• Title/Summary/Keyword: Heat source

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A Study on Comparative Analysis of Energy Performance of Hybrid Heat Pump Systems Using Ground Heat Source and Water Heat Source (지열원과 수열원을 이용한 하이브리드 히트펌프 시스템의 에너지 성능 비교 분석 연구)

  • Park, Sihun;Kim, Jonghyun;Min, Joonki
    • Journal of the Korean Society for Geothermal and Hydrothermal Energy
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    • v.17 no.4
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    • pp.59-67
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    • 2021
  • In this study, the performance of the single heat source system and the hybrid system was comparatively analyzed. Case 1 is a ground heat source system, and Case 2 is a water heat source system. Case 3, a hybrid system, reduced the capacity of the ground heat source and applied a water heat source as an auxiliary heat source, and Case 4 was composed of a system that applied a water heat source as an auxiliary heat source to the ground heat source system. As a result of the simulation, in case 3, energy consumption was reduced by up to 2.67% compared to ground sources for cooling. In Case 4, COP was improved by up to 10.02% compared to ground sources during cooling, and EST was calculated to be 2.42℃ lower. During heating, 0.83% was improved compared to the water heat source. At this time, the EST was calculated to be 2.25℃ higher than the water heat source.

A Study on the Performance Evaluation of Combined Heat Pump System according to the Ratio of Ground Heat Source and Water Heat Source (지열원 및 수열원 비율에 따른 복합열원 히트펌프시스템 성능 평가 연구)

  • Park, Sihun;Ko, Yujin;Min, Joonki
    • Journal of the Korean Society for Geothermal and Hydrothermal Energy
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    • v.17 no.2
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    • pp.11-19
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    • 2021
  • In this study, combined heat source heat pump system was implemented with 4 single heat source heat pumps each applied with a geothermal source and a water source. Five cases (Case1~Case5) were configured to conduct a performance comparison and analysis of the combined heat source heat pump system. First of all, as a result of analyzing the heat source, the case when 4 ground heat sources were applied (Case1) showed a uniform EST(Entering Source Temperature) distribution throughout the year since it is less affected by outside air compared to the case when 4 water heat sources were applied (Case5). In both winter and summer, the ground heat source maintained higher EST than the water heat source. Therefore, the system with high ratio of geothermal sources is advantageous for heating, and with high ratio of water heat sources is advantageous for cooling.

Study on Energy Consumption of Air-source, Ground-source and Dual-source Heat Pump during Intermediate Season (공기, 지열 및 복합 열원 열펌프의 중간기 에너지 소비량에 관한 연구)

  • Cho, Yeong Uk;Woo, Tea Ho;Chung, Kwang-Seop;Kim, Youngil
    • Journal of the Korean Society for Geothermal and Hydrothermal Energy
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    • v.9 no.4
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    • pp.1-7
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    • 2013
  • This study is to compare energy consumption of air-source, ground-source and dual-source heat pump systems during intermediate season using dynamic simulation. Ground-source heat pump has higher COP than that of air-source but requires additional power consumption of auxiliary equipment such as circulation pump. During intermediate season when the outdoor air temperature is favorable, total COP of air-source heat pump may be greater than that of ground-source when circulation pump power consumption is included. Dual-source heat pump which selects the more favorable heat source is compared with air-source only and ground-source only heat pumps for total power consumption. Results show that power consumption of dual-source heat pump is lower than that of ground-source only by 0.73%.

A Study on the Monitoring Methods for Energy Production in Ground Source Heat Pump System (지열원 열펌프 시스템의 에너지 생산량 모니터링 신뢰도 향상 방안 연구)

  • Kang, Shin-Hyung;Lee, Kwang Ho;Do, Sung Lok;Choi, Jong Min
    • Journal of the Korean Society for Geothermal and Hydrothermal Energy
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    • v.15 no.2
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    • pp.10-16
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    • 2019
  • In this study, the present regulation of heat metering for the ground source heat pump was investigated. The ground source heat pump has been adopting the heat metering system used in the district heating system for estimating the heating and cooling energy production amount. The accuracy of the present heat metering systems for a water to water ground source heat pump is low, because the system for district heating has a relatively high temperature range comparing with the ground source heat pump operating conditions. Even though the heat amount for the building side should be measured, the heat absorption and extraction amount from or to the ground was measured for the water to air ground source heat pump due to the difficulty of estimating the air side heating and cooling capacity in the present regulation. It is highly recommended to validate the heat metering system to have reliability for the ground source heat pump and develop the system to be applicable water to air ground source heat pump.

Cooling and Heating Operation Characteristics of Raw-water Source Heat Pump and Air Source Heat Pump in Water Treatment Facility (정수장 내 원수열원 및 공기열원 히트펌프의 냉난방 운전 특성)

  • Oh, Sun-Hee;Yun, Rin;Cho, Yong
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.25 no.7
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    • pp.386-391
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    • 2013
  • The dynamic characteristics of both raw-water source and air source heat pump utilized in water treatment facilities were investigated by using TRNSYS simulator. The modeling of the raw water source heat pump was verified by the measured data at the Cheongju water treatment facility, and the modeling at the air source heat pump was verified by the data from the Siheung water treatment facility. The average heating and cooling COPs from the raw-water source heat pump were higher than those of the air source heat pump by 19% and 18%, respectively. The power consumptions of the air source heat pump for the cooling and the heating were higher than those of the raw water source heat pump by 28% and 26%, respectively.

