Heating Zone Research Articles

The influence of different geothermal distributions on the pressure transients of high-speed trains passing through tunnels

In this paper, experiments and numerical simulations are used to study the pressure wave transient laws, propagation characteristics and dynamic temperature field changes in tunnels located near geothermal hot springs. To simulate different temperature distributions, areas of 0–80 m, 80–160 m, 160–240 m and 270–350 m are heated, and the tunnel pressure wave peak value and train surface pressure wave peak value are studied accordingly. The research shows that when the heating zone is 0–80 m, the influence on the initial pressure wave is the greatest, the change rate is 8–10 %, and the initial expansion wave change rate is 5–10 %. When the heating zone is 80–160 m, there is little change in the pressure wave peak value in the first and second stages, and the expansion wave peak value is larger than the normal temperature in the third stage. When the heating zone is 160–240 m, the change rate of the pressure wave peak is small. When the heating zone is 270–350 m, there is a negligible change in the initial compression wave and expansion wave peaks in the first and second stages, and the change rate in the third stage is 2–4 %. Moreover, the heating zone located in front of the tunnel has a greater impact on the pressure at the tip of the train's nose, and the heating zones located in the middle and end of the tunnel have little effect on the initial positive peak value of the train pressure wave but a greater effect on the negative peak value. This study explores the influence mechanism of different geothermal distributions on pressure waves, which can provide more accurate boundary data for improving passenger comfort and the train thermal structural performance in high-temperature tunnels.

Occupant behavior effects on energy-saving measures and thermal comfort in severe cold areas

The complexity of human behavior is often underestimated when evaluating building heating energy consumption, especially in severe cold areas. Therefore, this study aimed to examine the heating energy consumption and thermal comfort of different modes of occupant behaviors by focusing on Inner Mongolia, a cold region, as the research object. Using the results of a questionnaire survey to determine the activity of typical families in this region, five occupant behavior models were constructed. On this basis, simulations were conducted to determine the energy consumption of different behavior patterns using DeST-h software. The findings show that the effect of energy savings is much more significant than the loss of thermal comfort. However, not all energy-saving measures are effective, as different external temperatures cause differences in the energy consumption results of varying behavior patterns. Specifically, when the outside temperature is high, excessive energy-saving behavior is not effective for overall energy savings, and when the outside temperature is low, energy-saving actions, such as indoor heat preservation and zone temperature control, provide significant results. On this basis, strategies were identified to achieve a balance between energy-saving measures and thermal comfort in buildings using gas wall-hanging furnaces in cold region areas.

Experimental study on failure of the scratched engine intake pipe under high temperature air burning

Air intake pipe is located in high temperature region of aeroengine, the leak caused by high temperature gas burning is a possible failure mode. In this paper, the tolerances of working pressures and high-temperature air burning of the intake pipe were experimental investigated. A pipe flame burning test bench with double zone heating and air pressurization was designed, which simulated the working temperature (382°C), air pressure (static and transient) and high temperature burning (500°C, 800°C and 1000°C for 3 minutes respectively) simultaneously. In these circumstances, the tolerance performances of the pipe with or without scratches was compared. There were bulge and multiple microcracks at the burning failure of all pipes. The results showed that the burning failure temperature and time of the scratched pipe were less than those of the intact pipe. The burning failure temperature of the scratched pipe was lower than 1000°C (about 940 ∼ 980°C), and corresponding failure time is less than 3 minutes. The failure mechanism under burning was obtained by the micro morphology of fracture. It provides a reference for fault evaluation and reliability analysis of engine intake pipeline.

Increased hydraulic resistance in tubes of once-through boiler due to fouling: A case study of 650 MWe ligite fired unit

The analysis of pressure changes in water and steam flow along the entire once-through steam boiler tube system at the 650 MWe lignite fired Unit was carried out after the long operational period of almost 30 years without a chemical cleaning of the pipe system. A significant increase of the hydraulic resistance was recorded in comparison to the design values in the evaporator tubes, both in the water heating zone and in the evaporation zone with the two-phase mixture flow. The cause of this adverse effect is the formation of a wavy surface of the magnetite layer deposited on the inner wall of tubes. The significantly increased absolute roughness on the inner wall of tubes was determined on the basis of measured pressure drops at sections of the tube system and numerical calculation performed with a thermal-hydraulic model of single-phase and two-phase water and steam tube flows. The model is based on the steam-water two-fluid model with mass, momentum and energy balance equations and mechanistic correlations for the steam-water interface transfer processes. The model is suitable for the single and two-phase flow parameters prediction in the span from subcritical to supercritical and near critical pressure conditions. Conducted calculations provide detailed insight in the fluid pressure, velocity and temperature change in the boiler tube system. After the long operational period the pressure drop in evaporating tubes almost doubles in comparison to the design values. The presented results are a support to boiler's design, operational procedures and maintenance.

