Temperature Of Room Research Articles

Karakteristik Sensorik Telur Asin dengan Pemberian Tepung Daun Jeruk Purut (Citrus Hystrix)

Eggs are a food ingredient with a relatively high protein content and have complete amino acids, unsaturated fats, vitamins and minerals that the body needs and are easy to digest. Eggs are always available throughout the year, but the fact is that egg shells crack easily, relative humidity and temperature in the storage room can affect the quality of eggs and cause chemical and microbiological changes so preservation efforts are needed to maintain the quality of the eggs. Salted eggs are a way to preserve eggs which has the benefit of improving the taste and the texture of the egg yolk. The addition of kaffir lime leaf flour is one of the diversification methods for processing salted eggs. The aim of this research was to determine the sensory characteristics of salted eggs by administering kaffir lime leaf flour. The experimental research used a Completely Randomized Design (CRD) with 5 treatments, namely S0: 0% kaffir lime leaf flour, S1: 15% kaffir lime leaf flour, S2: 20% kaffir lime leaf flour, S3: 25% kaffir lime leaf flour, and S4: 30% kaffir lime leaf flour with 5 repetitions. he results of the research showed that salted eggs with 25% kaffir lime leaf flour produced salted eggs that were liked by the panelists in terms of sensory characteristics.

Application of the Finite Element Method in Determining the Reduced Heat Transfer Resistance of a Hinged Facade System in Residential Buildings

In this paper, the energy efficiency of a ventilated facade is considered by calculating the reduced heat transfer resistance of a hinged facade system (HFS). We have approved three options for fixing the hinged ventilated facade to three types of walls of residential buildings based on the material of: monolithic reinforced concrete, aerated concrete blocks, and solid brick masonry. The choice of these wall filling materials is due to their wide application, both in new construction and in the reconstruction of existing residential buildings, both in mass development and in private housing construction. The thickness of the insulation is also selected. For the selection of insulation, and in general for the calculation of the enclosing structure, the most important factor is the appearance of a dew point. The dew point depends on the thickness and material of the wall filling, the heat and humidity regime inside the building, and climatic conditions. In this paper, research is carried out in terms of calculating the reduced heat transfer resistance of suspended ventilated facades, taking into account in homogeneities using the finite element method, as well as using the traditional method, taking into account the above factors. A comparison of these calculation methods is made and a conclusion is drawn about the expediency of taking into account point bridges of cold. Through cold bridges, energy losses occur, which leads to a change in the temperature regime in the rooms (temperature decrease) during the cold period of the year, and vice versa, to increased heating of the room during the warm period of the year, which leads to the appearance of a dew point in the wall. On a ventilated facade, the most vulnerable point is the brackets, which belong to the group of point bridges of cold. Based on the calculation results, the best wall filling was determined, which reduces the thickness of the insulation from 30 % to 50 % and reduces the specific weight of the wall structure by 1.25–2.1 times, which significantly affects the load on the building foundation.

Temperature Prediction of Mushrooms Based on a Data—Physics Hybrid Approach

Temperature has a significant impact on the production of edible mushrooms. The industrial production of edible mushrooms is committed to accurately maintaining the temperature inside the mushroom room within a certain range to achieve quality and efficiency improvement. However, current environmental regulation methods have problems such as lagging regulation and a large range of temperature fluctuations. There is an urgent need to accurately predict the temperature of mushroom houses in the future period to take measures in advance. Therefore, this article proposes a temperature prediction model for mushroom houses using a data–physical hybrid method. Firstly, the Boruta-SHAP algorithm was used to screen out the key influencing factors on the temperature of the mushroom room. Subsequently, the indoor temperature was decomposed using the optimized variational modal decomposition. Then, the gated recurrent unit neural network and attention mechanism were used to predict each modal component, and the mushroom house heat balance equation was incorporated into the model’s loss function. Finally, the predicted values of each component were accumulated to obtain the final result. The results demonstrated that integrating a simplified physical model into the predictive model based on data decomposition led to a 12.50% reduction in the RMSE of the model’s predictions compared to a purely data-driven model. The model proposed in this article exhibited good predictive performance in small datasets, reducing the time required for data collection in modeling.

