The effect of changes in ambient temperature on water intake and evaporative water loss

SummaryThe rate of evaporative water loss has been studied in domestic fowls in the ambient temperature range from 0 to 40°C.Results for whole-body evaporation were similar when obtained by the open-flow and direct-weighing methods. At low levels of absolute humidity the rate increased by 0·03 mg/(g.h.°C) from 0 to 22 °C and by 0·17 mg/(g.h.°C) from 23 to 40 °C. Wholebody evaporation decreased with rising ambient water vapour pressure by 0·7 mg/(g.h.kPa).Cutaneous water loss was greater than respiratory water loss below 21 °C; it accounted for 78% of whole-body evaporation at 0 °C, falling to 25% at 40 °C.The rates of respiratory and whole-body evaporation could both be expressed as linear functions of respiratory frequency.

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Thermoregulation, Oxygen-Consumption and Water Turnover in Stubble Quail, Coturnix-Pectoralis, and King Quail, Coturnix-Chinensis

Australian Journal of Zoology ◽

10.1071/zo9860025 ◽

1986 ◽

Vol 34 (1) ◽

pp. 25 ◽

Cited By ~ 19

Author(s):

JR Roberts ◽

RV Baudinette

Keyword(s):

Oxygen Consumption ◽

Body Temperature ◽

Ambient Temperature ◽

Water Loss ◽

Evaporative Water Loss ◽

Arid Areas ◽

Water Turnover ◽

Evaporative Water ◽

Ambient Temperatures ◽

Regulate Body Temperature

Stubble quail occur in more arid areas of Australia than king quail; however, the rates of metabolism and the ability to regulate body temperature in response to varying ambient temperature are similar in both birds, and resemble those of other quail species. At high ambient temperatures, rates of heat loss mediated by evaporative water loss are lower than those previously reported for more xerophilic species. Overall rates of water turnover and evaporative water loss at lower ambient temperatures are at the lower end of the range predicted for birds.

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Transient Analysis of Microorganism Temperature and Evaporative Losses in an Algae Biofilm Photobioreactor

ASME/JSME 2011 8th Thermal Engineering Joint Conference ◽

10.1115/ajtec2011-44347 ◽

2011 ◽

Cited By ~ 1

Author(s):

Thomas E. Murphy ◽

Halil Berberoglu

Keyword(s):

Ambient Temperature ◽

Water Loss ◽

High Surface ◽

Volume Ratio ◽

Ambient Air ◽

Evaporative Water Loss ◽

Environmental Data ◽

Biofuel Production ◽

Solar Irradiation ◽

Evaporative Water

This study describes the thermal modeling of a novel algal biofilm photobioreactor aimed at cultivating algae for biofuel production. The thermal model is developed to assess the photo-bioreactor’s thermal profile and evaporative water loss rate for a range of environmental parameters, including relative humidity, ambient air temperature, solar irradiation, and wind speed. First, a 24 hour simulation of the system has been performed using environmental data for Memphis, TN, USA on a typical spring day to assess the diurnal variations in system performance. Then, a sensitivity analysis is performed to assess the effect of each environmental parameter on the temperature and evaporative losses of the photobioreactor. It is observed that because of the high surface area-to-volume ratio of the system, the temperature of the system exceeds that of the maximum ambient temperature during daylight hours by approximately 0.5 °C and is lower than the minimum ambient temperature at night by approximately 1.4 °C because of evaporative and radiative cooling. Furthermore, without active cooling, the characteristic evaporative water loss from the system is approximately 4.8 L/m2-day.

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