A real-time cost optimization of two-section oven system with discrete gradient extremum seeking control: An experimental study in iron and steel industry

The heavy industry plants are focused on finding ways to minimize energy costs, which is one of the most significant costs of production. In this paper, a case study on a real oven system used in a steel strip production line is performed. Oven systems consume different types of energy simultaneously. Therefore, energy cost optimization is a good case study for the oven systems. The real oven system studied in the present study consists of two sections with eight heating zones. A natural gas burner and a recirculation fan with a power of 45 kW are installed in each zone for continuous heating of steel strips. We improved Discrete Gradient Extremum Seeking Control (DGESC) in the oven system without changing the oven structure and its built-in burner controller and optimized the fan speeds so that the total cost of the heating process is minimized. The improved DGESC was evaluated during steel strip production with the constraints related to the oven safety, measurement device characteristics, and delays for stabilization. The measure of energy consumption was obtained from the oven automated software and compared with the consumption when using the oven manufacturer’s recommended settings. At the end of the production, the improved DGESC strategy showed that the same output can be produced with less cost at different operating speeds of the fans. In particular, the total cost of the electrical energy and natural gas was reduced by 3.44% when using 78% of fan speed instead of using 70% recommended by the manufacturer. The promising results of the improved DGESC can be further enhanced by upgrading the oven system for individual measurements.

CO2 laser-assisted sintering of TiO2 nanoparticles for transparent films

Nanoelectrospray laser deposition (NELD) of nanoparticles (NPs) on various substrates has attracted considerable attention as a fast, cost-effective, and scalable technique for precise control of heating time and zone. In this work, NELD-assisted sintering of titanium dioxide (TiO2) NPs on borosilicate glass and quartz substrates is addressed. A 10.6μm CO2 laser was used for patterning and sintering titania nanoparticles in ambient air. The effects of laser dose and deposition process parameters on the morphological, structural, and optical characteristics of the sintered TiO2 patterns were characterized using optical microscopy, scanning electron microscopy, and x-ray diffraction. The results point out that the anatase phase was preserved after laser sintering, without the appearance of any TiO2 rutile traces. We show that the improvement in the morphological properties of TiO2 patterns is due to the laser sintering of a dense layer of ceramic with enhanced interconnectivity and connection between single nanoparticles. A theoretical model was developed to select the temperature required to sinter TiO2 nanoparticles and to correlate it with the laser power and scanning speed to prevent cracking on the substrate and sintered nanoparticles and also to get transparent TiO2 films. An optical transmittance of ∼91% was achieved. The experimental data were in accordance with the theoretical model, predicting the success of the model.

МАТЕМАТИЧЕСКАЯ МОДЕЛЬ ТЕПЛООБМЕНА В ЗОНЕ ЛОКАЛЬНОГО ОБОГРЕВА С ПОМОЩЬЮ ПЛЁНОЧНЫХ ЭЛЕКТРОНАГРЕВАТЕЛЕЙ НА ОСНОВЕ БИОТЕРМИЧЕСКОЙ МОДЕЛИ ЖИВОТНОГО

The article shows the widespread use of film electric heaters today, as a generator of thermal radiation in the heating systems of young animals. As a rule, this heating system is local, that is, the system provides for maintaining comfortable temperature conditions directly in the cage or den of the animal, which contributes to the proper development of its body, especially in the early stages. In this regard, it is important to correctly calculate the parameters of such a system so that the animal is first of all comfortable, and secondly, it is effective in terms of energy costs. The article analyzes several calculation methods, such as the method of markers and cells, the method of finite differences, the run-through method, the advantages and disadvantages of these methods are given. To obtain a mathematical model, a direct run method was chosen in the format «vortex – velocity – current function – temperature», since this method is not affected by the type of boundary conditions that take into account the dependences on the biophysical characteristics of the heated animals and the configuration of the heating zone. The result of the study is the structure and block diagram of a mathematical model for calculating the temperature field, which allows taking into account the heat released by animals, which will allow more accurately calculating the temperature field in the heating zone, the only drawback of which is the inability to take into account the work of ventilation systems and drafts that organize the movement of air in the heating zone.

