An Analytical Model to Simulate the Automotive Cooling System

2005 ◽  
Author(s):  
Emad Samadiani ◽  
Amirhasan Kakaee
Keyword(s):  
Analytical Model ◽  
Cooling System ◽  
Water Flow Rate ◽  
Wind Tunnel Test ◽  
Cooling Water ◽  
Inlet Temperature ◽  
Automotive Engine ◽  
Cooling Water Temperature ◽  
Cooling Water Flow Rate ◽  
Flat Tubes

In this paper the effect of simultaneous operation of the automotive radiator, fan, engine, and cooler system on radiator coolant inlet temperature is studied. For this purpose, an analytical model is developed to simulate the automotive cooling system. First, the heat transfer rate and air pressure drop in radiators with louvered corrugated fins and flat tubes are modeled and compared with wind tunnel test results over six radiator cores. Also, the air flow path is simulated. Two preexisting codes are used to simulate the automotive engine and cooler system. Then a code is developed in order to investigate the effect of different parameters related to each component of the cooling system on cooling water inlet temperature. In the end, the effect of ambient temperature, cooling water flow rate, and fin pitch on cooling water temperature at different speeds of a sample automobile is examined.

Effective Fuel Consumption by Improving Cooling Water Flow Rate in IC Engine

2015 ◽  
Vol 812 ◽  
pp. 112-117
Author(s):  
K.M. Kumar ◽  
P. Venkateswaran ◽  
P. Suresh
Keyword(s):  
Flow Rate ◽  
Cooling System ◽  
Water Flow Rate ◽  
Research Work ◽  
Cooling Water ◽  
Major Change ◽  
Clear Understanding ◽  
Water Pump ◽  
Ic Engine ◽  
Cooling Water Flow Rate

The coolant (water) pump assumes an important role of cooling system in IC engines. With upgrading of the engine power by turbocharging and turbo inter cooling, the water pump capacity needs to be increased corresponding to the power. This capacity enhancement has to be achieved without calling for a major change in the existing water pump, envelop and related fitment details. This requires a clear understanding of centrifugal pump for its performance parameter. One such engine is upgraded by turbocharging from 195PS to 240PS @2200 rpm. Improving water pump flow by changing the impeller dimensions, impeller casing, increase the suction, delivery pipe diameter had been done. Validation of the water pump in its actual engine installation was taken up as a part of the research work. Flow rate comparison of the new pump with the existing pump was made and the results were analyzed. The new water pump gives better flow rates for the engine speeds up to1800 rpm, beyond which the flow rate is slightly lesser than the existing pump.

The Numerical Simulation and Design of a Homogeneous Nonisothermal Multi-pass Shell-and-Tube Reactor

1973 ◽  
Vol 95 (2) ◽  
pp. 206-210
Author(s):  
T. G. Smith ◽  
J. T. Banchero
Keyword(s):  
Shooting Method ◽  
Water Flow Rate ◽  
Cooling Water ◽  
Minimum Size ◽  
Exothermic Reactions ◽  
Cooling Water Temperature ◽  
Tube Reactor ◽  
Cooling Water Flow Rate ◽  
Maximum Reaction ◽  
Shell And Tube

The simulation of a multi-pass shell-and-tube reactor requires the solution of a nonlinear two-point boundary-value problem. Six nonlinear ordinary differential equations describing the production of ethanolamines in 1–2 and 1–4 shell-and-tube reactors are solved numerically using both a quasi-linearization algorithm and a classical shooting method. Despite the presence of five unknown initial values, the shooting-method approach proved superior for this particular problem. The simulation revealed that for exothermic reactions the optimum tube-side temperature profile (and therefore the minimum-size reactor) was most closely approached by designing for the lowest overall heat transfer coefficient and cooling-water flow rate and highest inlet cooling-water temperature, subject to the constraint of a maximum-reaction mixture temperature.