Effect of supplementing a Bacillus subtilis-based probiotic on performance, intestinal integrity, and serum antioxidant capacity and metabolites concentrations of heat-stressed growing pigs.

Exposing pigs to heat stress (HS) seems to modify the intestinal microbiota which may compromise the integrity of the small intestine epithelia. Probiotics, live microorganisms, can help pigs to maintain a healthy intestinal environment. Eighty pigs (21.6 ± 3.4kg body weight) exposed to HS or thermal neutral (TN) conditions were used to evaluate the effect of a Bacillus subtilis-based probiotic on performance, body temperature, and intestinal integrity. Treatments were: TN pigs fed a control diet without (TN-C) or with 1 × 106 CFU probiotic/g of feed (TN-P), and HS pigs fed a control without (HS-C) or with probiotic (HS-P). The control diet was formulated with wheat, soybean meal, and free amino acids (AA). Feed and water were freely available during the 21-d study. At completion, samples from duodenum, jejunum, and ileum were collected to analyze epithelial histology and tight junction protein expression; antioxidant activity, and free AA and metabolites in serum. Relative abundance of Lactobacillus, Bifidobacterium, Escherichia coli, and Bacillus in ileal content was analyzed. Ambient temperature in the TN room ranged from 19 to 25 °C, and in HS room from 30 to 38.5 °C. Intestinal temperature in HS-P pigs was lower than in HS-C pigs. Weight gain and feed intake reduced, but feed:gain and respiration rate increased in HS compared to TN pigs, regardless of diet (P < 0.01). Probiotic increased weight gain and improved feed:gain (P < 0.05) in both TN and HS pigs, but feed intake did not differ. Heat stress decreased villi height in jejunum and villi height:crypt depth in duodenum and jejunum (P < 0.05). Probiotic increased villi height in duodenum and ileum, and villi height:crypt depth in all small intestine segments (P < 0.05). Relative abundance of Lactobacillus and Bifidobacterium tended to reduce, and E. coli tended to increase (P < 0.10) in ileal content of HS-C pigs. Ileal relative abundance of Bacillus was higher (P < 0.01) in HS-P pigs than in HS-C and TN-C pigs. Cystathionine, homocysteine, hydroxylysine, α-amino-adipic acid, citrulline, α-amino-n-butyric acid, P-Ser, and taurine were higher in HS than in TN pigs (P < 0.05). These data confirm the negative effect of HS on performance, body temperature, and intestinal integrity of pigs. These data suggest that supplementing 1 × 106 CFU probiotic/g of feed based on Bacillus subtilis DSM 32540 may help to counteract the negative effects of HS on the performance and intestinal integrity of pigs.

Temperature Differences Between Controlled Primary Hypothyroidism and Healthy Patients: An Exploratory Study.

Hypothyroidism is conventionally treated with replacement therapy through levothyroxine (LT4). Despite the improvement in symptoms, cold intolerance persists in some patients. The present study aims to determine whether there is a difference in temperature perception and skin temperature between patients with primary controlled hypothyroidism (PCH) and a group of healthy controls matched for body mass index and age. Secondarily we aimed to determine difference in quality of life. Skin temperature measurements were performed in both groups, both in the central and peripheral regions of the body. In addition, subjects were asked about their perception of temperature in a temperature-controlled room; anthropometric measurements were taken, their quality of life was assessed using the ThyPRO-39, and a thyroid hormone profile was performed. Eleven patients in the PCH group and 30 patients in the control group were studied. It was found that the group with PCH presented a significantly lower palmar temperature than the control group [mean (SD) of 32.05 (1.79) vs 33.10 (1.30) oC, P = .046]. A mediation model showed a direct effect. Temperature perception was equal between groups. The median (interquartile range) of ThyPRO was 8 (5.2) points in the control group vs 21.8 (13.5) in the group of controlled hypothyroidism, P < .001. These results suggest that, despite LT4 treatment, patients continue to present abnormalities in thermogenesis-related thermogenesis, and this may be due to a lack of hormonal adaptation to environmental changes and physiological demands, leading to lower body temperatures and increased sensitivity to cold.