Reflow Recipe Establishment Based on CFD-Informed Machine Learning Model

This article proposes a computational fluid dynamics-based machine learning (ML) model to set the temperature of a convection reflow oven and control conveyor speed. Due to the thermal mass variation of printed circuit boards (PCB) and surface mount components, the reflow recipe should be specified for each PCB assembly individually. Instead of relying on process engineers’ skills and experience, the machine learning model supported by heat transfer mechanisms provides a clear and logical path in the reflow recipe setup. An ideal recipe should let the largest component reach the minimum reflow temperature, meanwhile, the temperature cannot damage the small or heat-sensitive components. To simulate the reflow soldering process, the computational fluid dynamics (CFD) model was used after being validated with experiment results. A system was programmed to feed the output of the CFD model as the input to the ML model. Benefiting from the interpolation and fast response brought by ML models, we can rapidly obtain the results subjected to millions of recipes, which are the combination of preset temperatures of all the heating zones and the conveyor speed in the oven. Using a weighting filter function, the optimal recipe can be obtained. This methodology is especially beneficial to reflowing smaller batches of complex PCB assemblies with a big heat capacity.

Soft Sensor Model for Billet Temperature in Multiple Heating Furnaces Based on Transfer Learning

Billet heating temperature directly affects the quality of the billet, but the existing technology cannot measure the billet surface temperature. Therefore, we accurately predict the temperature of the furnace by a soft sensor to approximate the billet temperature. Limited by the complexity of the heating process and the lack of computing resources in factories, the existing research pays little attention to or even cannot meet the temperature prediction requirements of multiple heating zones in multiple heating furnaces. To address the above problems, we propose a temperature prediction method for multi-heating furnaces based on transfer learning and knowledge distillation. The method establishes a multisource domain model of a source domain furnace on a cloud platform. Then, the multisource knowledge is transferred to the target domain heating furnace, and the target domain teacher model is established by fine-tuning the source domain model through the target domain data. Next, to efficiently predict the furnace temperature, a shallow multi-task student model is established at the edge server to predict multiple heating zones in the target furnace. Furthermore, a knowledge distillation method for regression prediction is proposed so that the student model can improve the prediction accuracy under the guidance of the cloud teacher model. The effectiveness of the method is verified by experiments on 20 different heating zone datasets in two heating furnaces and two wind turbine datasets. The consistency of multiple experiments shows that this method can not only improve the accuracy by transferring the source domain knowledge but also reduce the size of model parameters by knowledge distillation on the premise of meeting the requirements of prediction error.

SIMULATION OF THE THERMAL MODE IN THE PIGLETS’ LOCATION AREA WHEN USING AN IR IRRADIATION PANEL

It has been shown that the efficiency of engineering systems for creating a microclimate at livestock facilities is determined by the possibility of organizing the required thermal conditions in interaction with external temperature parameters of enclosing structures. (Research purpose) The research purpose is developing a method for calculating and modeling the thermal mode in the piglets’ location zone using an infrared irradiation panel in a system of diffusely absorbing and radiating surfaces. (Materials and methods) Considered the conditions of a comfortable thermal regime for young animals, the physical model of a piglet, the conditions of heat exchange. The areas of temperature change of the irradiating panel and the influence of the configuration of the optical characteristics of the system shell when creating comfortable conditions for keeping piglets, depending on the age and temperature parameters of the enclosing structures, were presented. (Results and discussion) It was found that the computational model of heat transfer of an animal on the example of a piglet in a system of isothermal diffusely absorbing and radiating surfaces serves as an extension of existing computational methods. (Conclusions) It has been shown that the mathematical model of heat exchange of an animal in a system of diffusely absorbing and radiating surfaces more fully reflects the interrelationships in the elements of the biotechnical system, this allows more accurately forming and maintaining the specified temperature conditions for the comfortable maintenance of young animals. We have obtained a functional model reflecting the dependences of the thermal state of piglets, taking into account their age, on the ambient temperature, the design parameters of the radiating panel and its temperature on the surface. The main correlations linking the conditions of thermal comfort of piglets with the temperature of the radiating surface of the panel, with the temperature and optical properties of the enclosing structures of the room were revealed. The scheme of the algorithm for calculating the surface temperature of the radiant panel was given. The range of panel surface temperature values was determined depending on the temperature of the enclosing structures for the conditions of a comfortable thermal condition of animals in the heating zone, taking into account their age.

