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PCM Energy P. Ltd
We have several Associated Units
General Products - AC Backup Phase Change Material - Encapsulation Method of PCM Phase Change Material Manufacturers - Telecom Shelters Phase Change Material - Doctor Says - Phase Change Material Air Conditioner at 21C or 29C
Compact Fit & Forget Modular Air-Condition Back-up units are in multiple of 1KWH or 30minutes or ..
We do Retro-fitting of PCM based Air-condition Back-up Systems in existing shelter ..... We give Live-site Trials .....
Use our PCM Battery Jackets to maintain Batteries at 20-25°C or 30-35°C.
Phase Change Material Basic Telecom Shelter PCM Manufacturers
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 solar 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 PCM drops, it 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 35°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. PCMs may be used in Thermal Enclosures like Telecom Chambers BTS or BT Shelters ( Basic Telecom Shelter )or solar domestic hot water heating or passive solar space heating/cooling systems.
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 separate and stratify when in their liquid state. These materials 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 thermal salts 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 PCMs, however, compare unfavorably with the newer generation of low-cost, highly efficient Phase Change Materials. Researchers now label these older compounds as "limited utility" PCMs. 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. 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.
We cannot help making a negative comment on the products offered by other brands. Most of the brands are offering Thermal-Salt 29 that freezes at less than 18°C, making them practically useless in tropical regions. The shelf life of some of the vendors is hardly 45-60 days, making its use by long distance importers almost impractical. Most of such vendors are not manufacturers of the major ingredients but only compounders. 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.
Latest 29T: PCM LatestTM Brand with Melting Point 29°C and Latent Heat of fusion 175 KJoule/Kg or 260 KJoule/liter. It is best suited for Air-Condition Back-up to BT Shelter or Telecom Shelter.
Latest 36S: PCM LatestTM Brand with Melting Point 36°C and Latent Heat of fusion >230KJ/Kg (260 KJoule/Kg or 357 KJoule/liter). It is best suited for Air-Cooled Out Door BTS or Telecom Shelter.
Telecom Enclosure: PCM or Phase Change Material widely used in Telecom Enclosures ( BTS or Basic Telecom Shelters) is Latest TM 29T for Air-condition Back Up AC and 36S for Free Cooling. We also Offer Polymer-based PCM-Filled Profiles or Panel and Battery Jacket, Balls, Pipes, Heat Sinks, Bottles and Aluminum/SS/MS PCM-Filled Profiles etc.. We also supply Telecom Shelter and provide engineering services and offer complete unit, with Air Circulators and Controls for Back-up Cooling in Existing Shelter (Retrofit) and in New Shelters.
Back-up Air-conditioning with Latest™29T PCM
Power Failure is very common in developing countries. Most BTS or Basic Telecom Shelters or Telecom Enclosures are equipped with electronic Equipments and Battery for emitting proper signal to the cell-phone users. Ac or Air conditioning is provided to keep it cool. When the power fails, the temperature inside the BTS or Basic Telecom Shelters 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 to Air-Conditions. 240kg of Latest™29T is generally used per BTS. 240kg*180 J/kg 43200 K Joules of backup. This is equal to 43200/3600 = 12 KWH of energy ( Theoretical Value is 188KJ/Kg of PCM giving back-up of 12.5 KWH).
Live-Site Trial in a Telecom Shelter after Retro-fitting it with 210 Kg of PCM Latest™29T (10 KWH back-up)
210 Kg of Latest29T PCM (10KWH) filled profiles were installed in an Existing BTS Basic Telecom Shelters of 2m Length by 2.5m width by 2.7m Height. Five thermometers were installed to measure temperature at various points. The Air-condition was switched off when the temperature was 17.3°C. Ambient temperature was also measured. The battery voltage was observed as per the instruction of the site-officer. The permissible maximum temperature that can be reached was targeted to 36°C. This temperature was not reached in 6 Hours of the run. In a blank reading with-out Latest29T PCM the target maximum temperature crossed in less than 1 hour.
