Adaptive defrost

Allard, Jeanie; Heinzen, Roland

doi:10.1109/28.87247

Cited by 12 publications

(6 citation statements)

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“…Defrosting is a process that melts the frost away from evaporator coils and is unavoidable for most systems. The defrost system can work either by heating the evaporator coils or turning off the system [20]. An automatic defrost system exists in the studied freezer room which kicks in every 6 h and heats up the evaporator coils to melt the frost.…”

Section: Temperature Spikesmentioning

confidence: 99%

An inverse method for calculation of thermal inertia and heat gain in air conditioning and refrigeration systems

2015

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Section: Temperature Spikesmentioning

confidence: 99%

An inverse method for calculation of thermal inertia and heat gain in air conditioning and refrigeration systems

2015

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“…Defrosting is a process that melts the frost away from evaporator coils and is unavoidable for most systems. The defrost system can work either by heating the pipes or turning off the refrigeration system [32]. The defrost system in the studied freezer operates every 6 hr.…”

Section: Authorsmentioning

confidence: 99%

A Resistance–Capacitance Model for Real-Time Calculation of Cooling Load in HVAC-R Systems

Fayazbakhsh

Bagheri

Bahrami

2015

Journal of Thermal Science and Engineering Applications

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Simulating the real-time thermal behavior of rooms subject to air conditioning (AC) and refrigeration is a key to cooling load calculations. A well-established resistance–capacitance (RC) model is employed that utilizes a representative network of electric resistors and capacitors to simulate the thermal behavior of such systems. A freezer room of a restaurant is studied during its operation, and temperature measurements are used for model validation. Parametric study is performed on different properties of the system. It is shown that a reduction of 20% in the walls thermal resistivity can increase the energy consumption rate by 15%. The effect of set points on the number of compressor starts/stops is also studied, and it is shown that narrow set points can result in a steady temperature pattern in exchange for a high number of compressor starts/stops per hour. The proposed technique provides an effective tool for facilitating the thermal modeling of air conditioned and refrigerated rooms. Using this approach, engineering calculations of cooling load can be performed with outstanding simplicity and accuracy.

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“…The control cost of these two methods is high and the stability of control accuracy is poor. In addition, there are maximum average heat supply control method [14,15], ultrasonic control defrosting [16], heat conduction and radiation control defrosting [17], effective mass flow fraction control method [18], refrigerant flow control method [19], etc. The above defrosting control methods have their own advantages and disadvantages, which are suitable for different refrigeration systems and control occasions with different precision requirements.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Current Control Defrosting Method of Multi-split Variable Refrigerant Flow System

Liu¹,

Liu²,

Wang³

et al. 2020

International Journal of Thermodynamics

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There are many indoor units in the multi-split variable refrigerant flow (VRF) system. The continuous operation of heating in winter is longer than that of ordinary household air conditioning, so that the precise defrosting control is energy-saving and improves the comfort for users. In this paper, during the experiment, the indoor temperature was 20℃, the outdoor dry bulb temperature was 7℃, 0℃,-5℃ and-7℃, and the wet bulb temperature was 6℃, 0℃,-6 ℃ and-8℃ respectively. The defrosting temperature, liquid pipe temperature, defrosting time and the current value change rate of the condenser fan were compared when the heating capacity was reduced by 15%. The experiments showed that the current change rate was only related to the frost mass rather than the outdoor temperature. The best fan current change rate was 15%-20% when to defrost for the VRF system. Compared with the traditional defrosting, the phenomenon of thermosensor falling off and the uneven frost formation had little impact on the current control defrosting.

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Adaptive defrost

Cited by 12 publications

References 0 publications

An inverse method for calculation of thermal inertia and heat gain in air conditioning and refrigeration systems

An inverse method for calculation of thermal inertia and heat gain in air conditioning and refrigeration systems

A Resistance–Capacitance Model for Real-Time Calculation of Cooling Load in HVAC-R Systems

Investigation on Current Control Defrosting Method of Multi-split Variable Refrigerant Flow System

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