Closed-loop oscillating heat-pipe with check valves (CLOHP/CVs) air-preheater for reducing relative humidity in drying systems

Meena, P.; Rittidech, S.; Poomsa-ad, Nattapol

doi:10.1016/j.apenergy.2006.09.009

Cited by 27 publications

(10 citation statements)

References 2 publications

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“…Meena [9] used a CLOHP/CV air-preheater for recovering the waste heat from the drying cycle to reduce the relative humidity and achieve energy thrift. Ahmadzadehtalatapeh and Yau [10] studied the effect of heat pipe heat exchangers on the existing air conditioning system of a hospital ward located ina tropical region.It was found that by applying the new design, a considerable amount of energy and power could be saved.Yau [11] developed an 8-row thermosyphon-based heat pipe heat exchanger (HPHX) for tropical building HVAC systemsfor dehumidification enhancement.Hagens et al [12] done measurements and predictions of a heat pipe heat exchanger with two filling ratios of R134a, varying air flow rate and input temperature, and suggested that a heat pipe equipped heat exchanger is a good alternative for air-air exchangers in process conditions when air-water cooling is impossible, typically in warmer countries. Laubscher and Dobson [13] developed a novel heat pipe heat exchanger which circumvents the need for an intermediate coolant loop, using Dowtherm-A as working fluid.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Air-to-Air Counter Flow Heat Pipe Heat Exchanger for Heat Recovery System

Rathod¹

2017

International Advanced Research Journal in Science, Engineering

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This paper deals with the waste heat recovery using heat pipe heat exchanger. Heat pipe is a device which carries the heat from high temperature region & ejects it to the cold or low temperature region. The advantage of using a heat pipe over other conventional methods is that large quantities of heat can be transported through a small crosssectional area over a considerable distance with no additional power input to the system. The heat pipe heat exchangers are used in heat recovery applications to cool the incoming fresh air. Two streams of fresh and return air are connected with heat pipe heat exchanger to investigate the thermal performance and effectiveness of heat recovery system. The aim of this project work is to investigate the thermal performance and effectiveness of heat pipe heat exchanger for heat recovery applications by measuring the temperature difference of warm and cold air through the evaporator and condenser side. The hot-air temperature increased from 60 to 90 0 C; the heat-transfer rate increased slightly. The mass flow rate of hot air increased from 0.30997, 0.4643, 0.4889, 0.508 kg/s led to a slight increase in effectiveness. As the hot-air temperature increases from 60 to 90 0 C, the effectiveness slightly increased.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Air-to-Air Counter Flow Heat Pipe Heat Exchanger for Heat Recovery System

Rathod¹

2017

International Advanced Research Journal in Science, Engineering

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“…It is found from the study that, the thermal effectiveness decreases when the working fluid changes from R134a to MP39 or increase the mass flow rate of cooling fluid (Kammuang-Lue et al, 2006). The CLOHP with check valves (CLOHPCV hereafter) has been applied for reducing relative humidity in drying system and it can reduce relative humidity and achieve energy thrift (Meena et al, 2007). Heat rejected from a split-type residential air conditioner was recovered for clothes drying in residential buildings.…”

Section: Introductionmentioning

confidence: 99%

Mathematical Model of the Optimum Heat Pipe Heat Exchanger for a Condenser of Vapor-Compression Refrigeration Cycle

Yeunyongkul¹,

Sakulchangsatjatai²,

Terdtoon³

2010

Energy Research J.

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Problem statement: This study theoretically investigated applying heat pipe as a heat exchanger in the condenser of vapor compression refrigeration system for sustainable well-being. Splittype air conditioner for residential propose was considered. To reduce pressure drop and recover heat from the condensing process of the refrigeration cycle, this investigation tried to use Closed Loop Oscillating Heat Pipe (CLOHP) instead of the conventional condenser in split-type air conditioner. Approach: The system was single stage with reciprocating compressor which operated at steady state. The refrigerating capacity was 12,500 Btu h −1 and refrigerant was R22. The vapor compression refrigeration system was simulated to determine effect of mass flow rate of refrigerant on various parameters; such as refrigerating capacity, compressor power, heat rejection of condenser and Coefficient of Performance. Results: It was found that, at the normal operating and 3,663 W of the cooling load, mass flow rate of refrigerant, compressor power, heat rejection of condenser and Coefficient of Performance were 0.031 kg sec

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“…Rittidech et al [4] : studies the correlation to predict heat transfer of a closed-looped oscillating heat-pipe with check valves (CLOHP/CV). Meena et al [5] : studies the application of closed-loop oscillating heat-pipe with check valves (CLOHP/CV) air-preheater for reduced relative-humidity in drying systems. It was found that the (CLOHP/CV) airpreheater can be reduced relative humidity in a drying system.…”

Section: Introductionmentioning

confidence: 99%

Effect of Evaporator Section Lengths and Working Fluids on Operational Limit of Closed Loop Oscillating Heat Pipes with Check Valves (CLOHP/CV)

Meena¹

2009

American Journal of Applied Sciences

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This research aims to the effect of evaporator section lengths and working fluids on operational limit of closed loop oscillating heat pipes with check valves (CLOHP/CV) with R123 Ethanol and Water were used as the working fluids. A set of CLOHP/CV was made of copper tubes in combination of following dimension: 1.77 mm inside diameter: 10 turns: 5, 10 and 15 cm equal lengths for evaporator, adiabatic and condenser sections. The working fluid was filled in the tube at the filling ratio of 50%. The evaporator section was given heat by heater while the condenser section was cooled by volume water in a cold bath. The adiabatic section was properly insulated. In the test operation. Which the temperature at the adiabatic section was controlled at 60°C in steady-state condition. From The obtained results obtained, it could be concluded as follows. When the evaporator lengths increased from 5 cm to 10 and 15 cm the critical heat transfer flux decreased. There was working fluids change from R123 to Ethanol and water the critical heat flux decreased.

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Closed-loop oscillating heat-pipe with check valves (CLOHP/CVs) air-preheater for reducing relative humidity in drying systems

Cited by 27 publications

References 2 publications

Experimental Investigation of Air-to-Air Counter Flow Heat Pipe Heat Exchanger for Heat Recovery System

Experimental Investigation of Air-to-Air Counter Flow Heat Pipe Heat Exchanger for Heat Recovery System

Mathematical Model of the Optimum Heat Pipe Heat Exchanger for a Condenser of Vapor-Compression Refrigeration Cycle

Effect of Evaporator Section Lengths and Working Fluids on Operational Limit of Closed Loop Oscillating Heat Pipes with Check Valves (CLOHP/CV)

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