
Thermal conductivity measurements and correlations of pure R1243zf and binary mixtures of R32 + R1243zf and R32 + R1234yf22
Numerical modeling of droplets injection in the secondary flow of the wet steam ejector in the refrigeration cycle22
Research on inhibition of flame retardants on flammability of R1234yf22
Condensation heat transfer of R1234yf in a small diameter smooth and microfin tube and development of correlation22
Theoretical performance assessment of low-GWP refrigerant R1233zd(E) applied in high temperature heat pump system22
A review on current status of capacity control techniques for two-phase ejectors22
Thermodynamic properties of trifluoroethene (R1123): (p, ρ, T) behavior and fundamental equation of state21
Feasibility of solar-geothermal hybrid source heat pump for producing domestic hot water in hot climates21
Effects of CO2 snow addition during kneading on thermoregulation, dough rheological properties, and bread characteristics: A focus on ancient and modern wheat cultivars21
A novel configuration of ejector refrigeration cycle coupled with organic Rankine cycle for transformer and space cooling applications21
Experimental study on combined low temperature regeneration of liquid desiccant and evaporative cooling by ultrasonic atomization21
Comparative performance analysis of a solar assisted heat pump for greenhouse heating in Tunisia21
Experimental investigation on a novel arrangement of wet medium for evaporative cooling of air21
Experimental investigation and application analysis on an integrated system of free cooling and heat recovery for data centers21
Theoretical study on a modified single‐stage autocascade refrigeration cycle with auxiliary phase separator20
Non-equilibrium approach for the simulation of CO2 expansion in two-phase ejector driven by subcritical motive pressure20
Numerical optimization of a heat exchanger with slit fins and vortex generators using genetic algorithms20
Energetic optimization and exergetic performance investigation of an ejector refrigeration system using HCFO-1233zd(E) as a refrigerant20
Research on flammability of R290/R134a, R600a/R134a and R600a/R290 refrigerant mixtures20
Comparative study on the series, parallel and cascade cycles of a multi-mode room temperature magnetic refrigeration system20
COVID 19 vaccine distribution solution to the last mile challenge: Experimental and simulation studies of ultra-low temperature refrigeration system20
Experimental measurement of vapor-liquid equilibrium for 3,3,3-trifluoropropene(R1243zf) + 1,1,1,2-tetrafluoroethane(R134a) at temperatures from 243.150 to 293.150 K20
Performance analysis and comprehensive comparison between CO2 and CO2/ethane azeotropy mixture as a refrigerant used in single-stage and two-stage vapor compression transcritical cycles20
Applying genetic programming in estimation of frost layer thickness on horizontal and vertical plates at ultra-low temperature20
Abnormal energy consumption detection for GSHP system based on ensemble deep learning and statistical modeling method20
Experimental performance analysis of a CO2 direct-expansion solar assisted heat pump water heater20
Performance enhancement of adsorption cooling cycle by pyrolysis of Maxsorb III activated carbon with ammonium carbonate20
Experimental study on an air-cooled air conditioning unit with spray evaporative cooling system20
Desiccant coated heat exchanger and its applications19
A comparative study of various machine learning methods for performance prediction of an evaporative condenser19
Performance investigation of hybrid adsorption-compression refrigeration system accompanied with phase change materials − Intermittent characteristics19
Effectiveness of ice structuring protein on the myofibrillar protein from mirror carp (Cyprinus carpio L.) during cryopreservation: Reduction of aggregation and improvement of emulsifying properties19
Exergy, economic and environmental analysis of organic Rankine cycle based vapor compression refrigeration system19
Optimal chiller loading by improved parallel particle swarm optimization algorithm for reducing energy consumption19
Experimental evaluation of R32, R452B and R454B as alternative refrigerants for R410A in a refrigeration system19
Experimental investigation of the solid desiccant dehumidification system with metal organic frameworks19
Coupled effect of operation conditions and refrigerant charge on the performance of a transcritical CO2 automotive air conditioning system19
