Phase Change Material - PCM Electronic Air Condition..

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General Products       A.C. Backup Phase Change Material      Encapsulation Method of PCM      

Telecom Shelters Phase Change Material      Doctor Says

T-series 18Cto29C: Phase Change Material, PCM Latest^TM 29T Brand with Melting Point 29°C and Latent Heat of fusion 175 KJoule/Kg or 260 KJoule/liter. Its best suited for Air-Condition Back-up to BT Shelter or Telecom Shelter. Other M.P. grades are summarized in the link.

S-series 32Cto48C: Phase Change Material PCM Latest ^TM  36S Brand with Melting Point 36°C and Latent Heat of fusion 260 KJoule/Kg or 357 KJoule/liter. It is best suited for Air-Cooled Telecom Shelters. Other M.P. grades are summarized in the link.

 

Hot Pads and Solar Heating systems use our PCM Latest^TM 58, melting at 58°C. (

Telecom Enclosure:  PCM or Phase Change Material widely used in Telecom Enclosures (BT Shelters) is Latest^TM29T for Air-condition Back-up AC and Latest^TM36S for Free Cooling. We also offer Polymer-based PCM-Filled Profiles Panels and Aluminum PCM-Filled Profiles or any other Container like Balls or Bottles or Heat Sinks and so on. We also supply Telecom Shelters and provide engineering services for Back-up Cooling in Existing and New Shelters. If your interest is only in PCM for Telecom Shelter then go to our Page  Telecom Shelters Phase Change Material and for Air Conditioning visit our page A.C. Backup Phase Change Material.

 

Freezer Salt:  PCM used for maintaining the temperature at 0°C, you get it free; use tap water. Ask us for other target temperatures like 4°C, 7°C, 10°C, 15°C or minus 5°C, minus 30°C and so on.

 

W e cannot help making a negative comment on the products offered by other brands. Most of the brands are offering Thermal salt 29 or PCM 29°C that freezes at less than 18^oC, making them practically useless in tropical regions. The shelf life of some of the vendors is hardly 45-60 day, making its use by long distance importers almost impractical. Most of such vendors are not manufacturer of the major ingredients for the product but only compounder. Often, they are one-man-show manufacturers and quote fancy prices for the product. With the information technology to their aid, they make fancy web sites and manage to squeeze the buyers. We have six manufacturing units, owned and managed by family members and most of the ingredients are manufactured by us.

TECHNO-COMMERCIAL STATEMENT OF PCM PRODUCT T-series Latest™

PCM Energy P. Ltd.	PCM Latest™	PCM Latest™	PCM Latest™	PCM Latest™
Product	Latest™29T	Latest™25T	Latest™20T	Latest™18T
Series	T-series Latest™
Description	Viscous Semi-Solid near Phase Change Temp.
Appearance	Translucent.
Base Material	Inorganic Salts
Phase Change Temp.	28-30oC	24-26oC	19-20oC	17-19oC
Sub Cooling	2oC max.	2oC max.	2oC max.	2oC max.
Specific Gravity	1.48-1.50	1.48-1.50	1.48-1.50	1.48-1.50
Latent Heat Practically	175 Joules/g	175 Joules/g	175 Joules/g	175 Joules/g
Latent Heat Theoretical	188 Joules/g	188 Joules/g	188 Joules/g	188 Joules/g
Spec. Heat	2 Joules/g oC	2 Joules/g oC	2 Joules/g oC	2 Joules/g oC
Thermal Cond.	1Watt/m oC	1Watt/m oC	1Watt/m oC	1Watt/m oC
Congruent Melting	Yes	Yes	Yes	Yes
Flammability	No	No	No	No
Hazardous	No	No	No	No
Thermal Stability	> 10000 cycles	> 10000 cycles	> 10000 cycles	> 10000 cycles
Max. Operating Temp.	100oC	100oC	100oC	100oC
Rates	Available on request.

T-series is the Latest in PCM technology, Generation-X. It is not degradable with time. It can be used in thicker layers greater than 1” (>25mm). This product has made the earlier PCMs obsolete. Go to our write-up on Latest™ 29T. Latest™ 25T, Latest™ 20T, Latest™ 18T salts are similar to Latest™ 29T.

