Patent Document

This application claims the benefit of provisional U.S. Patent Application No. 62/049,050, filed Sep. 11, 2014, and incorporated herein by reference. 
    
    
     FIELD OF THE PRESENT INVENTION 
     The present invention relates to a thermal energy exchanger for bathing shower water with “recovering rate for the residual heat in spent shower water” thereof over 50% other than that the consumed energy quantity of the electricity or gas can be considerably reduced so that manufacturing cost is decreased and energy saving efficiency is increased. Thereby, the purchasing intention of the consumers is spurred and energy saving and carbon reducing effects is promoted. 
     BACKGROUND OF THE INVENTION 
     The inventor applied a Chinese Invention Patent in title of “heat exchanger for bathing shower” with filing number of 20101055693.1 at Nov. 24, 2010, which is also announced in publishing number of CN102478367 at Feb. 12, 2014. The conventional “heat exchanger for bathing shower” comprises a stacked upper deck  30  and a founded lower chassis  40  as well as a front hatch  50  and a rear hatch  50  as shown in  FIGS. 1 through 8 , wherein said upper deck  30 , which is a planiform cuboid extruded by metal material and encompassed by a flat top surface  31 , a bottom surface  32 , a front side  33 , a rear side  34 , a pair of parallel flanks  35 , includes a plurality of screw bores  36  created in the front side  33  and rear side  34  respectively, several parallel septa  37  downwardly disposed on the bottom surface  32  such that a water passage  303  is created between each pair of adjacent septa  37 , an upper docking latch bar  38  in male dovetail cross section being downwardly formed on the terminal of one septum  37 , a circulating bore  39  being created on each septum  37  in interlaced stagger manner, which means a circulating bore  39  in upper section of one septum  37  and another circulating bore  39  in lower section of the other septum  37  for each pair of adjacent septa  37 , so that all the adjacent water passages  303  can be mutually communicable as a continual zigzag circulating duct even being separated by a septum  37  between them, a water intake  301  is created in one flank  35  while a water outtake  302  is created in the other opposed flank  35  respectively; said lower chassis  40 , which is a planiform slab extruded by metal material and encompassed by a top surface  41 , a sole surface  42 , a front side  43 , a rear side  44 , a pair of parallel flanks  45  with same planar shape and area in mating with the upper deck  30 , includes a plurality of screw bores  47  created in the front side  43  and rear side  44  respectively, and a lower docking latch bar  46  in female dovetail cross section, which is upwardly formed on the top surface  41  in a suitable position corresponding to the upper docking latch bar  38  of the specific septum  37  on the upper deck  30  so that the male dovetailed upper docking latch bar  38  and the corresponding female dovetailed lower docking latch bar  46  can be securely engaged in mutual latch manner; and each hatch  50 , which is a planiform slab with suitable planar shape and area to properly cover an interim integral assembly of the upper deck  30  and lower chassis  40  in flush manner, has a plurality of punched holes  51  disposed thereon in corresponding to the screw bores  36  on the upper deck  30  or screw bores  47  on the lower chassis  40  so that both of front and rear hatches  50  can hermetically seal both front sides  43  and  44  as well as both rear sides  34  and  44  of the interim integral assembly of the upper deck  30  and lower chassis  40  in plenum manner including all water passages  303  of continual zigzag circulating duct with septa  37  therein (as shown in  FIGS. 7 and 8 ). 
     Referring to  FIGS. 4 through 6 , the assembling process is described as below. Firstly, align and insert the male dovetailed upper docking latch bar  38  on the upper deck  30  into the female dovetailed lower docking latch bar  46  on the lower chassis  40  (as shown in  FIG. 4 ); secondly, simultaneously apply forces on both of the rear side  34  on the upper deck  30  and the front side  43  on the lower chassis  40  in opposed inward manner to dock both of the upper deck  30  and lower chassis  40  up to flush manner so that a interim integral assembly of the upper deck  30  and lower chassis  40  is assembled (as shown in  FIG. 5 ); and finally, cover both of front and rear hatches  50  on both front sides  43  and  44  as well as both rear sides  34  and  44  of the interim integral assembly of the upper deck  30  and lower chassis  40 , then drive (screws N) in the punched holes  51  on the upper deck  30  through the punched holes  51  on the lower chassis  40  to securely fix the interim integral assembly of the upper deck  30  and lower chassis  40  into a final plenum (as shown in  FIG. 8 ). 
