Application Study of Newly Developed Turbo Heat Pump for 130 Degrees Celsius Water for an Industrial Process

This paper reports application study of newly developed turbo heat pump for 130 degrees Celsius (°C) water for an industrial process in an actual factory. The heat pump is characterized by high efficiency and large heat output, by using a state-of-the-art turbo compressor. The heat pump requires a low temperature heat source in order to achieve high efficiency. The heat demand is for several drying furnaces in the factory, which requires producing hot air of 120 °C. The heat exchanger was designed to produce the hot air. Experiments were conducted to confirm the performance of the heat exchanger under a reduced size of the heat exchanger. Low temperature heat sources are from both exhaust gas of the drying furnaces and that of an annealing furnace. The heat exchangers were also designed to recover heat of the exhaust gas from the two types of furnace. A thermal storage tank was prepared for the low temperature heat source, and for adjusting the time difference between the heat demand and the low temperature heat source. The size of the tank was determined by considering the schedule of furnaces operations. As a result of the present study, it was confirmed that the heat pump was able to satisfy the present heat demand while retaining high efficiency. Primary energy consumption and CO2 emission of the heat pump were calculated on the basis of the present results in order to compare them with those of the boilers.

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Analysis and Comparison of Some Low-Temperature Heat Sources for Heat Pumps

Energies ◽

10.3390/en12101853 ◽

2019 ◽

Vol 12 (10) ◽

pp. 1853 ◽

Cited By ~ 3

Author(s):

Pavel Neuberger ◽

Radomír Adamovský

Keyword(s):

Heat Transfer ◽

Low Temperature ◽

Heat Source ◽

Heat Pump ◽

Heat Exchangers ◽

Ambient Air ◽

Heat Transfer Fluid ◽

Heat Sources ◽

Ground Heat Exchangers ◽

Temperature Heat

The efficiency of a heat pump energy system is significantly influenced by its low-temperature heat source. This paper presents the results of operational monitoring, analysis and comparison of heat transfer fluid temperatures, outputs and extracted energies at the most widely used low temperature heat sources within 218 days of a heating period. The monitoring involved horizontal ground heat exchangers (HGHEs) of linear and Slinky type, vertical ground heat exchangers (VGHEs) with single and double U-tube exchanger as well as the ambient air. The results of the verification indicated that it was not possible to specify clearly the most advantageous low-temperature heat source that meets the requirements of the efficiency of the heat pump operation. The highest average heat transfer fluid temperatures were achieved at linear HGHE (8.13 ± 4.50 °C) and double U-tube VGHE (8.13 ± 3.12 °C). The highest average specific heat output 59.97 ± 41.80 W/m2 and specific energy extracted from the ground mass 2723.40 ± 1785.58 kJ/m2·day were recorded at single U-tube VGHE. The lowest thermal resistance value of 0.07 K·m2/W, specifying the efficiency of the heat transfer process between the ground mass and the heat transfer fluid, was monitored at linear HGHE. The use of ambient air as a low-temperature heat pump source was considered to be the least advantageous in terms of its temperature parameters.

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Determination of Heat Transfer Characteristics of Solar Thermal Collectors as Heat Source for a Residential Heat Pump

Journal of Solar Energy Engineering ◽

10.1115/1.4033595 ◽

2016 ◽

Vol 138 (4) ◽

Author(s):

Maarten G. Sourbron ◽

Nesrin Ozalp

Keyword(s):

Heat Transfer ◽

Heat Transfer Coefficient ◽

Low Temperature ◽

Heat Source ◽

Heat Pump ◽

Solar Collector ◽

Heat Transfer Characteristics ◽

Pump System ◽

Heat Pump System ◽

Temperature Heat

With reducing energy demand and required installed mechanical system power of modern residences, alternate heat pump system configurations with a possible increased economic viability emerge. Against this background, this paper presents a numerically examined energy feasibility study of a solar driven heat pump system for a low energy residence in a moderate climate, where a covered flat plate solar collector served as the sole low temperature heat source. A parametric study on the ambient-to-solarfluid heat transfer coefficient was conducted to determine the required solar collector heat transfer characteristics in this system setup. Moreover, solar collector area and storage tank volume were varied to investigate their impact on the system performance. A new performance indicator “availability” was defined to assess the contribution of the solar collector as low temperature energy source of the heat pump. Results showed that the use of a solar collector as low temperature heat source was feasible if its heat transfer rate (UA-value) was 200 W/K or higher. Achieving this value with a realistic solar collector area (A-value) required an increase of the overall ambient-to-solarfluid heat transfer coefficient (U-value) with a factor 6–8 compared to the base case with heat exchange between covered solar collector and ambient.