Normal Zone Propagation and Heating under Current Overload in High-Temperature Superconducting Tapes with Epoxy Coating

Normal Zone Propagation and Heating under Current Overload in High-Temperature Superconducting Tapes with Epoxy Coating

Вплив форми гравітаційної теплової труби з різьбовим випарником на її теплопередавальні характеристики

The modern development of electronics is associated with the problem of reducing the mass and size of the equipment while increasing its power. This leads to an increase in the temperature of both individual elements and the device as a whole, which contributes to a decrease in equipment reliability. This makes the development of inexpensive yet efficient cooling systems an urgent task. One of the ways to solve this problem is to use heat pipes of a new simplified design in cooling systems. This article compares the thermal characteristics of a cylindrical copper gravity heat pipe with a threaded evaporator before and after flattening. The working fluid used in the experiment was R141b. Experimental studies were conducted at two tilt angles relative to the horizontal under the conditions of forced convection cooling of the condensation zone. The influence of the change in the shape of the body from cylindrical to flat on the temperature in the heating zone of the heat pipe, thermal resistance, and heat transfer coefficients in the evaporation and condensation zones was shown in the range of heat power from 5 to 70 W. The choice of the heat pipe is justified based on the maximum thermal loads of electronic components and the orientation of the cooling system in space. Changing the shape of heat pipe from cylindrical to flat leads to a decrease in the maximum thermal power transmitted, but a flat heat pipe shape is more technologically feasible for use in cooling systems of electronic equipment.

An analytical model for reservoir temperature during electromagnetic heating based on power transmission

• An analytical solution for reservoir temperature during EM heating is derived. • Power transmission through the multilayers in the wellbore is investigated. • A simple method is proposed to estimate the energy absorption number. • An effective heating zone is defined to evaluate the thermal efficiency of EM heating. Electromagnetic (EM) heating for heavy oil extraction has been recognized as an eco-friendly and economical thermal technique to enhance oil recovery (EOR). This work constructs an analytical model to identify the reservoir temperature distribution based on power transmission during EM heating. For homogenous and isotropic reservoirs, governing equations of the reservoir temperature reduce to a one-dimensional radial heat transfer model by neglecting heat convection. The heating source is derived from Maxwell’s equations, and the amount of power transmitted into the reservoir is estimated by the transfer matrix method. Analytical solutions to the reservoir temperature are in the form of Bessel’s functions, which agree well with the numerical method and are close to experimental data. Further calculations show that the Beer-Lambert power form would underestimate the temperature near the wellbore by about 59% compared to Maxwell’s equations. The transmitted power increases with the wave frequency for the air-filled annulus but decreases when the annular fluid is water or completion fluid. High frequencies (> 1 GHz) would produce a satisfactory power ratio for the air-filled annulus, while moderate frequencies (∼ MHz) are proper for the water- or completion fluid-filled annuli. Thickening the non-metallic sleeve could enhance the power transmission. The current model also proposes a simple method to estimate the energy absorption number by the asymptotic solution for a long time. The analytical solution demonstrates that the thermal penetration depth defined by the diffusion front is independent of the wave frequency. On the contrary, the effective heating zone, reflecting the influence of the frequency and heating time, is a better indicator to evaluate the thermal efficiency of EM heating. The obtained solutions would help engineers estimate the reservoir temperature fast, optimize the frequency of the heater, and assess the efficiency of EM heating.

ИССЛЕДОВАНИЕ И МОДЕЛИРОВАНИЕ ПРОЦЕССА ПЛАЗМЕННОЙ ЗАКАЛКИ СТАЛИ 40Х

In this paper, the results of research and modeling of the process of plasma hardening of specimens from steel 40Kh are presented. Using experimental data on the size of hardening zones within the framework of thermophysical modeling, the effective radius and efficiency of the plasma arc are determined. The simulation of plasma surface hardening was carried out depending on the speed and current of the plasma arc. Based on the analysis, nomograms are proposed for determining the depth and width of the hardening zone of steel 40Kh depending on the speed and current of the plasma arc. Thermal cycles are constructed in the steel heating zone. The cooling rates of the material are determined depending on the speed of movement and the depth of hardening in comparison with the critical rate of steel hardening.

