Experimental Analysis Of Effectiveness In The Plate Heat Engineering Essay

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Engineering applications, one of the most important and most common procedures, different temperatures is the heat exchange between two or more fluids. This change was made devices are usually referred to as heat exchangers. Recently, plate heat exchangers, heating, heating-cooling applications, the food and cosmetic industries are heavily used.

Plate heat exchangers used in this study as the basis of heat transfer surfaces, is usually made of thin metal sheets. These metal surfaces can be straight or wavy manner. Plate heat exchangers, sealing plate, spiral plate and fins can be analyzed in three groups. Heating, cooling and ventilation applications, they need higher productivity, economic discrimination and a compact design that will reach through plate heat exchangers. Plates in various sizes and materials for a wide range of choices, plate heat exchangers provide superior flexibility. This flexibility gives great advantage in many thermal processes to plate heat exchangers. Plate heat exchangers are usually higher than the shell-tube type heat exchangers have the total heat transfer coefficient [1-3]. A plate heat exchangers structure is shown in Figure 1 [4].

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Figure 1. Plate heat exchangers structure

Constant pressure plate

The first plate

Plate heat exchanger gaskets

End plate

Moving pressure plate

Top bar carrier

Lower carrier bars

Support column

Torsion proof clamping bolts

Connection bolts

There are many studies related to plate heat exchangers in the literature [5-15]. In this study, a plate heat exchanger used for heating and cooling systems have been designed as experimentally and effectiveness values of plate heat exchanger have investigated for different temperatures and flow rates.

2. THERMODYNAMIC ANALYSIS

Experiments were carried out for different flow rate and temperature values.Theme asured variables were the inlet-outlet water temperatures and the flow rate of hot and cold water,respectively.The heat transfer rate in the heat exchanger is defined as:

(1)

Heat capacity for hot and cold fluids:

(2)

(3)

The effectiveness of heat exchanger is given as:

(4)

(5)

or

(6)

Here the maximum possible heat transfer rate Qmax is determined as:

(7)

Where Cmin represents the smaller of heat capacity for hot and cold fluids.

3. EXPERIMENTAL ANALYSIS

Experimentally, heating-cooling system used in plate heat exchanger was designed and constructed. The experimental system was operated for heating and cooling case. Experiments were carried out in the different temperature and flow rate values. Basically, the experimental set-up consists of plate heat exchanger for heating case, plate heat exchanger for cooling case, two heater, hot water tank, refrigeration system with compressor, cold water tank, flow meters, pumps, valves, expand box and thermocouples. Experimental system is also schematically shown in Fig. 2.

Fig.2. Schematically experimental setup

The data were collected by computer controlled data logger. Flow rates, inlet and outlet temperatures of the water were measured and recorded continuously throughout the experiment. The plate heat exchangers used in experiments are in countercurrent flow. Further details of the experimental procedure can be found in Ref. [5]. The detailed geometric characteristics of the corrugated plate are given in Table 1.

Table 1. Geometric characteristics of a corrugated plate

Plate length

0,48 m

Plate width

0,296 m

Total Number of Plates

6

Heat transfer area

0,16 m2

Plate Material

0.5 mm SS AISI 316

Gasket Material

EPDM

4. RESULT AND DISCUSSION

Fig. 3 illustrates the variations of the heat transfer rate and effectiveness values with hot water inlet temperature for 0,67 m3/h volume flow rate. As seen in Fig.3, heat transfer rate and effectiveness values value increase with increasing hot water inlet temperature.

Fig.3 Variation of heat transfer rate and effectiveness values with inlet hot water temperature for 0,67 m3/h

Fig. 4 illustrates the variations of the heat transfer rate and effectiveness values with hot water inlet temperature for 0,95 m3/h volume flow rate.

Fig.4 Variation of heat transfer rate and effectiveness values with inlet hot water temperature for 0,95 m3/h

Fig. 5 illustrates the variations of the heat transfer rate and effectiveness values with hot water inlet temperature for 1,16 m3/h volume flow rate.

Fig.5 Variation of heat transfer rate and effectiveness values with inlet hot water temperature for 1,16 m3/h

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Fig. 6 illustrates the variations of the heat transfer rate and effectiveness values with hot water inlet temperature for 1,05 m3/h volume flow rate.

Fig.6 Variation of heat transfer rate and effectiveness values with inlet hot water temperature for 1,05 m3/h

Fig. 7 illustrates the variations of the heat transfer rate and effectiveness values with hot water inlet temperature for 1,13 m3/h volume flow rate.

Fig.7 Variation of heat transfer rate and effectiveness values with inlet hot water temperature for 1,13 m3/h

Fig. 8 illustrates the variations of the heat transfer rate and effectiveness values with hot water inlet temperature for 1,15 m3/h volume flow rate.

Fig.8 Variation of heat transfer rate and effectiveness values with inlet hot water temperature for 1,15 m3/h

5. CONCLUSIONS

Engineering applications, one of the most important and most common procedures, different temperatures is the heat exchange between two or more fluids. This change was made devices are usually referred to as heat exchangers. Recently, plate heat exchangers, heating, heating-cooling applications, the food and cosmetic industries are heavily used.

In this study, effectiveness analysis and heat transfer analysis of the experimental plate heat exchanger are presented. Effect of inlet hot and cold water temperature on the effectiveness and heat transfer are investigated. It is found that the heat transfer rate and effectiveness increases with increasing hot water inlet temperatures at various volume flow rate. As expected, the heat transfer rate and effectiveness increases with increasing inlet temperatures.

ACKNOWLEDGEMENT

This work was supported by the Scientific and Technological Research Council of Turkey (TUBITAK) with 107M004 project number. Authors gratefully acknowledge The Scientific and Technological Research Council of Turkey (TUBITAK), Turkey, for the financial assistance.