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frosting of air energy storage tube
The effect of PM2.5 air pollution on the frosting process of outdoor finned-tube
1. Introduction As an environmentally friendly and reliable technology, air-source heat pumps (ASHPs) have been used widely for space heating in winter over the world [1], but the challenge of frosting commonly exists for the outdoor coil of ASHP units especially in the ambient environment of low temperature and high humidity.. Frost would
Experimental study of air source heat pump water heater: Energy,
Measuring Instruments Test parameters Quantity Type Accuracy Thermocouple Refrigerant tube wall temperature 12 Ni-Si,Ni-Cr ±0.2 Inspection recorder 1 JK4000–64 ≤0.2 % Multi-parameter ventilation meter Evaporator inlet air temperature, humidity, flow rate. 1
An experimental study on the frosting characteristic and
The frosting performance of the outdoor heat exchanger in an EV heat pump air-conditioning system was investigated experimentally, considering different flow
Techno-economic analysis on frosting and defrosting operations of an air
Thermal energy storage 1. Introduction Air source heat pump (ASHP) units have found applications worldwide in recent decades due to their advantages of high efficiency, environmental protection, low cost and easily modification, etc.
Energy and Buildings | Space heating air source heat pumps (ASHPs): frosting and defrosting
ASHP units have been regarded as one of renewable energy technologies, with a very higher energy efficiency and low initial investment. However, when an ASHP unit is used for space heating, frosting on its outdoor coil surface is common leadiing to a reduced
Improving reverse cycle defrosting performance of air source heat
To solve the fundamental problem of insufficient heat available during defrosting while ensuring the efficient and safe system operation, a novel reverse cycle
Experimental study on the effects of melted frost icing on the operating performances of air
To fulfill this promise, using renewable energy and reducing energy consumption have become the focus of researchers, of which space heating energy consumption can not be ignored [2]. According to the China Building Energy Consumption Research Report (2021) [3], the space heating energy consumption in northern China
A semi-experimental method for evaluating frosting performance of air source heat pumps
Ye et al. [28] studied the correlation between air velocity and frosting rate, and verified the existence of a critical air velocity that maximized the mass transfer in frosting process. Zhang et al. [ 29, 30 ] investigated the deposition of frosting on the surface of FTHXs, and reported that the amount of frost deposited on the edge of the
Performance of finned tube heat exchangers operating under frosting conditions
According to the references, the anti-frosting technologies include changing the characteristics (temperature, velocity [20], humidity [21], pressure [22] and purified air [23]) of inlet ambient
Operating performance of novel reverse-cycle defrosting method based on thermal energy storage for air
J. Cent. South Univ. Technol. (2011) 18: 2163−2169 DOI: 10.1007/s11771−011−0958−1 Operating performance of novel reverse-cycle defrosting method based on thermal energy storage for air source heat pump DONG Jian-kai(), JIANG Yi-qiang(
Experimental study of the characteristic of frosting on low-temperature air
DOI: 10.1016/J.EXPTHERMFLUSCI.2014.02.021 Corpus ID: 121241275 Experimental study of the characteristic of frosting on low-temperature air cooler @article{Haijie2014ExperimentalSO, title={Experimental study of the characteristic of frosting on low
An experimental study on energy-storage based defrosting
Since the studies on defrosting performances of air source heat pump systems with micro-channel heat exchangers as outdoor coils were insufficient,
Experimental and numerical investigation on frosting of finned-tube
Serious frosting often occurs when humid air passes through a finned-tube heat exchanger in a low-temperature, high-humidity environment. The frost layer decreases heat transfer and increases airflow resistance, resulting in lower evaporation and condensing temperatures, heat reduction, and increased energy consumption [1], [2].
An experimental study of frost distribution and growth on finned
The model calculations demonstrated that, by homogenizing the uneven frosting, the maximal air temperature causing frosting would reduce about 2.5 C, and
Experimental study on the effects of melted frost icing on the
A control strategy for residual melted frost icing was proposed. • Icing could accelerate the frost formation on outdoor coil surface. • Icing caused the tube outdoor
Research on the Frosting Rule and Frost Suppression Strategy of Air
And due to the short operating time of the heat storage device at this temperature, the defrosting energy consumption of the heat storage heat pump system is not significantly reduced. With the
Improving the frosting and defrosting performance of air source
Due to a scarcity of reviews of the literature on improving the frosting and defrosting performance of ASHP units, this paper provides a comprehensive review of experimental
Research on anti-frosting potential of air source heat pump
Thermal energy storage based (TES-based) reverse cycle defrosting method is a feasible way to reduce energy requirements for defrosting of cascade air source heat pumps (CASHPs).
An experimental study on frosting and defrosting performances of
The frosting and defrosting performances of the novel system were experimentally investigated, and the results showed that the average values of radiant
An experimental study on frosting and defrosting performances of a novel air
C, and 2.78, respectively, during a 66-min frosting period (air temperature is 2.0 C and relative humidity 84.0%). Some researchers applied thermal energy storage (TES) technology to ASHP units to supply sufficient energy for the defrosting [[28 Qu
Improving defrosting performance of cascade air source heat pump using thermal energy storage based reverse cycle defrosting method
During the heating/frosting operation, the air temperature and RH inside the heated indoor space were maintained at 22 C ± 0.1 C (dry-bulb) and 50% ± 3% relative humidity, and those inside the frosting outdoor space at −12 ±
Thermodynamic mechanism of high energy performance of air source heat pump with coupled liquid-storage
This study proposed a novel air source heat pump system (NASHPs) with coupled liquid-storage and gas-separator to prevent an air source heat pump (ASHP) from frosting. Compared to the original air source heat pump system (OASHPs), the proposed system delayed frost by 30 min and shortened defrosting time by 72 s in a cycle.
