This section describes five energy-saving applications that use plate heat exchangers, as well as examples of how they can be combined to save energy.
How much is the cost of energy ?
How to know the amount of annual benefit when recovering
the heat as a hot water, 30m3/h and 50°C heated up (20°C -> 70°C).
- 1. In Fig.1, find the cross point between horizontal line extending from 50°C and flow rate curve of 50m3/h (green curve).
- 2. Extend the line further down from the cross point, you can see the value 1,750kW on horizontal axis "Recovered Heat (kW)".
- 3. Extend the line down to the 3k line (purple line) in Figure 2, you will find a monthly energy saving 12,500,000JPY/month on vertical axis "Energy Saving".
ASSUMPTIONS
Operating hour : 720hr/month (≒24h x 30days)
3k steam : 6,000JPY/ton
Electricity : 28JPY/kWh
Chiller : 11JPYkWh (COP5)
Click the 5 icons
- Find the heat recovery loop that is shaped like the symbol for infinity (∞).
- Use a heat source with a similar temperature to improve efficiency! Find the best heating/cooling source
- Use the heat (latent heat) of steam
- Review temperature conditions and change operating conditions
- Think outside the box to aim for the best solution
Food and Beverage Products
Sterilization System
Process overview
Heat it up to certain temperature and hold it to sterilize for a period (usually a few seconds to a minute). After that, it goes to be cooled down. Not only for the beverage, milk, milk product, soya sauce, liquid sugar, alcohol and any other liquor has also the same application.
- Improvement effect
- Plate heat exchanger is able to combine multiple units into one unit. In the food and beverage industries, it is commonly applied. Installing an additional heat recovery section, steam and cooling water can be reduced consequently in this case.
Wort pan vapor recovery
Process overview
When the crushed malt germinated wheat comes to the hot water, an enzyme is activated and the fermentation, which starch in the malt is decompose into the sugar, starts. Adding the hop and boiling it up together, the wort is born. While boiling the wort, the wort pan vapor comes from the top of the wort pan.
- Improvement effect
- The wort pan vapor contains the water vapor partially. During the condensation, changing its phase from gas to liquid, huge amount of the heat is released. There is no doubt to be worth to recover its heat. Sometimes, shell and tube heat exchanger can be seen for this application. However replacing it by PHE maximizes the temperature of the hot water, Besides, light weight, compact size and easy maintenance are additional benefit.
