Heat Pumps: Some options for using advanced/compact heat exchangers. David Reay David Reay & Associates

Transcription

1 Heat Pumps: Some options for using advanced/compact heat exchangers David Reay David Reay & Associates

2 Scope of Presentation Setting the scene why are we interested? Inventory, multiple heat sources, size & cost Re-engineering the package Compact hx configurations Heat storage Absorption/adsorption as well as vapour compression Additive manufacturing Integration of hx and compressor etc.

3 Why are we interested? A zero carbon home is one where the CO2 emissions from regulated energy use (space heating, hot water, lighting, ventilation) are reduced to zero by a combination of factors. Legislation means all new-build houses should be zero carbon in about 4 years time. Heat pumps help towards this. they need to be cost-effective. But

4 One energy-efficient domestic heating system a multi-source heat pump

5 Ray Gluckman s data on working fluid/safety cost is a good reason to reduce inventories

6 The Chart unit area density Chemical reactor types (or heat exchangers) Normal plate-fin surfaces

7 We can re-engineer packages & make them smaller

8 Just to remind you of Rotex

9 Little & LARGE

10 LARGER.100 kw Absorption Cycle Unit It is a prototype, but still rather large.

11 And small again (by Garimella in the USA)

12 ..And again JEH/DAR/Absotech Using this surface This 100 kw unit became this: 1m x 0.55m x0.2m

13 The heat transfer surface is the key This morphed into this:

14 Precision Micro now part of Meggitt Laser-evolved etching (microchannels in plates from 0.01 mm thick, photochemical machining PHE plates 1.5 mm thick)

15 ERG Aerospace Adsorption Unit Foam packed with adsorbing powder for solar aircon unit BUT use with a PCM for heat storage

16 TWI, Cambridge Electron beam-sculpted surfaces Dimension scale = 1 mm

17 Some more compact surfaces Highflux

18 Additive manufacturing (AM) a game-changer? Already heard about it in the context of heat pipes Sciaky Inc. in US makes aerospace components to 5mx1mx1m using EB AM finished by tidying up with some surface machining Drummond Hislop (HiETA) will tell us about AM tomorrow

19 An example of an AM heat exchanger HX from Within labs. Scale unimportant but detail is.

20 Another example of 3D printing A section of a heat exchanger courtesy HiETA

21 And one that Amir may mention Spirax-Sarco PHE demo via 3D printing

22 A Bonus from PI Multi-functional Capability This is a heat exchanger-reactor, but it could equally be an integrated absorber /generator/heat exchanger

23 Could help us to integrate the compressor into the heat exchanger Concept of Dr. Kew at Heriot-Watt. Uses PCHE technology

24 Kew concept performance This is a water-water heat pump employing a rotary vane compressor embedded in a printed circuit-type heat exchanger. The unit shown was designed to operate using R134a with evaporating and condensing temperatures of 4 o C and 60 o C respectively, an output of 3 kw and a COP of 3. The unit (excluding water-side headers, water pumps and compressor motor) would occupy a block 25 mm x 700 mm x 200 mm, or m 3.

25 One energy-efficient domestic heating system a multi-source heat pump

26 What now? Think integration unit operations Think intensification multi-functional unit operations Think technology transfer Think how to successfully commercialise the product/process Think small But think big

27 Acknowledgements (Pin-fin) (Electron beam surfaces) (3D printed hx) (3D printed hx) (Photochemical etching) (Foam heat exchangers etc.) (Process intensification network) (Heat exchanger network)

28 Finally... Thank you very much!