• Title/Summary/Keyword: Electric water heater

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Analysis on Cascade Cycle Heat Pump Application as Night Storage Heater (심야전력을 이용한 Cascade Heat Pump Cycle의 운전결과 분석)

  • JUNG, H.;HWANG, S.W.;LEE, C.H.
    • Journal of the Korean Society of Mechanical Technology
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    • v.13 no.1
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    • pp.113-118
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    • 2011
  • To analyze and verify the effect of replacing thermal storage heater by a cascade cycle heat pump using midnight electricity was installed and tested at a customer's house in Wonju, Korea. The electric night storage heater is consist of 30kW electric heater and 2,700 liters of thermal storage water tank to supply hot water for warming house floor. The power for electric heater was cut off and hot water was only generated by cascade cycle heat pump. Current thermal storage water tank was not eliminated and electric heater wiring was modified. Some operation logic of the heat pump was also modified for proper operation. The required capacity of the heat pump and hot water temperature for given warming condition were estimated. The estimated capacity of heat pump was about 19kW and estimated hot water temperature for proper heating was at least $75^{\circ}C$.

Development of Measurement and Performance Testing System for Heat Pump water Heater (히트펌프 온수기 개발을 위한 계측 및 성능평가시스템 구축)

  • Kwon, Seong-Chul;Yang, Seung-Kwon
    • Proceedings of the KIEE Conference
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    • 2004.07d
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    • pp.2310-2312
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    • 2004
  • In Korea Electric Power Corporation (or KEPCO), several Demand-Side Management (or DSM) program have been carried out to effectively meet electric power demand at least costs by modifying customers electricity use patterns. As one of them, KEPCO applies low-priced night thermal-storage power service for heat appliances to facilitate efficient use of power facilities by shifting relatively high daytime demands to night hours to build loads during the off-peak periods. In the market of heat-storage type water-heater, electric water-heater has been mostly used, but it has low energy efficiency and needs high capacity electric equipments. So in order to replace these electric water heaters, 15 HP air-source heat pump water heater is developed in Korea Electric Research Institute (or KEPRI). This paper shows that measurement system for performance testing of heat pump water heater is established and heating capacity and performance is analyzed and measured for out-door environmental change.

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Analysis of heat and fluid flows in an instant water heater according to design parameters of an electric heat device (전기히터의 설계 변수에 따른 순간온수기 열유동 특성 해석)

  • Hui Sun;Joon Hyun Kim;Jaeyong Sung
    • Journal of the Korean Society of Visualization
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    • v.21 no.3
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    • pp.23-32
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    • 2023
  • This study aims to explore the heat transfer and flow phenomena inside an instant water heater and the influence of the design parameters of the water heater on the heating performance was investigated by 3-D numerical simulations considering heat convection. The design parameters are the heating ceramic dimension, the power of the heating device, and the water flow rate. The results show that a reasonable space for the heating device is required to optimize the heating performance. It is desirable to design higher heating device as possible for a given electric power. There exists a critical water flow rate that best meets the heating performance. The change in electric power has no impact on the flow phenomena and heating performance.

Design of Hot-water wit an Electric Instantaneous Water Heating Unit (분리형 전기순간가열기에 의한 온수 비데 설계)

  • 고석조;김창동
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2004.10a
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    • pp.69-72
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    • 2004
  • There are an electronic and a manual type in Bidet. The electronic bidet has some advantages. it supplies multiple functions and is up easily. However, it has frequent defects and a high price. The manual bidet is not need to supply electric and is cheaper than the electronic type. However, it is needed to supply hot water and is hard to set up. In order to solve these defects, this study designed a bidet heating unit using an electric instantaneous water heating method. To get a proper heating elements, experiments were performed about a Ni-Cr heater and a film heater.

