Decrease In Ambient Temperature Research Articles

Short term changes in ambient temperature and acute risk of atrial fibrillation episodes

IntroductionAtrial fibrillation is one of the most common arrhythmias, currently prevalent in approximately 1-3 % of the population but predicted to increase substantially due to an aging population. It is associated with a higher risk of stroke, dementia, and mortality, as well as reduced quality of life. A seasonal pattern of hospital admissions for atrial fibrillation has been observed, with increased cases during the colder months. Previous studies suggest associations between short-term decreases in ambient temperature and acute onset of atrial fibrillation episodes, but the evidence is limited.MethodWe screened 8,899 randomly selected 75-yearolds living in Stockholm for atrial fibrillation using home-based short-term ambulatory 1-lead ECG-measurements 2-4 times a day for 14 days. Screenings were carried out in 2012-2013 and 2016-2018. We used generalized estimating equations to quantify the association between ambient temperature obtained from a fixed monitoring station and risk of atrial fibrillation, adjusting for day of week, time of day and relative humidity. We explored different exposure windows and susceptible subgroups.ResultsAmong 218 participants with 469 atrial fibrillation episodes during the screening period we did not observe a statistically significant association between 24-hour prior ambient temperature and atrial fibrillation [-1% (95% CI -2%; 1%) per 1°C). We explored different exposure windows ranging from 6 to 48 hours as well as lagged exposures 12-24 hours and 24-48 hours with similar suggestive but non-significant inverse associations. A more pronounced and statistically significant association was observed for participants with diabetes [-5% (95% CI -9%; -1%) per 1°C). We did not observe any difference in the association by sex or hypertension.ConclusionOverall, short-term temperature was not strongly associated with triggering of atrial fibrillation episodes. However, there was some evidence to suggest an association between a drop in temperature and increased risk of atrial fibrillation among participants with diabetes.

Experimental investigation on the heating performance of a CO2 heat pump system with intermediate cooling for electric vehicles

This study proposed an improved CO2 heat pump system for electric vehicles by introducing the concept of two stage compression with intermediate cooling. A coefficient of performance optimal control strategy was proposed based on the discovered feature that the changing trend of the COP is consistent with that of the inlet temperature of the electronic expansion valve. Contrast experiments between the heat pump with intermediate cooling compressor and the basic heat pump were conducted. Result shows that the two stage compression with intermediate cooling contributes to 50–132% increment in the heating capacity and 18.9–61.9% improvement in the COP over the basic system as the ambient temperature decreases from 0 °C to −20 °C. The advantages increase with the decrease in ambient temperature. The typical COP of this system under −20 °C ambient temperature and 20 °C in-car temperatures condition is approximately 1.70 while the discharge temperature is controlled well within 100 °C.

A study on optoelectronic performance of perovskite solar cell under different stress testing conditions

Since the inception of perovskites in the light absorbing region of solar cell, perovskite solar cell (PSC) have come a long way from a mere power conversion efficiency (PCE) of 3.8% in 2009 to 25.2% in 2019. The sudden growth in efficiency is riddled with instability issues caused by myriad extrinsic and intrinsic factors like moisture, heat, cell configuration etc., which would prove difficult for commercial scalability of the cells. Like other commercially established photovoltaic cells, PSCs have to pass certain stress tests before it can be deemed commercially viable. In the present study, we have focussed on three main types of stress testing on perovskite solar cells, 1) Damp heat test (i.e. solar cells were exposed to high humidity (RH>85%) and high temperature (85 °C) simultaneously, 2) Thermal stress (sudden increase and decrease in ambient temperature with a ramp rate of 65 °C/h) and 3) Outdoor aging under natural diurnal conditions for 504 h. Our results show that the PSCs are more susceptible to accelerated degradation under damp heat test due to the combined effect of heat and moisture retaining less than 1% of initial PCE. Under lower humidity levels, they managed to retain ~70% of initial PCE. Moreover, cells had ~37% of initial PCE towards 504 h of outdoor exposure. Temperature dependence on resistances of the cell was also studied under thermal stress conditions. Our results and analysis would be helpful for those interested in developing or designing a consensus on testing PSCs before paving its way for commercialization.

