Optimal design and operation of a central domestic hot water heat pump system for a group of dwellings employing low temperature waste heat as a source

Hervas-Blasco, Estefanía; Navarro-Peris, Emilio; Corberán, José M.

doi:10.1016/j.energy.2019.115979

Cited by 17 publications

(6 citation statements)

References 20 publications

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“…Figure 1a presents the general layout of the conventional solution, HP coupled with TES and HRU, with a stratified storage tank, whereas Figure 1b presents the system with the variable-watervolume TES system proposed in [31]. The systems under analysis consists of a HP-DHW production facility with sensible heat storage and a HRU.…”

Section: Cases Analyzedmentioning

confidence: 99%

“…Transient system simulation tool (TRNSYS) [34] has been used to model and analyze the different cases. The model presented in [31] was used for the variable-water-volume case and the stratified model was created using the variable-water-volume model as basis. The features and modeling of the main components of the systems and of the control are commented in the following.…”

Section: Integrated System Modelmentioning

confidence: 99%

“…In [31], a system employing a tank with variable-water-volume was designed and optimized to minimize the energy consumption while satisfying the instantaneous DHW demand of a set of 20 dwellings. The system uses a HP specially adapted for the production of DHW [31], a variable-water-volume storage tank and a heat recovery unit (HRU) in order to maximize the system global efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…In this research, the influence derived from the way in which the water is stored is going to be analyzed for energy recovery applications, considering a water heat source temperature of 30 • C which could correspond to an ULTDH network or waste heat from grey water applications. In order to do that, the stratified tank, which is the most extended solution nowadays, is compared with the variable volume tank proposed in [31]. To this purpose, both cases have been simulated and their energy performance from the point of view of the system has been analyzed.…”

Section: Introductionmentioning

confidence: 99%

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Influence of the Thermal Energy Storage Strategy on the Performance of a Booster Heat Pump for Domestic Hot Water Production System Based on the Use of Low Temperature Heat Source

2020

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Energy recovery from a low temperature heat source using heat pump technology is becoming a popular application. The domestic hot water demand has the characteristic of being very irregular along the day, with periods in which the demand is very intensive and long periods in which it is quite small. In order to use heat pumps for this kind of applications efficiently, the proper sizing and design of the water storage tank is critical. In this work, the optimal sizing of the two possible tank alternatives, closed stratified tank and variable-water-volume tank, is presented, and their respective performance compared, for domestic hot water production based on low temperature energy recovery in two potential applications (grey water and ultra-low temperature district heating). The results show that the efficiency of these kind of systems is very high and that variable-water-volume tanks allow a better use of the energy source, with an 8% higher exergy efficiency and around 3% better seasonal performance factor (SPF), being able to provide similar comfort levels with a smaller system size.

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Section: Cases Analyzedmentioning

confidence: 99%

Section: Integrated System Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of the Thermal Energy Storage Strategy on the Performance of a Booster Heat Pump for Domestic Hot Water Production System Based on the Use of Low Temperature Heat Source

2020

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“…Kunal et al have investigated the utilization of waste heat of ICE for thermoelectric power generation [30,31]. Estefania et al have developed the energy recovery-based heat pump system which uses low grade temperature source for domestic hot water supply [32]. Ahmadi et al have proposed solar thermal energy based parallel feed water heating system for power plant units.…”

Section: Introductionmentioning

confidence: 99%

Energy Saving and Economic Evaluations of Exhaust Waste Heat Recovery Hot Water Supply System for Resort

et al. 2021

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The objective of this study is to investigate the energy savings and economics of the hot water supply system for the luxury resort. The hot water was generated using the waste heat from the exhaust gas heat (EGH) of internal combustion engine (ICE) installed at the luxury resort. The capacity and characteristics of waste heat source, flow demand and supply system of hot water were surveyed, and data is collected from the real system. The new heat exchanger system which utilizes the EGH to produce the hot water is designed considering the dew point temperature and the back pressure of exhaust gas system. The results show that the proposed system could supply hot water at a temperature of 55 °C corresponding to the present resort demand of 6 m3/h using EGH of ICE at 20% load. The proposed system could achieve the saving of 400 L/day in diesel oil (DO) fuel consumption and the payback time of new system could be evaluated as 9 months. The proposed system could produce hot water of 14 m3/h at 25% of engine load and 29 m3/h at full engine load which are sufficient to satisfy the regular and maximum hot water demand of resort. The presented results show the capability of the proposed system to satisfy the current hot water demand of resort and suggest the larger potential to save energy by recovering EGH of ICE. The novelty of the present work involves detailed methodology to design heat exchangers and evaluate system economics for hot water supply system based on EGH of ICE.

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Design of an economically sustainable energy recovery system for domestic instant geyser

Ali,

Zia-ur Rahman,

Hussain

et al. 2024

J Therm Anal Calorim

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Optimal design and operation of a central domestic hot water heat pump system for a group of dwellings employing low temperature waste heat as a source

Cited by 17 publications

References 20 publications

Influence of the Thermal Energy Storage Strategy on the Performance of a Booster Heat Pump for Domestic Hot Water Production System Based on the Use of Low Temperature Heat Source

Influence of the Thermal Energy Storage Strategy on the Performance of a Booster Heat Pump for Domestic Hot Water Production System Based on the Use of Low Temperature Heat Source

Energy Saving and Economic Evaluations of Exhaust Waste Heat Recovery Hot Water Supply System for Resort

Design of an economically sustainable energy recovery system for domestic instant geyser

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