Member of
D.S.E. group of COMPANIES
|
Member of D.S.E. group of COMPANIES |
Authorized Consultant for Analyses & Supervision of Energy
Management Projects
Energy management projects in hotels.
Energy management projects in hospitals.
Energy management projects in campus.
Activities and Projects in the Commercial Market
Design and Implementation of CSDHW - Central Solar Domestic Hot Water Systems for markets in Spanish, Greece etc. & Energy Survey and Management.
Design and implementation of 20 projects of large CSDHW Spain.
Development of the SLOW – FLOW concept which caused a very optimistic success to these projects . The SLOW – FLOW concept is accepted with a resonance penetration among the Solar Energy Applications .
The “SLOW – FLOW “ systems are accumulating success by the supplying of the promised Solar Energy as specified to the hotel owners, the results reduced the hotels expenses and shortened the return the investment for a period of 4 –5 years !!!
The design of 700 suites - “Robinson club Hotel” in Kreta – Greece on 1998 performed the prove for the success and expectations of the SLOW – FLOW concept for a project of this extend .
These Activities included all aspects: (scientific, engineering, technical, economical, etc.). As a result, many energy saving opportunities were implemented very economically.
Techno – Economical Energy Surveys
Herewith is a partial list for the results of Energy Surveys implementation :
Detailed Energy survey that was done for “Chromagen” ,pointed out an energy saving potential of 100,000 $/year. With a return of investment of 3 – 4 years !!!
Energy survey that was done in a very large restaurant, dinning hall and laundry, pointed out an energy saving potential of 50,000 $/year. With a return of investment of 2 – 3 years!!!
Energy survey for an agriculture facility pointed out an energy saving potential of 25,000 $/year. With a return of investment of 3 – 5 years !!!
Hotels with installed SLOW FLOW Concept CSDHW
systems – Partial List :
Nr. Hotel Location ___________________________________________________________________
in Spain
Alcudia Gardens Palma De Mallorca - Spain 0034 971 547 368 / 69
Palm Gardens - “ - 0034 971 547 005
San Garden - “ -
Bahia Gardens - “
Tropic Gardens - “ -
Alcudia Park - “ -
Dunas Park - “ -
Caribe - “ -
Viva - “ -
Sun Inn - “ -
Club De Vacasion - “ -
Semar - “ -
Sant Jordi - “ -
in Greece
Robinson Club Lyttos Beach Kreta Mr. Themis P. Vranas,
Patra Univerity Hospital Athens Phone : 0030 1 778 4048
Marketing and technical aspects of “ SLOW FLOW “ Concept for Individual & Central Solar Water
Heating Systems
The following aspects were pointed out for elaboration of the SLOW FLOW to the people dealing with selling to customers and the installers.
B – Abstract
Various single pass and multi pass individual and central solar water heating systems are studied theoretically and examined practically from the aspect of life – cost in order to arrive at a configuration yielding the highest benefit/cost ratio.
Based on mathematical models and intensive field experience with various systems, (individual and central) we found out that a Solar Water Heating system based on the Slow Flow concept as designed and built by us are meeting these desired criteria.
Accumulated experience from the last 10 years support our models and justified our approach on the Slow Flow concept that have the desired high benefit/cost ratio.
C – General
The “Slow Flow” system has dramatic advantages compared with “Common system”.
Decreasing of water / liquid flow is achieved by lowering the bottom of the tank below the top edge of the collector , where the optimal Slow Flow will be achieved by locating the Tank bottom at 60% of the Collector height ( between the storage bottom base line to the top edge of the Collector ).
D – Common system
When the tank is above the collector, about 5 to 7 times of tank capacity is being circulating through the collector during sunny days , so that intensive circulation, causes the water in the tank to be in a uniform temperature.
At cold season (Autumn, Spring and part of Winter), and cold zones when ambient temperature is low and solar radiation is limited (because of cloudy sky), the temperature in the tank does not reach a usage temperature and the heating booster
( usually electrical heating element ) is being operated.
By heating the water during the day with a heating booster which increases the water temperature in the tank, we cause the solar system a decrease of its efficiency.
When solar heating process starts from cold position , then the water temp. in the tank flowing to the collector doesn’t have a usage temperature till about 10 o’clock at morning.
While In “common system”, exist a reverse thermosyphon process that produce heat losses and causes the system to suffer from “night cooling”.
E – Slow Flow system
The flow rate is being decreased by lowering the tank bottom below the top edge of the Collector .
The decrease of the flow depends on the derive force “He” that is influenced by the geometry of the collector and tank configuration, (in simple words, the height of the bottom of the tank related to the height of the collector).
Practically - “He” controls the flow rate.
The optimal position of the tank bottom should be 60% of the collector height ( the height between the base line level to the top edge of the Collector )
But if we lower the tank below this height , then the efficiency of the system will fall down rapidly.
A Slow flow system is very sensitive to a reverse thermosyphon flow.
In order to prevent this phenomenon we install a reverse thermosyphon check valve that blocks the reverse flow and decreases the heat loss to minimum.
The Slow flow system has a relative low silhouette compared to the “common system” ,that fact enables the installation of a thermosyphon system were the collector positioned on an inclined tile roof specifically when the tank install under the tile roof.
F – Comparison of a “Common” system to “Slow Flow”
In field-tests that we carried out , we found that Slow Flow system has higher efficiency than a “common” one by maximum up to 19 %
The water leaving the collector in a Slow Flow system has a usage temperature.
As a result – all the accumulated hot water are ready for use.
In “Slow Flow” system you get hot water ready to be used with no need for electrical boost, much early in the morning ( minimum 2 hours earlier than by a “Common system” ).
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