     Please refer to  FIGS. 9 and 10 . The installation and operation methods for a heat exchanger for bathing shower of the present invention are described as below. By means of proper pipe fittings, connect a water inlet pipe  23  of tap water to the water intake  301  on the upper deck  30  while connect a water outlet pipe  22  in water intake  11  of a water heater  10  to the water outtake  302  on the same upper deck  30  to finish the installation before operation (as shown in  FIG. 9 ). For shower, firstly, upon a shower user M starting shower, certain hot shower water W, which comes from the water heater  10  and flow through a water outlet pipe  12 , will spray out of the shower sprayer  13 ; secondly, the hot shower water W will drop on the flat top surface  31  of the upper deck  30  after shower on the body of the shower user M, meanwhile certain cold tap water W 1  will flow into the water passages  303  of the upper deck  30  orderly via the water inlet pipe  23  and the water intake  301  of the upper deck  30 , then circulate among all water passages  303  by means of every circulating bore  39  on each septum  37  (as indicated by arrowhead shown in  FIG. 10 ) to absorb thermal energy of the dropped hot shower water W on the flat top surface  31  of the upper deck  30  so that the cold tap water W 1  becomes warm heat-exchanged water W 2 ; and finally, the warm heat-exchanged water W 2  then flows out of the water outtake  302  on the upper deck  30 ; and then flows into the water heater  10  orderly via the water outlet pipe  22  and the water intake  11  thereof for serving as warm feeding water (as shown in  FIG. 9 ). Thereby, the energy-saving effect for such as electricity or gas consumption of the water heater  10  is achieved. 
     The energy-saving effect for such as electricity or gas consumption of the conventional “heat exchanger for bathing shower” is basically achieved after practical test for product thereof. However, there is a blemish in an otherwise perfect thing that the measured “recovering rates for the residual heat in spent shower water” for the conventional “heat exchanger for bathing shower” is only in range of 15-20%. Accordingly, how to substantially increase the overall “efficiency of heat exchange” so that the energy-saving effect for such as electricity or gas consumption thereof can be essentially enhanced becomes a further seeking goal. Via constantly study and research, an expected sample of the present invention is eventually contrived with measured “recovering rates for the residual heat in spent shower water” for the present invention of “thermal energy exchanger for bathing shower water” is over 50%. 
     SUMMARY OF THE INVENTION 
     The primary object of the present invention is to provide a thermal energy exchanger for bathing shower water comprising a stacked upper deck and a founded lower chassis as well as a front hatch and a rear hatch, wherein the upper deck, which is a planiform cuboid extruded by metal material and encompassed by a creased top surface with certain screw bores suitably located thereon, a bottom surface, a front side, a rear side, a pair of parallel flanks, includes a plurality of parallel septa downwardly disposed on the inner bottom surface, a longitudinal T-shaped docking latch bar being downwardly formed on the terminal of each septum while a longitudinal L-shaped docking latch bar being downwardly formed on the terminal of each flank, a plurality of parallel heat conducting ribs being created between each pair of adjacent septa in inner bottom surface such that the length of the heat conducting rib is shorter than that of the septum; the lower chassis, which is a planiform slab extruded by non-metal material and encompassed by a top surface, a flat sole surface with certain screw bores suitably located thereon, a front side, a rear side, a pair of parallel flanks with same planar shape and area in mating with the upper deck, includes a plurality of longitudinal inverted T-shaped docking latch groove, which are upwardly formed on the top surface in suitable positions corresponding to the longitudinal T-shaped docking latch bars between each pair of adjacent septa on the upper deck, a longitudinal flute on each flank, which is to securely mate with corresponding to the longitudinal L-shaped docking latch bar for each flank on the upper deck, as well as a water intake and a water outtake perforated between the top surface and sole surface; and each hatch, which is a planiform slab with suitable planar shape and area to properly cover the front sides and the rear sides for an interim integral assembly of the upper deck and lower chassis in flush manner, has two rows of certain punched fixing bores disposed thereon in corresponding to the certain screw bores on the upper deck and certain screw bores on the lower chassis so that both of front and rear hatches can hermetically seal both front sides and as well as both rear sides and of the interim integral assembly of the upper deck and lower chassis in plenum manner via screws run through all certain punched fixing bores and corresponding certain screw bores and, and a trough, which combines passages between septa to create a water tunnel of continual zigzag circulating duct among septa therein. With creased top surface of the present invention, even the upper deck of the present invention has same top encompassed area as that for the flat top surface of the conventional upper deck, the actual contacting area with dropped shower water for the creased top surface of the present invention is considerably larger than that of the conventional flat top surface for the conventional “heat exchanger for bathing shower” in publishing number of CN102478367 of Chinese Invention Patent. With additional heat conducting ribs of the present invention, even the upper deck of the present invention has same length of water tunnel as that of the conventional upper deck, the actual heat conducting speed and quantity with dropped shower water for the upper deck with additional heat conducting ribs of the present invention is considerably quicker and larger than those of the conventional upper deck without heat conducting ribs for the conventional “heat exchanger for bathing shower” in publishing number of CN102478367 of Chinese Invention Patent. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective exploded view for conventional “heat exchanger for bathing shower”. 