Retarding frosting of an air source heat pump by using vapor
Frosting as a performance issue in Air-Source Heat Pumps (ASHP) systems occurs normally under air temperature between −7 to 5.5 C and a relative humidity above 60 %. The frosting deteriorates the heating capacity of an ASHP and sometimes can lead to the system shutdown.
A new frosting map of variable-frequency air source heat pump in severe cold region considering the variation of heating
Metal energy storage (MES) had a negative impact of −7.5 % on defrosting efficiency due to a large amount of energy required to heat MCHX. Moreover, the negative influence of frost melt water and retained water on defrosting efficiency was −9.5 % and −1.9 %, respectively.
Jiankai DONG | Professor (Associate) | PhD | Harbin Institute of Technology, Harbin | HIT | Department of Building Thermal Energy
Jiankai DONG, Professor (Associate) | Cited by 1,350 | of Harbin Institute of Technology, Harbin (HIT) | Read 51 publications | Contact Jiankai DONG
Improving the frosting and defrosting performance of air source
Read this article. When air source heat pump (ASHP) units operate in heating mode at low temperatures in high humidity environments, frost forms and
A review of frosting in air-to-air energy exchangers | Request
However, membrane frosting and clogging may occur in MEEs, which has drawn a lot of attention [17][18][19][20][21]. The frosting problem of the air-to-air energy exchangers was reviewed [21], and
Techno-economic analysis on frosting/defrosting operations for
1. Introduction. In recent decades, air source heat pump (ASHP) units have been used in applications worldwide due to their advantages of being highly efficient, environmentally
Improving the frosting and defrosting performance of air source
Frosting is an unde-sirable phenomenon which adversely afects the oper-ational performance and energy eficiency of ASHP units; in order to improve the frosting performance of ASHP units, diferent frost-retardation measures have been undertaken in the past decades (Figure 6). 3.1. External measures.
Techno-economic analysis on frosting and defrosting operations of an air
The uneven frosting on air source heat pumps'' (ASHPs) outdoor coils is undesired product, as it comes with additional defrosting energy consumption and may aggravate the frosting consequence. Homogenizing the uneven frosting may help suppressing frosting.
Research of anti-frosting technology in refrigeration and air conditioning fields
Metal energy storage (MES) had a negative impact of −7.5 % on defrosting efficiency due to a large amount of energy required to heat MCHX. Moreover, the negative influence of frost melt water and retained water on defrosting efficiency was −9.5 % and −1.9 %, respectively.
The effect of PM2.5 air pollution on the frosting process of outdoor finned-tube
Request PDF | The effect of PM2.5 air pollution on the frosting process of outdoor finned-tube a novel reverse-cycle defrosting method based on phase change energy storage was developed
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Thermal performance of integrated collector storage solar air heater with evacuated tube
If an integrated collector storage solar water heater is still used, then an additional air–water heat exchanger is needed to increase energy quality and system efficiency. Air as an HTF has no problems with icing, scaling, and
The study of dynamic characteristics on a novel air source heat pump coupled with liquid-storage gas-liquid separator under non frosting
Air source heat pump is widely used for heating as it has high efficiency and environmentally friendly advantages, but there is frosting issue in low temperature and high humidity conditions. In order to improve the performance of air source heat pump (ASHP) when its evaporator is subject to frosting, a novel ASHP system coupled with liquid
Heating and energy storage characteristics of multi-split air source heat pump based on energy storage defrosting
Study on heating and energy storage for multi-split air source heat pump unit. • Indoor units affected frosting, heating and energy storage performances notably. • Optimal time of energy storage operation was around
Experimental study on the melted frost influence on the metal energy storage during an air source heat pump defrosting
At the frosting/heating mode, the temperatures of fin and tube surface are low, and thus the thermal energy stored in the metal is also low. At the defrosting/cooling mode, the temperature of metal should be increased, and meanwhile the metal thermal energy storage increased.
Energies | Free Full-Text | Effect of Different Plenum
The performance of the air-cooler in refrigeration systems plays a key role in their energy efficiency. Here, the plenum-chamber coefficient was defined to investigate a possible way of enhancing the
A semi-experimental method for evaluating frosting performance of air source heat pumps
Ye et al. [28] studied the correlation between air velocity and frosting rate, and verified the existence of a critical air velocity that maximized the mass transfer in frosting process. Zhang et al. [29,30] investigated the deposition of frosting on the surface of FTHXs, and reported that the amount of frost deposited on the edge of the fins'' inlet
Prediction of the frost growth and performance change of air source heat pump system under various frosting conditions
In order to improve the performance of air source heat pump (ASHP) when its evaporator is subject to frosting, a novel ASHP system coupled with liquid-storage gas-liquid separator was proposed in previous work, which was