Table of Cycle No. V/s Latent Heat & Sub Cooling for PCM Latest™29T

Cycle No	100	200	300	400	500	1000		1000	1500	2000	1500	2000	2500	3000
Latent Heat KJ/Kg	196	188	188	192	185	178		178	175	170	172	175	178	170
Sub Cooling oC	0.5	1.0	0.9	0.8	0.7	1.0		1.0	1.1	1.2	1.3	1.2	1.3	1.4

The Error in measurement of Latent Heat can be upto 5% and The Thermometer Sensor can be off by 0.5^oC

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Latest^TM 29T

Phase Change Materials (PCMs) are "latent" thermal storage materials. They use chemical bonds to store and release heat. The thermal energy transfer occurs when a material changes from a solid to a liquid, or from a liquid to a solid form. This is called a change in state or "phase." Initially, these solid-liquid PCMs perform like conventional storage materials; their temperature rises as they absorb heat. Unlike conventional heat storage materials, when PCMs reach the temperature at which they change phase (their melting point), they absorb large amounts of heat without getting hotter. When the ambient temperature in the space around the material drops, the PCM solidifies, releasing its stored latent heat. PCMs absorb and emit heat while maintaining a nearly constant temperature. Within the human comfort and electronic-equipment tolerance range of 20°C to 36°C, latent thermal storage materials are very effective. The main applications for PCMs are when space restrictions limit larger thermal storage units in direct gain or sunspace passive solar systems. PCM may be used in Thermal Enclosures like Telecom Shelter Chambers BTS or BT Shelters or solar domestic hot water heating or passive solar space heating/cooling systems or in air-conditioning & refrigeration or cool-clothing.

Glauber's salt, Soda Ash, Sodium Acetate and paraffin wax are the most commonly used PCMs in solar heating systems. Although these compounds are fairly inexpensive, the packaging and processing necessary to get acceptable performance from them is complicated and costly. They are not offering a reliable pattern of releasing heat as the chemicals in these PCMs separate and stratify when in their liquid state. These PCMs  have not always re-solidified properly. When temperatures dropped, they did not completely solidify, reducing their capacity to store latent heat. These problems have been addressed by packaging phase change materials in thin or shallow containers, and by adding clumping agents. Many salt hydrate PCMs have the disadvantage that during extraction of stored heat the material super-cools before freezing. This reduces the utility of the materials and if too severe, it can completely prevent heat recovery. They lose their heat storage property after some cycles. These types of Phase Change Materials, however, compare unfavorably with the newer generation of low-cost, highly efficient PCMs. Researchers now label these older compounds as "limited utility" Phase Change Materials PCMs.  Phase Change Material perform best in containers that—when combined with the PCM—total one inch (25.4 millimeters). However, our T-Series Latest™ PCMs have defied this restriction. The packaging material should conduct heat well; and it should be durable enough to withstand frequent changes in the storage material's volume as phase changes occur. It should also restrict the passage of water through the walls, so the materials will not dry out. Packaging must also resist leakage and corrosion. Aluminum, steel and polyethylene are common packaging materials.

Thermal Salt Latest™29T

Our Thermal Salt Latest™29T is a mixture of several ingredients. Most of these items are manufactured by us or by our sister concerns. Its properties are as under:

 

Specific Gravity                        :           1.5

Freezing Point                           :           28^oC

Melting Point                            :           29^oC

Latent Heat of Fusion               :           175 KJoule/Kg (40 K. Cal/Kg).  255 KJ/ltr (60000 KCal/Cu.m)

*Most manufacturers report the heat of fusion in a temperature range, like 20^oC to 35^oC. The specific heat of PCM in this range will get added to the values. For this temperature range

*Latent Heat of Fusion             :           210 KJoule/Kg (50 K. Cal/Kg).