خنک سازی محیطهای شهری و تأثیر آن بر تغییرات اقلیمی در محلات سنتی و سکونتگاههای غیررسمی از طریق آسایش حرارتی بیرونی (نمونه موردی محلات عاملی ، قلعه ساختمان و شهرک حجت شهر مشهد)

خنک سازی محیطهای شهری و تأثیر آن بر تغییرات اقلیمی در محلات سنتی و سکونتگاههای غیررسمی از طریق آسایش حرارتی بیرونی (نمونه موردی محلات عاملی ، قلعه ساختمان و شهرک حجت شهر مشهد)

Experimental Study of Self-heating Ignition of Lithium-Ion Batteries During Storage: Effect of the Number of Cells

Lithium-ion batteries (LIBs) are widely used as energy storage devices. However, a disadvantage of these batteries is their tendency to ignite and burn, thereby creating a fire hazard. Ignition of LIBs can be triggered by abuse conditions (mechanical, electrical or thermal abuse) or internal short circuit. In addition, ignition could also be triggered by self-heating when LIBs are stacked during storage or transport. However, the open circuit self-heating ignition has received little attention and seems to be misunderstood in the literature. This paper quantifies the self-heating behaviour of LIB by means of isothermal oven experiments. Stacks of 1, 2, 3 and 4 Sanyo prismatic LiCoO2 cells at 30% state of charge were studied. The surface and central temperatures, voltage, and time to ignition were measured. Results show that self-heating ignition of open circuit LIBs is possible and its behaviour has three stages: heating up, self-heating and thermal runaway. We find for the first time that, for this battery type, as the number of cells increases from 1 to 4, the critical ambient temperature decreases from 165.5°C to 153°C. A Frank-Kamenetskii analysis using the measured data confirms that ignition is caused by self-heating. Parameters extracted from Frank-Kamenetskii theory are then used to upscale the laboratory results, which shows large enough LIB ensembles could self-ignite at even ambient temperatures. This is the first experimental study of the effect of the number of cells on self-heating ignition of LIBs, contributing to the understanding of this new fire hazard.

Thermodynamic and exergy analysis of a S-CO2 Brayton cycle with various of cooling modes

The thermal performance of S-CO2 Brayton cycle is deeply affected by the cooling mode as well as the meteorological and hydrologic conditions. We proposed the three different cooling modes, wet cooling system (WCS), dry cooling system (DCS) and hybrid cooling system (HCS), to the S-CO2 Brayton cycle, and its thermodynamic model was established adopting Ebsilon code. From the viewpoints of both energy and exergy, the efficiencies of cycles with WCS, DCS and HCS as well as the exergy loss distribution of component were analyzed, under full and partial load conditions. Then the influences of changeable meteorological parameters on the cycle performance and the corresponding thermodynamic parameters were studied. Results show the generation efficiency of cycle with DCS is highest, followed by that of cycle with HCS and WCS, and the corresponding supply efficiency of cycle with the three cooling modes are in reverse order. The thermal performance of S-CO2 Brayton cycle gradually deteriorates, as the ambient temperature increases (WCS, HCS, and DCS) or relative humidity decreases (WCS and HCS). HCS shows excellent water saving capacity (variation range of water saving ratio is 59.08%~95.56%), and its water saving effect is more obvious, as ambient temperature decreases and relative humidity increases. Meanwhile, HCS brings equivalent cycle thermal efficiency to WCS, which is recommended for the S-CO2 Brayton cycle in the water arid regions. The present research may lay a foundation for the water cooling system design and the whole cycle operation optimization.

