Temperature Of Room Research Articles

Comparison study of palm fibers in painting putty to reduce temperature conditions

A Composite is a combination of two or more materials that have different properties so that it becomes a new material with different properties. The materials used in this study were polyester putty and palm fiber. Composites are durable, rust-resistant, and very strong. The purpose of this study is to determine the tensile strength, analyze the surface of the specimen using a scanning electron microscope, and be able to reduce the temperature in the car room. In the manufacture of composite tensile test specimens, it refers to the A370 standard with a size of 200 mm x 20 mm x 3 mm. In the tensile test, the average maximum stress was 0.769 kgf/cm2 and the average yield stress was 0.755 kgf/cm2. The calorimeter test uses the ASTM D5865 testing standard so that the absorbed heat is 20.8269 oC. In testing the scanning electron microscope using the ASTM A673 testing standard with 1000 times magnification.

The Safety Monitoring System of University Laboratory Based on Cloud Platform

The unified laboratory fire monitoring system aims to centrally monitor laboratory environmental data across the province or even the country, perceive real-time changes in the laboratory's internal environment, accurately assess fire risks, and take timely disaster relief measures. In addition, once a fire occurs in the laboratory, an alarm message can be issued in a timely manner, which can better extinguish the fire in a timely manner to reduce losses or automatically take fire extinguishing measures to avoid the occurrence of a fire. For this purpose, this article designs a cloud platform university laboratory security monitoring system based on ZigBee. This system can monitor the temperature, humidity, and smoke concentration in laboratory rooms of different colleges and universities, and conduct safety monitoring of the rooms. When the monitoring values exceed the safety range, real-time alarms will be given. This system consists of four parts: terminal data acquisition module, ZigBee coordinator, ESP8266 wireless gateway communication module, OneNET cloud platform, and third-party web application. The system collects monitoring data in the laboratory through various sensors and wirelessly transmits the data to the cloud through ZigBee networking. The cloud then transmits the data to the web, thereby achieving real-time monitoring and alerting of the security situation in each laboratory. This article provides a human-machine interaction page on the local web end and a cloud platform monitoring interface. The effectiveness of the system is verified by the measured data validation.

Microclimatic HVAC system for nano painted rooms using PSO based occupancy regression controller

In this paper, PSO-OMRC model is proposed for heating ventilation and air conditioning (HVAC) system. The PSO-OMRC predicts SPT in HVAC for energy saving and thermal comfort of persons in room. PSO-OMRC used data collected from temperature, humidity, PIR, and thermal camera sensors in HVAC installed rooms for SPT prediction. In existing HVAC systems, SPT is constant and consumes more energy. Moreover, SPT prediction using traditional machine learning algorithms considers various parameters such as room temperature, humidity and person count in room. Existing algorithms considers the above parameters for energy saving in HVAC and thermal comfort for persons, whereas other parameters such as room walls and ceiling temperature, human body temperature need to be considered for SPT prediction and for energy saving in HVAC. The PSO-OMRC model predicts the SPT based on number of occupants and microclimatic conditions such as environment temperature, humidity, room wall temperature and ceiling temperature. From experimental results, the utilization of the thermal image occupant model provides significant energy savings in the PSO-OMRC model. In nano coated room, PSO-OMRC model is evaluated with the implementation of a thermal image occupant model to improve energy savings, resulting in approximately 25.2% of energy savings while maintaining the level of thermal comfort.

Thermal Performance of Horizontal Fixed Sun Shading Device

Earlier investigations on passive cooling methods applied software modelling, and the findings were not confirmed through field measurement. Hence, this study applied a stationary experiment on a real structure and weather conditions employing horizontal sun shading (SDH). The purpose of this study was to compare the performance of fixed passive sun-shading devices put on to the bare façade of three-story terrace shophouses in Malaysia. The experiment findings revealed that SDH significantly improved the internal thermal environment by lowering the average monthly indoor air temperature (Ta) by 0.98 K and the peak temperature by 2.11 K. SDH is also effective during the warmest sunny days, lowering 1.23 K on average for the day. Meanwhile, SDH reduced the temperature in the control room by 5.40 K during the warmest peak time.When it came to indoor mean radiant temperature (Tmrt), SDH performed better than the control room in the very hot peakover a month (2.38 K) and on the highest temperature of the day (7.70 K). Finally, it can be inferred that SDH worked better from late at night until early in the morning, cooling the room temperature faster. This quiescent choice is one of the best for enhancing a building's internal thermal performance while also possibly contributing to a decrease in operational energy consumption.