         FIG. 2  is a perspective schematic view showing an upper deck under drilling bores process by a drilling tool for conventional “heat exchanger for bathing shower”. 
         FIG. 3  is a perspective schematic view showing an upper deck for conventional “heat exchanger for bathing shower”. 
         FIG. 4  is the first perspective schematic view showing assembling process for conventional “heat exchanger for bathing shower”. 
         FIG. 5  is the second perspective schematic view showing assembling process for conventional “heat exchanger for bathing shower”. 
         FIG. 6  is the third perspective schematic view showing assembling process for conventional “heat exchanger for bathing shower”. 
         FIG. 7  is a cross sectional view taken against section line  7 - 7  from previous  FIG. 6 . 
         FIG. 8  is a cross sectional view taken against section line  8 - 8  from previous  FIG. 6 . 
         FIG. 9  is an installed schematic view showing practical usage for conventional “heat exchanger for bathing shower”. 
         FIG. 10  is a cross sectional view taken against section line  10 - 10  from previous  FIG. 9 . 
         FIG. 11  is a perspective exploded schematic view for the first exemplary embodiment of the present invention. 
         FIG. 12  is a cross sectional view taken against section line  12 - 12  from previous  FIG. 11 . 
         FIG. 13  is a cross sectional view taken against section line  13 - 13  from previous  FIG. 11 . 
         FIG. 14  is a perspective assembled schematic view for the first exemplary embodiment of the present invention. 
         FIG. 15  is a cross sectional view taken against section line  15 - 15  from previous  FIG. 14 . 
         FIG. 16  is a perspective assembled view for the first exemplary embodiment of the present invention. 
         FIG. 17  is a cross sectional view taken against section line  17 - 17  from previous  FIG. 16 . 
         FIG. 18  is a cross sectional view taken against section line  18 - 18  from previous  FIG. 16 . 
         FIG. 19  is an operational schematic view after installation for the first exemplary embodiment of the present invention. 
         FIG. 20  is a cross sectional view taken against section line  20 - 20  from previous  FIG. 19 . 
         FIG. 21  is a cross sectional view for a modified upper deck in the first exemplary embodiment of the present invention. 
         FIG. 22  is a cross sectional view showing assembly of a modified upper deck with lower chassis in the first exemplary embodiment of the present invention. 
         FIG. 23  is a perspective exploded view for the second exemplary embodiment of the present invention. 
         FIG. 24  is a cross sectional view taken against section line  24 - 24  from previous  FIG. 23 . 
         FIG. 25  is a cross sectional view taken against section line  25 - 25  from previous  FIG. 23 . 
         FIG. 26  is a perspective assembled view for the second exemplary embodiment of the present invention. 
         FIG. 27  is a cross sectional view taken against section line  27 - 27  from previous  FIG. 26 . 
         FIG. 28  is a cross sectional view taken against section line  28 - 28  from previous  FIG. 26 . 
         FIG. 29  is a cross sectional view for a corrugated surface of a modified upper deck in the second exemplary embodiment of the present invention. 
         FIG. 30  is a cross sectional view showing assembly for a corrugated surface of a modified upper deck with lower chassis in the second exemplary embodiment of the present invention. 
         FIG. 31  is a cross sectional view for an intermediately altered upper deck in the first exemplary embodiment of the present invention. 
         FIG. 32  is a cross sectional view for a laterally altered upper deck in the second exemplary embodiment of the present invention. 
         FIG. 33  is a cross sectional view showing assembly of one intermediately altered upper deck and two laterally altered upper decks with lower chassis in the first and second exemplary embodiments of the present invention. 
         FIG. 34  is a cross sectional view for an intermediately adapted upper deck in the first exemplary embodiment of the present invention. 
         FIG. 35  is a cross sectional view for two laterally adapted upper decks in the second exemplary embodiment of the present invention. 
         FIG. 36  is a cross sectional view showing assembly of one intermediately adapted upper deck and two laterally adapted upper deck with lower chassis in the first and second exemplary embodiments of the present invention. 
         FIG. 37  is a cross sectional view for a serrated surface of the varied upper deck in the first exemplary embodiment of the present invention. 
         FIG. 38  is a cross sectional view for a serrated surface of the varied upper deck in the second exemplary embodiment of the present invention. 