Experimental Study of the Performance of a Li-Ion Battery in a Highway Driving Cycle

Li-ion batteries, as a secondary battery type, are currently the most viable option for powering hybrid/electric vehicles. They have considerable advantages such as high specific energy and power, no memory effect, long cycling life, low maintenance requirement, and low self-discharge rate. However, their thermal performance can easily deteriorate at extreme ambient temperatures. Therefore, in this study, thermal and electrical behaviors of Li-ion batteries were investigated under various operating temperatures using a driving cycle that represents a highway driving condition. A battery testing system was used to determine the performance of Li-ion batteries under simulated loads. The results show that the measured temperature profiles, in broad strokes, follow the current profile. Because of the thermal capacitance of the battery, the changes in temperature variations are observed to be the smoothened out version of the current profile. Moreover, the results show that the extreme ambient temperatures have adverse effects on thermal performance of Li-ion batteries. The volumetric energy density and the capacity of the cell significantly decrease at cold ambient temperatures, especially for the sub-zero temperature applications possibly due to weak ionic conductivity within the cell. On the other hand, the difference between the ambient temperature and the surface of the cell becomes more pronounced as the ambient temperature decreases.

Using a scale model room to assess the contribution of building material of volcanic origin to indoor radon

Abstract In the frame of Radon rEal time monitoring System and Proactive Indoor Remediation (RESPIRE), a LIFE 2016 project funded by the European Commission, the contribution of building materials of volcanic origin to indoor radon concentration was investigated. First, total gamma radiation and related outdoor dose rates of geological materials in the Caprarola area (Central Italy) were measured to define main sources of radiation. Second, 222Rn and 220Rn exhalation rates of these rocks used as building materials were measured using an accumulation chamber connected in a closed loop with a RAD7 radon monitor. Among others, the very porous “Tufo di Gallese” ignimbrite provided the highest values. This material was then used to construct a scale model room of 62 cm × 50 cm × 35 cm (inner length × width × height, respectively) to assess experimental radon and thoron activity concentration at equilibrium and study the effects of climatic conditions and different coatings on radon levels. A first test was carried out at ambient temperature to determine experimental 222Rn and 220Rn equilibrium activities in the model room, not covered with plaster or other coating materials. Experimental 222Rn equilibrium was recorded in just two days demonstrating that the room “breaths”, exchanging air with the outdoor environment. This determines a dilution of indoor radon concentration. Other experiments showed that inner covers (such as plasterboard and different kinds of paints) partially influence 222Rn but entirely cut the short-lived 220Rn. Finally, decreases in ambient temperature reduce radon exhalation from building material and, in turn, indoor activity concentration.

Quality Evaluation of Oranges Stored in Evaporative Coolers

Large quantities of oranges are wasted during storage due to its highly perishable nature. Research was therefore conducted on quality evaluation of orange fruits stored in aluminum-cladded (ABBEC) and non-cladded burnt-clay-brick evaporative coolers (NBBEC) to prevent postharvest loss. Essentially, the evaporative coolers comprised of double burnt-brick walls (1.29 × 2.55 × 2.56 m) external and (1.13 × 1.27 × 2.08 m) internal, (L × W × H) with wet sand bed in between and a storage space of (1.13 × 0.36 × 1.32 m), (L × W × H). Metabolic rates of oranges were highest at ambient storage, intermediate in NBBEC with the least value in ABBEC. Beta carotene, ascorbic acid and acidity decreased while total soluble solids, pH and microbial loads increased during storage. ABBEC storage resulted in 4.0 to 5.3°C decrease in ambient temperature with corresponding higher relative humidity over the non-cladded burnt-clay-brick coolers.

