Cooling mode fault detection and diagnosis method for a residential heat pump

Kim, Min Soo; Yoon, Seok Ho; Payne, William V.; Domanski, Piotr A.

doi:10.6028/nist.sp.1087

Cited by 17 publications

(12 citation statements)

References 26 publications

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“…As reported elsewhere in the literature, the deterioration of the performance of the HP is more severe at undercharged conditions than at overcharged conditions; this may possibly be attributed to the effects of lesser refrigerant flow rates, high discharge temperatures and subsequent reduced compressor efficiency [11,12]. This was demonstrated in this study, where lower COP values were recorded at a lower refrigerant charge (1350 grams) as depicted in Figure 4 which were 2.97 and 3.22 for CONF.…”

Section: Impact Of Refrigerant Cbargesupporting

confidence: 78%

Experimental comparative study of an open and completely closed air source heat pump for drying sub-tropical fruits

Kivevele

Huan

2015

2015 International Conference on the Industrial and Commercial Use of Energy (ICUE)

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Abstraet-Heat pump drying (HPD) is an energy efficient and environmentally friendly drying method. Heat pumps (HPs) deliver more heat during the drying process than the work input to the compressor. The performance of HP and the dryer is significantly affected by the surrounding conditions. Therefore, the present study investigates the performance of an open and completely closed air duct HPD systems. Also, the influence of refrigerant charge and condenser fan speed was evaluated. The results demonstrated that, the completely closed air duct HPD system had slightly higher coefficient of performance (COP) and heating capacity than the open HPD system because of the heat from the moist exhausted air from the dryer were recovered at the evaporator. However, the drying air temperatures for the closed HPD system were lower than that of open system. This was due to the circulation of cold air from the evaporator. Also, COP increased with the increase of refrigerant charge in both systems. But, at high refrigerant charge the COP values for both systems were decreased because of the decrease in heating capacity which was possible due to the accumulation of refrigerant in the condenser. Similar trend of results were observed at high condenser fan speed, this was due to the increased fan power consumption. Therefore, for the system developed, the optimum refrigerant charge was observed to be 1650 grams and 840 rpm of condenser fan speed (60% of the full speed) and the obtained COP values at this point were 3.85 and 3.75 for the closed and open HPD system, respectively.Key words: heat pump dryer, drying of fruits, refrigerant charge, thermal performance NOMENCLATURE COP CONF.l CONF.2 HP HPD coefficient of performance configuration 1 (open HP dryer) configuration 2 (completely closed HP dryer) heat pump heat pump drying

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Section: Impact Of Refrigerant Cbargesupporting

confidence: 78%

Experimental comparative study of an open and completely closed air source heat pump for drying sub-tropical fruits

Kivevele

Huan

2015

2015 International Conference on the Industrial and Commercial Use of Energy (ICUE)

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“…To contrast the differences, Table 4 presents diagnostic rules for T SH and T SC reported for a TXV-equipped split system [31] and a rooftop air conditioner equipped with a FXO [32]. The diagnostic rules for the FXO-equipped air conditioner do not agree in several cases with those listed for the TXV-equipped systems.…”

Section: Effect Of Faults On Performancementioning

confidence: 99%

Effect of common faults on the performance of different types of vapor compression systems

Domanski

Payne

2016

Applied Thermal Engineering

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The effect of faults on the cooling capacity, coefficient of performance, and sensible heat ratio, was analyzed and compared for five split and rooftop systems, which use different types of expansion devices, compressors and refrigerants. The study applied multivariable polynomial and normalized performance models, which were developed for the studied systems for both fault-free and faulty conditions based on measurements obtained in a laboratory under controlled conditions. The analysis indicated differences in responses and trends between the studied systems, which underscores the challenge to devise a universal FDD algorithm for all vapor compression systems and the difficulty to develop a methodology for rating the performance of different FDD algorithms.

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“…In earlier work the National Institute of Standards and Technology (NIST) made detailed measurements on the cooling (Kim et al, 2006) and heating [(Payne et al, 2009), (Yoon et al, 2011)] performance of a residential, split-system, air-source, heat pump with faults imposed. Previous research on FDD techniques [e.g., (Rossi and Braun, 1997), (Braun, 1999), (Chen and Braun, 2001)] was used to refine a rule-based chart technique able to detect and diagnose common faults which can occur during operation of an air conditioner (AC) and heat pump (HP) [ (Kim et al, 2008b), (Kim et al, 2010)].…”

Section: Previous Studiesmentioning

confidence: 99%

“…Following the previous NIST study on residential HP and AC FDD (see Kim et al 2008b), the three independent features, T OD , T ID , T IDP , and seven dependent features, T E , T SH , T C , T D , T SC , ΔT EA , ΔT CA were chosen for self training (Table 2.1). The value of the seven dependent features can be correlated as functions of the three independent features within the three-dimensional operating data domain.…”

Section: Measurement Features For Self Trainingmentioning

confidence: 99%

Self-training of a fault-free model for residential air conditioner fault detection and diagnostics

Heo¹,

Payne²,

Domanski³

et al. 2015

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Use of Non-SI Units in a NIST Publication The policy of the National Institute of Standards and Technology is to use the International System of Units (metric units) in all of its publications. However, in North America in the heating, ventilation and airconditioning industry, certain non-SI units are so widely used instead of SI units that it is more practical and less confusing to include some measurement values in customary units only.

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Cooling mode fault detection and diagnosis method for a residential heat pump

Cited by 17 publications

References 26 publications

Experimental comparative study of an open and completely closed air source heat pump for drying sub-tropical fruits

Experimental comparative study of an open and completely closed air source heat pump for drying sub-tropical fruits

Effect of common faults on the performance of different types of vapor compression systems

Self-training of a fault-free model for residential air conditioner fault detection and diagnostics

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