Optimal Aerogravity-Assist Trajectories Minimizing Total Heat Load

2017 ◽  
Vol 40 (10) ◽  
pp. 2699-2703 ◽  
Author(s):  
Peter J. Edelman ◽  
James M. Longuski
Keyword(s):  
Heat Load ◽  
Total Heat

Heat and Mass Transfer Analysis of a Pot-in-Pot Refrigerator Using Reynolds Flow Model

2016 ◽  
Vol 8 (3) ◽  
Author(s):  
Ramendra Pandey ◽  
Bala Pesala
Keyword(s):  
Heat Transfer ◽  
Mass Transfer ◽  
Ambient Temperature ◽  
Heat And Mass Transfer ◽  
Heat Load ◽  
Radiation Heat Transfer ◽  
Ambient Air ◽  
Total Heat ◽  
Maximum Efficiency ◽  
Radiation Heat

Heat and mass transfer analysis of evaporative cooling process in a pot-in-pot cooling system is done based on Reynolds flow hypotheses. The model proposed herein assumes that the heat transfer due to natural convection is coupled with an imaginary ambient air mass flow rate (gAo) which is an essential assumption in order to arrive at the solution for the rate of water evaporation. Effect of several parameters on the pot-in-pot system performance has been studied. The equations are iteratively solved and detailed results are presented to evaluate the cooling performance with respect to various parameters: ambient temperature, relative humidity (RH), pot height, pot radius, total heat load, thermal and hydraulic conductivity, and radiation heat transfer. It was found that pot height, pot radius, total heat load, and radiation heat transfer play a critical role in the performance of the system. The model predicts that at an ambient temperature of 50 °C and RH of 40%, the system achieves a maximum efficiency of 73.44% resulting in a temperature difference of nearly 20 °C. Similarly, for a temperature of 30 °C and RH of 80%, the system efficiency was minimum at 14.79%, thereby verifying the usual concept that the pot-in-pot system is best suited for hot and dry ambient conditions.

scholarly journals Fitness-related differences in the rate of whole-body total heat loss in exercising young healthy women are heat-load dependent

2018 ◽  
Vol 103 (3) ◽  
pp. 312-317 ◽  
Author(s):  
Dallon T. Lamarche ◽  
Sean R. Notley ◽  
Martin P. Poirier ◽  
Glen P. Kenny
Keyword(s):  
Heat Loss ◽  
Heat Load ◽  
Total Heat ◽  
Whole Body ◽  
Total Heat Loss ◽  
Healthy Women

scholarly journals ANALYTICAL METHOD TO CALCULATE ROOM COOLING LOAD

2020 ◽  
Vol 7 (8) ◽  
pp. 56-64
Author(s):  
Gedlu Solomon ◽  
Yeshurun Alemayehu Adde
Keyword(s):  
Sea Level ◽  
Latent Heat ◽  
Analytical Method ◽  
Heat Load ◽  
Total Heat ◽  
Cooling Load ◽  
Heat Gain ◽  
Load Calculation ◽  
Building Cooling ◽  
North Latitude

This paper focus on cooling load calculation of the meeting hall [4m*15m*7m] in the location of 8.55 north latitude, East longitude 39.27 and Altitude 1726 m elevation above sea level. The total building cooling load consists of inside design condition of building, outside design condition of building, consider building mater and wall facing to sun and etc.by categorized in to sensible and latent heat gain from ventilation, infiltration and occupants. From different Room heat gain component, the total heat load 21,301.66 w.

Research of Inlet Air Quantity for Mechanical Cooling Tower

2014 ◽  
Vol 1044-1045 ◽  
pp. 388-391
Author(s):  
Bo Yang ◽  
Wen Zhou Yan ◽  
Liang Cai Chen
Keyword(s):  
Control System ◽  
Automatic Control ◽  
Air Temperature ◽  
Heat Load ◽  
Cooling Tower ◽  
Functional Relation ◽  
Ambient Air ◽  
Total Heat ◽  
Ambient Air Temperature ◽  
Temperature And Humidity

The functional relation of inlet air quantity, total heat load, ambient air temperature and humidity of the mechanical cooling tower was analyzed. The curves of inlet air quantity with total heat load, ambient air temperature and humidity were plotted by programing. The results show that the inlet air quantity will increase linearly with total heat load and with ambient humidity as well, but the influence was less. Finally the function of inlet air quantity for mechanical cooling tower is fitted. The function can calculate the inlet air quantity for automatic control system of mechanical cooling tower, to achieve the goal of energy saving.