Study on thermomechanical coupling characteristics of embedded sensor lithium batteries under low‐temperature environment

AbstractAircraft usually undergoes a low temperature during flight. It is crucial to understand the strain generation mechanism within lithium‐ion batteries in low temperature to prevent electrode rupture caused by uneven strain of the cell. As such, LFP pouch cell was chosen as experimental objects and the sensors were embedded inside the battery to get the internal parameters directly. Battery cycle experiments were conducted in a 2 m × 2 m × 2 m cabin in, respectively, 25°C, 10°C, −10°C, −20°C ambient temperatures with high C rates of 3C during the charge‐discharge process, which is to simulate the aircraft flying process in low temperatures at different altitudes. Parameters such as voltage, internal temperature, and strain were measured. The results revealed the significant impact on thermomechanical coupling characteristics of LFP battery caused by low temperature. As the ambient temperature decreases, the maximum strain increases. The strain is positively correlated with the temperature of the battery, and as the ambient temperature decreases, battery temperature would have more effects on strain. Besides, it was also found that in a low‐temperature environment, the heat generated by the battery itself is beneficial to its performance recovery.

Добова поведінка та температура тіла лактуючих корів за низької температури повітря в корівнику каркасного типу

Abstract. The temperature of the frame cowshed type of air intended for unleaded boxing retention of lactating cows, as well as the behavior and skin temperature of animals at low air temperature were investigated. It was found that with a decrease in ambient air temperature during the day from - 8.0 to - 22.6 °C, the air temperature in the first cowshed, calculated on 1000 lactating cows, decreased from 9.7 to - 0.39 °C, and in the second - from 2.49 to - 2.62 °C. In lactating cows, which have been exposed to low air temperature for a long time, the temperature of the skin on the head, neck, thoracic and pelvic limbs, trunk and mammary gland, whose value averaged 24.9-16.0 days in different parts of the animal's body, is reduced ° C in the first barn and 21.1 - 13.8 °C in the second. With the decrease in the air temperature in the cowshed to below-zero values, the skin temperature in the breast section in lactating cows dropped from 30.7 to 17.0 °C, and in the trunk area from 27.7 to 19.7 °C and was higher than the skin head, neck, thoracic and pelvic limbs. In lactating cows, the skin temperature at the head, neck, thoracic and pelvic extremities during the day also decreased and depended on the air temperature in the cowshed. It was found that with decreasing air temperature in the cowshed during the day in the study groups, the number of animals resting while standing or lying in the box increased, but the number of lactating cows consuming feed and water and moving along the section decreased. It is recommended to use the obtained results to improve the unboxing method of keeping lactating cows in frame cowsheds at low ambient air temperatures. Keywords: cowshed, lactating cows, behavior, temperature, skin

Особенности работы холодильного винтового компрессора при понижении температуры окружающей среды

Особенности работы холодильного винтового компрессора при понижении температуры окружающей среды

Clinical blood pressure responses to daily ambient temperature exposure in China: An analysis based on a representative nationwide population

BackgroundLimited evidence is available regarding the potential heterogeneity of ambient temperature on blood pressure (BP) in various climate zones. ObjectivesTo explore the effect of daily ambient temperature on BP in various climate zones across 31 provinces in China. MethodsA representative population sample (n = 451,770) were obtained from the China Hypertension Survey study (CHS) from October 2012 to December 2015. Survey seasons were divided into warm and cold seasons. Survey sites were divided into three climate zones as subtropical, temperate monsoon and temperate continental zones. ResultsAfter adjustment for confounders, an overall 10 °C decrease in ambient temperature was statistically associated 0.74 mmHg (95% CI: 0.69, 0.79) and 0.60 mmHg (95% CI: −0.63, −0.57) rise for SBP and DBP, respectively. In the warm season, U-shaped exposure-response curves were observed between ambient temperature and BP in temperate monsoon and continental zones, and liner curves in other zones. A greater SBP change due to a lower temperature was observed in subtropical zones, so did DBP in temperate continental zones, especially for cold season. Female, rural and elderly populations were more susceptible to cold weather than their counterparts. DiscussionThere is a geographical disparity between temperature and BP across different climate zones, which should been taken into consideration when maintaining stable blood pressure levels.

