Comparison of the performance of capacity controlled and conventional on/off controlled heat pumps

Tassou, S.A.; Marquand, C.J.; Wilson, D.R.

doi:10.1016/0306-2619(83)90051-x

Cited by 34 publications

(11 citation statements)

References 1 publication

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“…(11) shows that, as previously stated, a change in capacity also necessitates changes in heat transfer media flow rates in order to optimise the efficiency. The magnitude of the change will depend on the heat exchanger characteristics and on the efficiencies of the pumps and the compressor.…”

Section: Matching Of Media Flowsmentioning

confidence: 86%

Capacity-controlled ground source heat pumps in hydronic heating systems

Karlsson¹,

Fahlén

2007

International Journal of Refrigeration

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Section: Matching Of Media Flowsmentioning

confidence: 86%

Capacity-controlled ground source heat pumps in hydronic heating systems

Karlsson¹,

Fahlén

2007

International Journal of Refrigeration

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“…Tassou et al [4,[37][38][39][40] investigated the most fact of the variable speed capacity control methods, and they focused on the capacity modulation of domestic size of heat pumps. Energy conservation via capacity control and performance comparison with conventional systems, effects of capacity modulation, mathematical modeling of variable speed systems, part load, and dynamic performance analysis of heat pumps are the important issues investigated.…”

Section: Multiple Compressor Capacity Controlmentioning

confidence: 99%

Refrigeration System: Capacity Modulation Methods

Ekren¹

2017

Refrigeration

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Energy conservation and reduction of the global warming effect become one of the most important subjects in the world. Since refrigeration system energy consumption is steadily increasing in overall energy consumption, this system is under research. Refrigeration systems are full of energy conservation that is having minimum energy consumption while satisfying the user's needs. Refrigeration system applications where the load may vary over a wide range, due to lighting, product loading, ambient weather variations, or other factors during operation, can be optimized by capacity modulation. There are many ways to achieve capacity modulation. This paper presents literature review of various capacity modulation methods which reduce the energy consumption of the refrigeration system and decrease CO 2 emission indirectly. In this paper, on/off control, digital scroll compressor, cylinder unloading, hot gas bypass, slide valve, multiple compressor, and variable speed capacity control methods are presented. In addition, electrical control techniques for the refrigeration capacity modulation applications are summarized.

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“…In a linear compressor, the flow rate is controlled by amplitude modulation which means that there is no need for stop-start operation in which temperature gradients have to be re-established; Tassou et al (1983). The linear compressor is a free piston system, so that the cooling capacity can be modulated by the piston stroke control.…”

Section: Introductionmentioning

confidence: 99%

Piston position sensing and control in a linear compressor using a search coil

Liang

Stone

Dadd

et al. 2016

International Journal of Refrigeration

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Linear compressors with clearance seals are well established for cryocoolers using either a Stirling cycle or pulse tube. However, both piston stroke and piston offset require detection and control in valved compressors. In order to manufacture linear compressor in large scale, then a simple, robust, and cheap control system is required with a minimum of sensors and actuators. This work introduces an approach to sensing the position of the piston using a search coil. The piston stroke is detected by calculating the peak-to-peak flux linkage in relation to the measured drive voltage and current. The piston offset is proportional to an integrated modulus of the back electromotive force (emf) of the search coil. Two PID (proportional-integral-derivative) controllers were developed to control the piston stroke by adjusting the drive voltage and a solenoid valve and bleed flow to control the piston offset. Experimental results validate the proposed compressor control technique.

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Comparison of the performance of capacity controlled and conventional on/off controlled heat pumps

Cited by 34 publications

References 1 publication

Capacity-controlled ground source heat pumps in hydronic heating systems

Capacity-controlled ground source heat pumps in hydronic heating systems

Refrigeration System: Capacity Modulation Methods

Piston position sensing and control in a linear compressor using a search coil

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