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Thermodynamic analysis of the heat pump steam system with medium-low temperature heat source

Energy Reports ◽

10.1016/j.egyr.2021.10.032 ◽

2021 ◽

Vol 7 ◽

pp. 266-278

Author(s):

Shuaiqi Li ◽

Shihui He ◽

Wenji Song ◽

Zipping Feng

Keyword(s):

Low Temperature ◽

Heat Source ◽

Heat Pump ◽

Thermodynamic Analysis ◽

Temperature Heat ◽

Steam System

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The Optimal Peak-Adjusting Parameters of Low-Temperature Heat Source Heating

Solar Energy ◽

10.1115/isec2005-76235 ◽

2005 ◽

Author(s):

Ronghua Wu ◽

Chenghu Zhang ◽

Dexing Sun

Keyword(s):

Low Temperature ◽

Heat Source ◽

Heat Pump ◽

Water System ◽

Weather Conditions ◽

Integrated System ◽

Hot Water ◽

Cold Weather ◽

Design Parameters ◽

Temperature Heat

The integrated low and high temperature heating water system consists of heat pump heat source and boiler heat source. The heat pump heat source abstract heat from low temperature heat source and produce hot water up to 65°C. During mild weather, the 65°C hot water is sufficient for building heating. During cold weather conditions, the boiler heat source will have to be used to produce hot water at 90°C or higher to satisfy the building comfort. To improve the system economy, the integrated system has to maximize the use of the low temperature heat source since it is free. This paper presents a theoretical models and analysis to optimize the system design parameters.

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Determination of Heat Transfer Characteristics of Solar Thermal Collectors as Heat Source for a Residential Heat Pump

Volume 6B: Energy ◽

10.1115/imece2015-51461 ◽

2015 ◽

Author(s):

Maarten G. Sourbron ◽

Nesrin Ozalp

Keyword(s):

Heat Transfer ◽

Heat Transfer Coefficient ◽

Low Temperature ◽

Heat Source ◽

Transfer Coefficient ◽

Heat Pump ◽

Solar Collector ◽

Solar Thermal ◽

Heat Transfer Characteristics ◽

Temperature Heat

One of the best ways of making efficient use of energy in residential units is to use heat pump. Heat pump performance can be further enhanced by integrating a solar thermal unit to provide hot water and subsidize space heating. This paper presents numerically examined energy feasibility study of a solar driven heat pump system for a low energy residence, where a flat plate solar collector served as the sole low temperature heat source. A parametric study on the ambient-to-solar fluid heat transfer coefficient has been conducted to determine the required solar collector heat transfer characteristics in this system. Solar collector area and storage tank volume were varied to investigate their impact on the system performance. A new performance indicator availability was defined to assess the contribution of the solar collector as low temperature energy source of the heat pump. Results showed that the use of a solar collector as low temperature heat source was feasible if its heat transfer rate (UA-value) was 200 W/K or higher. Achievement of this value with a realistic solar collector area (A-value) required an increase of the overall ambient-to-solar fluid heat transfer coefficient (U-value) with a factor of 6 to 8 compared to the base case with only natural convection heat exchange between solar collector cover and ambient.

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Perspective Performance Evaluation Technique for a Cascade Heat Pump Plant Functions at Low Temperature Heat Source

International Journal of Economy Energy and Environment ◽

10.11648/j.ijeee.20170202.11 ◽

2017 ◽

Vol 2 (2) ◽

pp. 13 ◽

Cited By ~ 2

Author(s):

Ali H. Tarrad

Keyword(s):

Performance Evaluation ◽

Low Temperature ◽

Heat Source ◽

Heat Pump ◽

Evaluation Technique ◽

Temperature Heat ◽

Pump Plant

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Sludge Drying by Virtue of the Solar Energy and Reclaimed Water Heat Pump with Double High-Temperature Heat Source

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.756-759.4621 ◽

2013 ◽

Vol 756-759 ◽

pp. 4621-4625

Author(s):

Xu Xiao ◽

Xiao Jun Xu ◽

Tang Zhen Guan ◽

Xin Zheng ◽

Xiao Hong Chen ◽

...

Keyword(s):

High Temperature ◽

Solar Energy ◽

Moisture Content ◽

Heat Source ◽

Heat Pump ◽

High Efficiency ◽

Sewage Treatment ◽

Reclaimed Water ◽

Heating Source ◽

Temperature Heat

Sludge is the solid waste that generated during the sewage treatment process, because of high moisture content limits the final disposal and utilization. In this paper that solar and reclaimed water as heating heat source, It's not easy to design a new drying procedure that solar energy and reclaimed water heat pump with double high-temperature heat source, the system could make full use of respective advantages which of the solar energy, the hot of reclaimed water and heat pump. It would enhance the dehydration ratio, and high efficiency, lower energy consumption, sludge of moisture content (MC) decreased greatly; have created favorable conditions for the reuse. Technology what solar energy, air and reclaimed water heat pump with double high-temperature heat source were used to deal with sludge, the solar energy and air source heat pump were the main heating source. When the heat was insufficient, reclaimed water heat pump was turned on as energy supplementary. The dry air (70°C) was pumped into drying room continually; the moisture content (MC) of sewage was shrunk from 75% to 40% after drying.

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