Shelf Life                                  :           Infinite

Max. Operating Temp.             :           100^oC

For a Live-Site Trial of Back-up Air-conditioning with Thermal Salt Latest™29T visit our Bookmark on Live Site Trial in Telecom Shelters 

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 TECHNO-COMMERCIAL STATEMENT OF PCM PRODUCT S-series Latest™

PCM Energy P. Ltd.	PCM Latest™	PCM Latest™	PCM Latest™	PCM Latest™
Product	Latest™32S	Latest™34S	Latest™36S	Latest™48S
Series	S-series Latest™
Description	Viscous Semi-Solid near Phase Change Temp.
Appearance	Cream or Gray
Base Material	Inorganic Salts
Phase Change Temp.	31-32oC	33-34oC	36oC	48oC
Sub Cooling @ 1000 cycles	Small	Small.	Small	Small
Specific Gravity	1.45	1.45	1.45	1.45
Latent Heat Theoretical	230 Joules/g	250 Joules/g	260 Joules/g	260 Joules/g
Latent Heat Practical	>200 Joules/g	>220 Joules/g	>230 Joules/g	>230 Joules/g
Spec. Heat	2 Joules/g oC	2 Joules/g oC	2 Joules/g oC	2 Joules/g oC
Thermal Cond.	0.6Watt/m oC	0.6Watt/m oC	0.6Watt/m oC	0.6Watt/m oC
Congruent Melting	Yes	Yes	Yes	Yes
Flammability	No	No	No	No
Hazardous	No	No	No	No
Thermal Stability	> 10000 cycles	> 10000 cycles	> 10000 cycles	> 10000 cycles
Max. Operating Temp.	100oC	100oC	100oC	100oC
Rates	Available on request.

Go to our Book Mark for a write-up on Latest^TM 36S. Latest™ 32S, Latest™ 34S, Latest™ 45S salts are similar to Latest™ 36S.

 

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Latest^TM36S

 

Thermal Salt Latest™36S.

Our Thermal Salt Latest™36S is a mixture of several ingredients. Most of these items are manufactured by us or by our sister concerns. Its properties are as under:

 

Specific Gravity                        :           1.4

Melting Point                            :           36^oC. There can be some freezing/melting in 3^oC around it.

Latent Heat of Fusion               :           250 KJoule/Kg (60 K. Cal/Kg).

                                                             340 KJoule/liter (81000 KCal/Cu.m)

*Most manufacturers report the heat of fusion in a temperature range, like 20^oC to 40^oC. The specific heat of PCM in this range will get added to the values. For this temperature range

*Latent Heat of Fusion             :           300 KJoule/Kg (72 K. Cal/Kg).

Thermal Expansion                  :           The coefficient of thermal expansion is the least offered in the industry. This eliminates cracking or shattering of containers and tubes.

Max. Operating Temp.             :           100^oC 

 

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Back-up Air-conditioning with Latest™29T Phase Change Material PCM

Power Failure is very common in developing countries. Most BT Shelters or Telecom Enclosures are equipped with electronic Equipments and Battery for emitting proper signal to the cell-phone users. When the power fails, the temperature inside the BTS start rising very rapidly due to heat generated by the equipments and also due to ambient conditions. Diesel Generators are provided to give back up. However they are largely depended on the alertness of the watchman cum operator at the site. The contractors often delay in sending diesel aggravating the problem. To minimize the dependence on generators, Back-up air-conditioning may be provided by phase change material. Latest™ 29T is used in India for giving back-up Air-conditioning. 240kg of Phase Change Material Latest™29T is generally used per BTS. 240kg*175 KJ/kg = 42000 K. Joules of backup.  This is equal to 42000/3600 = 11.6 KWH of energy (Theoretical L. H. value of Latest™29T is 188J/Kg giving theoretical back-up of 12.5KWH). We can give you False Ceiling "Day-Night" temperature balancer. We can also give Modular Heat Exchanger for "Day-Night" temperature balancing.