Energy performance analysis of GE-F5 gas turbines at off-design conditions by applying an innovative convergent–divergent system for the inlet air cooling

Ambient air temperature increase, in a gas power plant, causes the intake air mass flow rate to be decreased and can have a significant reducing effect on output power and efficiency. To compensate for this reduction, at different climate conditions, various systems can be used to cool the inlet air. To predict the performance of a gas turbine at off-design conditions (by changing surrounding conditions and/or the air cooling method), modeling of the unit performance is required. Due to the high consumption of water and electricity in the conventional cooling systems, in this paper, in addition to introducing an off-design algorithm, governing equations of each cycle elements were inferenced by their characteristic curve. By developing code in MATLAB software, the effect of applying a novel convergent–divergent system on GE-F5 gas units in Yazd Zanbagh power plants was studied. The results show that in a temperature range between 14 and 50 °C, for each degree decrease in ambient air temperature, an approximately 8.99 kW increase in output power can be obtained. The main advantage of this system is the capability of its application in both dry and humid regions. In addition, the refrigerant medium is not required, which makes this system desirable to use in arid areas.

Universal Molecular Triggers of Stress Responses in Cyanobacterium Synechocystis.

Systemic analysis of stress-induced transcription in the cyanobacterium Synechocystis sp. strain PCC 6803 identifies a number of genes as being induced in response to most abiotic stressors (heat, osmotic, saline, acid stress, strong light, and ultraviolet radiation). Genes for heat-shock proteins (HSPs) are activated by all these stresses and form a group that universally responds to all environmental changes. The functions of universal triggers of stress responses in cyanobacteria can be performed by reactive oxygen species (ROS), in particular H2O2, as well as changes in the redox potential of the components of the photosynthetic electron transport chain. The double mutant of Synechocystis sp. PCC 6803 (katG/tpx, or sll1987/sll0755), which is defective in antioxidant enzymes catalase (KatG) and thioredoxin peroxidase (Tpx), cannot grow in the presence of exogenous hydrogen peroxide (H2O2); and it is extremely sensitive to low concentrations of H2O2, especially under conditions of cold stress. Experiments on this mutant demonstrate that H2O2 is involved in regulation of gene expression that responds to a decrease in ambient temperature, and affects both the perception and the signal transduction of cold stress. In addition, they suggest that formation of ROS largely depends on the physical state of the membranes such as fluidity or viscosity. In cyanobacteria, an increase in membrane turnover leads to a decrease in the formation of ROS and an increase in resistance to cold stress. Therefore: (1) H2O2 is the universal trigger of stress responses in cyanobacterial cells; (2) ROS formation (in particular, H2O2) depends on the physical properties of both cytoplasmic and thylakoid membranes; (3) The destructive effect of H2O2 is reduced by increasing of fluidity of biological membranes.

