 Open Access
 Total Downloads : 0
 Authors : Hairil Budiarto , Sigit Susanto Putro
 Paper ID : IJERTV7IS100070
 Volume & Issue : Volume 07, Issue 10 (October – 2018)
 Published (First Online): 05012019
 ISSN (Online) : 22780181
 Publisher Name : IJERT
 License: This work is licensed under a Creative Commons Attribution 4.0 International License
Prototype of Heat Exchanger UTube Model Shell and Tube Counter Flow (Second Project)
Prototype of Heat Exchanger UTube Model Shell and Tube Counter Flow
(Second Project)
Hairil Budiarto
Departement of Mechatronics Engineering Trunojoyo University of Madura Bangkalan, East Java Indonesia
Abstract The objective of this research is to be discussed about the results of the study of the manufacture of the Heat Exchanger Cooler type UTube with 2 types of fluid namely: Water as cold fluid and Oil as a hot fluid where the flow direction of each fluid is counter flow. In this research also uses 2 kind of method, first method is empirical method which is using some formula to identification the impact of using UTube as a heat exchanger and second method is practial/experimental method which take datum in real time. This heat exchanger using diffrent pump there are water pump and oil pump with adding the same static variable in the form of oil pump avarage flowrate and Temprature is about 9.64 L/min and 95,17oC, water pump average flowrateand temprature is about 30,42 L/min and 30,50 oC. The material of tubes was made from cooper tube with diameter 4mm for inner inlet and 6mm for outer inlet, total 31 tube cooper shaped U with 1000mm length. From the experimental method proves that 58.83% temprature drop was occured in this type of heat exchanger.
Keywords Heat Exchanger, Counter Flow , U Tube, Fluids, Cooler, Flowrate

INTRODUCTION
Heat exchangers are offtheshelf equipment targeted to the efficient transfer of heat from a hot fluid flow to a cold fluid flow, in most cases through an intermediate metallic wall and without moving parts. There many different types of heat exchangers; some more appropriate for certain environments than others. Some have builtin dividers to separate the heat storage, while others allow the mixing of heat. Counterflow Exchangers push the cold fluid from one direction of the exchanger while the hot will enter from the other direction and they will flow past each other. Counterflow exchangers are often considered the most efficient at transferring heat.

LITERATURE REVIEW

Shell and Tube Heat Exchanger
The shellandtube heat exchanger (STHE) is the most common type of heat exchanger. It originated from the jacketedcoil distiller, and is used in heavy industries (steam condensers, boilers), and residential hotwater and heating systems (firetube water heaters). Several details of STHEs are presented in Fig.1
Sigit Susanto Putro
Departement of Informatics Engineering Trunojoyo University of Madura Bangkalan, East JavaIndonesia
Fig. 1. Schematic diagram of a STHX with one shell pass and one tube passMaintaining the Integrity of the Specifications

Heat Exchanger Analysis
The thermal analysis of a heat exchanger is based on the simple coaxial configuration (Fig. 2), where one fluid goes along a pipe, and the other fluid goes along the annular section within a larger cylindrical sheath with openings at the ends, and in particular, to the countercurrent configuration shown in Fig. 2a, more thermallyefficient than the coflow setup of Fig. 2b. The coaxial crosssection is sketched in Fig. 2c. Longitudinal temperatureprofiles for the counterflow and the coflow configurations are also shown, and a detail of the transversal temperature profile across the wall separating the two fluids (Fig. 2d). The minimum temperature jump from one fluid to the other is called the (temperature) approach of the heat exchanger.
Fig. 2. Simple annular heat exchanger : a) sketch and temprature profile in a counter flow configuration, b) sketc and temprature profile in coflow, c) crosssection sketch, d) detail accros the separating surface


RESEARCH APPROACH
This research used 2 methods of analysis, there are : experimental methods that have been made in the previous journal and the theoretical methods that will be discussed in this journal. In the theoretical method will analyze the heat exchanger using several formulas

Teoritical/Emprical Method
This method uses the formula to do a quantity of heat transfer that occurs in the tube, the calculation of the heat exchanger prototype analysis, determined by a default setting as follows :

Discharge on water pump spcified by 10 liters/min

Flowrate at the oil pump specified by 5 litres/minute

Tcold, in (waterin temperature) = 25oC.

Thot, in ( oilin temperature) = 60oC.


Practical/Actual Method
Practical/actual method is retrieving data from a device that is read by sensors installed around the tube, the data that will be taken is the data from the the temprature sensor and flowrate sensor.


RESULT
Calculation of the heat exchanger analysis is determined by default setting :
Properties on Heat Exchanger

Q (debit) air = 30 liter/menit

Q (debit) oli = 9 liter/menit

Tcold,in (temperature water in) = 30o C

Thot,in (temperature oil in) = 100o C
The prototype heat exchanger model follows the bank's staggered tube model, as shown in Fig 2
Fig. 3. Staggered tube bank
With default setting as follows :
SL = 0,02 m
D = 0,004 m
ST = 0,02 m

Tcold,in = 25oC

Thot,in = 60oC

Qpump water = 10 l/min
The first step in the NTU method is determine the heat capacity rates of the hot and cold fluids and identity the smaller one. Based on thermal table we can conclude that :
water (30oC) = 996 kg/m3.
oil (100oC) = 840 kg/m3
Cp.hot (oil), oil= 100oC = 2220 Cp.cold (water) , Twater =30oC = 4178
Calculation of mo water using formula1 as follows :
Calculation of mo oil using formula1 as follows :
Calculate heat capacity rate using formula as follows :
Calculate heat capacity ratecool (water) using formula as follows :
Calculate Cmin = Ch (oil) = 0,28 K.W/oC
Calculate heat transferrate maximum
To calculate heat transfer on surface area using formula as follows :
To find the value from NTU on the heat exchanger, it must first find the U value, using the equation:
The next step is to find the value from NTU using the equation:
To find the value of the effectiveness of the heat exchanger, with the value of C = 0.134 and the value of NTU = 1.00, then by looking at figure 1326, in Yunus.A Cangel's book, page 695, in table C, so the value of effectiveness can be define as follows :
So to find the actual rate value of the heat exchanger, follow the equation:
To determine the outlet temperature of the cold and the hot fluid stream, it is determined by the equation:
To find the value of T_ (c, out), in water (the temperature of the water out) using the equation :
So we can define the value of T oil out using equation :
Based on the actual data from the prototype heat exchanger that already presented in the previous journal, the average temperature data was obtained:

WaterIn = 30oC

Temprature WaterOut = 33oC

Temprature OilIn = 100oC

Temprature OilOut = 45.06oC
As for the results of calculations using a mathematical model, the results of the temperature of the water coming out and the temperature of the oil out are:

Temprature WaterOut = 35oC

Temprature OilOut = 39oC
By comparing the results of actul data and empirical data, for the prototype of the U tube heat exchanger model the effectiveness of the heat exchanger will be calculated by equation as follows :


CONLUSION
From the research that has been done and the data that has been obtained, that the calculation data shows that there is a decrease in oil temperature at 45oC and according to the actual data there is a decrease in temperature at 39 oC. By comparing the results of actual data and empirical data, for the prototype of the U tube heat exchanger model the effectiveness of the heat exchanger about 86%, it proves that heat exchanger type UTube with Counter Flow has the best design for Dropping the Temprature

REFRENCES