 

TECHNO-COMMERCIAL STATEMENT OF PCM PRODUCT T-series Latest™

PCM Energy P. Ltd.	PCM Latest™
Product	Latest™29T
Series	T-Series Latest™
Description	Viscous Semi-Solid near Phase Change Temp.
Appearance	Translucent
Base Material	Inorganic Salts
Phase Change Temp.	28-30oC
Sub Cooling @ 1000 cycles	2 oC max.
Specific Gravity	1.48-1.50
Latent Heat Theoretical	188 Joules/g
Latent Heat Practical	>175 Joules/g
Spec. Heat	2 Joules/g oC
Thermal Cond.	1Watt/m oC
Congruent Melting	Yes
Flammability	No
Hazardous	No
Thermal Stability	> 10000 cycles
Max. Operating Temp.	100 oC
Rates	Available on request.

Latest 25™T, Latest 20™T, Latest 18™T salts are similar to Latest 29™T. Phase Change Materials perform best in containers that—when combined with the PCM—total one inch (25.4 millimeters). However, our T-Series Latest™ PCMs have defied this restriction. T-series is the Latest in PCM technology, Generation-X. It is not degradable with time. It can be used in thicker layers greater than 1” (> 25mm). This product has made the earlier PCMs obsolete.

For maintaining a Green House at 16^oC Click visit our book-mark at http://pcmenergy.com/products/acbackup.htm#GreenHouse

For Day-Night Temperature Balancing at 24^oC (Free AC) click on     http://pcmenergy.com/products/acbackup.htm#DayNightAC

Free Cooling for BT Shelters (Telecom Shelter)

Weather Information

Month	Ahmedabad		Bhopal		Hyderabad		Jaipur		Lucknow		Nagpur		New Delhi
	Mean Temp.oC		Mean Temp.oC		Mean Temp.oC		Mean Temp.oC		Mean Temp.oC		Mean Temp.oC		Mean Temp.oC
	Min	Max	Min	Max	Min	Max	Min	Max	Min	Max	Min	Max	Min	Max
Jan	11.7	28.4	10.2	25.3	14.7	28.6	7.8	22.5	6.9	22.6	12.4	28.6	7.3	21.1
Feb	13.8	31.3	12.4	28.6	17.0	31.8	10.7	25.7	9.3	26.0	15.0	32.1	10.1	24.2
Mar	18.8	36.0	17.1	33.6	20.3	35.2	15.8	31.5	14.2	32.2	19.0	36.3	15.4	30.0
Apr	23.4	39.9	21.8	38.3	24.1	37.6	21.4	37.0	20.5	38.1	23.9	40.2	21.5	36.2
May	26.2	41.8	25.5	40.7	26.0	38.8	25.4	40.3	24.7	40.5	27.9	42.6	25.9	39.6
June	27.0	38.4	25.3	37.0	23.9	34.4	27.2	39.3	27.1	38.7	26.3	37.8	28.3	39.3
July	25.7	33.3	23.1	30.6	22.5	30.5	25.5	33.9	26.1	33.6	24.1	31.5	26.6	35.1
Aug	24.8	31.9	22.4	28.8	22.0	29.6	24.3	32.0	25.6	32.5	23.6	30.4	25.9	33.3
Sept	24.1	33.4	21.4	30.5	21.7	30.1	22.9	33.2	24.3	33.0	22.9	31.8	24.4	33.9
Oct	20.9	35.8	18.4	32.0	20.0	30.4	18.6	33.4	19.0	32.5	19.8	32.6	19.5	32.9
Nov	16.5	33.2	14.1	29.0	16.4	28.8	13.1	29.0	11.8	28.9	14.9	30.4	12.8	28.3
Dec	13.0	29.8	10.9	25.9	14.1	27.8	9.1	24.4	7.4	24.1	12.1	28.2	8.2	23.0

 

 

 

 

 

 

 

The above details are the mean maximum and minimum temperatures in various cities in the “Hinter Land”. The selected cities do not include any of the costal towns as the costal towns have a different temperature pattern. The above information is available from World Weather Information Service, India Meteorological Department. A close scrutiny shows that the mean monthly maximum temperature in India, in the hinterland can be 43^oC and a peak time maximum temperature in India, in the hinterland can be 45^oC with an occasional shoot-upto 50^oC. The corresponding minimum temperature can be 27^oC on that day. A Phase Change Material of 36^oC is ideally suited for such a climate and for a BT Shelter that is targeting a maximum temperature of 40^oC inside the shelter.

