scholarly journals Thermoelectric Water Cooler and Heater with Intermediate Water Tank

2019 ◽  
Vol 8 (6) ◽  
pp. 3424-3427
Keyword(s):  
Cold Water ◽  
Thermoelectric Module ◽  
Hot Water ◽  
Coefficient Of Performance ◽  
Thermal Mass ◽  
Intermediate Water ◽  
Water Tank ◽  
Thermoelectric Modules ◽  
Heating And Cooling ◽  
Water Tanks

This paper presents a mathematical model to investigate the effect of intermediate water tank for cascade configuration of thermoelectric modules in heating and cooling application. The system consists of two thermoelectric modules separated by an intermediate water tank. Another surface of each thermoelectric module is in contact with cold water tank or hot water tank. In the simulation, both hot and cold water tanks consist one kilogram of water. The mass of water in the intermediate water tank was set to 0.01 kg (negligible thermal mass), 1 kg (equal thermal mass) and 10 kg (large thermal mass). Set point for hot and cold water tanks was 373 K and 276 K, respectively. It was found that intermediate water tank with higher thermal mass enable a better temperature control and produces higher Coefficient of Performance for both thermoelectric modules. These findings are essential for the development of a three-stage temperature water dispenser using thermoelectric modules

Numerical Analysis of the Performance of Dual-Tank with Movable Baffle for Heat Pump Water Heater

2013 ◽  
Vol 331 ◽  
pp. 88-93
Author(s):  
Li Zhong Yang ◽  
Jie Wu ◽  
Ya Cai Hu ◽  
Rong Hua Hong
Keyword(s):  
Heat Pump ◽  
Cold Water ◽  
Heating Temperature ◽  
Hot Water ◽  
Water Tank ◽  
Nickel Steel ◽  
Water Heater ◽  
Heat Pump Water Heater ◽  
New Type ◽  
Water Tanks

The design of a new type of water tank for heat pump water heater is proposed. A movable baffle is set in the cylindrical water tank to prevent the mixture of hot and cold water in order to enable more hot water available for utilizing. The COP of the heat pump cycle increased due to the decrease of initial heating temperature, thus energy is saved. By numerical calculation, the performance of the new design is significantly better than previous water tanks. Comparing with the floating plate tank and common natural stratification tank, in the condition of water leaking 3% and Chrome-nickel steel wall, the available hot water efficiency of dual-tank with movable baffle is 40% and 50% higher and the energy consumption 12.3% and 13.9% lower. Moreover, little water leaking could increase the available hot water.

scholarly journals Experimental Investigation of Evaporative Hybrid Water Cooler

2021 ◽  
Author(s):  
Swapnil S Bandgar ◽  
Suhas D Jagtap
Keyword(s):  
Temperature Difference ◽  
Cold Water ◽  
Evaporative Cooling ◽  
Thermoelectric Module ◽  
Cost Effective ◽  
Hot Water ◽  
Easy Access ◽  
Peltier Effect ◽  
Water Tank ◽  
Water Cooler

The water cooler is a device which cools and dispenses water which is used to provide easy access to drinking water. The water coolers which are currently available in the market are works on the concept of VCR (Vapour Compression Refrigeration) System. These water coolers consume high electric power almost 250-350W, these systems also have huge impacts on the ecosystem due to CFC and HCFC emissions. Best alternative for existing VCR based water cooler is the system of evaporative cooling with thermoelectric cooler having affordable cost and eco-friendly. Hybrid water cooler works on the principle of evaporative cooling and Thermoelectric cooling, which provides cold water, hot water and it works as an Air cooler also. Evaporative cooling works on concept of evaporation of water and rate of evaporation is totally depending on humidity of surrounded air. By using evaporative cooling obtain the temperature difference of 8-10°C. During the hot day, the temperature of water in the water tank would be 40°C, then the evaporative cooling alone will not be sufficient to cool the water to 22°C, which is ideal temperature of water for drinking purpose. So, thermoelectric module works on principle of Peltier effect which can produce the temperature difference across its surfaces on applying potential difference across its terminals. As the thermoelectric module produce the temperature difference up to 40°C across its surface, it can easily cool the water to 20°C. More than 60% energy could be obtained by this system in comparison with respect to existing VCR based cooler, so this system can be used as an eco- friendly and cost effective.