Energy conservation of HVAC systems in isolation rooms using heat pipe heat exchangers

Isolation rooms are crucial in healthcare facilities to prevent the spread of infectious diseases. Infectious diseases can be transmitted to humans from humans or through animals known as zoonoses. With the increase in the number of COVID-19 cases, isolation rooms have become one of the most critical facilities in hospitals. Maintaining the correct temperature and humidity in these isolation rooms is a challenge, considering the heating, ventilation, and air conditioning (HVAC) systems that continuously consume large amounts of energy. With the application of energy conservation methods, the total energy consumption of HVAC systems can be reduced. Many studies have shown that the heat pipe heat exchanger (HPHE) technology can contribute significantly to energy savings using HVAC systems. In this study, the effectiveness of an HPHE on an HVAC system in an isolation room was examined, and the total energy reduction was quantified. The HPHE consisted of two rows with ten heat pipes in each row, arranged in a staggered configuration with fresh air temperature and mass flow variations. The inlet fresh air temperatures varied at 32, 35, 37, and 40 °C and fresh air velocities at 1.2, 1.6, 2.2, and 2.6 m/s. Using a chiller, the inlet fresh air was cooled to a comfortable temperature zone, approximately 24.4–25.2 °C, in the isolation room. Notably, higher velocities decreased the effectiveness of the HPHE. An increase in the flow rate enhanced the system, thereby improving the heat recovery value. The increase in the inlet fresh air temperature from 32 °C, that yielded an energy saving of 1.23 W, to 40 °C, resulted in a further energy saving of 1.85 W. The application of the HPHE in the HVAC system in isolation rooms represents a significant innovation that contributes to a reduction in total energy consumption.

Numerical simulation of indoor air distribution and wall heat storage under accident conditiohs in a main control room

The main control room serves as a refuge for staff in a nuclear power plant in the event of an accident. To determine whether the control room can meet habitability requirements under accident conditions, this study utilized CFD methods to establish a habitability model of the main control room under such conditions. The changing trends of temperature and velocity near personnel were analyzed. The numerical results indicate that the building envelope significantly contributes to reducing the indoor temperature. The average wall temperature measured at 72 hours was 27?C, with an average temperature increase of 4?C. The highest average ambient temperature in the main control room occurred at 24 hours. At this time, the indoor ambient temperature reached approximately 34.62?C, with a temperature increase of 11.62?C, while the wind speed near the personnel remained below 0.2 m/s, meeting habitability requirements for personnel under extreme conditions.

Sistem Pemantauan dan Pengendali Suhu Ruangan Server Berbasis Internet Of Things Dengan Notifikasi Alarm dan Telegram

Server room is a room that is usually used to store network equipment such as routers, personal computer servers, and other important items. These spaces require special attention and proper maintenance, and must be monitored effectively to protect the equipment located there. The impact of not paying special attention to the server room is that the temperature rise of network activity above normal can cause less than optimal hardware performance due to device overheating.In this research, a server room control and monitoring system based on the Internet of Things will be designed with alarms and telegram notifications to measure temperature, humidity, vibration and electrical energy conditions in the server room. The methodology used in this study is the Research and Development system. The system is designed to achieve results, namely monitoring the server room, controlling the temperature of components in the server room, and the system can issue warnings when room conditions are abnormal.The system can send sensor data from slave to master via Modbus RTU connected to RS485. The system can then send data on the 16x2 LCD to the device and issue alarms such as low, high and critical alarms as well as alarms when abnormal room conditions are detected. When the system detects abnormal room conditions, fans cool hot components in the server room.