Recycling of waste marble powder and waste colemanite in ternary-blended green geopolymer composites: Mechanical, durability and microstructural properties

The objective of this investigation was to identify the effects of curing temperature, cement clinker aggregate, waste colemanite (WCM) and waste marble powder (WMP), as well as their interaction, on the early physico-mechanical properties, microstructure, and high-temperature resistance of geopolymer composites (GC). Ground granulated blast furnace slag (GBFS), metakaolin (MK), and silica fume (SF) were employed as precursors for the production of GC. These materials were activated using a solution of sodium hydroxide (NaOH) and sodium silicate (Na2SiO3). In the fabrication of the GC, fillers such as WMP, WCM, and cement clinker aggregate (CCA) were employed. Four GC mixes were generated and cured for 8 h at curing temperatures of ambient (20 °C), 60 °C, and 90 °C. Investigations were conducted into how curing temperature, WMP, and CCA affected the GC's compressive, flexural strength, water absorption, dry unit weight, porosity, and sorptivity. The resulting mixes' performance at high temperatures was also assessed. Using SEM, microstructure investigations of GC mixes made for the study were also carried out. The obtained results indicated that the mixture M2 containing 100 kg/m3 of WMP and 750 kg/m3 of CCA exhibited the greatest compressive strength of 24.60, 55.60 and 68.80 MPa at ambient, 60 °C and 90 °C respectively compared the other GC mixtures. Moreover, the compressive strength of the M1 mixture enhanced by 190.65% and 239.56%, at 60 °C and 90 °C respectively compared to ambient-cured samples. Ambient cured mixture M4 that contains maximum WBM and minimum CCA content exhibited the strength enhancement of 54.01, 46.52 and 29.95% at 150, 350, and 550 °C respectively.

Prototype Sistem Monitoring Exhaust Fan pada Dapur Huni Berbasis Mikrokontroler

The purpose of this research is to detect the room temperature in the residential kitchen when the temperature of the residential kitchen becomes hot and to detect if there is smoke in the residential kitchen. The problem faced is because many residential kitchens in Indonesia have one or more stoves for cooking, which causes the temperature in the residential kitchen room to turn hot and cause smoke from the cooking. To overcome this problem, an Exhaust Fan is needed as an air conditioner so that the temperature remains stable. The method used in this research is quantitative by measuring the results of measurements and testing the percentage of errors. The results of the study found that the overall tool was working properly, measurements at component points had obtained results and the percentage of errors was not more than the maximum error, comparison of the output results on the Pzem-004t sensor and multitester had been measured with an error level not exceeding the maximum error, it can be concluded that the Pzem-004t sensor has good accuracy, and comparisons in point measurements using a multitester and on an LCD with an error level that does not exceed the error limit and have an accurate level of accuracy..

Influence of Firefighting Intervention on Fire Spread Characteristics in Ship Engine Room

The purpose of this paper is to investigate and evaluate the ship engine room fire spreading characteristics based on the effect of firefighting interventions. The large eddy simulation (LES) and theoretical models are employed to simulate a fire scene in the engine room. The fire spreading characteristics and the mechanism of the use of a fine water mist are obtained by varying the ventilation conditions and parameters of the water sprinkler. The results show that the reason why a pool fire can be more easily extinguished as the spray speed increases is because the water mist with a higher spray speed has a larger spray area. Meanwhile, the temperature in the engine room would drop more rapidly with the increasing spray area due to the higher evaporation rate. Furthermore, the arrangement of the ventilation conditions had an obvious effect on the fire spreading characteristics, as the depletion of the combustion medium affects the combustion situation.

Simulation and Experimental Study on the Use of Ventilation Air for Space Heating of a Room in a Low-Energy Building

In thermally modernised buildings, sharing of ventilation heat loss becomes more significant. In the case of the application of ventilation with heat recovery, especially during transitional periods, there arises a question of whether an air system makes it possible to maintain the required indoor air temperature without the necessity of using a basic hydronic heating system. This paper presents the application of a simple thermal network model of a building zone to simulate indoor air temperature in a single room of a multi-storey building with a mechanical ventilation system with heat recovery. Ventilation air was supposed to be the only heat source and its ability to maintain the required indoor air temperature was checked in simulations and then compared with measurements. The 5R1C thermal network model of a building zone was used for simulations. Comparison with measurements showed the Mean Absolute Error (MAE) and Root Mean Square Error (RMSE) of indoor air calculation to be 2.37 °C and 2.45 °C, respectively. When including heat flux from the bottom storey through the floor, MAE = 1.28 °C and RMSE = 1.38 °C were obtained.