ATTENUATION OF LOW AMBIENT TEMPERATURE-INDUCED ELEVATION OF BLOOD PRESSURE BY SPECIAL HYPERTENSIVE MEDICINES

Objective: It is well documented that elevated blood pressure is associated with low ambient temperature, which is related with increase of sympathetic nervous system and renin-angiotensin system activities. In the current study, we aim to determine whether hypertension medicine, such as angiotensin converting enzyme inhibitor(ACEI), beta-blocking agent is effective in the prevention of cold-induced elevation of blood pressure and to shed light on underlying mechanism.Design and method: A stratified multistage random sampling method was used in The China Hypertension Survey study from 2012 to 2016, aimed to obtain nationally representative sample of the general Chinese population aged greater than 15 years in 31 provinces of mainland China, finally, a total of 466,670 was eligible and enrolled into our analysis. generalized linear model was applied to explore the estimates of ambient temperature on blood pressure after adjustment for potential confounders. Results: Among 46513 individuals taking hypertensive drugs, those taking beta-blocking agent, and medicine decreasing renin-angiotensin system activities were observed to mitigate the adverse effects of cold weather on blood pressure. Individuals taking beta-blocking agent was showed to have lower effect of cold weather on blood pressure, with 3.4 mmHg increase in SBP with per 10°C decrease in ambient temperature, while, those not taking beta-blocking agent had a average 5.7mmHg increment in SBP with per 10°C decrease in ambient temperature. Furthermore, individuals taking ACEI or angiotensin receptor blocker(ARBs) could completely counteract the adverse effect of cold weather on blood pressure. Hypertensive patients taking ACEI and ARB were found to had a average 1.4 and 1.5 mmHg increase in SBP and DBP, respectively, which did not have statistical significance. Conclusions: Hypertensive medicines such as ACEI, ARB and beta-blocking agent attenuated adverse effect of blood sympathetic nervous system and renin-angiotensin system activities. With the widely awareness of extreme weather on human health, it may provide a novel strategy for low temperature-induced blood pressure, aimed to decrease the prevalence of hypertension in cold weather.

Testing the metabolic homeostasis hypothesis in amphibians.

A number of hypotheses about compensatory mechanisms that allow ectothermic animals to cope with the latitudinal decrease in ambient temperature ( TA) have been proposed during the last century. One of these hypotheses, the 'metabolic homeostasis' hypothesis (MHH), states that species should show the highest thermal sensitivity of the metabolic rate ( Q10-SMR) at the colder end of the range of TAs they usually experience in nature. This way, species should be able to minimize maintenance costs during the colder hours of the day, but quickly take advantage of increases in TA during the warmer parts of the day. Here, we created a dataset that includes Q10-SMR values for 58 amphibian species, assessed at four thermal ranges, to evaluate three predictions derived from the MHH. In line with this hypothesis, we found that: (i) Q10-SMR values tended to be positively correlated with latitude when measured at lower TAs, but negative correlated with latitude when measured at higher TAs, (ii) Q10-SMR measured at lower TAs were higher in temperate species, whereas Q10-SMR measured at higher TAs were higher in tropical species, and (iii) the experimental TA at which Q10-SMR was maximal for each species decreased with latitude. This is the first study to our knowledge showing that the relationship between Q10-SMR and latitude in ectotherms changes with the TA at which Q10-SMR is assessed, as predicted from an adaptive hypothesis. This article is part of the theme issue 'Physiological diversity, biodiversity patterns and global climate change: testing key hypotheses involving temperature and oxygen'.

Off-design performance of CAES systems with low-temperature thermal storage under optimized operation strategy

Compressed air energy storage (CAES) systems usually operate under off-design conditions due to load fluctuations, environmental factors, and performance characteristics of the system. However, the current research on off-design performance of CAES systems, especially in the aspects of advanced compressed air energy storage systems and operation strategies, is deeply insufficient. The complete off-design model of a compressed air energy storage system with thermal storage (TS-CAES) and optimal regulations by adjusting variable inlet guide vane (VIGV) and variable stator vane (VSV) is established for the first time. Using this model, we uncover the off-design characteristics common in TS-CAES systems caused by changes in load, ambient temperature, and operation type (constant pressure operation and sliding-pressure operation), and which is conducted under the optimal regulation strategy for the compression and expansion sections. It is found that system parameters fluctuate around a balance position with load fluctuation. But under the optimal operation, the fluctuation of the system efficiency and energy density is relatively small. System efficiency and energy density increase marginally with the decrease of ambient temperature, and thermal storage temperature increases linearly and markedly with rise in ambient temperature. We also found that system efficiency under constant pressure operation is decreased by 1.74 percent compared to that under sliding-pressure. This study will provide theoretical support for the design, operation, and control of TS-CAES systems.