Analisis Efektivitas Kondensor Di PLTU PT. Semen Tonasa Btg Unit I 2×25 MW

PoliGrid ◽  
2021 ◽  
Vol 2 (1) ◽  
pp. 20
Author(s):  
Jamal Chandra Bhuana ◽  
Irfan Muh ◽  
Aqsha Maulana
Keyword(s):  
Flow Rate ◽  
Water Flow Rate ◽  
Cooling Water ◽  
Steam Pressure ◽  
Inlet Temperature ◽  
Outlet Temperature ◽  
Steam Temperature ◽  
Control Room ◽  
Steam Power ◽  
Cooling Water Flow Rate

Abstract: This research was conducted to determine the effect of fouling on the effectiveness of condensers in the Steam Power Plant (PLTU) PT. Semen Tonasa. The research method used is data collection in the central control room PLTU PT. Semen Tonasa. Steam temperature inlet condenser (Thin), temperature of condensate water  (Thout), steam pressure inlet condenser (Ps), pressure of cooling water (Pcw), inlet temperature (Tcin) and outlet temperature of cooling water (Tcout), steam flow rate ( and cooling water flow rate () is the data needed in this research. Data were analyzed to get the value of effectiveness, number transfer of units (NTU), capacity ratio (C), log mean temperature different (LMTD) of the condenser. The results of the analysis showed that the decrease in condenser performance was influenced by the effect of fouling. Overhaul is done every 2 years. There was a decrease in NTU's value of 31.69% and an effective value of 22.29% in the period April 2016 to March 2018.

scholarly journals Sizing Methodology of a Multi-Mirror Solar Concentrated Hybrid PV/Thermal System

Energies ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 3276 ◽  
Author(s):  
Mohamed Gomaa ◽  
Ramadan Mustafa ◽  
Hegazy Rezk ◽  
Mujahed Al-Dhaifallah ◽  
A. Al-Salaymeh
Keyword(s):  
Thermal Efficiency ◽  
Concentration Ratio ◽  
Cooling System ◽  
Flat Glass ◽  
Cooling Water ◽  
Coolant Fluid ◽  
Inlet Temperature ◽  
Cooling Water Temperature ◽  
Inclination Angles ◽  
Linear Fresnel Reflector

The use of a concentrated photovoltaic (CPV) system significantly reduces the required solar cell area that often accounts for the major cost of a PV solar system. A comprehensive performance analysis of a multi-mirror solar concentrated hybrid PV thermal (CPVT) system was conducted. Among different concentrating systems, Linear Fresnel Reflector (LFR) systems are more effective due to their simplicity of operation and low fabrication cost. A mathematical model and the simulation of a CPVT system employing a linear configuration and horizontal absorber is developed here in order to evaluate its performance parameters, using a FORTRAN programing technique. The concentrator system consists of, different width of flat glass mirrors placed under various inclination angles, focusing sunlight on to the PV solar cells mounted along the active cooling system. The effect of focus distance on concentration ratio, collector width, and heat gained by the coolant fluid are investigated. All parameters of the linear Fresnel reflector solar concentrator system are determined and the effect of cooling mass flow rate and cooling inlet temperature upon the system performance is evaluated. With regards to simulation results obtained via the focus distances, the width of mirrors decreased by increasing the number of mirrors, and in turn by increasing the focus distances, this resulted in an increase in CR values. For the specific number of mirrors, concentration ratio increased simultaneously increasing the focus distance; furthermore, increasing the number of mirrors resulted in a reduction in both the width of the mirrors and their inclination angles, and an increase in CR values. The results further confirmed that the total (combined electrical-thermal) efficiency is higher than that of the individual electrical as well as thermal efficiency; reaching approximately 80% and showed no sensitivity to the rises in cooling water temperature for temperature cases under consideration.

Experimental Research on Heat Transfer of Closed Cooling Tower with Packing

2014 ◽  
Vol 960-961 ◽  
pp. 614-620 ◽  
Author(s):  
Ya Su Zhou ◽  
Xiao Ding ◽  
Wei Xie
Keyword(s):  
Water Flow ◽  
Flow Rate ◽  
Cooling Tower ◽  
Water Flow Rate ◽  
Cooling Water ◽  
Cocurrent Flow ◽  
Inlet Temperature ◽  
Cooling Performance ◽  
Cooling Water Flow Rate ◽  
Better Than

Three different structural types of closed cooling tower (CCT) and two cooling water flow directions were considered. The experimental study were done on the cooling performance of influences of inlet air dry and wet bulb temperature, cooling water flow rate and inlet temperature, air flow rate and spray density. The experimental results show that the cooling performance of CCT with packing is obviously better than non-packing cooling tower in 7%~18.4%. And the cooling performance of CCT with packing on top and coil underneath is slightly better than CCT with coil on top and packing underneath in 4.9%. In the same conditions the cooling performance of CCT with packing under cooling water cocurrent-flow is better than that cooling water countercurrent-flow in 3.2%~9.6%. Therefore, the closed cooling tower structure with the cooling water path in bottom and out top, and with packing on top and coil underneath is recommended.