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Energy Performance Comparison of Electric Heater and Geothermal Source Heat Pump type Agricultural Hot Air Dryers (전기히터식 및 지열원 히트펌프식 농산물 열풍건조기의 에너지 성능 비교)

  • Yang, Won Suk;Kim, Young Il;Park, Seung Tae
    • Journal of the Korean Society for Geothermal and Hydrothermal Energy
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    • v.14 no.4
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    • pp.7-12
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    • 2018
  • Energy performance of electric heater and geothermal source heat pump type hot air dryers are compared in this study. For set temperatures of $30^{\circ}C$, $35^{\circ}C$ and $40^{\circ}C$, radish is dried from initial mass 60 kg until it gets 5 kg, where the difference equals the amount of water removed. As set temperature is increased, drying time is shortened for both electric heater and heat pump types, however energy efficiency is decreased due to increasing electricity consumption. Moisture extraction rate(MER) of electric heater is 2.58~2.84 kg/h, and for heat pump type 2.56~2.71 kg/h, showing little difference between the two types. Specific moisture extraction rate (SMER) of electric heater is 0.94~0.96 kg/kWh, and for heat pump type 1.72~2.21 kg/kWh. SMER of heat pump type is greater by 0.78~1.25 kg/kWh than the electric heater hot air dryer, which is 1.8~2.3 times better in terms of energy efficiency.

Effect on Household Absorption Chiller by the Supply of the Cooling Water (냉각수 보급이 가정용 흡수식 냉난방기의 성능에 미치는 영향)

  • 이호생;김동휘;최병권;김재돌;윤정인
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • 2002.05a
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    • pp.267-272
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    • 2002
  • The electric heat pump requiring HCFCs as a refrigerant has been for most residential air-conditioners in Korea. They cause a surge up electric power demand during summer. Moreover, the use of HCFCs and HFCs causes a serious problem to the global environment such as global warming and ozone layer destruction. An absorption chiller and heater could solve such problems. It was built and tested for analyzing the performance of the absorption chiller/heater. Experiment was done with a 1.5RT household absorption chiller and heater. It was experimented that the cooling capacity, gas capacity, COP were researched by the temperature of cooling water. The change of the cooling water temperature have effect the temperature(or pressure) of the parts on absorption chiller The result of the change of the cooling water temperature have the effects of the absorption chillers. This data will help to operate the household absorption chiller and heater.

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Studies on Performance of CO2 Water Heater by Numerical Modeling (수치적 모델링을 통한 이산화탄소 급탕기의 특성 연구)

  • Park, Han Vit;Yun, Rin
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.25 no.1
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    • pp.20-27
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    • 2013
  • Numerical modeling of $CO_2$ water heater was conducted prior to optimal design of medium and large sized $CO_2$ water heater, and the experimental test with small sized $CO_2$ water heater having heat capacity of 4 kW was completed to verify the present numerical model. The present model estimated the experimental data of COP(coefficient of performance), heating capacity, and the hot water outlet temperature within the range of 3% to 8% of mean deviation. As increase of EEV(electric expansion valve) opening area, decreasing of heating capacity and the hot water outlet temperature, and increasing of COP were found in both experimental and numerical investigation.

Design and Verification of Ceramic Heating Element-based Tankless Instant Electric Water Heater (세라믹 발열체기반 비저장식 순간 전기 온수기 개발 및 검증)

  • Ahn, Sung-Su;Kim, Woo-Hyun
    • Journal of the Institute of Electronics and Information Engineers
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    • v.53 no.11
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    • pp.151-159
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    • 2016
  • This paper proposes a ceramic heating element-based tankless instant electric water heater for hand/face washing that does not require a lot of hot water. The heating module, which heats the input water and outputs hot water, operates the ceramic heating element detecting input water using a flow sensor. Inside of the heating module is designed to form one flow path in order to get almost $15^{\circ}C$ increased heated water compared to the input water temperature within 2 second after 1.5 liter per minute water supply. The design validity is verified using a heat flow analysis of the water flow and temperature variations inside of the heating module also. Based on the design data, the heating module is constructed including a single rod-type ceramic heating element. After that, a prototype system having temperature setting function by three steps were constructed. The prototype system is connected to a 1.5 liter per minute water supply line, and the water output temperature and time measurement experiments confirmed that the proposed system output the heated water increased by $18.3^{\circ}C$ in case of third step setting within 2 second after water supply. And standby power is under 1 W and peak power does not exceed the permissible range for the general house usage. Several performance results verify that the proposed tankless instant electric water heater is applicable for the washstand of the house, highway rest area and factory so on as winter-time hand/face washing.