scholarly journals Fabrication of Instant Water Cooler Using Thermoelectric Module

2021 ◽  
pp. 1130-1134
Author(s):  
Bhushan Hirudkar ◽  
Prajwal Yesansure ◽  
Mayur Maurya ◽  
Vihang Chaudhary ◽  
Jayshri Tagde ◽  
...  
Keyword(s):  
Cold Water ◽  
Thermoelectric Module ◽  
Heating System ◽  
Hot Water ◽  
Peltier Effect ◽  
Electric Heater ◽  
Water Heater ◽  
Peltier Element ◽  
Heating And Cooling ◽  
Water Cooler

Hot and cold water is always needed for human being and we use different systems to get hot and cold water. The devices which are available in market for heating and cooling purpose have more costly and heavy like refrigerator, electric heater and solar water heater. So, we decide to make project on “fabrication of instant water cooler using thermoelectric module to get cold water and hot water at same time.” Peltier effect is used to get cold as well as hot water at same time with cheapest cost and applicable to use in residential area also. Our aim is toward developing a system which will provide cooling and heating effect at same time without moving mechanical parts. Thermoelectric cooling and heating system not require working fluids. This device can be used to cool water without refrigerants. And simultaneously heating can be achieved from the hot side of thermoelectric module to heat the water, this because of heat absorption and rejection using Peltier element. This compact design is very useful in elimination of CFC and it would replace refrigeration system.

Design and experimental analysis of a solar thermoelectric heating, ventilation, and air conditioning system as an integral element of a building envelope

2018 ◽  
Vol 40 (2) ◽  
pp. 220-236 ◽  
Author(s):  
Irfan Ahmad Gondal
Keyword(s):  
Experimental Analysis ◽  
Air Conditioning ◽  
Energy Use ◽  
New Technologies ◽  
Thermoelectric Module ◽  
Electrical Current ◽  
Building Envelope ◽  
Coefficient Of Performance ◽  
Heating And Cooling ◽  
Cooling Effects

This study presents an innovative concept of a compact integrated solar-thermoelectric module that can form part of the building envelope. The heating/cooling modes use the photovoltaic electrical current to power the heat pump. The experimental analysis was carried out and the results of coefficient of performance were in the range 0.5–1 and 2.6–5 for cooling and heating functions, respectively. The study demonstrates that thermoelectric cooler can effectively be used for heating, ventilation, and air conditioning applications by integrating with solar panels especially in cooling applications. The system is environmentally friendly and can contribute in the implementation of zero energy buildings concept. Practical application: In order to help address the challenge of climate change and associated environmental effects, there is continuous demand for new technologies and applications that can be readily integrated into day-to-day life as a means of reducing anthropogenic impact. Heating, ventilation, and air conditioning, as one of the largest energy consumers in buildings, is the focus of many researchers seeking to reduce building energy use and environmental impact. This article proposes using facades and windows that have an integrated modules of solar photovoltaic cells and thermoelectric devices that are able to work together to achieve heating and cooling effects as required by the building without requiring any external operational power.

Determinants of Legionella pneumophila Contamination of Water Distribution Systems: 15-Hospital Prospective Study

1987 ◽  
Vol 8 (9) ◽  
pp. 357-363 ◽  
Author(s):  
Richard M. Vickers ◽  
Victor L. Yu ◽  
S. Sue Hanna ◽  
Paul Muraca ◽  
Warren Diven ◽  
...  
Keyword(s):  
Legionella Pneumophila ◽  
Distribution System ◽  
Distribution Systems ◽  
Water Distribution ◽  
Cold Water ◽  
Physicochemical Characteristics ◽  
Hot Water ◽  
Environmental Study ◽  
Water Tank ◽  
One Year

AbstractWe conducted a prospective environmental study for Legionella pneumophila in 15 hospitals in Pennsylvania. Hot water tanks, cold water sites, faucets, and show-erheads were surveyed four times over a one-year period. Sixty percent (9/15) of hospitals surveyed were contaminated with L pneumophila. Although contamination could not be linked to a specific municipal water supplier, most of the contaminated supplies came from rivers. Parameters found to be significantly associated with contamination included elevated hot water temperature, vertical configuration of the hot water tank, older tanks, and elevated calcium and magnesium concentrations of the water (P < 0.05). This study suggests that L pneumophila contamination could be predicted based on design of the distribution system, as well as physicochemical characteristics of the water.

