FORM 2
THE PATENTS ACT, 1970
(Act 39 of 1970)
COMPLETE SPECIFICATION
(See Section 10)
Title: "A process and a device for efficient cooling of wort in
breweries"
Name: Chem Process Systems Pvt. Ltd.
Address: 15, Natraj Industrial Estate, Sanand-Viramgam Highway,
Taluka: Sanand, District: Ahmedabad-382170, State: Gujarat, India.
Nationality: Indian
The following specification describes the nature of the invention and the manner in which it is to be performed:

FIELD OF THE PRESENT INVENTION
The present invention relates to a process and a device for cooling of wort in the breweries. More particularly, the present invention relates to a process and a device for cooling of brewing liquor (wort) using chilled process water or direct cooling with suitable primary or secondary refrigerant streams.
BACKGROUND OF THE PRESENT INVENTION
Two-stage or multi-stage cooling of brewing liquor (wort) is known from the prior art. Under these circumstances, the brewing liquor (wort) coming from the wort copper is cooled in. a suitably dimensioned cooler, in a first stage, with cold process water in a range between about 10°C and 35°C, to a temperature about 3°C to 20°C above the inlet temperature of the brewing liquor. The process water in turn gets heated to desired temperature. In a second stage, wort is further cooled down to the desired pitching temperature via a suitable refrigeration-carrier medium which has been cooled in a central compression or vapour absorption refrigeration device to the working temperature, which lies suitably below the pitching temperature. The carrying medium could be the refrigerant itself in direct expansion type chillers or secondary refrigerant such as glycol or even chilled process water which has been generated in the refrigeration system.
US5787720 dated January 26, 1996 in the name of Bernhard Lenz has disclosed a method and a device for cooling of brewing liquor using a refrigeration device. The said refrigeration device being designed as an absorption-type refrigeration device, and preferably as a LiBr absorption-type refrigeration device. With an evaporator, an absorber, a generator and a condenser, and the generator being operated with surplus process heat produced in the brewery. Use is preferably, made of the water vapour heat which is recovered in the copper vapour

condenser and which can be subjected to intermediate storage in an energy reservoir.
In the recent times, two-stage wort cooling has been replaced by single-stage process. In this process brewing liquor it continuously cooled to a temperature of about 2°C to 4°C below the pitching temperature by means of chilled process water, which in turn is generated in a conventional compression or vapour absorption refrigeration device. The chilling is carried out in suitably sized heat exchanger unit with one or more wort coolers predominantly of Plate and Frame Heat Exchangers type. The quantity of chilled process water used for cooling the wort varies between 1 to 1.2 times the quantity of Peer wort which is cooled. The temperature of hat process. water generated in the wort cooler varies between 80°C to 95°C. However, predominantly brewers maintain a temperature of hot process water between 79°C to 82°C at which temperature water is required for mashing and lautering.
Recently Brewing industry has adopted a process wherein drawing of hot process water at higher temperatures i.e. 88°C to 95°C is carried out by adding more surface area in wort coolers and inject process water at ambient temperature i.e. 15°C to 35°C through inline mixers or directly in the process water tank. The temperature in process water is thereby maintained at desired level around 80°C. the surface area of wort coolers has been increased either by adding plates to existing wort coolers or by adding new heat exchange units in series with existing wort coolers. This modification enables a reduction in quantity of chilled water.
Each of the above prior art suffers from one or more disadvantages like higher refrigeration load for cooling the brewing liquor, lower quantity of hot process water generated from wort coolef which results in higher consumption of steam or larger heat exchanger area required for wort

coolers. Thus, there is a long felt need to provide a process and a device for cooling of wort which is considered as advantageous over the prior art processes.
Adopting these prior arts as the starting point, the object of the present invention is to provide a method and a device for wort cooling wherein less quantity of chilled water is required for wort cooling as well as increasing the temperature at which chilled process water has to be made available. Both of these measures significantly reduce the energy consumption in the refrigeration system. Another beneficial result from the invention is an increase in the quantity of hot process water available from the wort cooler thereby reducing the requirement for steam. This object is achieved through a process and through a device as described herein.
OBJECTS OF THE PRESENT INVENTION
The main object of the present invention is to obviate the problems in the said prior art.
It is an object of the present invention to provide an efficient, cost-effective, safe and industrially applicable process for cooling of wort in breweries.
Another object of the present invention is to provide a device for cooling of wort in breweries which is simple in construction and easy 8B convenient to operate.
It is further an object of the present invention to provide a process and a device for reducing the quantity of chilled water required for cooling of brewing liquor (wort) as well as increasing the temperature at which chilled process water has to be made available for cooling of brewing liquor.