Heat source control intelligent system for heat treatment process

  • Lee, JeongHoon;Cho, InHee
    • International journal of advanced smart convergence
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    • v.11 no.4
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    • pp.28-40
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    • 2022
  • Although precise temperature control in the heat treatment process is a key factor in process reliability, there are many cases where there is no separate heat source control optimization system in the field. To solve this problem, the program monitors the temperature data according to the heat source change through sensor communication in a recursive method based on multiple variables that affect the process, and the target heat source value and the actual heat treatment heat source to match the internal air temperature and material temperature. A control optimization system was constructed. Through this study, the error rate between the target temperature and the atmosphere (material surface) temperature of around 10.7% with the existing heat source control method was improved to an improved result of around 0.1% using a process optimization algorithm and system.

Performance analysis of dual source heat pump system with single unit dual source evaporator (SUDS증발기를 사용한 2중열원 열펌프의 성능해석)

  • 우정선;이세균;이재효;박효순
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.11 no.3
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    • pp.391-400
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    • 1999
  • The efficiency and capacity of an air source heat pump system decrease as the ambient temperature drops. One strategy of avoiding the decrease of the efficiency and capacity in air source heat pump system is to switch to another thermal energy source. Water can be a good candidate for the heat source. This paper presents the results of the performance analysis of heat pump system with a single unit dual source(SUDS) evaporator The heat exchanger combines two separated evaporators into a single evaporator and the object of the SUDS evaporator is to recover energy from dual heat sources, i.e. air and water. Simulation program is developed for the dual source heat pump system with a SUDS evaporator and experimental data are obtained and compared with the simulation results. Differences in heating capacity and COP are 7% and 8% respectively. Simulation results are in good agreement with the test results. Therefore, the developed program is effectively used for the design and performance prediction of the dual source heat pump system with a SUDS evaporator.

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Study on COP Variations with the duration of Ground Source Heat Pump Systems Operation (지열히트펌프의 작동시간 경과에 따른 COP 변화에 대한 연구)

  • Lee, Yonggyu;Baek, Namchoon;Yoon, Eungsang
    • 한국신재생에너지학회:학술대회논문집
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    • 2010.06a
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    • pp.198.2-198.2
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    • 2010
  • In this study, the COP variation with the duration of Ground Source Heat Pump (GSHP) systems operation was analyzed by experiment. This experimental facility was installed in residential house as a back-up device of solar thermal heating system. The capacity of heat pump is 2.5 kW with a vertical bore hole of 150m depth. The COP of GSHP is varied, depending on the ground temperature which is used as a heat source. The ground heat source temperature influencing heating COP is the soil or rock temperature which adjoin with geo-source heat exchanger. This temperature is decreased rapidly according to the operation duration of heat pump. As a result, COP of GSHP is decreased to 3 in one hour of continuous operation time.

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Analytical Study on the Performance of Ground Source Compound Hybrid Heat Pump System for Large Community Building (대형 Community 건물의 지열원 복합 하이브리드 히트펌프 시스템 성능에 관한 해석적 연구)

  • Byun, Jae-Ki;Jeong, Dong-Hwa;Lee, Jong-Gil;Hong, Seong-Ho;Choi, Young-Don;Cho, Sung-Hwan
    • 한국신재생에너지학회:학술대회논문집
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    • 2008.05a
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    • pp.634-637
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    • 2008
  • Ground source heat pumps are clean, energy-efficient and environment-friendly systems cooling and heating. Although the initial cost of ground source heat pump system is higher than that of air source heat pump, it is now widely accepted as an economical system since the installation cost can be returned within an short period of time due to its high efficiency. In the present study, performances of ground source compound hybrid heat pump system applied to a large community building are simulated. The system design and operation process appropriate for the surrounding circumstance guarantee the high benefit of the heat pump system applied to a large community building. If among several renewable energy sources, ground, river, sea, waste water source are chosen as available alternative energies are combined, COP of the system can be increased largely and hybrid heat pump system can reduced the fuel cost.

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Natural Convection in a Rectangular Enclosure with Heat Sources at the Bottom (밑면에 열원이 존재하는 밀폐공간에서의 자연대류)

  • Kwon, Y.I.;Kim, S.J.;Kwon, S.S.
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.3 no.3
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    • pp.197-205
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    • 1991
  • A numerical study has been performed to investigate two dimensional natural convection heat transfer in a rectangular enclosure with heat sources of constant temperature at the bottom. Calculations were made for various dimensionless heat source lengths, W/L=0.1-0.5, and positions of heat sources at $Gr=2.57{\times}10^6$, Pr=0.71 and Ks/Kf=28.98. For various positions of heat sources, the maximum local Nusselt numbers generally show X=0.81-0.85 at the bottom and X=0.23 at the top. For various dimensionless heat source lengths, the maximum local Nusselt numbers at the bottom show W/L=0.4 for one heat source, W/L=0.2 for two heat sources with fixed centers, W/L=0.5 for two heat sources with moved centers. Finally the maximum heat transfer at the bottom exhibits in condition of W/L=0.4 for two heat sources with moved centers.

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