The use of a double heat pipe heat exchanger system for reducing energy consumption of treating ventilation air in an operating theatre—A full year energy consumption model simulation

Yau, Yat Huang

doi:10.1016/j.enbuild.2007.07.006

Cited by 67 publications

(39 citation statements)

References 2 publications

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“…The advantages of thermosyphon heat exchangers over conventional heat exchangers include a good flow separation, no additional power input to the system, high reliability [12;17;33;34], lower initial investment and operating costs [16;35], the ability to work at lower temperature differences [35] and a contingency plan -if a pipe or number of pipes were to fail, the heat exchanger would remain operational [16;20]. Their application is not limited to waste heat recovery in the industrial domain; in fact, heat pipe technology utilisation has spread to ventilation and air conditioning [13;16;21;33;36-38], solar collectors [39] and even water desalination systems [20].…”

Section: Introductionmentioning

confidence: 99%

Experimental and analytical performance investigation of air to air two phase closed thermosyphon based heat exchangers

Danielewicz

Sayegh

Śniechowska

et al. 2014

Energy

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In recent years, the use of wickless heat pipes (thermosyphons) in heat exchangers has been on the rise, particularly in gas to gas heat recovery applications due to their reliability and the level of contingency they offer compared to conventional heat exchangers. Recent technological advances in the manufacturing processes and production of gravity assisted heat pipes (thermosyphons) have resulted in significant improvements in both quality and cost of industrial heat pipe heat exchangers. This in turn has broadened the potential for their usage in industrial waste heat recovery applications. In this paper, a tool to predict the performance of an air to air thermosyphon based heat exchanger using the ε-NTU method is explored. This tool allows the predetermination of variables such as the overall heat transfer coefficient, effectiveness, pressure drop and heat exchanger duty according to the flow characteristics and the thermosyphons configuration within the heat exchanger. The new tool's predictions were validated experimentally and a good correlation between the theoretical predictions and the experimental data, was observed.

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Section: Introductionmentioning

confidence: 99%

Experimental and analytical performance investigation of air to air two phase closed thermosyphon based heat exchangers

Danielewicz

Sayegh

Śniechowska

et al. 2014

Energy

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“…Energy conservation systems can reduce energy consumption; however the comfort and sterile conditions must not be sacrificed. A study conducted by Yau [9] has strongly recommended that, the application of heat recovery unit in a sterile HVAC system of an OR using in a tropical climate achieves significant energy savings. Yao and Ng [10] compared energy savings and fungus growth control in a tropical OR by using heat recovery devices.…”

Section: Introductionmentioning

confidence: 99%

Economical assessment of different HVAC systems for an operating room: Case study for different Turkish climate regions

Özyoğurtçu

Mobedi

Özerdem

2011

Energy and Buildings

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a b s t r a c tIn this study, the annual energy consumptions of four different heating, ventilation and air conditioning (HVAC) systems serving to operation rooms (ORs) located at five different cities (Izmir, Antalya, Istanbul, Ankara and, Erzurum) in Turkey are analyzed. The study is performed for four different HVAC systems: (a) 100% fresh air system (System I), (b) 100% fresh air with half air volume rate at night period (System II), (c) 100% fresh air with half air volume rate at night period and heat recovery unit (System III), (d) 50% fresh air with half air volume rate at night period and with heat recovery and mixing units (System IV). Life cycle cost (LCC) for 20 years life span is calculated for the considered systems. It is found that System IV considerably reduces energy consumption and it is economically proper for the considered cities. The rate of energy consumption and LCC reductions are greater for the cities with extreme climate condition having relatively low specific humidity ratio. Using System IV instead of System I reduces OR energy consumption by 74% for the city of Erzurum which has a cold and dry climate.

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“…An interesting point regarding the HPHXs operation is that the HPHXs do not require any external power to operate. Literature survey showed that the applications of HPHX to reduce the energy consumption in air conditioning systems have already been investigated [3][4][5][6][7][8][9][10][11][12]. For instance, possible improvement in an air conditioning system performance by application of heat pipe technology was investigated by Naphon [3].…”

Section: Introductionmentioning

confidence: 99%

“…The study revealed the positive e ect of the added air-to-air type HPHX on the air conditioning system in terms of energy recovery and established indoor air conditions. In another attempt, Yau [10] examined a double HPHX con guration in a hospital operating theater to study its e ect on the indoor air conditions and yearly energy consumption. The HPHXs were placed inside the ducting area, and the e ect of added double HPHXs was investigated for a whole year.…”

Section: Introductionmentioning

confidence: 99%

Feasibility study of a water-to-air heat pipe based heat exchanger for cooling load reduction and energy saving in the office buildings: A simulation study

Ahmadzadehtalatapeh

2017

Scientia Iranica

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KEYWORDSEnergy consumption; Water-to-air heat pipe based heat exchanger; Indoor air; TRNSYS.Abstract. In the present investigation, the feasibility of cooling load and power consumption e ect of a water-to-air heat pipe based heat exchanger (HPHX) on an o ce building was studied. An o ce building in Chabahar Maritime University, in southeast region of Iran, which is considered as a high cooling load demanding region, was chosen as the case study. The present research uses the TRNSYS software to investigate the hourly responses of the existing system added with the water-to-air HPHXs in terms of indoor air conditions and monthly power consumption. The e ect of added water-to-air HPHXs on the system was determined, and the results were compared with the existing situation. Water-to-air HPHXs with two, four, and six numbers of rows were examined to recommend the most appropriate con guration for the system. According to the simulation ndings, the existing system with the added six-row water-to-air HPHX is capable of establishing the convenient air into the o ce space. Moreover, it was shown that by implementation of the six-row water-to-air HPHX, a total amount of 3,108.57 kWh power, which is about 42%, could be saved in a year.

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The use of a double heat pipe heat exchanger system for reducing energy consumption of treating ventilation air in an operating theatre—A full year energy consumption model simulation

Cited by 67 publications

References 2 publications

Experimental and analytical performance investigation of air to air two phase closed thermosyphon based heat exchangers

Experimental and analytical performance investigation of air to air two phase closed thermosyphon based heat exchangers

Economical assessment of different HVAC systems for an operating room: Case study for different Turkish climate regions

Feasibility study of a water-to-air heat pipe based heat exchanger for cooling load reduction and energy saving in the office buildings: A simulation study

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