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Interest on a GB for Gord's Heat Exchanger
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<blockquote data-quote="srdigital" data-source="post: 16200106" data-attributes="member: 193457"><p>here's what Gord emailed me:</p><p></p><ul> <li data-xf-list-type="ul">So, option B is available as a dual-pass design? Would you recommend this over single pass?</li> </ul><p></p><p>We will do a dual pass if the customer really wants it. The dual pass can offer some advantage if part of the HE unit is shielded behind the bumper as in the large GT500 units and if you have sufficient flow channels to accommodate and not impede the flow volume through the HE. Also for tall units such as a full size radiator where it helps to even the flow and minimize stratification of the flows. In the case of the 03/04 Cobra HE’s that are below the front bumper level the dual pass actually is less efficient than a single pass. There is greater flow resistance since the flows must squeeze through the top half first with ½ the flow path area and then back through the bottom half again with half the flow path area. This will result in higher velocity but less volume. Also there is heat transfer from the top hot half into the end tanks and along the top of the bottom half. The end tank on the inlet and outlet end is divided by an aluminum plate and the outlet coolant will be reheated by the hot side above, from the incoming fluid. So we strongly recommend a single pass for the 03/04 Cobra HE units.</p><p></p><p></p><ul> <li data-xf-list-type="ul">What is the surface area difference between the option B unit and a GT500 heat exchanger? </li> </ul><p></p><p>Answered in the previous email.</p><p></p><p></p><ul> <li data-xf-list-type="ul">Surface area aside, what are your thoughts on your units single-pass vs dual-pass? My understanding is that higher flow rates are ideal – wouldn’t a dual pass have a higher fluid velocity vs a single? Is this velocity difference offset by the larger surface area of your unit?</li> </ul><p></p><p>Mainly answered above. Yes there is higher velocity but less flow volume. With the single pass there is sufficient velocity to create some turbulence in the flow through the tubes but a higher flow volume. Our HE’s feature larger end tanks than the competitors also which helps in increasing the system volume and helps to decrease any stratification in the flow to equalize flows through all the tubes.</p><p></p><p></p><ul> <li data-xf-list-type="ul">Also, in regards to ‘the monster’ – does this unit require modification of the car in order to mount? I understand you are still working out the kinks . . .</li> </ul><p></p><p>It will require two 0r three holes drilled and some Rivet- nut inserts installed in the bottom of the front bumper beam on each end and some re-shaping of the small support tube that runs up from the radiator front shell to the hood latch plate. Will also require temporarily removing the front bumper cover. I got sidetracked with my GT40 project and my GT500 but am getting back to the 03 Cobra now.</p></blockquote><p></p>
[QUOTE="srdigital, post: 16200106, member: 193457"] here's what Gord emailed me: [LIST] [*]So, option B is available as a dual-pass design? Would you recommend this over single pass? [/LIST] We will do a dual pass if the customer really wants it. The dual pass can offer some advantage if part of the HE unit is shielded behind the bumper as in the large GT500 units and if you have sufficient flow channels to accommodate and not impede the flow volume through the HE. Also for tall units such as a full size radiator where it helps to even the flow and minimize stratification of the flows. In the case of the 03/04 Cobra HE’s that are below the front bumper level the dual pass actually is less efficient than a single pass. There is greater flow resistance since the flows must squeeze through the top half first with ½ the flow path area and then back through the bottom half again with half the flow path area. This will result in higher velocity but less volume. Also there is heat transfer from the top hot half into the end tanks and along the top of the bottom half. The end tank on the inlet and outlet end is divided by an aluminum plate and the outlet coolant will be reheated by the hot side above, from the incoming fluid. So we strongly recommend a single pass for the 03/04 Cobra HE units. [LIST] [*]What is the surface area difference between the option B unit and a GT500 heat exchanger? [/LIST] Answered in the previous email. [LIST] [*]Surface area aside, what are your thoughts on your units single-pass vs dual-pass? My understanding is that higher flow rates are ideal – wouldn’t a dual pass have a higher fluid velocity vs a single? Is this velocity difference offset by the larger surface area of your unit? [/LIST] Mainly answered above. Yes there is higher velocity but less flow volume. With the single pass there is sufficient velocity to create some turbulence in the flow through the tubes but a higher flow volume. Our HE’s feature larger end tanks than the competitors also which helps in increasing the system volume and helps to decrease any stratification in the flow to equalize flows through all the tubes. [LIST] [*]Also, in regards to ‘the monster’ – does this unit require modification of the car in order to mount? I understand you are still working out the kinks . . . [/LIST] It will require two 0r three holes drilled and some Rivet- nut inserts installed in the bottom of the front bumper beam on each end and some re-shaping of the small support tube that runs up from the radiator front shell to the hood latch plate. Will also require temporarily removing the front bumper cover. I got sidetracked with my GT40 project and my GT500 but am getting back to the 03 Cobra now. [/QUOTE]
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