Comparison of R404A condensation heat transfer and pressure drop with low global warming potential replacement candidates R448A and R452A19
Modelling the performance of a new cooling unit for refrigerated transport using carbon dioxide as the refrigerant19
Experimental determination of the optimum working conditions of a commercial transcritical CO2 refrigeration plant with a R-152a dedicated mechanical subcooling.19
Thermophysical properties of a phase change dispersion for cooling around 50 °c18
Improving the performance of household refrigerating appliances through the integration of phase change materials in the context of the new global refrigerator standard IEC 62552:201518
Selecting a cryogenic cooling system for superconducting machines: General considerations for electric machine designers and engineers18
Flow boiling heat transfer and pressure drop data of non-azeotropic mixture R455A in a horizontal 6.0 mm stainless-steel tube18
Experimental performance analysis of a packaged R290 refrigeration unit retrofitted with R170 for ultra-low temperature freezing18
Experimental study of R290/R600a mixtures in vapor compression refrigeration system18
Boiling heat transfer mechanism of environmental-friendly refrigerants: A review18
Performance analysis of ternary azeotropic mixtures in different vapor compression refrigeration cycles18
Numerical investigation on the condensation of R134a, R1234ze(E) and R450A in mini-channels18
Thermodynamic study of carbon dioxide transcritical refrigeration cycle with dedicated subcooling and cascade recooling18
Experimental evaluation of the dehumidification performance of a metal organic framework desiccant wheel18
A combined cooling and power cogeneration system by coupling duplex free-piston stirling cycles and a linear alternator18
Maxsorb III/HFC404a as an adsorption pair for renewable energy driven systems18
Viscosity of binary refrigerant mixtures of R32 + R1234yf and R32 + R1243zf17
Theoretical performance comparison for two-stage auto-cascade refrigeration system using hydrocarbon refrigerants17
Vacuum insulation panels for refrigerators17
Condensation heat transfer of R1234ze(E) and its A1 mixtures in small diameter channels17
Environmental impact assessment of R-152a as a drop-in replacement of R-134a in a domestic refrigerator17
Upstream and downstream injection effects on R134a economized vapor injection heat pump system at low temperatures for electric vehicles17
Comparison and analysis of two processes for BOG re-liquefaction in LNG carrier with normal-temperature compressor17
Thermodynamic Characteristics and Order Degree of Air Cycle System17
Performance improvement and comparisons of CO2 based adsorption cooling system using modified cycles employing various adsorbents: A comprehensive study of subcritical and transcritical cycles17
Dynamic performance analysis of inverter-driven split air conditioner17
A review of experimental studies on cylindrical two-phase closed thermosyphon using refrigerant for low-temperature applications17
Approaching optimum COP by refrigerant charge management in transcritical CO2 heat pump water heater17
Experimental investigation of PCM location in a commercial display cabinet cooled by a transcritical CO2 system17
Prospect of solar-driven ejector-compression hybrid refrigeration system with low GWP refrigerants in summer of Guangzhou and Beijing17
Heat transfer characteristics of phase change emulsions with solidification of phase change material particles in a circular tube17
Analysis of hybrid compression absorption refrigeration using low-GWP HFC or HFO/ionic liquid working pairs17
Evaluating R450A as a drop-in replacement for R134a in household heat pump tumble dryers17
An innovative environmental parameter: Expanded Total Equivalent Warming Impact17
Toward sustainable refrigeration systems: Life cycle assessment of a bench-scale solar-thermal adsorption refrigerator16
Experimental investigation on the influence of ejector geometry on the pull-down performance of an ejector-enhanced auto-cascade low-temperature freezer16
Influence of piston displacement profiles on the performance of a novel dual piston linear compressor16
Alternative positions of internal heat exchanger for CO2 booster refrigeration system: Thermodynamic analysis and annual thermal performance evaluation16
Thermal-economic-environmental analysis on household refrigerator using a variable displacement compressor and low-GWP refrigerants16