Теплопередавальні характеристики мініатюрних теплових труб для систем охолодження електронної техніки

Decrease in mass and dimensional characteristics of semiconductor devices with simultaneous increase in allocated power dissipation creates conditions of heat-loaded operation of the most critical elements of radio-electronic equipment. Such growth of heat flows requires effective small-size systems for maintaining safe temperature conditions of electronic equipment and its reliable functioning. The use of miniature heat pipes (MHP) commensurate in size with the microchip crystals can significantly reduce their temperature level of operation. The paper presents the experimental results of investigation of thermal resistance and maximum heat fluxes of miniature heat pipes with diameters from 3 to 6 mm and lengths from 150 to 300 mm with metal-fiber capillary structure. The porosity of the capillary structure varied from 70% to 88%. Water and ethanol were used as coolants. The study was carried out at different orientations of MHPs in space: vertical by gravity forces, horizontal, and vertical against gravity forces (+90°, 0°, –90°). It is shown that the heat transfer characteristics of the MHPs are affected by both geometric and mode factors. It is determined that the minimum thermal resistance and maximum heat flux significantly depend on the diameter of the vapor channel, porosity of the capillary structure and thermal physical properties of the heat transfer medium. The data on the heat transfer intensity in the heating zone depending on the size of the vapor channel are given. It is shown that decreasing the diameter of the vapor space of MHPs worsens their heat transfer characteristics.

Urban cooling island vs urban heat island, who is the winner? Study of the green spaces effect in coolingdown of urban heat in Kapanewon Depok, Sleman, Yogyakarta, Indonesia

Urban heat zone are the major problem affecting human health through the microclimatological effect. Green Spaces are like a natural air conditioners that can cool dense urban environments from hot air. The cooling effect of urban heat from the presence of Green Space is called the Urban Cooling Effect (UCE) while the cool air produced is called Urban Cooling Island (UCI). This research aims to analyze the extent to which UCI is able to neutralize UHI by urban cooling. This study of this research was conducted in Kapanewon Depok around the North Ringroad zone. In the research, the Remote Sensing method was used utilizing Landsat-8 and processed with ArcGIS to determine the patterns and dynamics of UCI and UHI and was equipped with field data measurement and interviews data using questionnaires. The results obtained were that the coldest and largest UCI Spot was at Babarsari Camping Ground, 27,777°C in 159,218 m2, with green space types consisting of shrubs, grass, plants, mixed trees and flowing river. Questionnaire results show that the majority of residents still feel hot. It was concluded that although Green Space is useful in cooling cities, but UCI VS UHI is still dominated by UHI’s influence.

Optimization of Wear Parameters of Cryogenic and Heat-treated Al 6101 Closed-cell Foam using Taguchi Technique

Objectives: This study deals with the optimization of wear properties of Al 6101-alloy foam treated with different temperature zones such as Untreated (UT), Heat Treated (HT), Cryogenic Treated (CT), and Cryogenic Heat Treated (CHT), respectively. The results of this study concerning confirmation tests enable us to validate the proposed optimization findings for the coefficient of friction and specific wear. Methods: The Al 6101 foam samples used in this study are exposed to different heat and cryogenic treatments as well as wear tests using the pin-on-disk apparatus setup with the Taguchi optimization technique. The wear parameters are enhanced further using the Analysis of variance (ANOVA) technique, and this model is processed using the MINITAB software. The Al 6101 foam samples are evaluated using important wear testing parameters like Heat Zone, Load (N), Speed (rpm), and Sliding Distance (m), as well as the output parameters such as coefficient of friction and specific wear (mm3/Nm). Findings: The optimum combination of the coefficient of friction and specific wear, according to the graphic and analytical results of Taguchi’s optimization, is with 40 N load, 400 rpm speed, and 1500 m distance for a cryogenic zone and 40 N load, 400 rpm speed, and 2000 m distance for a cryogenic heat zone, respectively. The interaction of sliding distance, load, and speed, which has probabilities of 17.42, 8.95, and 7.74, respectively, is followed by the coefficient of friction, which has a greater probability percentage of 48.01 for the heat zone. The ANOVA for the specific wear has a higher probability percentage of 48.82 for the load and is followed by the interaction of heat zone, sliding distance, and speed, which have probabilities of 37.59, 6.02, and 2.85, respectively. Novelty: Considering Al 6101 foam, which is mostly a nonferrous material, this experiment once again confirmed that novel cryogenic treatment has a noteworthy improvement in coefficient of friction and specificwear. Additionally, Taguchi’s optimization and ANOVA analysis proved that the Al 6101 closed-cell foam specimen in the CHT zone exhibited optimal results when compared with other heat zones. The results confirmed that the CHT processing improves the wear resistance of the Al 6101 closed-cell foam effectively when examined with other different heat zones. Keywords: Al 6101 ClosedCell Foam; Cryogenic Treatment; Taguchi Technique; Coefficient Of Friction; Specific Wear; Wear Graph; Surface Morphology; L16 Orthogonal Array; ANOVA

