scholarly journals Correction to “Persistent unstable atmospheric boundary layer enhances sensible and latent heat loss in a tropical great lake: Lake Tanganyika”

2013 ◽  
Vol 118 (11) ◽  
pp. 5347-5347 ◽  
Author(s):  
Piet Verburg ◽  
Jason P. Antenucci
Keyword(s):  
Boundary Layer ◽  
Atmospheric Boundary Layer ◽  
Heat Loss ◽  
Latent Heat ◽  
Great Lake ◽  
Lake Tanganyika ◽  
Latent Heat Loss

scholarly journals Processes Controlling Sea Surface Temperature Variability of Ningaloo Niño

2020 ◽  
Vol 33 (10) ◽  
pp. 4369-4389 ◽  
Author(s):  
Yaru Guo ◽  
Yuanlong Li ◽  
Fan Wang ◽  
Yuntao Wei ◽  
Zengrui Rong
Keyword(s):  
Heat Flux ◽  
Surface Temperature ◽  
Sea Surface Temperature ◽  
Heat Loss ◽  
Latent Heat ◽  
General Circulation ◽  
Sea Surface ◽  
Turbulent Heat ◽  
Sst Warming ◽  
Latent Heat Loss

AbstractA high-resolution (3–8 km) regional oceanic general circulation model is utilized to understand the sea surface temperature (SST) variability of Ningaloo Niño in the southeast Indian Ocean (SEIO). The model reproduces eight Ningaloo Niño events with good fidelity and reveals complicated spatial structures. Mesoscale noises are seen in the warming signature and confirmed by satellite microwave SST data. Model experiments are carried out to quantitatively evaluate the effects of key processes. The results reveal that the surface turbulent heat flux (primarily latent heat flux) is the most important process (contribution > 68%) in driving and damping the SST warming for most events, while the roles of the Indonesian Throughflow (~15%) and local wind forcing are secondary. A suitable air temperature warming is essential to reproducing the reduced surface latent heat loss during the growth of SST warming (~66%), whereas the effect of the increased air humidity is negligibly small (1%). The established SST warming in the mature phase causes increased latent heat loss that initiates the decay of warming. A 20-member ensemble simulation is performed for the 2010/11 super Ningaloo Niño, which confirms the strong influence of ocean internal processes in the redistribution of SST warming signatures. Oceanic eddies can dramatically modulate the magnitudes of local SST warming, particularly in offshore areas where the “signal-to-noise” ratio is low, raising a caution for evaluating the predictability of Ningaloo Niño and its environmental consequences.

Latent heat loss and sweat gland histology of male goats in an equatorial semi-arid environment

2013 ◽  
Vol 58 (2) ◽  
pp. 179-184 ◽  
Author(s):  
Cíntia Carol de Melo Costa ◽  
Alex Sandro Campos Maia ◽  
José Domingues Fontenele Neto ◽  
Steffan Edward Octávio Oliveira ◽  
João Paulo Araújo Fernandes de Queiroz
Keyword(s):  
Heat Loss ◽  
Latent Heat ◽  
Sweat Gland ◽  
Arid Environment ◽  
Latent Heat Loss ◽  
Semi Arid

Modeling and Optimization of a Novel Heat Recovery Design for Thermoelastic Cooling Systems

2015 ◽  
Author(s):  
Suxin Qian ◽  
Jiazhen Ling ◽  
Yunho Hwang ◽  
Ichiro Takeuchi ◽  
Reinhard Radermacher
Keyword(s):  
Heat Loss ◽  
Latent Heat ◽  
Heat Recovery ◽  
Vapor Compression ◽  
Cooling Systems ◽  
Recovery Method ◽  
Optimization Study ◽  
Improvement Potential ◽  
Latent Heat Loss ◽  
Recovery Design

The traditional refrigerants used in the vapor compression cycles have significant environmental impacts due to their high global warming potential. To address this challenge, solid-sate cooling technologies without using any aforementioned fluids have been developed rapidly during the past decades. Thermoelastic cooling, a.k.a. elastocaloric cooling, is a new concept, and thus no systematic studies of it have been conducted to date. Heat recovery plays an important role in the performance of the cooling systems, affected by the parasitic internal latent heat loss inside the cycle. A novel heat recovery (HR) scheme was been proposed in our previous study to minimize such parasitic internal latent heat loss. The objective of this study is to further investigate the performance improvement potential of the proposed heat recovery method by introducing the optimization study using the previously validated heat recovery model. The dynamic model details are revisited. The assumptions behind the model are re-examined by using the real thermoelastic cooling prototype geometries and materials properties of nickel-titanium tubes. A multi-objective optimization problem was formulated for the model and solved by MatLab. The heat recovery efficiency and the heat recovery duration were used as optimization objectives. A well-spread Pareto solutions were obtained, and a final solution was chosen with a 6.7% penalty in HR efficiency but six times faster cycle.