Environmental assessment of a binary geothermal sourced power plant accompanied by exergy analysis

In this study, a geothermal power plant endowed with actual operational conditions and its equipment are evaluated using exergoenvironmental analysis from the perspective of environmental impact. Environmental impacts related to equipment (including construction, operation/maintenance and disposal), exergy destruction and pollution formation are taken into consideration. Moreover, effects of ambient temperature and brine input temperature with respect to environmental impact factors of the system are also discussed. Though this analysis, relative difference of specific environmental impacts, exergoenvironmental factor and total environmental impact are determined as 122% and 2.5% and 2285 Pts/h, respectively. The results of the study show that 98% of total environmental impact for the geothermal power plant is the cause of exergy destruction of the equipment involved. For this reason, improvement of exergetic efficiency for equipment should be considered rather than construction, operation/maintenance and disposal changes of system equipment. Hence, it is probably possible to have a higher capacity plant by getting a better condenser performance, as well as strengthening the vaporizers and the pumps. Besides, approximately 44 Pts/h of non-condensable gas-NCG (CO2 mostly) released from vaporizer to atmosphere caused environmental impact of the system to be measured as high environmental impact value of electricity equal to 0.108 Pts/kWh. In conclusion, conditions during which the ambient temperature decreases and brine input temperature increases, the system’s environmental impacts concurrently decrease. This study is expected to serve as a guidework for researchers involved in environmental impacts of geothermal power plants and improvement of the plants in terms of environmental impact.

Examining the effects of housing temperature on mitochondrial adaptations to exercise and the browning of white adipose tissue

The thermoneutral zone for small rodents is ~29–31°C and with decreases in ambient temperature below this there are consequent increases in metabolism to promote thermogenesis. Despite this, many studies report housing mice at room temperature for the convenience of the researchers studying them. As such, the conflicting reports between human and rodent models of exercise‐induced mitochondrial biogenesis in adipose tissue and the browning of white adipose tissue may be explained by the often‐overlooked variable, housing temperature. Male 8‐week‐old C57BL/6 mice were housed in cages with (VWR) or without (SED) running wheels (n = 12/group/condition) for 5–6 weeks at room temperature (RT; 22°C) or at thermoneutrality (TN; ~29°C). Mice housed at TN ran a greater distance. VWR protected against weight gain independent of housing temperature however food intake was greater in both VWR and SED mice housed at RT compared to TN. Inguinal white adipose tissue (iWAT) and epididymal white adipose tissue (eWAT) mass were reduced following VWR independent of housing temperature and there were main effects of both exercise and temperature to reduce brown adipose tissue (BAT) mass. There was no effect of housing temperature on circulating glucose or glycerol concentrations however NEFA, insulin, and the HOMA‐IR were increased at TN. In eWAT there was a main effect of exercise to increase cytochrome c oxidoreductase core I subunit (CORE1), cytochrome c oxidase, and peroxisome proliferator‐activated receptor‐γ coactivator‐1α (PGC‐1α) protein content with a main effect of housing temperature for PGC‐1α as well. There was a strong trend for an exercise‐induced increase in pyruvate dehydrogenase (PDH). In iWAT, there was a main effect of exercise and temperature on mitochondrial proteins with VWR leading to the expected increases in PDH, CORE1, COX IV, and PGC‐1α, but reduced markers of mitochondrial content at TN. Most notably protein content of the thermogenic uncoupling protein‐1 (UCP‐1) was undetectable in iWAT at TN. Qualitative histological analysis revealed patches of multilocular adipocytes in iWAT with VWR at RT but not at TN. Together our findings provide novel evidence that while housing mice at TN reduces markers of mitochondrial content in adipose tissue under sedentary conditions, the ability of exercise to increase mitochondrial protein content remains largely intact.Support or Funding InformationOntario Graduate Scholarship Canada Research Chairs ProgramThis abstract is from the Experimental Biology 2019 Meeting. There is no full text article associated with this abstract published in The FASEB Journal.