The worst day in the year may have a temperature profile in a day as under:

40-45 oC+	for   4hours
36-40 oC	for   8 hours
27-36 oC	for 12 hours

The temperature pattern in the BT Shelter can be as under:

Hours	Ambient	Shelter Temp. oC	Shelter Temp. oC	Energy Load
	TempoC	w/o PCM	with LatestTM 36S	KWH
04	40-45+	50-55	38-40	2.5KWH .. Discharging
08	36-40	46-50	36-38	2.5KWH .. Discharging
12	27-36	37-46	27-36	Charging PCM.

The PCM of Melting Point 36^oC is well suited for the job. Ideally we must have enough PCM to take care of uncertainties. For a big Shelter, we propose to have 100 kg of PCM of >200 Kilo Joules/kg which means 20000 KJ for the system. We can have profiles of PCM filled panels on a rack. This will store 20000 KJ for the system. 20000 KJ means 20000/3600 = 5.55 KWH. For a small Site 50Kg of material will be enough. This presentation is made for starting an interaction with user. The user may evaluate, amend and interact with us.  Please check our write-up on Latest^TM 36S. Depending upon the need one can select, Latest 25™S, Latest 30™S, Latest 45™S salts that are similar to Latest 36™S

TECHNO-COMMERCIAL STATEMENT OF PCM PRODUCT S-series Latest™

PCM Energy P. Ltd.	PCM Latest™
Product	Latest™36S
Series	T-series Latest™
Description	Viscous Semi-Solid near Phase Change Temp.
Appearance	Cream or Gray
Base Material	Inorganic Salts
Phase Change Temp.	34-36oC
Sub Cooling @ 1000 cycles	Small
Specific Gravity	1.45
Latent Heat Theoretical	260 Joules/g
Latent Heat Practical	>230 Joules/g
Spec. Heat	2 Joules/g oC
Thermal Cond.	0.6Watt/m oC
Congruent Melting	Yes
Flammability	No
Hazardous	No
Thermal Stability	> 10000 cycles
Max. Operating Temp.	100 oC
Rates	Available on request.

 

Depending upon the need one can select, Latest™ 32S, Latest™ 34S, Latest™ 36S salts that are similar to Latest™ 36S. Phase Change Materials perform best in containers that—when combined with the PCM—total one inch (25.4 millimeters). However, our S-Series Latest™ PCMs have defied this restriction. S-series is the Latest in PCM technology, Generation-X. It is not degradable with time. It can be used in thicker layers greater than 1” (> 25mm). This product has made the earlier PCMs obsolete.                     

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                                    PCM filled Panels.                                              PCM filled Aluminum Pipes         

    

                     3 Panels View                                               Telecom Shelter  

 

                                   Aluminum Bottles    HDPE Balls      SS Balls in diff. sizes      Jacket

Hermetically Sealed Profile of Any Size Like 16mm*160mm*1000mm OR 20mm*200mm*850mm or …..etc,  offered in Polymer or Aluminum filled with desired Grade of PCM. We can give PCMs in Aluminum or Pet Bottles, HDPE or SS Balls or in Aluminum Sinks or in any container as per your choice.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cold Storage, Shipping and Sundry Application:

 

 

Several Types of Packing can be custom made for cold storage and shipping application. Insulated Containers having back up of PCM of appropriate temperature (like -40^oC or say +18^oC) can be offered. As a demonstration, we have shown below a small size "PCM backed Insulated Container". It has four PCM filled profiles inserted in a special high-class insulated box. The box was kept for 30 days at 18^oC by filling it with appropriate PCM. Containers of any size and shape can be tailor made.

                 

Phase Change Material PCM Filled Insulated Boxes for Transport of Medicine, Food, Live Culture, Human Organs etc. are available in several sizes.

 

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PCM Energy P. Ltd
 

Mazgaon,  Mumbai   400 010,   INDIA
TEL: 91-22-23770100,  23774610,  23726950,  23723564. FAX: 91-22-23728264.

Cell Call to Anmol: +91-9821870100

Email: info@pcmenergy.com

 

Copyright and Usual Disclaimer is Applicable.
Last updated: 11 July, 2010.