Waste heat recovery using heat pipe heat exchanger (HPHE) for surgery rooms in hospitals
TL;DR: In this article, a heat pipe heat exchanger has been designed and constructed for heat recovery in hospital and laboratories, where the air must be changed up to 40 times per hour, using methanol as the working fluid.
About: This article is published in Applied Thermal Engineering.The article was published on 2000-10-01. It has received 177 citations till now. The article focuses on the topics: Plate fin heat exchanger & Heat recovery ventilation.
Citations
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TL;DR: In this paper, a two-phase closed thermosyphon (TPCT) was used for heat transfer in various input powers and the efficiency of the TPCT increased up to 14.7% when Al 2 O 3 /water nanofluid was used instead of pure water.
237 citations
TL;DR: In this paper, the authors reviewed standards and guidelines on design, installation, commissioning, operation, and maintenance of HVAC installations in hospital operating rooms, indoor thermal conditions, and summarized measured data from short monitoring of indoor thermal condition along with audit results and main characteristics of 20 ORs in 10 major Hellenic hospitals.
231 citations
TL;DR: In this paper, the authors present a review of tubular heat pipe systems for heat recovery and renewable applications utility and show that standard tubular pipe systems present the largest operating temperature range in comparison to other systems and therefore offer viable potential for optimization and integration into renewable energy systems.
Abstract: Advancements into the computational studies have increased the development of heat pipe arrangements, displaying multiphase flow regimes and highlighting the broad scope of the respective technology for utilization in passive and active applications. The purpose of this review is to evaluate current heat pipe systems for heat recovery and renewable applications utility. Basic features and limitations are outlined and theoretical comparisons are drawn with respect to the operating temperature profiles for the reviewed industrial systems. Working fluids are compared on the basis of the figure of merit for the range of temperatures. The review established that standard tubular heat pipe systems present the largest operating temperature range in comparison to other systems and therefore offer viable potential for optimization and integration into renewable energy systems.
228 citations
Cites background from "Waste heat recovery using heat pipe..."
...Noie-Baghban and Majideian [4] carried out work on the design and build of a heat pipe arrangement to be installed in a heat pipe heat exchanger for the purpose of heat recovery in hospital and laboratory buildings where high air change is a primary requirement....
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TL;DR: In this article, two streams of fresh and return air have been connected with heat pipe heat exchanger to investigate the thermal performance and effectiveness of heat recovery system, and the results showed that the effectiveness and heat transfer for both evaporator and condenser sections are also increased to about 48%, when the inlet fresh air temperature is increased to 40°C.
206 citations
TL;DR: A review of small heat pipes, including their design, analysis, and fabrication, is presented in this article, where the authors also discuss the potential of nano-wicks, such as carbon nanotubes (CNTs), to represent the future of heat pipes.
205 citations
Cites background from "Waste heat recovery using heat pipe..."
...This work was first presented in studies of conventional HPs [146-150]....
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References
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Book•
11 Sep 1985
TL;DR: This paper introduced the physical effects underlying heat and mass transfer phenomena and developed methodologies for solving a variety of real-world problems, such as energy minimization, mass transfer, and energy maximization.
Abstract: This undergraduate-level engineering text introduces the physical effects underlying heat and mass transfer phenomena and develops methodologies for solving a variety of real-world problems.
13,209 citations
Book•
01 Mar 1995
TL;DR: In this article, the authors present a detailed analysis of non-conventional heat pipe properties, including variable conductance heat pipes, and their properties in terms of heat transfer and mass transfer.
Abstract: Preface Nomenclature 1.Introduction 2.Solid-Liquid-Vapor Phenomena, Driving Forces and Interfacial Heat and Mass Transfer 3.Steady Hydrodynamic and Thermal Characteristics 4.Heat Transfer Limitations 5.Continuum Transient and Frozen Startup Behavior of Heat Pipes 6.Two-Phase Closed Thermosyphons 7.Rotating and Revolving Heat Pipes 8.Variable Conductance Heat Pipes 9.Capillary Pumped Loop and Loop Heat Pipe Systems 10.Micro/Miniature Heat Pipe Characteristics and Operating Limitations 11.Heat Pipe Heat Exchangers 12.Analysis of Nonconventional Heat Pipes 13.Special Effects on Heat Pipes 14.Heat Pipe Fabrication, Processing, and Testing Appendix A:Thermophysical Properties Appedix B:Experimental Heat Pipe Results Index
1,516 citations
"Waste heat recovery using heat pipe..." refers background in this paper
...Three types of working ̄uid, namely, methanol, water and acetone, which according to reference [1], are compatible with the wick and pipe and applicable within the working temperature range (15±558C), have been considered....
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Patent•
18 Nov 1991TL;DR: In this article, a temperature regulation system for the human body is provided which uses heat pipes to distribute energy to and from portions of a body to provide heating or cooling by redistributing body heat.
Abstract: A temperature regulation system for the human body is provided which uses heat pipes to distribute energy to and from portions of a body to provide heating or cooling by redistributing body heat. The heat pipes are incorporated into a garment, a blanket and a pad which may be used for medical treatment or activities or for activities in environments having extreme temperatures. Supplemental means for heating and cooling are included to improve heating or cooling to a body, and to provide heating or cooling to limited areas of a body.
143 citations
TL;DR: In this paper, an air-to-air heat exchanger using thermosyphon heat pipes was designed, constructed and tested under medium temperature (below 300°C) operating conditions.
Abstract: Using water as the working fluid, air-to-air heat exchangers using thermosyphon heat pipes were designed, constructed and tested under medium temperature (below 300°C) operating conditions. A heat exchanger test rig has been constructed and developed wherein the heated air is recycled to the counterflow heat exchanger. The lengths of both the evaporator section and the condenser section of the heat exchangers were 300 mm and the central adiabatic section was 150 mm. The heat exchangers which were tested used (1) continuous plate finned copper tubes, (2) circular, spirally-finned steel tubes and (3) bare copper tubes for their respective heat pipes. The working fluid was water with a fill ratio of 60% of the evaporator section length. The air face velocity range was from 1.5 to 5 m/s and the heat input into the evaporator section inlet was varied between 4 and 20 kW using electric heating elements. The heat exchangers showed high effectiveness compared with similar heat exchangers using other working fluids, such as Freon 22 (R22). The rectangular plate finned copper thermosyphon heat exchanger had the best performance but there was a limitation on testing this configuration that the adiabatic section temperature operating condition did not exceed 200°C, in order not to exceed the safe working pressure. A steel pipe heat exchanger will be used in the industrial application to which the project is directed. This heat exchanger has been designed, manufactured and tested for heat recovery in industry with medium temperatures (lower than 300°C), for example in bakeries to recover flue gas energy from the oven to heat up the proofing oven or other low temperature heating functions.
64 citations
TL;DR: In this paper, an analysis of the thermal performance of a heatpipe heat exchanger based on the effectiveness-NTU model is developed, and the predicted thermal performance using this model is compared with results obtained by previous investigators.
18 citations