Effect of Moisture Transport on Mixed Convection in Vertical Annulus of a Heated Clothed Vertical Wet Cylinder in Uniform Cross Wind

2010 ◽  
Author(s):  
Nesreen Ghaddar ◽  
Kamel Ghali
Keyword(s):  
Heat Flux ◽  
Relative Humidity ◽  
Mixed Convection ◽  
Heat Loss ◽  
Latent Heat ◽  
Moisture Transport ◽  
Ambient Conditions ◽  
Effect Of Moisture ◽  
Vertical Annulus ◽  
Latent Heat Loss

Ventilation and heat and moisture transport from a vertical clothed wet and heated cylinder subject to uniform cross wind are studied by modeling and experimentation to investigate the effect of wet cylinder conditions and external wind humidity on renewal rate of the air annulus and its temperature. The coupled parabolic momentum, moisture, and heat balance equations including buoyancy are formulated and solved for uniform surface heating and uniformly wetted inner cylinder boundary to predict the air annulus vertical temperature distribution, moisture evaporation rate from the inner surface, total ventilation through the clothing and the top opening, and sensible and latent heat loss for any given environment conditions, clothing permeability and thermal properties, wind speed and annulus geometry. Experiments were performed in a low speed wind tunnel in which a uniformly heated vertical cylinder covered by a wet stretch fabric enclosed by a clothed outer cylinder is placed in uniform cross flow of known temperature and relative humidity. Good agreement was found between the model and the experimental measurements of sensible and latent heat losses, and air annulus temperature profile. A parametric study is performed to study the effect of moisture on sensible and latent heat loss and the induced mixed ventilation for constant heat flux surface condition of the heated clothed cylinder. The effect of adding wet model effect on the axial mass flow rate in vertical annulus does not exceed 3% in comparison with dry cylinder mixed convection at the same total heat flux at ambient conditions of 10°C and 50% relative humidity. For equal heat input to the wet cylinder in comparison to the dry cylinder at ambient conditions of 10°C and 50% relative humidity, the air layer temperature decreased by 1.51°C and 2.62 °C in air layer temperature for permeabilities of 0.05 and 0.25 m/s when compared to air layer temperature for the dry case.

Sensible and latent heat loss from the body surface of Holstein cows in a tropical environment

2005 ◽  
Vol 50 (1) ◽  
pp. 17-22 ◽  
Author(s):  
A. S. C. Maia ◽  
R. G. daSilva ◽  
C. M. Battiston Loureiro
Keyword(s):  
Heat Loss ◽  
Latent Heat ◽  
Body Surface ◽  
The Body ◽  
Tropical Environment ◽  
Holstein Cows ◽  
Latent Heat Loss

CFD based study of thermal sensation of occupants using thermophysiological model. Part I

2014 ◽  
Vol 26 (6) ◽  
pp. 442-455 ◽  
Author(s):  
George Pichurov ◽  
Radostina Angelova ◽  
Iskra Simova ◽  
Iosu Rodrigo ◽  
Peter Stankov
Keyword(s):  
Heat Loss ◽  
Latent Heat ◽  
Air Temperature ◽  
Metabolic Activity ◽  
Human Body ◽  
Cfd Simulation ◽  
Clothing Insulation ◽  
Content Type ◽  
Body Model ◽  
Latent Heat Loss

Purpose – The purpose of this paper is to integrate a thermophysiological human body model into a CFD simulation to predict the dry and latent body heat loss, the clothing, skin and core temperature, skin wettedness and periphery blood flow distribution. The integration of the model allows to generate more realistic boundary conditions for the CFD simulation and allows to predict the room distribution of temperature and humidity originating from the occupants. Design/methodology/approach – A two-dimensional thermophysiological body model is integrated into a CFD simulation to predict the interaction between the human body and room environment. Parameters varied were clothing insulation and metabolic activity and supply air temperature. The body dry and latent heat loss, skin wettedness, skin and core temperatures were predicted together with the room air temperature and humidity. Findings – Clothing and metabolic activity were found to have different level of impact on the dry and latent heat loss. Heat loss was more strongly affected by changes in the metabolic rate than in the clothing insulation. Latent heat loss was found to exhibit much larger variations compared to dry heat loss due to the high latent heat potential of water. Originality/value – Unlike similar studies featuring naked human body, clothing characteristics like sensible resistance and vapor permeability were accommodated into the present study. A method to ensure numerical stability of the integrated simulation was developed and implemented to produce robust and reliable simulation performance.

scholarly journals Stabilization of the Atmospheric Boundary Layer and the Muted Global Hydrological Cycle Response to Global Warming

2009 ◽  
Vol 10 (1) ◽  
pp. 347-352 ◽  
Author(s):  
Jianhua Lu ◽  
Ming Cai
Keyword(s):  
Boundary Layer ◽  
Global Warming ◽  
Atmospheric Boundary Layer ◽  
Latent Heat ◽  
Hydrological Cycle ◽  
Sensible Heat Flux ◽  
Bowen Ratio ◽  
Heat Fluxes ◽  
Global Ocean ◽  
Global Hydrological Cycle

Abstract Both the global precipitation and evaporation in global warming simulations increase at 1%–3% K−1, much smaller than the rate suggested from the Clausius–Clapeyron (C–C) relation (6%–6.5% K−1). However, the reduction of surface sensible heat flux over the global ocean (5.2% K−1) matches the difference between the fractional increase of evaporation and the C–C relation, implying that the fractional decrease of the Bowen ratio over the global ocean follows the C–C relation closely. The analysis suggests that the stabilization of the atmospheric boundary layer (ABL) in response to global warming is the main factor responsible for the simultaneous reduction of the surface sensible flux and the muted increase in the surface latent heat. Because the stabilization of the ABL causes the same amount of fractional change in both the sensible and latent heat fluxes, the fractional decrease of the Bowen ratio closely follows the C–C relation. The ABL stabilization mechanism for the muted increase in the global hydrological cycle in response to global warming is physically consistent with two other proposed mechanisms, namely, the atmospheric energy constraint and the reduction of convective mass flux.

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