Performance analysis of diesel engine heat pump incorporated with heat recovery

Shah, Nikhilkumar; Huang, Ming Jun; Hewitt, N. J.

doi:10.1016/j.applthermaleng.2016.07.123

Cited by 9 publications

(10 citation statements)

References 24 publications

(23 reference statements)

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“…However, the pros and cons including the efficiency improvement and carbon emissions savings comparison is important to provide solid information to the policy makers and homeowners. The HP studies as a domestic retrofit technology could mainly be divided into two categories based on the supply temperature, i.e., (a) low to medium (35)(36)(37)(38)(39)(40)(41)(42)(43)(44)(45) • C) and high supply temperature (55 • C), and (b) very high supply temperature (60 • C and above). The literature on the domestic retrofit applications were mainly based on the predictions/and field trials of the commercially available units, manufacturer data information with no control over supply temperature, assuming nominal value for heat supply temperature [23,24], and without considering the heat supply temperature, control mode, building insulations, climatic conditions simultaneous impact.…”

Section: Literature Reviewmentioning

confidence: 99%

Domestic Retrofit Assessment of the Heat Pump System Considering the Impact of Heat Supply Temperature and Operating Mode of Control—A Case Study

et al. 2021

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In this study, performance assessment of the variable speed compressor-based air source heat pump (ASHP) system as a domestic retrofit technology instead of fossil fuel-based heating technologies for the 1900s Mid terraced house is investigated. The assessment was conducted considering operating mode of control and heat supply temperature impact of the system. In the literature, ASHP system experimental development with variable speed mode (VSM) of control in comparison to fixed speed mode (FSM) of control at low to medium and high heat supply temperature in the context of UK was found with very limited number of studies, but without considering retrofit application. The focus of the earlier studies was on the individual components and performance improvement. The designed heat pump (HP), developed, and tested at constant heat load, simulating the real domestic heat demand under the controlled laboratory conditions and numerical modeling is utilized for the analysis purposes. The HP performance, energy demand, carbon emissions, and cost varies significantly due to changing heat supply temperature (35 °C, 45 °C, and 55 °C), control mode and accordingly the carbon emission and cost savings are achieved. The oil and gas boilers ranges from conventional to highly efficient type and evaluated in terms of annual running cost, energy consumptions, and carbon emissions in comparison with the HP system. Additionally, a comparative study with the existing retrofitted very high temperature ASHP inside the house is conducted. The developed HP at 55 °C could not defeat the very high heat supply temperature HP system (75 °C supply temperature) in performance and cost savings but become attractive at low supply temperature (35 °C). The HP system in VSM at low heat supply temperature instead of gas boiler (90% efficiency) could cut the annual carbon emissions by 59% but with additional 6% running cost for the Mid terraced test house in Belfast climatic conditions.

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Section: Literature Reviewmentioning

confidence: 99%

Domestic Retrofit Assessment of the Heat Pump System Considering the Impact of Heat Supply Temperature and Operating Mode of Control—A Case Study

et al. 2021

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“…Figure 3 shows the dependency of the exhaust gas temperature and water temperature on the engine load, and these parameters increase with applied load because as the load increases, the amount of fuel burning in the engine increases, and exhaust gas temperature increases. The exhaust gas temperature in the heat recovery system decreases from the value of 297°C to 162°C and the heating water average temperature increases from the 55°C to 76°C (Shah, Huang, & Hewitt, 2016).…”

Section: Resultsmentioning

confidence: 99%

“…The average values of the COP for the simple‐HPD with open loop, simple‐HPD with closed‐loop, WHR‐assisted HPD in open, and WHR‐assisted HPD in closed systems were 5.34, 4.25, 5.18, and 3.48, respectively. COP values for closed‐loop are in the literature range; however, COP of open‐loop was a little high as compared to closed‐loop as most of the researchers did the experiment in the closed‐loop (Ismaeel & Yumrutaş, 2020; Shah et al., 2016; Wang et al., 2019).…”

Section: Resultsmentioning

confidence: 99%

Experiment on waste heat recovery‐assisted heat pump drying of food chips: Performance, economic, and exergoeconomic analyses

Singh

Sarkar

Sahoo

2020

J Food Process Preserv

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Novel waste heat recovery‐assisted heat pump dryer is designed, developed, and experimented in different operating modes. Energy, exergy, economic, and exergoeconomic parameters of the dryer with and without waste heat recovery are experimentally compared. Radish chips are dried to remove moisture from 93.5% to 10.5% at fixed dryer inlet air velocity. Both energy and exergy efficiencies are found highest for the waste heat recovery‐assisted (hybrid) system (56.26% and 35.9%, respectively). Specific moisture extraction rate (2.4 kg/kWh) and coefficient of performance (6.72) are highest for the hybrid system. The payback period for the hybrid system over the simple system is 33 months. The lowest exergoeconomic factor is for expansion devices in both simple and hybrid systems (0.0918 and 0.1348, respectively). Total exergy destruction costs for simple and hybrid systems are 0.10148 and 0.1266 $/h, respectively. The most important component that needs to improve based on the exergoeconomic factor is the drying chamber. Practical applications In the present study, a novel heat pump dryer assisted with waste heat recovery from the diesel engine is designed and developed. Various energy, exergy, economic, and exergoeconomic performance parameters with and without waste heat recovery are experimentally compared. To check the applicability, the radish chips have been dried to remove moisture from 93.5% to 10.5% at fixed dryer inlet air velocity. The testing shows that the proposed system is superior as compared to the simple heat pump dryer in terms of both energy and exergy efficiencies, specific moisture extraction rate, and overall heating coefficient of performance. The payback period for the proposed system over a simple one is found 3 years approximately. The proposed system can be a futuristic and promising solution for the drying applications, which satisfies two purposes: An effective way to utilize the engine waste heat and superior system performance.

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“…Accordingly, experimental studies about GEHP have been well treated in the existing publications. Shah et al [36] developed detailed studies about diesel engine driven heat pump, but they did not propose any model. Jiying et al [37] who analysed the effect of renewable biogas as a fuel for GEHP system.…”

Section: Thermal Evaluationmentioning

confidence: 99%

Gas engine heat pump system: Experimental facility and thermal evaluation for 5 different units

Ramos

Delgado

Domínguez

et al. 2019

Energy Conversion and Management

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Performance analysis of diesel engine heat pump incorporated with heat recovery

Cited by 9 publications

References 24 publications

Domestic Retrofit Assessment of the Heat Pump System Considering the Impact of Heat Supply Temperature and Operating Mode of Control—A Case Study

Domestic Retrofit Assessment of the Heat Pump System Considering the Impact of Heat Supply Temperature and Operating Mode of Control—A Case Study

Experiment on waste heat recovery‐assisted heat pump drying of food chips: Performance, economic, and exergoeconomic analyses

Gas engine heat pump system: Experimental facility and thermal evaluation for 5 different units

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