Study on heat exchange of groundwater under complex geological conditions in karst area of south China

This paper takes a groundwater source heat pump in the region as the research object and based on field research, experimental tests combined with comparative analysis, the data on its operation is monitored and analyzed in terms of operation, energy saving, and environment. The results show that the cooling temperatures of the test rooms were all below 26°C, the average coefficient of performance of the units was 4.61–4.93 and the average coefficient of performance of the system was 3.08–3.27. In addition, compared to conventional water-cooled chillers, 466 tons of standard coal could be saved in one cooling season, resulting in a reduction of 1,150.8 tons of carbon dioxide emissions, 9.3 tons of sulfur dioxide emissions and 4.7 tons of dust emissions The savings in operating costs are 793,000 RMB. This shows that the groundwater source heat pump has good energy efficiency and economy. The research results obtained in this paper provide a reference for improving energy efficiency and optimizing the operation of the groundwater source heat pump system. It is of great significance to the application of groundwater source heat pump systems in areas with complex geological environments.

Prototype of a Baby Incubator Physical Parameter Measurement Tool: Temperature, Humidity, Airflow and Noise Level

The Incubator Analyzer is equipment to measure the physical parameters contained in the baby incubator to verify the output value of the device and ensure the safety of the equipment for patient care. Currently, there are several products of baby incubator analyzer in Indonesia, but the availability of goods is still imported with relatively expensive product prices, so in this article, we report the development of a prototype baby incubator physical parameter measurement equipment to support the domestic product independence program. The method that has been carried out in this research is experimental in designing and developing a baby incubator physical parameter by maximizing the availability of components in the local market. Design of the prototype refers to SNI IEC 60601-2-19-2014 which is a standard of special requirements for basic safety and essential performance of infant incubators, with the measured parameters consisting of measurements of air temperature in the incubator room, mattress temperature, humidity, airflow, and noise level. The temperature measurement design uses a resistive temperature detector PT 100, SHT 11 as a humidity sensor, GFS131 as an airflow sensor, MAX4466 as a microphone amplifier as a sound sensor, and a 3.5” nextion TFT LCD as a display. This prototype is also equipped with a rechargeable battery system as a portable power supply. The testing is carried out by comparing the results read by a device designed with the Incu Analyzer II Fluke Biomedical. The results show that the prototype of the baby incubator parameter measuring instrument is able to read the values of temperature, humidity, airflow, and noise level in the baby incubator chamber. The accuracy of temperature parameter measurement reaches more than 98%, so this prototype has the potential to be tested by authorized institutions.

Efektivitas Media Lilin Aromaterapi Berbahan Daun Pala (Myristica fragrans Houtt) dalam Mematikan Nyamuk Aedes aegypti

Dengue fever is transmitted through the bite of a female mosquito that stores the dengue virus in its eggs, then the virus will be transmitted to humans through bites. The right way to control the spread of Dengue Fever is to control the vector population through the use of bioinsecticides whose basic ingredients come from plants containing chemicals that are toxic to insects. This study aims to determine the effectiveness of aromatherapy candle media made from nutmeg leaf (Myristica fragrans houtt) in killing the Aedes aegypti mosquito. This research uses experimental research with post test only group control design method. The number of samples used in one experiment was 50 Aedes aegypti mosquitoes. This research process uses palm wax wax media, and the composition of nutmeg leaf powder is 50 grams and wax is 100 grams. The results showed that for 12 hours every 2 hours the number of dead mosquitoes was monitored, the average number of mosquitoes that died with 3 trials was 60% experiment, while external factors, namely temperature and humidity measurements in both rooms did not affect the mortality of mosquitoes.

EN PRENSA. Graphical-mathematical model to estimate CO2 concentration level as an indicator of SARS-CoV-2 transmission. EN PRENSA

The first documented cases of Coronavirus disease of 2019 (COVID-19) in Wuhan city (Hubei province, China) were caused by Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2), studies mention viral transmission is more common in indoor and poorly ventilated environments compared to outdoor environments or environments with abundant airflow. In this context, this research aimed to estimate, through a mathematical model by a Box-Behnken design, the time and occupancy required in a physical space to reach CO2 levels that exceed the risk level established as a safer condition of 700 ppm for SARS-CoV-2 transmission. According to the proposed mathematical model, it is possible to predict safe conditions. With this, it was found that natural ventilation is the best option to reduce CO2 concentration, considering the occupancy/m3 and time, allowing a constant airflow; the use of air conditioners to control the temperature in rooms without natural ventilation is suggested; notwithstanding, these types of equipment are not designed to reduce CO2 concentration. Thus, their use in rooms with open windows and doors leads to a shorter equipment lifetime, for this reason, its operation in special conditions, such as in rooms without natural ventilation should be considered.

