Difference between revisions of "DIY Heat Bank"
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This article is about making a [[DHW]] [[Thermal Stores and Heat Banks|Heat Bank]] using readily-available separate components. | This article is about making a [[DHW]] [[Thermal Stores and Heat Banks|Heat Bank]] using readily-available separate components. | ||
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− | + | |[[Image:DIY_heat_bank_diagram.jpg|480px]] | |
There are also a mains feed via ball-float fill valve and an overflow on the F&E tank which are not shown in the diagram. | There are also a mains feed via ball-float fill valve and an overflow on the F&E tank which are not shown in the diagram. | ||
+ | |[[Image:DIY_Heat_Bank_DHW_secondary_components.jpg|480px]] | ||
+ | DHW secondary components assembled ready to install (remotely from cylinder). A service isolation valve and in-line 'Y' strainer are visible in the mains water inlet (bottom right) which are not shown in the diagram. The electrical connections to the pump and flow switch, and the triac electronics are not shown in this photograph. | ||
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== Components == | == Components == |
Revision as of 14:47, 17 March 2007
This article is about making a DHW Heat Bank using readily-available separate components.
Components
Normal Y-plan (or S-plan, W-plan etc) vented CH+DHW system with
- Direct HW cylinder
- Pump (standard 15/50 CH circulator type)
- Plate Heat Exchanger (PHE)
- Thermostatic Mixing Valve (TMV) 22mm
- Flow switch wired to switch on pump when flow is detected
PHE
From:
GEA-Ecoflex Unit 8, Waterside Business Park Redwall Close Dinnington-Sheffield S25 3QA Tel.: +44-(0)1909 551 107 Fax: +44-(0)1909 550 885 e-mail: info.uk@gea-ecoflex.com
Copper brazed plate heat exchanger model:- BP12M-20-G1G1
Spec
Compact gasket-free Brazed Plate Heat Exchanger consisting of corrugated pressed stainles steel plates (1.4401), which are brazed together with copper in a special vacuum process. Designed, produced and tested in sites with quality systems in accordance with DIN ISO 9002 requirements. Pressure-Vessel Approval according TÜV and EC Pressure-Equipment-Directive (CE).
Specification for 1 x M12-20-GG | ||||
---|---|---|---|---|
Operational data: | Side A | Side B | ||
Media: | Water | Water | ||
Condition: | liquid | liquid | ||
Heat exchanged: | 50 | kW | ||
Mass flow: | ||||
Volume flow: | 0.64 | 0.24 | l/s | |
Temperature inlet: | 82 | 10 | °C | |
Temperature outlet: | 63 | 60 | °C | |
Pressure drop: | 29.65 | 3.91 | kPa | |
Surface margin: | 1.49 | % | ||
Content: | 0.5 | l | ||
Heat transfer area: | 0.22 | m² | ||
Design pressure: | 30 | bar | ||
Design temperature: | 200 | °C |
Flow Switch
Farnell order code 730890 Manufacturer Part Number FS22 FLOW SWITCH, 22MM 3.75 L/MIN; Switch Poi £11.60 + VAT & p&p
This is a reed-switch whose contacts are rated 15VA, max 1A AC, into resistive loads.
The pump is rated 82W, 0.36A @ 230V AC but is an inductive load so to be on the safe side the circuit shown is used to drive it:
----------+--- LIVE 240V AC | | | 100R | | ------- === 0.1uF | PUMP | | 600VDC ------- | +---------- 100R | --/\/\-------+--------------- | ------------ | FLOW \ | MT2 | | SW o | | ----- | | TRIAC | | MOV | ------| G | ----- | MT1 | | ------------ | |--------------- | -------------- NEUTRAL Triac: BTA16 600B (Maplin) MOV 250V AC (Maplin) Resistors 1W Components wired up on strip of chock-block