Optimization of Vacuum Forming Parameter Settings to Minimize Burning Defect on Strawberry Packaging Products Using the Taguchi Method

Packaging products are being developed by PT. ATMI IGI – Center. The process of making these products uses the Vacuum forming method. The packaging product is made of PP (Polypropylene) and is used to pack strawberries. There are several problems during the production process, one of which is that there are still product defects burning or often called burn marks. These problems are caused by the machining parameters that have not been standardized, and based on trial eror or experience of the operator. The vacuum forming machine used in this production is the Formech 508FS Vacuum Forming machine. The optimized parameters are heat zone, heat time, and stand by temperature. Optimizing these parameters using the Taguchi method, with an orthogonal array with 9 trials, and the selected signal to noise ratio (SNR) is smaller is better. The response of this research is the reduction of burn mark product defects. The results showed that to reduce burn mark product defects, is to set the parameter heat zone 1 by 90%, heating zone 2 is 80%, heating time 45s, and stand by temperature 60%. Based on this arrangement, the product defects obtained only reached 13%. PT. ATMI IGI-Center is expected to be able to use these parameter settings for the strawberry packaging production process.

INFLUENCE OF VARIOUS FACTORS ON THE HEAT TRANSFER CHARACTERISTICS OF MINIATURE TWO-PHASE THERMOSYPHONS WITH NANOFLUIDS

Currently, various types of nanofluids are of increasing interest as heat carriers for heat transfer in thermosiphons and other evaporative-condensation devices. This paper presents and analyzes experimental data on heat transfer characteristics (total thermal resistances, maximum transferable heat fluxes and equivalent thermal conductivity) of two-phase miniature thermosyphons with nanofluids. Geometric parameters of thermosiphons for all experimental samples were identical and were: total length 700 mm, inner diameter 5 mm. The length of the heating zone was changed stepwise from 45 mm to 200 mm. The length of the condensation zone was 200 mm for all investigated thermosyphons. The amount of coolant in the thermosiphons was the same, and its height in the heating zone before the start of the study was 88 mm. Distilled water and aqueous nanofluids with nanoparticles of carbon nanotubes, synthetic diamond, and carbon black were used as heat carriers. The main attention is paid to the study of the influence of the filling factor and the angle of inclination of the thermosyphon, the value of the transferred heat flux and the chemical nature of the coolant (nanofluid) on the heat transfer characteristics of thermosyphons. The strong influence of these factors on the efficiency of a miniature closed two-phase thermosyphon has been demonstrated. A more than twofold increase in the heat transfer characteristics of thermosyphons (the maximal transferred heat flux) was obtained with a sharp decrease in their thermal resistance. It is assumed that the significantly higher heat transfer capacity of such thermosiphons compared to those filled with water is explained not only by the higher thermal conductivity of the coolant, but also by the appearance of a peculiar porous structure that prevents the appearance of a vapor film and promotes the intensification of heat transfer processes during boiling. Bibl. 16, Fig. 10, Tab. 2.

Effects of Different Root Zone Heating Methods on the Growth and Photosynthetic Characteristics of Cucumber

Root zone heating can solve the problems associated with the yield and decline in the quality caused by low-temperature stress in cucumber during winter and early spring. An experiment was performed to investigate the effects of different heating methods on the root zone temperature, growth and photosynthetic characteristics, fruit quality, and yield of cucumber. Using traditional soil cultivation (CK1) and sand cultivation (CK2) in a greenhouse as the controls, four heating treatments were set up: soil-ridge sand-embedded cultivation (T1), water-heated soil cultivation (T2), water-heated sand cultivation (T3), and water-curtain and floor-heating cultivation (T4). The results indicated that heating treatments T2 and T4 had better warming and insulation effects than the other treatments during both day and night, with an average temperature increase throughout the day of 0.8–1.2 °C compared with CK1. The chlorophyll content of leaves under the T2 and T4 treatments increased, and the photosynthetic rate and the overall plant growth were significantly higher than in the other treatments. Compared with the control, the fruit yield increased most significantly under the T2 and T4; the soluble sugar, soluble solids, and Vc contents in the fruit increased; while the nitrate content in the fruit decreased, effectively improving the fruit’s quality and yield. It was finally determined that the T2 and T4 heating treatments are the most effective in solving the low-temperature problem. Moreover, as T2 consumed relatively more electricity, the use of a water-curtain and floor-heating system in winter and spring should be considered in order to boost the yield and improve the quality.