Experimental Study of Heating-Cooling Combined Ground Source Heat Pump System with Horizontal Ground Heat Exchanger

2011 ◽  
Vol 374-377 ◽  
pp. 398-404 ◽  
Author(s):  
Ying Ning Hu ◽  
Ban Jun Peng ◽  
Shan Shan Hu ◽  
Jun Lin
Keyword(s):  
Heat Exchanger ◽  
Heat Exchange ◽  
Heat Pump ◽  
Hot Water ◽  
Coefficient Of Performance ◽  
Ground Heat Exchanger ◽  
Pipe Length ◽  
Pump System ◽  
Heat Pump System ◽  
Heating And Cooling

A hot-water and air-conditioning (HWAC) combined ground sourse heat pump(GSHP) system with horizontal ground heat exchanger self-designed and actualized was presented in this paper. The heat transfer performance for the heat exchanger of two different pipe arrangements, three layers and four layers, respectively, was compared. It showed that the heat exchange quantity per pipe length for the pipe arrangement of three layers and four layers are 18.0 W/m and 15.0 W/m. The coefficient of performance (COP) of unit and system could remain 4.8 and 4.2 as GSHP system for heating water, and the COP of heating and cooling combination are up to 8.5 and 7.5, respectively. The power consumption of hot-water in a whole year is 9.0 kwh/t. The economy and feasibility analysis on vertical and horizontal ground heat exchanger were made, which showed that the investment cost per heat exchange quantity of horizontal ground heat exchanger is 51.4% lower than that of the vertical ground heat exchanger, but the occupied area of the former is 7 times larger than the latter's.

The Device of the Automatic Backflow in Solar Water Heater-Temperature Control and Backflow for Pipe of Water Heater

2013 ◽  
Vol 827 ◽  
pp. 99-104
Author(s):  
Bin Li ◽  
Xi Chen ◽  
Xin Hao Li ◽  
Lu Kuan Ma ◽  
Wen Bo Lu ◽  
...  
Keyword(s):  
Water Resources ◽  
Cold Water ◽  
Hot Water ◽  
Water Tank ◽  
Solar Water Heater ◽  
Recycle Water ◽  
Delay Effect ◽  
Water Heater ◽  
Domestic Water ◽  
Solar Water

Now in general use in solar water heater, there is a long pipeline between water heater and tap, we have to empty the stored cold water before we use the hot water; and usually the water cannot meet required temperature due to the heating delay effect, thus the water also should be emptied, which leads to a waste of water resources. In order to solve this water wastage, we propose a device which can help to control the temperature and backflow of the water in water heater. The device accomplishes backflow of cold water automatically under the effect of gravity, and refluxed water will be stored in the recycle-water tank, thus ensuring the result that the water temperature satisfies the requirement. After the recycle-water tank is full, it will trigger the buoy to control the relay switch, then the water pump start to work to force the water into the water heater tank. Thus, realizing the recycling of water. This device can significantly save water resources in domestic water, and it has a broad market prospect.

Optimum Dimensions of an Obstacle Placed in a Hot Water Tank for Thermal Stratification

2005 ◽  
Vol 23 (5) ◽  
pp. 357-373 ◽  
Author(s):  
Mevlut Arslan ◽  
Necdet Altuntop ◽  
Veysel Ozceyhan ◽  
Mehmet Kanoglu
Keyword(s):  
Solar Collector ◽  
Thermal Stratification ◽  
Cold Water ◽  
Hot Water ◽  
Bottom Surface ◽  
Water Tank ◽  
Cylindrical Tank ◽  
Inlet Channel ◽  
Obstacle Geometry ◽  
Tank Water