Pengaruh Bukaan Pada Ruangan Rumah Type 36 Terhadap Kenyamanan Termal Menurut Persepsi Pengguna

Abstract. A house as a shelter for the occupants requires ventilation, both natural and artificial, to achieve thermal comfort. Openings allow air to circulate in and out of the building, thus affecting the humidity and temperature of the building. The research was located in the Type 36 Mutiara Baet Residence housing complex, in Baet Village, Baitussalam District, Aceh Besar Regency. The case study is a house facing west, east, north, and south which has openings without direct sunlight. Using a mixed method research method, which combines qualitative and quantitative models. Qualitative methods are carried out using documentation, interviews, and observation. while the quantitative method is carried out through measurements of humidity, wind speed, and temperature. Interview results showed that 70% of building occupants said that the residence they lived in felt hot so it was uncomfortable to be indoors without mechanical cooling, while the existing openings could not be maximized for natural ventilation as intended. The remaining 30% of respondents thought that openings could help reduce heat. The results of thermal measurements, the average temperature in the living room was 30.93°C, while the average temperature in the kitchen room was 30.99°C. The results of measuring the average humidity (RH%) in the living room was 46.40% and the average humidity (RH%) in the kitchen room was 46.18%. Only 20% of residential living rooms and kitchens in Mutiara Baet Residence have wind circulation, while in the other 80% of residences, the detected wind speed is 0.0 m/s, which means there is no wind movement/circulation

TINJAUAN TATA KELOLA RUANG FILLING BERDASARKAN ILMU ERGONOMI DI PUSKESMAS WANAREJA 1

The lighting for the medical record room at the Wanareja Health Center 1 was uneven throughout the room and the area of ​​the storage room did not meet the standards. This type of research is descriptive qualitative. The object used is the medical record room. The research instruments were room thermometer, meter and lux meter. How to collect data by observation and interviews. For data analysis using descriptive analysis. The results of the study showed that the lighting in the medical record document storage room at the Wanareja Health Center 1 ranged from 137-140 lux but was not evenly distributed throughout the room while the patient registration room ranged from 101-103 lux, the temperature of the medical record room was 23.1oC, the humidity in the medical record room that is 51% so that includes humidity, storage space area of ​​4 m² x 2.5 m² x 3 m². This affects the productivity and performance of the officers themselves. Based on the research results, the proposed solutions and suggestions are expected to improve the lighting of the medical record room and increase the area of ​​the room to make it easier for officers to retrieve or return medical record files so that they comply with established standards and it is advisable to provide lighting, temperature and humidity measuring devices.&#x0D; &#x0D; Keywords: Ergonomics Aspect, Layout, Medical Record Storage.

Simultaneous Enhancement of Welder Health and Aluminum Weld Joint Quality Using Controlled Welding Room Condition

Aluminum alloy is crucial for lightweight and fuel-efficient vehicles due to its strength, lightness, and corrosion resistance. However, welding aluminum vehicle parts poses challenges, particularly porosity issues caused by trapped hydrogen gas in the weld metal. This study aimed to investigate the impact of the welding room environment on the health and properties of aluminum welding joints. To achieve this, an isolated room was created, where variations in airflow velocity (1.1 m/s, 1.6 m/s, and 2.1 m/s) and temperature (19 °C, 27 °C, and 35 °C) were implemented. The fume condition of the room was assessed to determine its impact on health aspects, while bead appearance and macrostructure were evaluated to assess weld joint quality. Results revealed that higher airflow velocity and temperature reduced fume concentration in the welding room, indicating a healthier environment. However, these conditions also led to increased porosity defects and influenced the performance of the shielding gas. Additionally, higher ambient temperatures increased hydrogen solubility in the molten aluminum, exacerbating porosity issues. For optimal welder comfort and high-quality weld joints, it is recommended to maintain a low temperature and airflow velocity in the welding room, ensuring a healthier working environment while minimizing porosity defects.

The Impact of Sensory Stimuli on Healthcare Workers and Outcomes in Trauma Rooms: A Focus Group Study.

