Numerical Investigation of a Shell and Coil Tube Heat Exchanger used in Solar Domestic Hot Water System

2020 ◽  
pp. 195-207
Author(s):  
Ashutosh Rout ◽  
Taraprasad Mohapatra ◽  
Sachindra Kumar Rout ◽  
Dillip Kumar Biswal
Keyword(s):  
Heat Exchanger ◽  
Numerical Investigation ◽  
Water System ◽  
Hot Water ◽  
Domestic Hot Water ◽  
Tube Heat Exchanger

Low return temperature from domestic hot-water system based on instantaneous heat exchanger with chemical-based disinfection solution

Energy ◽  
2021 ◽  
Vol 215 ◽  
pp. 119211
Author(s):  
Theofanis Benakopoulos ◽  
Michele Tunzi ◽  
Robbe Salenbien ◽  
Dirk Vanhoudt ◽  
Svend Svendsen
Keyword(s):  
Heat Exchanger ◽  
Water System ◽  
Hot Water ◽  
Domestic Hot Water

Air Conditioning Waste Heat to Domestic Hot Water: A Student Design Project

2007 ◽  
Author(s):  
Emin Yilmaz
Keyword(s):  
Heat Exchanger ◽  
Heat Pump ◽  
Literature Search ◽  
Waste Heat ◽  
Mechanical Systems ◽  
Hot Water ◽  
Water Heater ◽  
Domestic Hot Water ◽  
Tube Heat Exchanger ◽  
Design Project

The goal of the “Domestic Hot Water Heater Using Air Conditioner (A/C) Waste Heat” design project was to introduce students to designing mechanical systems in the “ETME475-Mechanical Systems Design” course. The design project was assigned to two Mechanical Engineering Technology students as their second design project in the course. Students were asked to do their own literature search and create their own designs. Both of them decided to use a concentric-tube heat exchanger to extract heat from hot refrigerant gas to heat water residing in domestic hot water heater tank. Their literature search led them to some manufacturers. Since delivery time for concentric-tube heat exchanger was too long, we purchased a side-by-side-tube heat exchanger and got it installed on our Heat Pump. Some test runs were conducted to measure the efficiency of the unit and its effect on the Coefficient of Performance (COP) of the Heat Pump when heat pump is operated in A/C mode. Contrary to our expectations, results indicate that, COP values have been reduced by about 22%. Measured efficiency of the unit was about 18%. Students have designed a concentric-tube heat exchanger, turned in their final reports and orally presented their designs to the class.

Performance of Solar Domestic Hot Water Systems at the National Bureau of Standards—Measurements and Predictions

1983 ◽  
Vol 105 (3) ◽  
pp. 311-321 ◽  
Author(s):  
A. H. Fanney ◽  
S. A. Klein
Keyword(s):  
Heat Exchanger ◽  
Water System ◽  
Water Systems ◽  
Hot Water ◽  
Time Interval ◽  
National Bureau ◽  
Domestic Hot Water ◽  
Direct System ◽  
System A ◽  
One Year

The thermal performance of six solar domestic hot water systems and a conventional hot water system have been carefully monitored by the National Bureau of Standards in Gaithersburg, Maryland. The system configurations include an evacuated-tube air system with a crossflow heat exchanger and two storage tanks, a single-tank direct system, a double-tank direct system, a single-tank indirect system with a wrap-around heat exchanger, a double-tank indirect system with a coil-in-tank heat exchanger, and a thermosyphon system. Results are presented for a one-year time interval commencing January 1980. This paper includes a detailed description of the hot-water systems, experimental test results, and comparisons with computer predictions using the f-chart method [1].

Experimental Investigation of Heat Transfer Enhancement by Using Different Number of Fins in Circular Tube

2018 ◽  
Vol 6 (3) ◽  
pp. 1-12
Author(s):  
Kamil Abdul Hussien
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Cold Water ◽  
Finned Tube ◽  
Hot Water ◽  
Copper Tube ◽  
Smooth Tube ◽  
Tube Heat Exchanger ◽  
Mass Flow Rates ◽  
Flow Heat

Abstract-The present work investigates the enhancement of heat transfer by using different number of circular fins (8, 10, 12, 16, and 20) in double tube counter flow heat exchanger experimentally. The fins are made of copper with dimensions 66 mm OD, 22 mm ID and 1 mm thickness. Each fin has three of 14 mm diameter perforations located at 120o from each to another. The fins are fixed on a straight smooth copper tube of 1 m length, 19.9 mm ID and 22.2 mm OD. The tube is inserted inside the insulated PVC tube of 100 mm ID. The cold water is pumped around the finned copper tube, inside the PVC, at mass flow rates range (0.01019 - 0.0219) kg/s. The Reynold's number of hot water ranges (640 - 1921). The experiment results are obtained using six double tube heat exchanger (1 smooth tube and the other 5 are finned one). The results, illustrated that the heat transfer coefficient proportionally with the number of fin. The results also showed that the enhancement ratio of heat transfer for finned tube is higher than for smooth tube with (9.2, 10.2, 11.1, 12.1 13.1) times for number of fins (8, 10, 12, 16 and 20) respectively.

scholarly journals Effect of Twisted Fin Array in a Triple-Tube Latent Heat Storage System during the Charging Mode

2021 ◽  
Vol 13 (5) ◽  
pp. 2685
Author(s):  
Mohammad Ghalambaz ◽  
Jasim M. Mahdi ◽  
Amirhossein Shafaghat ◽  
Amir Hossein Eisapour ◽  
Obai Younis ◽  
...  
Keyword(s):  
Energy Storage ◽  
Heat Exchanger ◽  
Latent Heat ◽  
Thermal Energy ◽  
Heat Storage ◽  
Hot Water ◽  
Melting Time ◽  
Latent Heat Storage ◽  
Tube Heat Exchanger ◽  
Storage Rate

This study aims to assess the effect of adding twisted fins in a triple-tube heat exchanger used for latent heat storage compared with using straight fins and no fins. In the proposed heat exchanger, phase change material (PCM) is placed between the middle annulus while hot water is passed in the inner tube and outer annulus in a counter-current direction, as a superior method to melt the PCM and store the thermal energy. The behavior of the system was assessed regarding the liquid fraction and temperature distributions as well as charging time and energy storage rate. The results indicate the advantages of adding twisted fins compared with those of using straight fins. The effect of several twisted fins was also studied to discover its effectiveness on the melting rate. The results demonstrate that deployment of four twisted fins reduced the melting time by 18% compared with using the same number of straight fins, and 25% compared with the no-fins case considering a similar PCM mass. Moreover, the melting time for the case of using four straight fins was 8.3% lower than that compared with the no-fins case. By raising the fins’ number from two to four and six, the heat storage rate rose 14.2% and 25.4%, respectively. This study presents the effects of novel configurations of fins in PCM-based thermal energy storage to deliver innovative products toward commercialization, which can be manufactured with additive manufacturing.

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