Synthesis Method of Heat Exchanger Network for Distillation Device

2011 ◽  
Vol 199-200 ◽  
pp. 1509-1512
Author(s):  
Yu Lin Ge ◽  
Ping Wang ◽  
Sheng Qiang Shen ◽  
Jun Liang Xu
Keyword(s):  
Heat Exchanger ◽  
Heat Exchange ◽  
Heat Exchangers ◽  
Heat Load ◽  
Programming Model ◽  
Synthesis Method ◽  
Total Heat ◽  
Heat Exchanger Network ◽  
Exchange Area ◽  
Heat Exchange Network

Mathematical programming model for synthesis of heat exchanger network for distillation unit is established. MINLP problem for heat exchanger network is solved by branch-bound method. Two kinds of heat exchanger network with splitting stream and without splitting stream are obtained. 142 heat exchangers, 8 coolers and 4 heaters are needed in the heat exchanger network without splitting stream. 34 heat exchangers, 8 coolers, 4 heaters, 11 splitters and 11 mixers are needed in the heat exchanger network with splitting stream. The matching situation including heat load, heat exchange area, duty of utilities, flow fraction of splitting, temperature of inlet and outlet, etc. for cold and hot streams in the heat exchanger network with splitting stream is presented in detail, Analysis the relationship between total heat exchange area, total heat load, total capital cost and annual operation cost of the heat exchanger network. Taking the number of heat exchangers and operational flexibility of heat exchange network into consideration, the heat exchanger network with splitting stream is suggested to be selected.

Study on Effect of the External Wall and Windows Heat Load Ratio to the Total Heat Load on the Indoor Heat Comfortability

2013 ◽  
Vol 353-356 ◽  
pp. 3005-3008
Author(s):  
Gang Wang
Keyword(s):  
Numerical Calculation ◽  
Heat Load ◽  
Load Ratio ◽  
Total Heat ◽  
External Wall

To study the relation between the heat load ratio of the external wall and window to the total heat load and the indoor heat comfortability index PMV, putting up the numerical calculation to a radiator heating room. It gains the value of the PMV when the heat load ratio of the external wall and window to the total heat load is separately 0.2 and 0.8, 0.3 and 0.7, 0.4 and 0.6, 0.5 and 0.5, 0.6 and 0.4. And it draws the curve about the PMV and the different heat load ratio of the external wall and window to the total heat load. The curve shows that when the heat load ratio of the external wall and window to the total heat load is 0.4 and 0.6, the indoor heat comfortability index PMV is maximal.

Thermal Performance Analysis of Hydronic Ceiling Radiant Panel Heaters Under Different Parameters

2021 ◽  
pp. 1-40
Author(s):  
Tahir Dikmen ◽  
Tamer Calisir ◽  
Senol Baskaya
Keyword(s):  
Reynolds Number ◽  
Heat Load ◽  
Total Heat ◽  
Pipe Diameter ◽  
Heat Output ◽  
Inlet Temperature ◽  
Net Radiation ◽  
Heating Performance ◽  
Radiation Rate ◽  
Radiant Panel

Abstract A numerical analysis of a ceiling type radiant panel heater system was performed to examine the heating performance under different parameters, using the FloEFD code. Three-dimensional models of the room and radiant panel heater were created and the effects of the Reynolds number, water inlet temperature, pipe diameter and pipe runs on the heating performance of the system were examined in detail. The effects of these parameters on the total heat load, the net radiation rate, and the average surface temperature on the sheet and insulation material have been presented. The total heat load and net radiation rate obtained from the system increase with increase in the Reynolds number. Also, a rise in the water inlet temperature increases the heat output of the system. An increase of approximately 500 W was observed in the total heat output as the pipe diameter increased. It was observed, too, that the heat output increased with increase in pipe runs, although above a certain value the heat output became almost constant. The results of this study could offer information to engineers and manufacturers on the design and use of hydronic radiant systems.

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