Another object of this process is to increase the quantity of hot process water which is generated in wort cooler.
BRIEF DESCRIPTION OF DRAWINGS
Figure-1 shows a schematic diagram of "plate heat exchanger". Figure-2 shows a schematic diagram of wort cooling device using two "Plate heat exchangers".
Figure-3 shows a schematic diagram of wort cooling device using single "plate heat exchanger".
DETAILED DESCRIPTION OF THE PRESENT INVENTION
Accordingly, the present invention relates to a method and a device for wort cooling wherein less quantity of chilled water is required for wort cooling as well as increasing the temperature at which chilled process water has to be made available. Both of these measures significantly reduce the energy consumption in the refrigeration system. Another beneficial result from the invention is an increase in the quantity of hot water available from the wort cooler there by reducing the requirement for steam.
According to one of the embodiments of the present invention, Figure-2 shows a schematic diagram of wort cooling device using two "plate heat exchangers".
A device for cooling of wort using two "plate heat exchangers" comprising:
Two "plate heat exchangers",
means for connecting the "plate heat exchangers",
means for transporting raw water through the "plate heat
exchangers",
means for transporting chilled water through the "plate heat
exchangers",

means for transporting hot wort through the "plate heat exchangers" to get cold wort.
Figure-1 shows schematic diagram of the conventional plate heat exchanger.
There are two "plate heat exchangers" (1) & (2) provided. The plates inside the said heat exchangers (1) & (2) are arranged in two sets. Means for transporting is a pipeline and that is fitted as per the requirement. Heat exchangers (1) & (2) are connected through pipeline. Chilled water is injected from the one side of the heat exchanger (2b) through the inlet pipeline. Further, inlet pipeline for injecting raw water is provided between the said heat exchangers (1) 85 (2), the said pipeline is connected with cold process water pipeline and makes possible for mixing the raw water with cold process water. The said process water is circulated in counter current direction through the means for transportation i.e. pipeline, passed through the plates of the heat exchangers (1) & (2) and converted and collected as a hot water from heat exchanger outlet (2b') which can be utilized further for many other applications for example: hot water needed for mashing and lautering of wort, in pasteurization of beer, in washing and cleaning the kettles etc.
Simultaneously, from the other side of the heat exchanger (la), there is inlet pipeline provided for injecting hot wort which is passed through the plates of the heat exchangers (1) & (2) to get the cold wort from the heat exchanger outlet (2a').
The sizes of two heat exchangers (1) & (2) are selected in such a manner so that minimum possible temperature difference is maintained between desired final exit temperature of cold wort which is between 4°C to 18°C and the inlet temperature of chilled water which is below 10°C.

The surface area of each "plate heat exchanger' is inversely proportional to log-mean temperature difference between the hot and cold water stream which in turn depends on the ratio of flow rates of hot and cold water stream. For the same outlet temperature of wort, the surface area required for the "plate heat exchanger" would be lowest if the flow rate of cold process water is highest.
Optionally, there is a pressure gauge (PG) fitted to each inlet-outlet pipe line so that the pressure of hot stream and cold stream of water and wort can be measured. In a similar manner, temperature indicator (TI) is fitted to each inlet-outlet pipeline so that the temperature of hot stream and cold stream of water and wort can be measured.
Pipes used in a device are made of any material used in transporting the liquid chemicals in chemical industry.
In another embodiment, a process of cooling of wort using the said
device is provided wherein a process comprises of:
providing "plate heat exchangers" (1) & (2) and connecting them through
the pipeline,
transporting raw water and chilled water through the heat exchangers
(1) and (2) and mixing it together to get the hot water,
transporting hot wort through the heat exchangers (1) & (2) to get cold
wort.
According to the process, Chilled water is transported continuously through the inlet of heat exchanger (2b). Simultaneously, hot wort is transported through the inlet of heat exchanger (la). Temperature of chilled water is maintained between 5°C to 10°C. The flowrate of chilled water transported through- the heat exchanger (2b) is maintained between 0.95 to 1.1 times the flowrate of wort. Means for mixing the raw water with chilled water pipeline between the said heat exchangers (1) &

