Heat Exchangers for Cardioplegia Systems: In Vitro Study of Four Different Concepts

Drummond, Mário; Novello, Waldyr Parorali; Arruda, Antônio Celso Fonseca de; Braile, Domingo Marcolino

doi:10.1046/j.1525-1594.2003.07240.x

“…where T BO is the temperature at the tube outlet, T BI is the temperature at the tube inlet and T WI is the temperature of the water at the shell inlet. The values of R are in range 0-1, where 1 corresponds to ideal heat exchanger [4], [7].…”

Section: Methodsmentioning

confidence: 99%

“…Although the manufacturers provide some basic information on the conditions under which the HEs should be operated, the thermal specifications are rarely listed. The studies on this topic has been given in [3], [7], [8] or [9] but the HEs evaluated in these studies are outdated and no longer used.…”

Section: Introductionmentioning

confidence: 99%

Cardioplegia heat exchangers thermal properties

Bartuli¹,

Borkovec²

2020

AMS

2

0

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Cardiac surgeries that involve cardiopulmonary bypass technique require a stable temperature maintenance for oxygenated blood or the cardioplegia solution. For this purpose, the heat exchangers are used. Nowadays, these exchangers consist of stainless steel tubes or bellows in a plastic shell. The blood is then warmed or cooled by water flowing in the shell around these structures. In the paper, the thermal specifications of two commercially used cardioplegia heat exchangers Capiox Cardioplegia and MYOtherm XP were evaluated and compared. For this purpose, a water was used as a substitution for blood. Both components were tested for varying flow rates in the pipes in the range 20-150 l/h and fixed flow rate 700 l/h in the shell. The thermal performances of both devices resulted similarly (up to 2.4 kW) at maximal flow rate. The performance factors for low flow rates approached values close to 0.98 and with increasing flow rate decreased down to 0.50. MYOtherm XP shows lower pressure drop than Capiox Cardioplegia due to more optimal construction. The major difference between the heat exchangers was observed in overall heat transfer coefficients at maximal flow rate and resulted in 2191.3 W/m 2 K or 1760.2 W/m 2 K for MYOtherm XP or Capiox Cardioplegia, respectively.

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“…Mario Drummond et al of the University of Campinas (Campinas, SP, Brazil) evaluated different types of heat exchangers for cardioplegia systems. They noted that the bellows type offered advantages (23).…”

Section: Artificial Hearts Ventricular Assist Devices and Rotary Blmentioning

confidence: 99%

Artificial Organs 2003: A Year in Review

Malchesky¹

2004

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“…Although the manufacturers provide some basic information on the conditions under which the HEs should be operated, the thermal specifications are rarely listed. The studies on this topic has been given in (Bethune et al, 1975), (Drummond et al, 2003), (Patel et al, 1995) or (Segers et al, 2001) but the HEs evaluated in these studies are outdated and no longer used.…”

Section: Introductionmentioning

confidence: 99%

Thermal Properties of Cardioplegia Heat Exchangers

Borkovec¹,

Bartuli²

2020

Engineering Mechanics 2020

0

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Cardiac surgeries that involve cardiopulmonary bypass technique require a stable temperature maintenance for oxygenated blood or the cardioplegia solution. For this purpose, the heat exchangers are used. Nowadays, these exchangers consist of stainless steel tubes or bellows in a plastic shell. The blood is then warmed or cooled by water flowing in the shell around these structures. In the paper, the thermal specifications of two commercially used cardioplegia heat exchangers Capiox Cardioplegia and MYOtherm XP were evaluated and compared. For this purpose, a water was used as a substitution for blood. Both components were tested for varying flow rates in the pipes in the range 20-150 l/h and fixed flow rate 700 l/h in the shell. The thermal performances of both devices resulted similarly (up to 2.4 kW) at maximal flow rate. The performance factors for low flow rates approached values close to 0.98 and with increasing flow rate decreased down to 0.50. MYOtherm XP shows lower pressure drop than Capiox Cardioplegia due to more optimal construction. The major difference between the heat exchangers was observed in overall heat transfer coefficients at maximal flow rate and resulted in 2191.3 W/m 2 K or 1760.2 W/m 2 K for MYOtherm XP or Capiox Cardioplegia, respectively.

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Heat Exchangers for Cardioplegia Systems: In Vitro Study of Four Different Concepts

Cited by 4 publications

References 4 publications

Cardioplegia heat exchangers thermal properties

Cardioplegia heat exchangers thermal properties

Artificial Organs 2003: A Year in Review

Thermal Properties of Cardioplegia Heat Exchangers

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