Efficient Replacement of Centrifugal With Absorption Chillers Upgrading the Heat Transfer of the Cooling Tower

2001 ◽  
Author(s):  
E. D. Rogdakis ◽  
V. D. Papaefthimiou
Keyword(s):  
Flow Rate ◽  
Cooling Tower ◽  
Water Flow Rate ◽  
Cooling Water ◽  
Double Effect ◽  
Operating Conditions ◽  
Cooling Power ◽  
Absorption Chiller ◽  
Absorption Chillers ◽  
Cooling Water Flow Rate

Abstract It is a general trend today, the old centrifugal machines to be replaced by new absorption machines. The mass flow rate of the cooling water in the centrifugal machines is normally 30% less than that in the two-stage absorption chiller for the same refrigerating capacity. Some absorption chillers manufacturers have updated and improved the double-effect technology increasing the cooling water temperature difference from the typical value of 5.5°C to 7.4°C and reducing the cooling water flow rate by about 30%. Using such a modern double effect absorption unit to replace a centrifugal chiller the same cooling water circuit can be used and the total cost of the retrofit is minimized. In this case a new flow pattern of the cooling tower is developed, and in this paper the design of a new tower fill is predicted taking into account the new factors characterizing the operating conditions and the required performance of the tower. As an example, the operational curves of a modified cooling tower (1500 KW cooling power) used by a 240 RT double-effect absorption chiller are presented.

Effect of the cooling water flow rate to control self-heating of coal in a cylindrical reactor heated by a hot plate heater

2020 ◽  
Author(s):  
Sofi Hesti Fathia ◽  
Inkasandra Faranisa Kolang ◽  
Ricky Putro Satrio Wicaksono ◽  
Achmad Riadi ◽  
Yulianto Sulistyo Nugroho
Keyword(s):  
Water Flow ◽  
Flow Rate ◽  
Water Flow Rate ◽  
Cooling Water ◽  
Hot Plate ◽  
Self Heating ◽  
Cooling Water Flow Rate ◽  
Cylindrical Reactor ◽  
Plate Heater

High Performance and Sub-Ambient Silicon Microchannel Cooling

2006 ◽  
Author(s):  
E. G. Colgan ◽  
B. Furman ◽  
M. Gaynes ◽  
N. LaBianca ◽  
J. H. Magerlein ◽  
...  
Keyword(s):  
Thermal Resistance ◽  
High Performance ◽  
Water Flow Rate ◽  
Cooling Water ◽  
Interface Layer ◽  
Inlet Temperature ◽  
Chip Surface ◽  
Thermal Interface ◽  
Performance Improvements ◽  
Average Unit

High performance single-phase Si microchannel coolers have been designed and characterized in single chip modules in a laboratory environment using either water at 22°C or a fluorinated fluid at temperatures between 20 and −40°C as the coolant. Compared to our previous work, key performance improvements were achieved through reduced channel pitch (from 75 to 60 microns), thinned channel bases (from 425 to 200 microns of Si), improved thermal interface materials, and a thinned thermal test chip (from 725 to 400 microns of Si). With multiple heat exchanger zones and 60 micron pitch microchannels with a water flow rate of 1.25 lpm, an average unit thermal resistance of 15.9 C-mm2/W between the chip surface and the inlet cooling water was demonstrated for a Si microchannel cooler attached to a chip with Ag epoxy. Replacing the Ag epoxy layer with an In solder layer reduced the unit thermal resistance to 12.0 C-mm2/W. Using a fluorinated fluid with an inlet temperature of −30°C and 60 micron pitch microchannels with an Ag epoxy thermal interface layer, the average unit thermal resistance was 25.6 C-mm2/W. This fell to 22.6 C-mm2/W with an In thermal interface layer. Cooling >500 W/cm2 was demonstrated with water. Using a fluorinated fluid with an inlet temperature of −30°C, a chip with a power density of 270 W/cm2 was cooled to an average chip surface temperature of 35°C. Results using both water and a fluorinated fluid are presented for a range of Si microchannel designs with a channel pitch from 60 to 100 microns.

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