Prototype of Room Temperature and Humidity Monitoring Device in Shallot Storage Using Microcontroller Arduino

Allium ascalonicum L or commonly referred to as shallot is one type of horticultural plant that is important because it is widely used by humans as a mixture of spices in cooking. The need for shallots increasing every day accompanied by a large number of agricultural products, causing the stability of shallot availability in Merauke County to become unstable, To support the needs of consumers shallots imported from outside Merauke. Therefore the condition of the shallots in the storage area is cold and humid. While waiting to be sold in the storage area, it must be maintained temperature and humidity to reduce decay and shrinkage. This prototype monitoring device works to measure and maintain the temperature and humidity in the storage. The data collection method in this study is Literature Study, Observation, Interview, and Documentation. Microcontroller devices are designed or made to be able to control the state of temperature and humidity in the room where the onion is stored. The device also gives notifications via text message to users to be able to find out the state of the onion storage. The results of the study conducted using the DHT11 sensor obtained a temperature measurement accuracy rate of 93.848% and a humidity accuracy rate was 91.808%. This device can detect the temperature and humidity values in the shallot storage room.

Effect of key parameters on the transient thermal performance of a building envelope with Trombe wall containing phase change material

The thermal behavior of a building envelope having a Trombe wall incorporating phase change material (PCM) is investigated during heating season, using experimentally validated 3D computational fluid dynamics (CFD) simulations. The effects of transient versus steady-state ambient irradiation and temperature, presence of PCM and different solar irradiation intensities on the spatial and temporal variation of temperature and airflow rate in the conditioned room are investigated. The results show that the flow transition and temperature rise mainly happen in the near-wall regions close to the room ceiling and in the air channel. They also indicate that the Trombe wall with PCM tends to prevent large fluctuations in room temperature and airflow rate. More importantly, it is determined that under constant radiation flux and ambient temperature, the PCM significantly improves the thermal performance of the envelope and effectively shifts the heating load, but under diurnally transient solar radiation flux and ambient temperature, these benefits seem less evident. Accordingly, caution must be exercised in extrapolating results obtained under constant ambient conditions to situations involving transient ambient conditions.

Analysis of Solar Chimney Application for Building Heating and Cooling in Different Climates in China

Solar chimneys have been applied widely to various buildings under different climate conditions because of their superiority in improving the indoor environment and saving energy. A series of comparative studies of the performance of solar chimneys used in 12 cities in China under different climatic conditions was carried out. A typical solar chimney in a representative building was studied using numerical simulation and analyzed using orthogonal experiment methods. Results show that the optimal structural configuration and the significance of influencing factors of the solar chimney have strong seasonal consistency. The window-to-wall ratio and wall-to-south wall ratio are the most significant influencing factors. Among the 12 cities, the highest average indoor temperature of the case room could be decreased by 5.7°C in summer and increased by 6.7°C in winter. The cooling and heating loads could be reduced by 30%–100% and 46%–56% respectively. The research results can provide practical guidance for future passive solar technology design.

Building envelope-combined phase change material and thermal insulation for energy-effective buildings during harsh summer: Simulation-based analysis

Combined phase change material (PCM) and thermal insulation is a crucial practical opportunity to improve thermal inertia and resistance for energy-effective and nearly-zero energy buildings. To this aim, the current paper quantitatively investigated the role of traditional expanded polystyrene (EPS) thermal insulation of different thicknesses to improve the thermal performance of building envelope integrated PCM under harsh summer months. The improvement in indoor temperature was studied considering the maximum indoor temperature reduction (MITR), time lag (TL), average temperature fluctuation reduction (ATFR) and average operative temperature reduction (AOTR). Thereafter, the average heat gain reduction (AHGR) was introduced to quantify the thermal enhancement of envelope elements. Simulation results revealed that building envelope integrated with PCM-EPS demonstrated better thermal performance than incorporating PCM alone. Compared with the PCM room, the indoor temperature of PCM-EPS rooms was improved by a maximum of 143 %, 177.2 %, 35 % and 8.5 % in terms of MITR, TL, ATFR and AOTR, respectively, along with enhanced envelope resistance by up to 103.8 % concerning the AHGR. Increasing EPS layer thickness by up to 2 cm has increased the PCM room thermal performance during the daytime. However, the EPS thickness of 1 cm showed better performance considering the ATFR and AOTR during full thermal cycles.