This study investigated issues related to noise, lighting, and temperature in trauma rooms that impact patient care and staff performance. Uncontrolled sensory stimuli can hinder healthcare delivery quality in trauma rooms. High noise and temperature levels can increase staff stress and discomfort as well as patient discomfort. Conversely, proper lighting can decrease staff stress levels and reduce burnout. Sensory overload in trauma rooms is a crucial concern, but no studies have been conducted on this issue. Using a convenience sampling method, 65 trauma team members (e.g., surgeons, physicians, nurses) from six Level I trauma centers in the United States were recruited to participate in 20 focus groups. Focus groups were semi-structured and 1 hr long. Staff covered issues related to communications and disruption from noise sources (e.g., equipment, conversations). Having control over lighting allows staff to change light intensity and facilitate their work during the resuscitation. A well-maintained temperature can provide patient comfort or reduce risk of hypothermia, given that patients can lose body heat rapidly due to loss of blood. Excessive sensory stimuli can result in disrupted communication, fatigue, and stress, making staff susceptible to errors. Staffs' control over environmental conditions may lead to a more efficient, comfortable, and safer environment. Technology should be reliable and flexible to facilitate this.

The efficiency of nuisance relief by filtering facepiece respirators used by workers exposed to agricultural odours.

The study aimed to evaluate the effectiveness of filtering facepiece respirators (FFRs) in reducing odour nuisances in agricultural work environment. Additionally, an assessment was conducted on the microbiological contamination of FFRs and the functionality of Time4Mask application in enhancing workplace safety. Two types of FFRs were used for the study: with absorbing properties and reference ones. The research was carried out in 6 livestock rooms during a 1-week period in early spring (February-March 2021) on a farm in central Poland. The microclimate conditions (thermoanemometer), and particulate matter concentrations (laser photometer) were assessed. Additionally, the odour content in the studied rooms and the breathing zone of FFR users (gas chromatography with mass spectrometry) were evaluated. The number of microorganisms on the respirators was determined (cultivation method), followed by their identification (biochemical tests, taxonomic keys). Breakthrough curves were determined for both FFR types to assess absorption capabilities. The average temperature in the livestock rooms was about 13°C, relative humidity - 53%, air flow velocity - 0.21 m/s, and particulate matter concentration - 0.216 mg/m3. A significant variety of odorants was found in the environment and the breathing zone under the FFRs. Bacterial counts ranged between 2.4 × 101 and 2.6 × 102 CFU/cm2, fungi between 3.2 × 100 and 5.4 × 101 CFU/cm2, xerophilic fungi from 4.4 × 100 to 4.0 × 101 CFU/cm2, mannitol-positive staphylococci between 1.6 × 101 and 1.0 × 102 CFU/cm2, and haemolytic staphylococci from 2.2 × 101 to 4.5 × 101 CFU/cm2, depending on the respirator type. Respirators were colonized by bacteria from the genera: Bacillus, Staphylococcus, actinobacteria Streptomyces sp., and fungi: Candida, Absidia, Aspergillus, Mucor, and Penicillium. Respirators with absorbing properties had over 8-times longer breakthrough time than reference ones. Respirators with activated carbon effectively improved work comfort when exposed to odours. Due to growth of microorganisms in the respirator materials, periodic replacement is necessary. It is crucial to provide workers with information about the safe-use time of respirators, considering environmental conditions. This is achievable using modern IT tools like Time4Mask application. Med Pr Work Health Saf. 2023;76(5):363-75.

Heat Transfer In Automatic Duck Egg Incubator Using A Light Bulb As The Heater

The egg incubator is an egg incubator equipped with a heater with a special construction so that the heat in the box is not wasted. This study aims to determine the heat transfer in an automatic egg incubator with incubator dimensions of 0.38 × 0.35 × 0.45 m. The research was conducted by collecting data directly to obtain heat transfer values in automatic egg incubators with a heat source from a light bulb. A digital thermometer was used to measure the temperature of the egg incubator. The incubator temperature was maintained at a maximum temperature of 39°C. Radiation heat transfer that occured in an egg incubator with a surface area of 0.92 m² which was coated with aluminum foil with a material emissivity value of 0.07 and an egg incubator temperature of 39°C (312 K) was 34.6 Watt. The conduction heat transfer that occured on the wall of the egg incubator with the thermal conductivity value of aluminum foil, namely k = 0.034 W/mK, was 34.78 Watt. The results of the study by setting the temperature of the incubator room to a maximum of 39oC obtained a hatching success rate with a hatchability of 75%.