Effect of water ice-glazing on the quality of frozen swimming crab (Portunus trituberculatus) by liquid nitrogen spray freezing during frozen storage16
Effects of different thawing methods on quality of unfrozen meats16
Study on thermodynamic and environmental effects of vapor compression refrigeration system employing first to next-generation popular refrigerants16
Triple point measurements for new low- global-warming-potential refrigerants: Hydro-fluoro-olefins, hydro-chloro-fluoro-olefins, and trifluoroiodomethane16
Study on a novel looped heat-driven thermoacoustic refrigerator with direct-coupling configuration for room temperature cooling16
Traveling-wave thermoacoustic refrigerator for room temperature application16
Analysis of frost thickness and roughness growth from the perspective of frost crystal structure16
Single-phase flow distribution in plate heat exchangers: Experiments and models16
Drop-in analysis of R450A and R513A as low-GWP alternatives to R134a in a water-to-water heat pump16
Gradient porosity distribution of adsorbent bed for efficient adsorption cooling16
Air cooling techniques and corresponding impacts on combined cycle power plant (CCPP) performance: A review16
Experimental evaluation of zeotropic refrigerants in a dedicated mechanical subcooling system in a CO2 cycle16
A control method using adaptive setting of electronic expansion valve for water chiller systems equipped with variable speed compressors16
Prediction of critical properties and boiling point of fluorine/chlorine-containing refrigerants16
Experimental and numerical study on heat transfer of gas cooler under the optimal discharge pressure16
Falling film evaporation in a triangular tube bundle under the influence of cross vapor stream16
Hybrid two–stage СО2 transcritical mechanical compression–ejector cooling cycle: Thermodynamic analysis and optimization15
Vapor-liquid equilibrium measurements for 5 binary mixtures involving HFO-1336mzz(E) at temperatures from 313 to 353 K and pressures up to 2.735 MPa15
Experimental characterization of a novel configuration of thermoelectric refrigerator with integrated finned heat pipes15
Investigation of a new hybrid fuel cell–ThermoElectric generator–absorption chiller system for combined power and cooling15
A novel hybrid frost detection and defrosting system for domestic refrigerators15
Performance evaluation and comparative analysis of trans-critical CO2 booster refrigeration systems with modified evaporative cooled gas cooler for supermarket application in Indian context15
Parametric optimization of earth-air heat exchangers (EAHEs) for central air conditioning15
Experimental study on the influence of trifluoroiodomethane on the flammability of difluoromethane and propane15
Research on the refrigerant distribution and distinctive flow phenomena in a two-phase loop thermosyphon through a holistic visualization method15
A hybrid deep forest approach for outlier detection and fault diagnosis of variable refrigerant flow system15
A comprehensive review of life cycle climate performance (LCCP) for air conditioning systems15
Fault detection and diagnosis in refrigeration systems using machine learning algorithms15
Experimental investigation on ducted hot aisle containment system for racks cooling of data center15
An enhanced fault detection method for centrifugal chillers using kernel density estimation based kernel entropy component analysis15
Experimental and numerical analysis of a helical coil heat exchanger for domestic refrigerator and water heating15
Impact of hysteresis on caloric cooling performance15
Experimental and numerical investigation of energy separation in counterflow and uniflow vortex tubes15
Optimum operational strategies for a solar absorption cooling system in an isolated school of Mexico15
Fresh air humidification in winter using desiccant wheels for cold and dry climate regions: Optimization study of humidification processes15
Free cooling potential for Brazilian data centers based on approach point methodology15
Experimental investigation of a part air dehumidification cascade-like heat pump drying system15
Impact of micro-grooves in scroll wrap tips on the performance of a trans-critical CO2 scroll compressor15
Comparative analysis of microfin vs smooth tubes in R32 and R410A condensation14
Design and analysis of CO2 cryogenic separation process for the new LNG purification cold box14
