Advances in heat pump systems: A review

Chua, K.J.; Chou, S.K.; Yang, Wenbo

doi:10.1016/j.apenergy.2010.06.014

Cited by 742 publications

(303 citation statements)

References 89 publications

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“…Also, the refrigeration unit for the conventional calorimeter used a refrigerator capacity which was much larger compared to the refrigeration unit for the calorimeter with a heat recovery unit. Moreover, for the calorimeter with heat recovery control methods, when the control (1) method was adopted in the HR unit, the total energy increased between 8% and 13% compared to control (2). This showed that, for testing heat pumps in heating mode, it was better to use the heat recovery unit to control and maintain the inlet water temperature setpoint for the outdoor HX.…”

Section: Calorimeter Control Performance For Heating Operating Modementioning

confidence: 95%

“…Again, the refrigeration unit of the conventional calorimeter utilized a much larger refrigerator capacity compared to the case of the calorimeter with a heat recovery unit. Also, when the control (1) method was adopted in the HR unit, the total energy decreased between 6.4% and 21% as compared to control (2). This implied that, for the experiment in heat pump cooling mode, it was better to use the heat recovery unit to control and maintain the IWT setpoint for the ID heat pump HX.…”

Section: Calorimeter Control Performance In Cooling Operating Modementioning

confidence: 99%

“…The heat recovery control method labelled as control (1) was used to control the inlet water temperature setpoint for the indoor heat pump HX at the indoor side flow loop, with values of 12 • C in cooling mode and 40 • C in heating mode. Similarly, the HR control method, also labelled as control (2), was used to control the IWT setpoint for the outdoor heat pump HX at the outdoor side flow loop. In this case, the temperature was set to 25 • C in cooling mode and 5 • C in heating mode.…”

Section: Test Proceduresmentioning

confidence: 99%

“…This is due to the economic benefit of using heat pumps to extract heat from alternate sources, namely air, water, and the ground [2]. Globally, energy saving potential has become a very important matter to obtain rational development and also reduce carbon emissions [3].…”

Section: Introductionmentioning

confidence: 99%

“…The following deductions were made:  It was observed that for the heat pump test in heating mode, the calorimeter performance was enhanced when the control (2) was used because the total energy savings in the control (2) were about 8 to 13% compared to the control (1).  For cooling operating mode, control (1) was an optimum control option when compared to control (2) as the total energy savings in control (2) were about 6.4 to 21% compared to control (2) method.…”

mentioning

confidence: 99%

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Performance Analysis on the Optimum Control of a Calorimeter with a Heat Recovery Unit for a Heat Pump

Amoabeng

Choi

2018

Energies

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Abstract:Heat pumps are used in many applications, both in households and industries, for space air conditioning and hot water provision. The calorimeter is the equipment used in testing the heat pump system to obtain performance data. In the conventional testing mode and under standard conditions, the calorimeter utilizes a lot of energy through refrigeration and heating systems. In this study, a newly developed calorimeter with a heat recovery unit was used to test the performance of a water-to-water heat pump system. The aim was to minimize the rate of energy used in the conventional calorimeter. Two heat recovery control methods were adopted. In the control (1), the heat recovery unit was used to control the inlet water temperature setpoint for the heat pump indoor heat exchanger, whereas in control (2), the heat recovery unit was used to control the inlet water temperature setpoint for the heat pump outdoor heat exchanger. Tests were executed by varying the operating mode and test conditions. For the heating operating mode, the inlet water setpoint temperatures for the indoor and outdoor heat pump heat exchangers were 40 • C and 5 • C, respectively, whereas for the cooling mode, the inlet water setpoint temperatures for the outdoor and indoor heat pump heat exchangers were 25 • C and 12 • C, respectively. The analyses of the experimental results revealed that the energy saving of the calorimeter with heat recovery was about 71% in cooling mode and 73% in heating mode compared to the conventional calorimeter. Also, the energy consumption of the proposed calorimeter was analyzed based on the control methods. In heating mode, the calorimeter performance was enhanced when the control (2) strategy was used because the energy saving was about 8 to 13% compared to control (1). However, in the cooling mode test, it was the control (1) method that resulted in energy savings of about 6.4 to 21% compared to the control (2) method.

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Section: Calorimeter Control Performance For Heating Operating Modementioning

confidence: 95%

Section: Calorimeter Control Performance In Cooling Operating Modementioning

confidence: 99%

Section: Test Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Performance Analysis on the Optimum Control of a Calorimeter with a Heat Recovery Unit for a Heat Pump

Amoabeng

Choi

2018

Energies

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Handbook of Clean Energy Systems

Rajendran

Ling‐Chin

Roskilly

2015

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Thermal Energy Efficiency in Industrial Processes

Rajendran

Ling‐Chin

Roskilly

2015

Handbook of Clean Energy Systems

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Thermal energy used for heating and cooling represents a significant proportion of total energy use in industrial processes and is largely supplied by fossil fuels. Mechanical operations primarily powered by electricity also consume a large amount of energy. Both heating and cooling operations as well as mechanical operations release large amounts of heat into the environment; therefore, careful management of thermal energy is a key factor in reducing overall energy consumption and emissions. Energy‐related pressures, incentives, and opportunities provide a strong business case to invest in improving energy efficiency. These include customer demand for “green” products, national taxes, and financial incentives, and rising fuel costs. Against this backdrop, the prioritization of the sustainability agenda by research funders coupled with the pressure on research organizations to ensure the transfer of novel technologies to industry creates an ideal landscape for substantial advancement in industrial energy efficiency. Successful movement of novel technology to industry should, however, be supported by concepts, methods, and practices derived from industrial context and needs. Accordingly, initial implementations often bring to light new research challenges, both technical and methodological. To enhance the use of energy‐efficient methods in industry, the definition and measurement of efficiency must be tailored to industrial needs and technologies ready for adoption must be identified and presented in relation to existing technology. In addition, detailed case studies of energy use should be documented to provide insights to both researchers and practitioners, identifying both realistic improvements and barriers to application of energy‐efficient measures.

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Advances in heat pump systems: A review

Cited by 742 publications

References 89 publications

Performance Analysis on the Optimum Control of a Calorimeter with a Heat Recovery Unit for a Heat Pump

Performance Analysis on the Optimum Control of a Calorimeter with a Heat Recovery Unit for a Heat Pump

Handbook of Clean Energy Systems

Thermal Energy Efficiency in Industrial Processes

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