Performance analysis of a solar-assisted heat pump water heater

Chyng, J.P.; Lee, C.P.; Huang, Bin‐Juine

doi:10.1016/s0038-092x(03)00110-5

Cited by 108 publications

(43 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Therefore, SWH systems can meet the temperature requirements except, perhaps, in extreme weather conditions. The latest SWH product technologies (with advanced heat pump and heat pipes) can produce water at a temperature above 60 1C under all weather conditions (Chyng et al, 2003;Wang et al, 2000). However, there remain two major technical concerns with SWH in China.…”

Section: Technology Performancementioning

confidence: 99%

Solar water heaters in China: A new day dawning

2010

View full text Add to dashboard Cite

a b s t r a c t Solar thermal utilization, especially the application of solar water heater technology, has developed rapidly in China in recent decades. Manufacturing and marketing developments have been especially strong in provinces such as Zhejiang, Shandong and Jiangsu. This paper takes Zhejiang, a relatively affluent province, as a case study area to assess the performance of solar water heater utilization in China. The study will focus on institutional setting, economic and technological performance, energy performance, and environmental and social impact. Results show that China has greatly increased solar water heater utilization, which has brought China great economic, environmental and social benefits. However, China is confronted with malfeasant market competition, technical flaws in solar water heater products and social conflict concerning solar water heater installation. For further development of the solar water heater, China should clarify the compulsory installation policy and include solar water heaters into the current ''Home Appliances Going to the Countryside'' project; most of the widely used vacuum tube products should be replaced by flat plate products, and the technology improvement should focus on anti-freezing and water saving; the resources of solar water heater market should be consolidated and most of the OEM manufacturers should evolve to ODM and OBM enterprises.

show abstract

Section: Technology Performancementioning

confidence: 99%

Solar water heaters in China: A new day dawning

2010

View full text Add to dashboard Cite

show abstract

“…The main reason for this apparent discrepancy is due to the kind of investigation made in this study, which refers to the tuning and test of the system when external gas burner device is used for thermal aid, rather than using an electric boosted one [28] or a standalone system [30]. It seems reasonable that in a different operative context optimal performance is achieved by means of different working set points.…”

Section: Resultsmentioning

confidence: 93%

Integrated solar-assisted heat pumps for water heating coupled to gas burners; control criteria for dynamic operation

Scarpa¹,

Tagliafico²,

Tagliafico³

2011

Applied Thermal Engineering

View full text Add to dashboard Cite

A direct expansion integrated solar assisted heat pump (ISAHP) is compared to a traditional flat plate solar panel for low temperature (45 °C) water heating applications. The (simulated) comparison is accomplished assuming both the devices are energy supplemented with an auxiliary standard gas burner, to provide the typical heat duty of a four-member family. Literature dynamical models of the systems involved have been used to calculate the main performance figures in a context of actual climatic conditions and typical stochastic user demand.The paper highlights new heat pump control concepts, needed when maximum energy savings are the main goal of the apparatus for given user demand. Simulations confirm the high collector efficiency of the ISAHP when its panel/evaporator works at temperature close to the ambient one. The device, with respect to a flat plate solar water heater, shows a doubled performance, so that it can do the same task just using an unglazed panel with roughly half of the surface.

show abstract

“…Following his work, several studies have been conducted, such as the ones by Mehdaoui [21], Bridgeman [22], DeGrove [23], Khalaf [24], Fu [25], Kamel [26] and Youssef [27]. Alternatively, several authors developed and proposed mathematical models of the system employing a more robust approach where every process of the heat pump cycle was modelled separately and then connected to simulate and quantify the performance of the HP in terms of COP and collector efficiency such as Sterling et al [28], Li et al [29], Çaglar et al [30], Kokila et al [31] and Gorozabel-Chata et al [32], in terms of exergy destruction and second law of thermodynamics, by Atmaca et al [33] and Torres-Reyes et al [34] respectively, and based on worktime and flow resistance in the collectors such as the one proposed by Chyng et al [35]. One particular study is the one published by Chow et al [36] where they set out a comprehensive model centered on the effect the atmospheric conditions have on the yearly performance of the heat pump, employing a 25 years period database of the typical meteorological months.…”

Section: Dxsahp Modelling and Simulationsmentioning

confidence: 99%

Mathematical Thermal Modelling of a Direct-Expansion Solar-Assisted Heat Pump Using Multi-Objective Optimization Based on the Energy Demand

León-Ruiz

Carvajal-Mariscal

2018

Energies

View full text Add to dashboard Cite

An analytical model is proposed to evaluate the performance of a Direct Expansion Solar-Assisted Heat Pump under a given environmental condition. These thermal machines commonly employ uncovered flat plate solar collectors, and given this, the convection phenomenon is taken into account as well as the effect of the diffuse and reflected solar radiation in addition to the normal beam radiation absorbed by the tilted surface of the collectors. The heat pump cycle is modelled through a first law of thermodynamics approach in order to compute the heat yielded through condensation and the minimum heat required by the volume of water in the thermal storage unit. Consequently, the thermal capacity of the heat pump, the ratio at which the system yields heat to a given load of water, is calculated and discussed. The results of the model proposed are compared with the experimental data provided by three research papers with experiments conducted in different geographic coordinates and test rigs operating during diverse atmospheric conditions. A maximum relative error of 20% was obtained and furthermore, a statistical analysis of the data was conducted having found that there is no significant statistical difference between the analytical and experimental data samples within the 95% confidence interval. Finally, based on the thermal capacity, the performance of the heat pump is evaluated and a multi-objective optimization technique is implemented to obtain the best possible combination of factors to further enhance the performance of the heat pump.

show abstract

Performance analysis of a solar-assisted heat pump water heater

Cited by 108 publications

References 5 publications

Solar water heaters in China: A new day dawning

Solar water heaters in China: A new day dawning

Integrated solar-assisted heat pumps for water heating coupled to gas burners; control criteria for dynamic operation

Mathematical Thermal Modelling of a Direct-Expansion Solar-Assisted Heat Pump Using Multi-Objective Optimization Based on the Energy Demand

Contact Info

Product

Resources

About