MAKING COOLBOX USING A JUNE SACK WITH RICE HUSK (Oryza sativa) INSULATION AND CORN COB (Zea mays)

Fish quality is very important to determine the selling price of fish in the market; therefore, it is necessary to have special handling in storage so that the quality of fish does not decrease. Fishermen usually use styrofoam-insulated coolboxes to maintain fish quality. This study aims to determine the lowest temperature and temperature stability. This research was conducted in April-June 2022 at the Integrated Fisheries Laboratory, Faculty of Fisheries and Marine Science, Teuku Umar University. The method used is a quantitative experimental method using a completely randomized design (CRD) with 1 control, 2 treatments, and 3 replicates. Tests were carried out by measuring the temperature of the coolbox room filled with 3 kg of bulk ice and looking at temperature changes within 9 hours. The lowest temperature test results contained in the rice husk coolbox were 17.4°C, the corn cob coolbox had the lowest temperature of 19.3°C, and in the styrofoam coolbox (control), the lowest temperature obtained was 13.6°C. The temperature comparison between the styrofoam coolbox, rice husk insulation coolbox, and corn cob insulation coolbox shows that, in terms of the lowest temperature point, the styrofoam coolbox is still better than the rice husk and corn cob coolbox, while the rice husk coolbox is still lower in temperature than the corn cob coolbox

1429. Temperature and Humidity Variations in the Operating Room: A Risk Assessment

Abstract Background The American Society of Heating, Refrigeration, and Air-Conditioning Engineers (ASHRAE) recommends that hospital operating rooms (OR) are controlled for temperature and humidity with established ranges but does allow for exceedances for surgeons and surgical procedures. There is currently no clear consensus or established thresholds for out-of-range temperature and humidity ranges in relation to risk for surgical site infections (SSI). A study was performed at Memorial Sloan Kettering Cancer Center (MSKCC) to further examine if temperature and humidity deviations pose a patient safety risk. Methods The study included 5600 surgical procedures that were performed at MSKCC between September 2021 and January 2022 where temperature and humidity logs were available. Procedures were broken into groups based on in- (n=4419) and out-of-range (n=1187) temperatures and in- (n=5225) and out-of-range (n=381) humidity. SSIs following the procedure were identified using targeted positive microbiology cultures and within NHSN (National Healthcare Safety Network) surveillance periods. Chi-square and Fisher’s exact statistical tests were used to determine if there was a significant difference between groups where p &amp;lt; 0.05. Breakdown of eligible procedures and follow up Table represents the total number of eligible procedures with environmental parameters and SSI follow up period. Results There was no significant impact on SSI for out-of-range humidity (p=0.15). There was a significantly higher SSI rate observed for out-of-range temperatures (p=0.04) more specifically low out- of-range temperatures (p=0.02). A sub-analysis was performed for low temperatures based on procedures by duration. Significance of the finding was lost when surgery duration was 4 hours or greater. Conclusion If there was a true correlation between SSI and low ambient temperature, we would have expected to see a strengthening of SSI risk with longer procedures. This study suggests that temperature and humidity deviations out of the recommended guidelines in the operating room do not pose additional risks for surgical site infections and limited exceedances can be permitted without risking patient safety. Disclosures All Authors: No reported disclosures

Short-Term Prediction for Indoor Temperature Control Using Artificial Neural Network

Recently, data-based artificial intelligence technology has been developing dramatically, and we are considering how to model, predict, and control complex systems. Energy system modeling and control have been developed in conjunction with building technology. This study investigates the use of an artificial neural network (ANN) for predicting indoor air temperature in a test room with windows on an entire side. Multilayer perceptron (MLP) models were constructed and trained using time series data obtained at one-second intervals. Several subsampling time steps of 1 s, 60 s, 300 s, 600 s, 900 s, 1800 s, and 3600 s were performed by considering the actual operation control mode in which the time interval is important. The performance indices of the neural networks were evaluated using various error metrics. Successful results were obtained and analyzed based on them. It was found that as the multi-step time interval increases, performance degrades. For system control designs, a shorter prediction horizon is suggested due to the increase in computational time, for instance, the limited computing capacity in a microcontroller. The MLP structure proved useful for short-term prediction of indoor air temperature, particularly when control horizons are set below 100. Furthermore, highly reliable results were obtained at multi-step time intervals of 300 s or less. For the multivariate model, both calculation time and data dispersion increased, resulting in worsened performance compared to the univariate model.