Minutes after Power Shutdown - 0min - 030m - 060m - 120m - 180m - 210m - 270m - 300m - 330m - 360m
Average Temp°C (of 5 Sensors)- 17.3 - 22.4 - 25.2 - 29.1 - 31.3 - 32.1 - 32.8 - 33.1 - 33.2 - 33.3
Other Relevant Record
Outside Temp°C --------------- 26.5 - 28.0 - 29.5 - 31.0 - 33.0 - 33.0 - 30.0 - 28.5 - 28.0 - 26.7
Battery Voltage -------------- 25.18- 24.99- 24.98- 24.65- 24.45- 24.21- 23.89- 23.61- 23.45- 22.94
Shelter Temp Centre Top °C --- 17.5 - 23.1 - 25.8 - 29.5 - 31.0 - 31.7 - 33.5 - 33.5 - 34.0 - 34.1
Permissible limit of Trial was up to Shelter Temperature of 35°C. The Trial was discontinued as the Battery Voltage went low.
The PCM could have lasted for 1-2 Hours more, if the Battery Voltage had not dropped.
Pl click to enlarge
OPERATING EXPENSES COMPARISON USING PHASE CHANGE MATERIAL
Power available 18 Hours/day. 6 hours load shedding. Expense on SHELTER WITHOUT PCM -- SHELTER WITH PCM Power Cost Rs.04,10,625 --------- Rs.05,47,500 DG Cost Rs.09,58,125 --------- Rs.######### Total Cost Rs.13,68,750 --------- Rs.05,47,500 Savings over 5 years Rs.######### --------- Rs.08,21,250 % Savings in fuel cost. Rs.######### --------- 60% Only 25-35% of the above savings will be the cost of retrofitting PCM in an existing shelter. Considerations: 1. Power Cost = Hours of power availability (hrs) X Load (KW) X Cost of Power (Rs. 5/KW-hr) X 365 (Days/year) X 5 years 2. DG Cost = Hours of operation (hrs) X Diesel Cost ( 35 Rs/ltr) X Diesel Consumption (2.5 ltr/hr) X 365 (Days/year) X 5 years 3. Power Cost with PCM is higher as PCM uses energy from AC to charge. PCM charging cost = Load (KW) X Hours of back-up (hrs) X Days per year X Years X Cost of Power (Rs.5/unit) 4. Intangibles like cost of maintenance of DG set, COP of a/c, "green factor" of no emissions are not taken into consideration. 5. Benefits like 80 % book-depreciation in the first year on capital investments of "Energy Management Systems" is added advantage. Our company can undertake retro fitment of PCM's on a turnkey basis.
TECHNO-COMMERCIAL STATEMENT OF PCM PRODUCT T-series Latest™
PCM Energy P. Ltd PCM Latest™ Product Latest™29T also any other grade like Latest™18T, Latest™20T, Latest™22T, Latest™25T Series T-series Latest™ Description Viscous Semi-Solid near Phase Change Temperature Appearance Translucent Base Material Inorganic Salts Phase Change Temperature 28-30°C Sub Cooling 2°C max Specific Gravity 1.48-1.50 Latent Heat Practically 175 Joules/g Latent Heat Theoretical 188 Joules/g Spec. Heat 2 Joules/g°C Thermal Conductivity 1Watt/m °C Congruent Melting Yes Flammability No Hazardous No Thermal Stability > 10000 cycles Max. Operating Temperature 100°C 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.
Latest™ 25T, Latest™ 20T, Latest™ 18T salts are similar to Latest™ 29T
Thermal Salt filled Battery Jacket for Outdoor Telecom Shelter helps keep the battery at the desired temperature even when the internal temperature of the shelter varies widely. It thus enables establishment of two-climate zones in the shelter, enhancing the life of the battery.