Dimension of an obstacle placed in a hot water tank for thermal stratification is optimized numerically. Numerical method is validated using both experimental and numerical results. A cylindrical tank used to store heat for solar collector applications is considered. A cylindrical obstacle with a hole in the middle is placed in the tank and various f/H and g/D ratios of the obstacle geometry are considered. Here H and D are the height and diameter of the tank, respectively, where f is the distance from the bottom surface of the tank to the cold-water inlet channel and g is the diameter of the hole in the obstacle. Temperature distribution in the tank, water temperature supplied by the tank, and temperature differences at various tank inlet and outlets are obtained for various f/H and g/D ratios. The results show that placing obstacle in the tank improves thermal stratification, and thus it increases the temperature of water supplied by the tank compared with no obstacle case and that the best thermal stratification is obtained for obstacle dimensions corresponding to g/D ratio of 0.2 and f/H ratio of 0.13.

scholarly journals On the heating and cooling of the body by local application of heat and cold

1922 ◽  
Vol 93 (651) ◽  
pp. 207-212
Keyword(s):  
Body Temperature ◽  
Beneficial Effect ◽  
Cold Water ◽  
The Body ◽  
Hot Water ◽  
Local Application ◽  
Whole Body ◽  
Local Cooling ◽  
Heating And Cooling ◽  
Stimulation Of

The object of this enquiry is to find out how much heat can be gained, or cold lost from the body, by the local cooling or warming of a small part, by cooling the hands in a stream of cold water, warming the feet in a hot foot­ bath, or by a foot-warmer. In order to secure the beneficial effect of open windows, the breathing of cool air of low-vapour tension, and stimulation of body metabolism by such air ventilating the clothed and naked parts of the skin, the general heating of rooms by hot-water coils might be replaced by small heaters kept a few degrees above body temperature and locally applied to each individual, and each under the individual’s control. Electric heaters have been used by aeroplanists placed beneath their outer garments. One of us(l) recently published results showing that heating or cooling the hands can effectively heat or cool the whole body. We record further experiments of a like nature.

scholarly journals Modelling and testing a passive night-sky radiation system

2017 ◽  
Vol 28 (1) ◽  
pp. 76 ◽  
Author(s):  
G.D. Joubert ◽  
R.T. Dobson
Keyword(s):  
Storage Tank ◽  
Cold Water ◽  
Water Storage ◽  
Heating System ◽  
Hot Water ◽  
Theoretical Simulation ◽  
Water Storage Tank ◽  
Heating And Cooling ◽  
Night Sky ◽  
Radiation Cooling

The as-built and tested passive night-sky radiation cooling/heating system considered in this investigation consists of a radiation panel, a cold water storage tank, a hot water storage tank, a room and the interconnecting pipework. The stored cold water can be used to cool a room during the day, particularly in summer. A theoretical time-dependent thermal performance model was also developed and compared with the experimental results and it is shown that the theoretical simulation model captures the experimental system performance to within a reasonable degree of accuracy. A natural circulation experimental set-up was constructed and subsequently used to show that under local (Stellenbosch, South Africa) conditions the typical heat-removal rate from the water in the tank is 55 W/m2 of radiating panel during the night; during the day the water in the hot water-storage tank was heated from 24 °C to 62 °C at a rate of 96 W/m2. The system was also able to cool the room at a rate of 120 W/m3. The results thus confirmed that it is entirely plausible to design an entirely passive system, that is, without the use of any moving mechanical equipment such as pumps and active controls, for both room-cooling and water-heating. It is thus concluded that a passive night-sky radiation cooling/heating system is a viable energy-saving option and that the theoretical simulation, as presented, can be used with confidence as an energy-saving system design and evaluation tool. Keywords: passive cooling and heating, buoyancy-driven fluid flow, theoretical simulation, experimental verification Highlights:Passively driven renewable energy heating and cooling systems are considered.Time-dependent mathematical simulation model is presented.Experimental buoyancy-driven heating and cooling system built and tested.Experimental results demonstrate the applicability of the theoretical simulation model.Saving and evaluation design tool.

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