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| 1 | Research trend of cascade heat pumps显示文摘Most commercial and industrial facilities require very low temperatures for refrigeration and high temperatures for space heating and hot water purposes. Single stage heat pumps have not been able to meet these temperature demands and have been characterized by low capacities and coefficient of performance(COP). Cascade heat pump has been developed to overcome the weaknesses of single stage heat pumps. This study reviews recent works done by researchers on cascade heat pumps for refrigeration, heating and hot water generation. Selection of suitable refrigerants to meet the pressure and temperature demands of each stage of the cascade heat pump has been discussed. Optimization of design parameters such as intermediate temperature(low stage condensing and high stage evaporating temperatures), and temperature difference in the cascade heat exchanger for optimum performance of the cascade heat pump has been reviewed. It was found that optimising each design parameter of the cascade heat pump is necessary for maximum system performance and this may improve the exergetic efficiency, especially of cascade refrigeration systems, by about 30.88%. Cascade heat pumps have wider range of application especially for artificial snow production, in the supermarkets,for natural gas liquefaction, in drying clothes and food and as heat recovery system. The performance of cascade heat pumps can be improved by 19% when coupled with other renewable energy sources for various real time applications. Also, there is the need for much research on refrigerant charge amount of cascade heat pumps, refrigerant-refrigerant heat exchangers to be used as cascade heat exchanger, cascade heat pumps for simultaneous cooling, heating and hot water generation and on the use of variable speed compressors and their control strategies in matching system capacity especially at part load conditions. | BOAHEN Samuel CHOI JongMin | 2017 | Science China(Technological Sciences)2017，60，11： | 5 |
| 2 | Hydrotreating of co- ker light gas oil on SBA - 15 supported nickel phosphide cata- lysts 显示文摘 | Soni K K Boahene P E Rambabu N | 2013 | Catalysis Today2013，，207： | 1 |
| 3 | Hydrotreating of coker light gas oil on MCM -41 supported nickel phosphide catalysts显示文摘 | Soni K K Boahene P E Dalai A K | 2012 | ACS Symposium Series2012，1088，： | 1 |
| 4 | Mucoepidermoid Carcinoma of the Parotid Gland:The Mayo Clinic Experience显示文摘 | Derek Kofi O Boahene Kerry D | 2004 | Arch Otolaryngol Head NeckSurg2004，130，： | 1 |
| 5 | Temporalis tendon transfer as part of a comprehensive approach to facial reanima- tion 显示文摘 | Byrne PJ Kim M Boahene K | 2007 | Arch Facial Plast Surg2007，9，4： | 1 |
| 6 | Termination of acute atrial fibrillation in the Wolff-Parkinson-White syndrome by procainamide and propafenone: importance of atrial fibrillatory cycle length显示文摘 | Boahene KA Klein G J Yee R | 1990 | J Am Coll Cardiol1990，16，6： | 1 |
| 7 | Alar rim grafting in rhinoplasty:indications,technique,and outcomes显示文摘 | Boahene KD Hilger PA | | 0，，05： | 1 |
| 8 | Mucoepidermoid Carcinoma of the Parotid Gland:The Mayo Clinic Experience显示文摘 | Derek Kofi O Boahene Kerry D | 2004 | Arch Otolaryngol Head Neck Surg2004，130，： | 1 |
| 9 | Rationality and Decision-Making of Small Farmers:The Case of Ghana显示文摘 | Kwasi Boahene | 1996 | Journal of Interdisci- plinary Economics1996，，2： | 1 |
| 10 | Silicon-Neuron Design : A Dynamical Systems Approach 显示文摘 | John VA Boahen K | 2010 | IEEE Transactions on Circuits and Systems I: Regular Papers2010，18，： | 1 |
| 11 | A novel step in the anterolateral thigh free flap harvest 显示文摘 | Boahene K Richmon J Sultan B | 2010 | Otolaryngol Head Neck Surg2010，142，： | 1 |
| 12 | Facial reanimation after acoustic neuroma resection:options and timing of intervention显示文摘 | Boahene K | 2015 | Facial Plast Surg2015，31，2： | 1 |
| 13 | Analysis of indoor set-point temperature of split-type ACs on thermal comfort and energy savings for office buildings in hot-humid climates显示文摘In hot-humid climates,particularly in sub-Saharan Africa(SSA),ambient temperatures and relative humidity are as high as 35°C and 84%,respectively,requiring the use of mechanical cooling systems for indoor thermal comfort.Split-type vapor-compression air-conditioners(SVAC)are mainly used for space cooling in SSA and consume 60-80%of total energy consumption in commercial and public buildings.Appropriate control strategy of the indoor set-point temperature of SVAC can result in significant energy savings in these buildings.In this study,modeling and dynamic simulation have been conducted using EnergyPlus to predict the energy saving potential and indoor thermal comfort of buildings in hot-humid climates by controlling set-point temperature of the SVAC.In a case study,climatic data for Ghana,was used to predict the energy saving potential and indoor thermal comfort.The study results revealed that,to ensure indoor thermal comfort at high outdoor temperature condition of 35°C,the least and optimum set-point temperatures of the SVAC should be 21°C and 25°C,respectively.On the other hand,for low outdoor temperature condition,the least and optimum set-point temperatures were 22°C and 26°C,respectively.Considering 1-star and 2-star rated SVACs which are dominantly used in Ghana,operating at 21-25°C in the case of high outdoor conditions,and 22-26°C for low outdoor conditions relative to the least temperatures resulted in energy savings of 8-33%and 12-44%,respectively. | KofiOwura Amoabeng Richard Opoku Samuel Boahen George Yaw Obeng | 2023 | Energy and Built Environment2023，4，3： | 1 |
| 14 | Use of customized polyetheretherketone (PEEK) implants in the reconstruc- tion of complex maxillofacial defects 显示文摘 | Kim MM Boahene KD Byrne PJ | 2009 | Arch Facial Plast Surg2009，11，1： | 1 |
| 15 | Traumatic facial nerve neuroma with facial palsypresenting in infancy 显示文摘 | CLARK JH BURGER PC BOAHENE DK | 2010 | Otol Neurotol2010，31，5： | 1 |
| 16 | Optical nerve signals in a neuromorphic chip: Outer and inner retina model显示文摘 | K A Zaghloul K Boahen | 2004 | IEEE Trans Biomed Eng2004，51，4： | 1 |
| 17 | Traumatic facial nerve neuroma with facial palsy presenting in infancy显示文摘 | CLARK J H BURGER P C BOAHENE D K | 2010 | Otol Neurotol2010，31，： | 1 |
| 18 | Traumatic facial nerve injury显示文摘 | Lee LN Lyford-Pike S Boahene KD | 2013 | Otolaryngol Clin North Am2013，46，5： | 1 |
| 19 | Traumatic facial nerveinjury 显示文摘 | Lee LN Lyford-Pike S Boahene KD | 2013 | Otolaryngol Clin N Am2013，46，5： | 1 |
| 20 | Neurotech for neuroscience: unifying concepts, organizing principles, and emerging tools 显示文摘 | SILVER R BOAHEN K GRILLNER S | 2007 | The Journal of Neuroscience2007，27，11： | 1 |
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