Impact of outdoor microclimate on the performance of high-rise multi-family dwellings in cold areas and optimization of building passive design

In order to study the impact of outdoor microclimate on the indoor performance, two high-rise multi-family dwellings in two residential estates in Beijing were selected for one-year indoor performance measurement. The air temperature of different rooms and the corresponding cooling and heating energy consumption were measured. The simulation was used to obtain the microclimate data outside the corresponding rooms during the measurement period. Three main microclimatic elements, namely wind speed, solar radiation, and air temperature, were considered in this study. The measured temperature showed that the indoor performance of different rooms in the same high-rise multi-family dwelling has significant differences. Mean air temperature differences can reach a maximum of 8.2 °C in winter and 2 °C in summer. The outdoor microclimate also has a significant impact on indoor performance. For different rooms in the same building, outdoor wind speed and solar radiation are more related to indoor performance in winter than outdoor air temperature. In summer, outdoor air temperature was more related to indoor performance than outdoor wind speed and solar radiation. Finally, this study proposed a passive design optimization method for high-rise multi-family dwellings based on outdoor microclimate adaptation. The method was applied to optimize the north-facing and south-facing window-to-wall ratio of one of the measured buildings, and the optimized solution resulted in savings of 1.6%–6.0 % in cooling energy consumption and 6.1%–7.6 % in heating energy consumption compared to the original design.

Effect of Natural Ventilation on Thermal Performance of Different Residential Building Forms in the Hot-dry Climate of Jordan

This work presents a simulation study on the impact of natural ventilation on the thermal performance and thermal comfort of residential buildings of different forms in the hot-dry climate of Amman, the capital of Jordan. Three existing triple-storey residential buildings with different forms, i.e., rectangular, L-shape, and U-shape, are taken as case studies. Models with similar construction and dimensions of the buildings under investigation are designed using the OpenStudio plugin SketchUp software. Two rooms within these buildings have been considered for simulation with the aid of the EnergyPlus simulator for two cases: the basic case with no ventilation and the case with ventilation. The thermal parameters, including the air temperature, relative humidity, air speed, and mean radiant temperature of both rooms, have been extracted from the simulation. The thermal performance of these buildings is analyzed based on the indoor air temperature and mean radiant temperature, while the thermal performance is investigated via the ASHRAE-55 adaptive model. The results show that the rectangular-shaped building has the best thermal performance in unventilated conditions for the middle room on the middle floor (Room 1). In contrast, the U-shape shows better results for the west-northern room on the same floor (Room 2). On the other hand, introducing natural ventilation to the buildings reduces the indoor temperature and, subsequently, enhances the thermal performance where the buildings transform to be within the comfort zone most of the time, according to the ASHRAE-55 adaptive model. Generally, rectangular and U-shaped buildings show comparable thermal performance, while L-shaped buildings have relatively the worst performance.

Pilot Study on Underground Air Temperature for Interior Thermal Comfort of Building in Malaysia

The purpose of this study is to assess the methods for achieving thermal comfort by utilising underground or subsurface air temperature. The goal of the research is to identify the efficiency of basement design as interior thermal comfort strategy in Malaysia. Two methodologies were employed, including computer modelling simulation and field data collection. The modelling simulation uses Energy Plus software to mimic and test the building’ thermal comfort, while the field data collection method employs a 1m × 1m × 1m physical model in an open space and the temperature was recorded using a globe thermometer. The temperature of underground at various depths was measured to establish the optimal temperature at which the earth may be used as a heat sink. The results from the physical model were then analysed to validate the results of the computer simulation. The result from the physical model and computer simulation shows that the underground temperature manages to decrease the indoor temperature. As a result, the presence of a basement that utilizes the temperature of the earth has significantly reduced the temperature of a specific room.