Heat pump coefficient of conversion and power on off-nominal modes

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Abstract

The article considers the variation of heat pump (HP) compression parameters which define its effectiveness: power and coefficient of conversion (μ) on off-nominal modes of operation. Taking into account that the parameters of low-potential sources of heat for HP change, the demand for thermal energy also changes; study of HP operating on off-nominal modes is relevant. To analyze the operating process on partial power modes of HP, a reciprocating compressor is used. The following options are examined by authors as conditions of HP transitioning to the off-nominal mode: change in temperature of water at the condenser inlet; change in flow rate of water passing through the condenser, change in flow rate of the working medium. Based on the analysis of relationships for determining the coefficient of conversion and power consumed by HP, it is shown that these parameters change if HP transitions to off-nominal mode. The increase of temperature entering the condenser leads to decrease in μ, and with temperature decrease μ increases. Decrease in flow rate of water cooling the condenser moves the beginning point of compression of the working medium to higher moisture region and reduces the efficiency of the compressor. Working medium flow rate decrease virtually does not affect the Carnot cycle efficiency and μ decreases because of rising moisture of gas.

About the authors

Yuriy A Antipov

Peoples’ Friendship University of Russia (RUDN University)

Author for correspondence.
Email: rudn-tit@yandex.ru

Candidate of Technical Sciences, associate professor of the Department of Mechanical and Instrument Engineering, Academy of Engineering, Peoples’ Friendship University of Russia. Research interests: design, production and testing of heat engines elements structures

6, Miklukho-Maklaya str., Moscow, 117198, Russian Federation

Ivan K Shatalov

Peoples’ Friendship University of Russia (RUDN University)

Email: rudn-tit@yandex.ru

Candidate of Technical Sciences, professor of the Department of Mechanical and Instrument Engineering, Academy of Engineering, Peoples’ Friendship University of Russia. Research interests: design and calculation of heat pump systems

6, Miklukho-Maklaya str., Moscow, 117198, Russian Federation

Irina I Shatalova

Peoples’ Friendship University of Russia (RUDN University)

Email: rudn-tit@yandex.ru

Candidate of Agricultural Sciences, associate professor of the Department of Engineering Business and Management, Academy of Engineering, Peoples’ Friendship University of Russia. Research interests: assessment of feasibility of innovation technologies in engineering

6, Miklukho-Maklaya str., Moscow, 117198, Russian Federation

Kirill V Shkarin

Peoples’ Friendship University of Russia (RUDN University)

Email: gohamoha69@gmail.com

assistant of the Department of Mechanical and Instrument Engineering, Academy of Engineering, Peoples’ Friendship University of Russia. Research interests: design, production and testing of heat engines elements structures

6, Miklukho-Maklaya str., Moscow, 117198, Russian Federation

References

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  2. Plastinin P.I. Porshnevye kompressory. Ch. 1: Teoriya i raschet [Reciprocating compressors. Part 1: Theory and calculation]. Moscow: Kolos Publ., 2006. 456 p. (In Russ.)
  3. Fotin B.S., Pirumov I.B., Priluckij I.K., Plastinin P.I. Porshnevye kompressory [Reciprocating compressors]. Leningrad: Mashinostroenie Publ., 1987. 872 p. (In Russ.)
  4. Antipon Y.A., Shatalov I.K., Sobennikov E.V. Influence of Moistness of Working Fluid on Delivery Coefficient of Reciprocating Compressor. Chemical and Petroleum Engineering. 2014. No. 1. 38— 42.
  5. Barskij I.A., Antipov Yu.A., Shatalov I.K., Terekhov D.V. Pokazateli porshnevogo kompressora na chastichnykh rezhimakh [Reciprocating compressor characteristics on partial modes]. Khimicheskoe i neftyanoe mashinostroenie [Chemical and petroleum engineering]. 2011. No. 1. 31—33. (In Russ.)

Copyright (c) 2018 Antipov Y.A., Shatalov I.K., Shatalova I.I., Shkarin K.V.

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