Development of a new moving magnet linear compressor. Part A: Design and modeling14
Validated numerical model of heat transfer in the forced air freezing of bulk packed whole chickens14
Effect of pre-chilling time on the physicochemical properties of channel catfish during frozen storage14
A two-stage vertical absorption heat exchanger for district heating system14
Advancements on mechanically driven two-phase cooling loop systems for data center free cooling14
Correlations for liquid thermal conductivity of low GWP refrigerants in the reduced temperature range 0.4 to 0.9 from saturation line to 70 MPa14
Thermodynamic analysis on a modified auto-cascade refrigeration cycle with a self-recuperator14
Analysis of real gas equation of state for CFD modelling of twin screw expanders with R245fa, R290, R1336mzz(Z) and R1233zd(E)14
Investigation on the efficiency degradation characterization of low ambient temperature air source heat pump under partial load operation14
Vapor-liquid equilibrium measurements for the binary mixtures of pentafluoroethane (R125) with 2,3,3,3-Tetrafluoroprop-1-ene (R1234yf) and 3,3,3-Trifluoropropene (R1243zf)14
Effect of fin design parameters on the performance of a two-bed adsorption chiller14
Heat transfer optimization through new form of pin type of finned tube heat exchangers using the exergy and energy analysis14
Saturated vapor pressure and gaseous pvT property measurements for 3,3,3-trifluoroprop-1-ene (R1243zf)14
Experimental investigations on the performance of mini-channel evaporator refrigeration system for thermal management of power batteries14
Review of vapor compression refrigeration in microgravity environments14
The effects of the novel home freezing system on microstructure, color, antioxidant activity, and microbiological properties of strawberries14
Predictions of thermodynamic properties and phase equilibria of refrigerant systems with COSMO approaches14
Numerical study of a Phase Change Material (PCM) embedded solar thermal energy operated cool store: A feasibility study14
Thermal resistance-capacitance network model for fast simulation on the desiccant coated devices used for effective electronic cooling14
An analytical method for ensuring the optimal circulating composition of the multicomponent refrigerant mixture in a steady-state operation mode of the Joule-Thomson refrigerator operating with mixtur14
Performance evaluation of ice plant operating on R134a blended with varied concentration of Al2O3SiO2/PAG composite nanolubricant by experimental approach14
Experimental study of energy separation in a Ranque-Hilsch tube with a screw vortex generator14
A novel defrosting initiation strategy based on convolutional neural network for air-source heat pump14
Techno-economic control strategy optimization for water-source heat pump coupled with ice storage district cooling system14
Experimental investigation on the solubility of R290 in two mineral oils14
Experimental study on the operating characteristics of a display refrigerator phasing out R134a to R1234yf13
Numerical Study on the Effect of Nozzle Incident Angle on the Overall Performance of Gas Wave Refrigerator13
Performance Analysis and Limiting Parameters of Cross-flow Membrane-based Liquid-desiccant Air Dehumidifiers13
A novel hybrid solid sorption-compression refrigeration technology for refrigerated transportation and storage13
CFD simulation of liquid desiccant dehumidifier performance with smooth and rough plates13
Experimental study on flow boiling heat transfer and pressure drop of R245fa/R141b mixture in a horizontal microfin tube13
Theoretical performance evaluation of ejector and economizer with parallel compression configurations in high temperature heat pumps13
CFD simulation of vortex flashing R134a flow expanded through convergent-divergent nozzles13
Comparative analysis of a few novel multi-evaporator CO2-NH3 cascade refrigeration system for seafood processing & storage13
Experimental investigation on the pull-down performance of a -80°C ultra-low temperature freezer13
Condensation heat transfer and pressure drop characteristics of Isobutane in horizontal channels with twisted tape inserts13
Falling-film evaporation over horizontal rectangular tubes: Part I—Experimental results13
Separate sensible and latent cooling: Carnot limits and system taxonomy13
Comprehensive evaluation of the transcritical CO2 ejector-expansion heat pump water heater13
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