Projected parameters of air in the classroom and their impact on the human body

AbstractThe air temperature in school buildings significantly affects the ability of students and teachers to focus on the educational process. Students usually begin to feel an increase the temperature in room. The purpose of this study is to find the limit of the temperature rise in the classroom when people no longer feel the temperature rise in the room. For this reason, several experimental measurements of indoor air parameters were carried out: air temperature, relative humidity and carbon dioxide concentration. Measured temperature differences and individual subjective ratings of audiences determined the dependence using mathematical statistics, from which can be determined the critical level of increase in air temperature at which people no longer perceive the change in air temperature.

Dual-zone economic model predictive control of residential space heating for demand response using a single heat meter

Recent research has indicated a significant potential for providing demand response using Economic Model Predictive Control (E-MPC) of radiators in residential space heating systems. Previous studies indicate the need for distinct temperatures in different rooms, which would require an E-MPC with different temperature constraints across the dwelling. Studies on E-MPC concepts for this purpose often assume that it is possible to measure the heating power delivered to each room separately. However, this assumption is not valid in typical existing residential buildings heated by hydronic radiators; they only have one heat meter measuring the heating use of the entire housing unit. This study presents a simulation-based study of a novel dual-zone E-MPC scheme that relies on indoor air temperature measurements in individual rooms of the housing unit, and only one heat meter measuring the total heating use for space heating and domestic hot water. The results indicate that the proposed scheme has the same load shifting potential as an E-MPC using room-level heat metering. The proposed scheme thus reduces the additional hardware and data infrastructure needed for the practical realization of E-MPC of residential space heating systems for demand response purposes.

Fabrication of copper sulfide nanoparticles from boswellia ovalifoliolata leaf extract and their potential application of environmental pollutants removal, antibacterial activity and antioxidant activity

A nanomaterial has played a major role in protecting the environment-related issues. The prime reason for that nanomaterials synthetics approach is greener pathway, without using any hazardous chemicals and solvents. A huge number of plant-mediated metal sulfide nanoparticle (especially, Copper sulfide) synthesis has been reported and is still successfully continuing, because of its cost effective manner, eco-friendly nature, simple approach, reaction was carried out room temperatur. The current reports to synthesis of Copper sulfide nanostuctured materials through the green patch way, using Boswellia Ovalifoliolata leaves extract. From the UV-Visible spectroscopy noticed nanoparticles absorbance value is around 325 nm. As identified by FT-IR spectroscopy, a variety sources of phytochemicals in the extract which are responsible for the reduction of metal ions and stabilizing of the nanoparticles. X-ray diffraction studies revealed that nanomaterials were crystalline in nature, average crystalline size around 11 nm. SEM revealed that nanoparticles are spherical in nature and average size is 38.43 nm. The current report emphasizes that the materials are an excellent catalyst activity for the reduction of environmental pollutant azo dyes, antibacterial and antioxidant activity. The current article highlights the reduction of the azo dyes, antibacterial and antioxidant activity so the nanomaterials are apromising for the reduction of polluntat dyes.

Research on Thermal and Humidity Environment of Cultural Relics Exhibition Room

In order to meet the needs of humanistic education, museum buildings have developed vigorously in recent years. The protection and display of cultural relics is an effective way to continue historical information, which has important social and cultural significance. During the design and operation of the building air conditioning system, both the thermal and humidity environment of the cultural relics exhibition room should be responsible for the safety of the displayed cultural relics and the thermal comfort of visitors should be considered. In this paper, the indoor thermal and humidity environment of a cultural relic exhibition room in Beijing was measured, and the indoor air velocity distribution and temperature and humidity distribution were obtained. The results show that the thermal and humidity environment of the cultural relics exhibition room is better, but the indoor temperature of the exhibition room is lower, which still has great energy saving potential. It needs to be improved in the future engineering practice to achieve double optimization of comfort and energy saving effect. In order to achieve accurate control of the indoor thermal and humidity environment of the cultural relics exhibition room, we built a data collection for thermal environment parameters and air quality, which is used for monitoring and data collection of the cultural relics exhibition room.