(2) is provided that makes possible for mixing the raw water with cold" process water. The temperature range of process water comes out from the heat exchanger (2) may vary between 15°C to 35°c.
The said process water is circulated in counter current, direction through the means for transportation i.e. pipeline, passed through the plates of the heat exchangers (1) & (2) and converted and collected as a hot water from heat exchanger outlet (2b'). Simultaneously, hot wort is circulated in counter current direction through the means for transportation i.e. pipeline, passed through the plates of the heat exchangers (1) & (2) and converted into cold wort from heat exchanger outlet (la'). This cold wort may be further taken for fermentation process in breweries industries.
The quantity of raw water is adjusted manually or automatically such that the final exit temperature of process water is maintained as desired temperature between 80°C-95°C.
The ratio between amount of cold water required to bring hot water to a desired temperature depends on the ratio between difference inlet and outlet temperatures of hot and cold water. For- example, if hot wort has to be cooled from 97°C to below 10°C and cold process water has to be heated from 3°C to 80°C, the quantity of chilled process water required to cool wort will be 1.007 times the quantity of wort.
Increasing the temperature at which chilling has to be carried out by 1°C results in energy saving to the tune of 3% in any conventional compressor based chillers.
According to another preferred embodiments it is also possible to accommodate the above process of wort cooling in a single "plate heat exchanger" frame.

Figure-3 shows a schematic diagram of wort cooling device using single "plate heat exchanger".
A device of wort cooling in a single plate heat exchanger comprising:
Single "plate heat exchanger",
a mixing nozzle for mixing raw water into chilled water to form process
water
means for transporting chilled water from heat exchanger inlet (lb) to
(lb') in a counter current direction to get hot water,
means for transporting hot wort from heat exchanger inlet (la) to (la') in
a counter current direction to get cold wort.
Further, a process of wort cooling in a single plate heat exchanger is also provided. The major difference between the process using two plate heat exchangers and single heat exchanger is the mixing nozzle (6) in Fig-1 and Fig-3) for mixing the raw water into the chilled water to form process water otherwise the other requirements are similar to the process described in the process of wort cooling using two plate heat exchangers.
It is to be noted that above description is not intended to limit the scope of the present invention and the improvements in the present invention by carrying out some minor changes done by the person who is skilled in the art, after filing the said patent application, will be considered as part of the present invention.
ADVANTAGES OF THE PRESENT INVENTION
Now, without limiting the scope of the invention, advantages of the -
present invention may be shown as follows:
1. The required quantity of chilled water is reduced by 2-15% in overall cooling process.

2. The energy consumption for chilled water generation is decreased by 4-20%.
3. Energy cost for refrigeration to generate chilled water is decreased drastically.
4. Quantity of hot process water generated in wort cooler is increased.
5. Less amount of steam is required for brewing process because of increase in quantity of hot water in wort cooler.

We claim:
1. A device for cooling of wort using two "plate heat exchangers"
comprises of:
Two "plate heat exchangers",
means for connecting the "plate heat exchangers",
means for transporting raw water through the "plate heat
exchangers",
means for transporting chilled water through the "plate heat
exchangers",
means for transporting hot wort through the "plate heat
exchangers" to get cold wort.
2. A device as claimed in claim-1 where in means for connecting the "plate heat exchangers" is a pipeline.
3. A device as claimed in claim-1 wherein means for transporting raw water is a pipeline fitted with the pipeline of two "plate heat exchangers".
4. A device as claimed in claim-1 wherein means for transporting chilled water is a pipeline fitted with, two "plate heat exchangers".
5. A device as claimed in claim-1 wherein means for transporting hot wort is a pipeline fitted with two "plate heat exchangers".
6. A device as claimed in claim-1 is a device as disclosed in figure-2 of the specification.
7. A process of cooling of wort using two "plate heat exchangers" comprises of:
providing "plate heat exchangers" (1) & (2) and connecting
them through the pipeline,
transporting raw water and chilled water through the heat
exchangers (1) and (2) and mixing it together to get the hot
water,
transporting hot wort through the heat exchangers (1) & (2) to
get cold wort.

8. A device of wort cooling in a single plate heat exchanger may
be described as follows:
single plate heat exchanger,
A mixing nozzle (6) for mixing raw water into chilled water to
form process water
Means for transporting chilled water from heat exchanger inlet
(lb) to (lb') in a counter current direction to get hot water,
Means for transporting hot wort from heat exchanger inlet (la)
to (la') in a counter current direction to get cold wort.
9. A device as claimed in claim-8 wherein mixing nozzle (6) is connected with the means of transporting chilled water.
10. A device as claimed in claim-8 wherein means for transporting chilled water is a pipeline fitted with single "plate heat exchanger".
11. A device as claimed in claim-8 wherein means for transporting hot wort is a pipeline fitted with single "plate heat exchanger".
12. A device as claimed in claim-8 is a device as disclosed in figure-3 of the specification.