Mathematical modeling of an air split-conditioner heat pump operation for investigation its exergetic efficiency

Labay, Volodymyr; Yaroslav, Vitaliy; Dovbush, Oleksandr; Tsizda, A. Ye.

doi:10.23939/mmc2020.01.169

Cited by 11 publications

(14 citation statements)

References 4 publications

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“…Investigations of the results bringing the operation of heat pumps of air split-conditioners to the same internal temperature conditions and exergetic OIR are carried out on one-stage steam-compressor freon heat pumps of air split-conditioners (without effective cooling of the compressor ), which applies to air split-conditioners, the scheme is shown in Fig. 1a, and described in article [18]. The operation of the heat pump and the calculation of energy efficiency based on the construction of its thermodynamic process of operation on (p, i)-diagram (Fig.…”

Section: Methods Materials and Results Of Researchesmentioning

confidence: 99%

“…Successful application of the exergetic method of analysis for different technical systems, in particular of refrigerating machines of air split-conditioners, have been grounded in the works of R. K. Clausius, John W. Gibbs, G. Gouy, A. Stodola, J. Shargut, R. Petela and V. M. Brodyansky for their technical and economic optimization and our works [8][9][10][11][12][13][14][15][16][17][18]. We have adapted this method to the analysis of heat pumps of air split-conditioners [18] and used in this article.…”

Section: Analysis Of Reference Data and Problem Solvingmentioning

confidence: 99%

“…However, heat pumps of air split-conditioners belong to energy-intensive equipment and, therefore, they need the increase in their energy efficiency, which can be achieved as perfectly as possible by conducting their exergetic analysis, i.e. the modern thermodynamic methods [8][9][10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…Exergetic analysis allows with sufficient scientific accuracy and at the same time more clearly determine the degree of perfection and sources of losses in the installations and their parts and finally find ways to improve them [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the authors developed an exergetic method of analyzing the operation of one-stage steamcompressor freon heat pumps of air split-conditioners (without effective cooling of the compressor ), which is adapted for these split-conditioners and described in detail in [18]. This method uses the principle scheme of the heat pump of air split-conditioners (Fig.…”

Section: Introductionmentioning

confidence: 99%

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Mathematical modeling bringing the operation of air split conditioners heat pumps to the same internal temperature conditions

Labay¹,

Yaroslav²,

Dovbush³

et al. 2021

Math. Model. Comput.

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Nowadays, the use of heat pumps (HP) of air split-conditioners in air conditioning and heating systems of small industrial, public and residential facilities is becoming more common. It is known that the nominal heat capacity of HP of air split-conditioners is given in catalogs or reference literature under standard outdoor temperature conditions, namely: outdoor air temperature +7oС, indoor air temperature +21oС. At the same time, manufacturers of air split-conditioners do not ensure that, regardless of the size of heating capacity, all air split-conditioners have the same internal temperature conditions, namely: the evaporation temperature of the refrigerant and its condensation temperature. In this case, the thermodynamic efficiency, which can be best assessed by the exergetic output-input ratio (OIR) of different heating capacity of HP of air split-conditioners, is different; this, in our opinion, is incorrect. However, today there is a lack of mathematical models of bringing the operation of air split-conditioners HP to the similar internal temperature conditions, which will allow us to obtain the same exergetic OIR for different heating capacity of HP. To create the mathematical model of bringing the operation of HP of air split-conditioners to the equal internal temperature conditions, we have proposed them, namely: the evaporation temperature of the refrigerant +0.7oC and its condensation temperature +40oC. Taking these temperatures on the basis of the heat balances of the HP evaporator and HP condenser of air split-conditioners, we obtained the dependences for calculating air flow rates on the evaporator and condenser, which respectively maintain the proposed temperatures.

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Section: Methods Materials and Results Of Researchesmentioning

confidence: 99%