Battery Jacket for Outdoor Telecom Shelter
For Advanced Users: Most PCM users are at the elementary stage of using the PCMs. They are ordinarily not conditioned to talk of any deviations from the systems, they have heard of. Using PCM-29 itself is more than adequate mental kick for them. Some vendors manage to convince them that the use of PCMs will save energy charges for them. The primary purpose of the PCMs is to provide a back-up to Air Condition AC and avoid the use of Diesel Generator. The site managers and the watch-man cum operator of the site, may not be sufficiently professional.They often fail to keep the diesel at site and restore to "Keep the Door Open for Cooling" ways to cut corners. The relevance of PCMs is more, if the power failure is a norm in the area of usage. We have a Brain-Wave. Instead of giving 4-6 hours of Back-up, why not give 12-18 hours of Back-up and eliminate the Diesel Generator???!!! This will, of course needs higher battery capacity. In those places, where the whether and equipments permits, you can eliminate the Air Conditioner by using Day-Night temperature balancing with PCM.
In a remote area a site was running on diesel generator and there was no electricity in the region. On receiving an enquiry for installing PCM in the BT Shelter, we had the impulse of telling them that PCM will be of no use to them. One of their junior engineer was very bright and he discussed the details with our senior scientist. He summarized that their diesel generator is installed for working in the extreme conditions of weather and telecom traffic. the generator works on full load, irrespective of the traffic and weather. If PCM back-up is installed, then it will reduce their diesel cost by 50% and hence he ordered for installing the PCM back-up. To the good luck of the junior engineer his theory did work.
Bhopal Mean Temperature°C Month Min--- -- Max--- Jan 10.2°C -- 25.0°C Feb 12.4°C -- 28.6°C Mar 17.1°C -- 33.6°C Apr 21.8°C -- 38.3 May 25.5°C -- 43.7°C June 25.3°C -- 37.0°C July 23.1°C -- 30.6°C Aug 22.4°C -- 28.8°C Sept 21.4°C -- 30.5°C Oct 18.4°C -- 32.0°C Nov 14.1°C -- 29.0°C Dec 10.9°C -- 25.9°C
Similar data on other cities will be available on-line from weather channels
Presentation for Providing Free Cooling in BT Shelters in the “Hinter Land”
The above details are the mean maximum and minimum temperatures in 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 43oC and a peak time maximum temperature in India, in the hinterland can be 45oC with an occasional shoot-up. The corresponding minimum temperature can be 27oC on that day. A PCM of 36oC is ideally suited for such a climate and for a BT Shelter that is targeting a maximum temperature of 40oC inside the shelter.
The worst day in the year may have a temperature profile in a day as under:
40 to 45°C+ for 4hours 36 to 40°C for 8 hours 27 to 36°C for 12 hours
The temperature pattern in the BT Shelter can be as under:
No. of Hours in a day Ambient Temp.°C - Shelter Temp. w/o PCM - Shelter Temp. with 36°C PCM - Energy Load in KWH 04 40-45+ ######## - 50-55°C ############# - 38-40°C ################### - 5KWH Discharging 08 36-40 ######### - 46-50°C ############# - 36-38°C ################### - 5KWH Discharging 12 27-36 ######### - 37-46°C ############# - 27-36°C ################### - Charging PCM.
The PCM of Melting Point 36°C is well suited for the job. Depending on the size of BTS and ambient conditions, the Energy load will vary.
This presentation is made for starting an interaction with user.
Depending upon the need one can select, Latest™ 32S, Latest™ 34S, Latest™ 45S salts that are similar to Latest™ 36S
Telecom Shelter PCM Phase Change Material Manufacturers
PCM Energy P. Ltd
Mazgaon, Mumbai 400 010, INDIA
TEL: 91-22-23770100, 23774610, 23726950, 23723564. FAX: 91-22-23728264
Current Date Time in India is GMT+5:30
Copyright and Usual Disclaimer is Applicable
Last updated: 04.10.2016
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