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A novel defrosting method using heat energy dissipated by the compressor of an air source heat pump

Long, Zhang; Jiankai, Dong; Yiqiang, Jiang; Yang, Yao - In: Applied Energy 133 (2014) C, pp. 101-111

, periodic defrosting of the outdoor coil is necessary. Currently, the reverse-cycle defrosting (RCD) method is widely used for … the defrosting of ASHP. However, this operation interrupts space heating during the defrosting process. A time lag occurs … to resume heating at end of the defrosting cycle. Moreover, frequent reversing of the 4-way valve may cause mass leakage …

Persistent link: https://www.econbiz.de/10011041471

An experimental study on the negative effects of downwards flow of the melted frost over a multi-circuit outdoor coil in an air source heat pump during reverse cycle defrosting

Song, Mengjie; Pan, Dongmei; Li, Ning; Deng, Shiming - In: Applied Energy 138 (2015) C, pp. 598-604

point of water and the air dew point, frost can be formed and accumulated over outdoor coil surface. Frosting affects the … energy efficiency, and periodic defrosting therefore is necessary. Reverse cycle defrosting is currently the most widely used … defrosting method. A previous related study has indicated that during reverse cycle defrosting, downwards flow of the melted …

Persistent link: https://www.econbiz.de/10011116053

The Evaluation of Engineering Properties of Low Cost Concrete Blocks by Partial Doping of Sand with Sawdust: Low Cost Sawdust Concrete Block

Fernando, Pius Rodney; Hamigah, T.; Disne, S.; … - In: International Journal of Strategic Engineering (IJoSE) 1 (2018) 2, pp. 26-42

The main objective of the article is to reduce the quantity of sand with the natural agro waste materials and the performance of sawdust-sand-cement stabilized using sawdust (SD) and cement which investigates the water retention (WR), compressive quality (CQ) and flexural quality (FQ) of the...

Persistent link: https://www.econbiz.de/10012048817

The water retention index : using land use planning to manage water resources in Europe

Vandecasteele, Ine; Marí i Rivero, Inés; Baranzelli, … - In: Sustainable development 26 (2018) 2, pp. 122-131

Persistent link: https://www.econbiz.de/10011973680

Experimental investigation of frost and defrost performance of microchannel heat exchangers for heat pump systems

Xu, Bo; Han, Qing; Chen, Jiangping; Li, Feng; Wang, Nianjie - In: Applied Energy 103 (2013) C, pp. 180-188

The cycle frosting and defrosting performance of two types of microchannel heat exchangers were investigated. All the … fin space was completely blocked. The amount of water retained and its impact on frosting time, pressure drop, and … capacity were investigated. With increasing water retention, frosting time decreased, air pressure-drop and capacity could not …

Persistent link: https://www.econbiz.de/10010602992

Research on frost formation in air source heat pump at cold-moist conditions in central-south China

Gong, Guangcai; Tang, Jinchen; Lv, Dongyan; Wang, Hongjin - In: Applied Energy 102 (2013) C, pp. 571-581

wet air, is presented to analyze the performance of ASHP under frosting. The performance parameters, such as the heating … defrosting time interval to improve the ASHP’s energy efficiency and operational reliability at cold-moist conditions in central …

Persistent link: https://www.econbiz.de/10010603013

Experimental study of an air-source heat pump for simultaneous heating and cooling – Part 2: Dynamic behaviour and two-phase thermosiphon defrosting technique

Byrne, Paul; Miriel, Jacques; Lenat, Yves - In: Applied Energy 88 (2011) 9, pp. 3072-3078

cold source at the water evaporator to improve the average performance and to carry out defrosting of the air evaporator … using a two-phase thermosiphon. Unlike conventional air-source heat pumps, defrosting is carried out without stopping the … between heating, cooling and simultaneous modes and the defrosting sequence are analysed and validated experimentally. …

Persistent link: https://www.econbiz.de/10010576278

Utilization and performance evaluation of a surplus air heat pump system for greenhouse cooling and heating

Yang, Seung-Hwan; Rhee, Joong Yong - In: Applied Energy 105 (2013) C, pp. 244-251

Energy conserving is an important issue in greenhouse farming. Because greenhouse operations consume large amount of fossil fuel energy, energy conservation is necessary for securing famers’ income and alleviating global warming. Surplus air thermal energy (SATE) in greenhouses exists even in...

Persistent link: https://www.econbiz.de/10010635994

Probabilistic modeling and assessment of the impact of electric heat pumps on low voltage distribution networks

Navarro-Espinosa, Alejandro; Mancarella, Pierluigi - In: Applied Energy 127 (2014) C, pp. 249-266

Electrification of heating by making use of the Electric Heat Pump (EHP) technology powered by increasing shares of electricity renewable sources is seen as a potential key approach to decarbonise the energy sector in many countries, and especially in the UK. However, the widespread use of EHPs...

Persistent link: https://www.econbiz.de/10010776604

A study of the reverse cycle defrosting performance on a multi-circuit outdoor coil unit in an air source heat pump – Part II: Modeling analysis

Qu, Minglu; Pan, Dongmei; Xia, Liang; Deng, Shiming; … - In: Applied Energy 91 (2012) 1, pp. 274-280

The experimental part of the study of the reverse cycle defrosting performance on a four-circuit outdoor coil unit in … negative effects on defrosting performance. In order to quantitatively analyze the effects, this paper, the second part of the … two-part series, reports on a modeling analysis where a semi-empirical model of the airside defrosting in the four …

Persistent link: https://www.econbiz.de/10010576276