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Scientists use Carbon dating for telling the age of an old object, whose origin and age . We know for a fact that the amount of Carbon in the atmosphere has not.

He suggested running a couple of flexible ducts to that main living room to "assist" the baseboard. But I got to thinking, now that the temps. I wonder if you put the baseboard first will they rob enough heat so that the air will be too cool?

Heat Exchanger Hook-up in Firewood and Wood Heating

Here is the thread http: Life is what you make it! Not sure about the hookup on that but when I sold and installed similar untis often times more than 1 zone was called for. This can be done a couple of different ways. You will need a thermostat for each zone. You can split the flow in a manifold and have a pump for each or you can use 1 pump and zone valves. You will need check valves to make sure the hot water comes from the boiler and not back fed from another zone.

Either way will give you fully hot water to each.

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You may need a bigger pump if the flow is not great enough because you likely don't want to add a new line from the boiler. If you just go through the baseboards first you may starve the heat exchanger for needed BTU's and will get cool drafts in the house. These answers certainly help my conversations with my plumbers. They're good guys, and they know what they're doing, but every system is different, so I like to at least ask them intelligent questions.

I think it makes me and them a little smarter about my particular system. Of course, OWB's are not their specialty, so I like to make sure they're not making any wrong assumptions, etc.

It does seem to me that my goal should be to send degree water to EACH system baseboard and hot air , but the fact that they share the same boiler may make that impossible? I just noticed your edit. When I looked at the diagram, I couldn't really tell, so thanks for taking another look!

Just a thought here You will loose some heat in the exchange, so it would seem logical to increase OWB temp until you get the correct temp on the 'house side'? Spiker- CB recommends running the e-Classics at and the controller at least mine will not go above If I wanted on the house side of the plate exchanger, I'd try at least. The Forestry Forum is sponsored in part by: Forestry Forum Sponsored by: December 09, , Tim Logged beenthere Senior Member x2 Posts: Logged Just call me the midget doctor.

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Adding plate heat exchanger to electric DHW tank

Tim Logged irallen member Posts: Logged Tim Crowley member Posts: Logged woodmills1 Senior Member x2 Posts: December 11, , Tim Logged Tim Crowley member Posts: Tim Logged ken Full Member x2 Posts: December 15, , Flow rate will only help some, the water has to stay in long enough to actually pass the heat to the rest of the system. There is a calculation for heat exchangers that tells you how long the air has to stay in the exchanger to pick up the heat form the water.

Cant remember if this was over a water to air exchanger or water to water? In either way the baseboards will need the higher temp water as the water to air heat transfer is much less than what it is for the heat exchanger be it water to water or water to air as the heat exchanger has forced heat transfer dynamics.

Sidearm Heat Exchanger - Installation

The baseboard units if not powered are depending on convection heating to pull cool air in at bottom and warm air out the top Logged Send this topic Print Pages: April 21, , November 17, , Heat exchanger needed for OWB? January 10, , To maintain operational effectiveness, the dismantling and cleaning of gasketed PHEs is often scheduled as part of an annual maintenance plan. Gaskets on large PHEs are costly to replace, and in-situ maintenance must ensure that the plates are evenly loaded, and kept square and flat — by methodically tightening the bolts to an appropriate torque to secure the pressure plate — to ensure longevity of successful operation.

Chemical or ultrasonic cleaning may be required to remove dirt and debris in brazed PHEs after a period of operation. This can be done in situ, if appropriate valve arrangements have been installed. Applications of PHEs in building heating systems. PHEs are already commonplace in a number of applications in building systems. They are most often found in combination boilers, where brazed PHEs are used to divert heat from the primary heating circuit to the instantaneous flow of domestic hot water.

In commercial continuous flow heating and hot water systems, PHE primaries can be fed from low-, medium- or high-temperature heat sources, including steam. They also form the core of the heat interface unit HIU , as used for district heating schemes to supply heat to end users. They are increasingly applied to refurbishment projects where, throughout the life of the system, there will be degradation of the pipework and fittings that will cause particulate matter and limescale calcium carbonate to accumulate within the system.


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Methods are available to remove particulate matter — such as filters, cyclone-type separators and magnetic sludge removers — but, on an older system, it is particularly challenging to ensure the absence of all particulate matter, even after undertaking a comprehensive cleaning and flushing operation.

The resulting boiler performance can be affected. Older cast-iron boilers with large waterways are less susceptible, and could often cope with such conditions where particulate matter could accumulate at the bottom of the channels without causing a major obstruction. Newer, high-efficiency boilers have smaller waterways, so there is less room within the system for dirt and debris to collect without adversely affecting performance.

Condensing boilers are generally installed as part of a sealed, pressurised system, but many older, open-vented systems are not suitable for conversion to sealed operation. A practical solution is to leave the existing secondary system open-vented, while hydraulically decoupling the primary circuit using a PHE, to provide a protected, pressurised primary circuit for the new boiler. The PHE would typically replace the traditional low-loss header, the principal function of which is hydraulically to separate the primary and secondary circuits, as shown in Figure 4.

It is important that the heat exchanger is sized correctly, not only to supply the required heat to the secondary circuit, but also to ensure that the hydraulic resistance can be accommodated by the primary and the secondary system pumps. This compares with less than 10Pa in a low-loss header. The PHE cannot, of course, increase the temperature of the secondary flow above that of the primary.

However, the temperature of the secondary flow can reach to within 2K and 5K of that of the primary flow. In practice, the resulting reduced secondary-water mean temperature — compared with that of the original system design — does not cause problems in normal operation, as many old systems and their heat emitters are oversized, or buildings have undergone some refurbishment, so reducing the heating load from that when the building was originally built. Separating the primary and secondary circuits will mean that, during boiler maintenance, the requirement for draining down will be reduced, and the volumes of replacement, treated make-up water will be lower for the pressurised system, making maintenance simpler, quicker and less costly.

The recommissioning of the pressurised system will also be completed more swiftly, as there will be less risk of air being introduced to the system because of the smaller system pipe network. Properly applied and installed, PHEs can ease the integration and ensure effective operation of new boilers with existing systems.

Using the PHE to decouple new high-efficiency pressurised boilers from the main distribution system can protect new boilers from the contamination likely to exist in legacy systems. This also allows the existing pipework infrastructure to remain in place, creating the opportunity for staged refurbishment while keeping the primary heat source in operation. Removing the boiler from the main distribution system will allow more control over the water quality circulating in the boilers, so improving boiler life-cycle operational efficiency, reducing maintenance and potential breakdowns, and maximising useful life.

The use of PHEs in commercial heating systems is reportedly growing 3 as awareness about potential applications and benefits increases.


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