         FIG. 39  is a piping and wiring schematic view for a recovery device in measuring the “recovering rates for the residual heat in spent shower water” of the present invention. 
         FIG. 40  is a characteristic diagram showing various “recovering rates for the residual heat” by multiple sampling of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Referring to  FIGS. 11 through 17 , the structure for the first exemplary embodiment in the “thermal energy exchanger for bathing shower water”  100  of the present invention comprises a stacked upper deck  10  and a founded lower chassis  20  as well as a front hatch  60  and a rear hatch  60 , wherein said upper deck  10 , which is a planiform cuboid extruded by metal material and encompassed by a creased top surface  11  with certain screw bores  16  suitably located thereon, a bottom surface  12 , a front side  13 , a rear side  14 , a pair of parallel flanks  15 , includes a plurality of parallel septa  17  downwardly disposed on the inner bottom surface  12 , a longitudinal T-shaped docking latch bar  18  being downwardly formed on the terminal of each septum  17  while a longitudinal L-shaped docking latch bar  18  being downwardly formed on the terminal of each flank  15 , a plurality of parallel heat conducting ribs  19  being created between each pair of adjacent septa  17  in inner bottom surface  12  such that the length of the heat conducting rib  19  is shorter than that of the septum  17  (as shown in  FIG. 12 ); said lower chassis  20 , which is a planiform slab extruded by non-metal material and encompassed by a top surface  21 , a flat sole surface  22  with certain screw bores  28  suitably located thereon, a front side  23 , a rear side  24 , a pair of parallel flanks  25  with same planar shape and area in mating with the upper deck  10 , includes a plurality of longitudinal inverted T-shaped docking latch groove  26 , which are upwardly formed on the top surface  21  in suitable positions corresponding to the longitudinal T-shaped docking latch bars  18  between each pair of adjacent septa  17  on the upper deck  10 , a longitudinal flute  27  on each flank  25  (as shown in  FIG. 13 ), which is to securely mate with corresponding to the longitudinal L-shaped docking latch bar  18  for each flank  15  on the upper deck  10  (as shown in  FIG. 15 ), as well as a water intake  201  and a water outtake  202  perforated between the top surface  21  and sole surface  22  (as shown in  FIG. 11 ); and each hatch  60 , which is a planiform slab with suitable planar shape and area to properly cover the front sides  13 ,  23  and the rear sides  14 ,  24  for an interim integral assembly of the upper deck  10  and lower chassis  20  in flush manner, has two rows of certain punched fixing bores  63  disposed thereon in corresponding to the certain screw bores  16  on the upper deck  10  and certain screw bores  28  on the lower chassis  20  so that both of front and rear hatches  60  can hermetically seal both front sides  13  and  23  as well as both rear sides  14  and  24  of the interim integral assembly of the upper deck  10  and lower chassis  20  in plenum manner via screws N run through all certain punched fixing bores  63  and corresponding certain screw bores  16  and  28 , and a trough  62 , which combines passages between septa  17  to create a water tunnel  101  of continual zigzag circulating duct among septa  17  therein (as shown in  FIG. 17 ) to assembly an integral thermal energy exchanger set  100 . 
       FIGS. 14 through 18  are views showing the assembling procedure for the first exemplary embodiment in the “thermal energy exchanger for bathing shower water”  100  of the present invention. Firstly, align and insert all the longitudinal docking latch bars  18  on the upper deck  10  into the longitudinal inverted T-shaped docking latch grooves  26  and longitudinal flutes  27  on the lower chassis  20  for snugly docking mutually (as shown in  FIG. 14 ); secondly, simultaneously apply inwardly forces on both of the rear side  14  on the upper deck  10  and the front side  23  on the lower chassis  20  in opposed inward manner to dock both of the upper deck  10  and lower chassis  20  up to flush manner so that a interim integral assembly of the upper deck  10  and lower chassis  20  is assembled (as shown in  FIGS. 14, 15 and 18 ); and finally, cover both of front and rear hatches  60  on both front sides  33  and  43  as well as both rear sides  34  and  44  of the interim integral assembly of the upper deck  30  and lower chassis  40 , then drive screws N through two rows of certain punched fixing bores  63  thereon and corresponding certain screw bores  16  on the upper deck  10  and certain screw bores  28  on the lower chassis  20  to securely fix the hatches  60  as an integral assembly of the upper deck  30  and lower chassis  40  into a final plenum (as shown in  FIG. 16 ). 
       FIGS. 19 and 20  are views showing the installation and operating procedures for the first exemplary embodiment in the “thermal energy exchanger for bathing shower water”  100  of the present invention. For installation, by means of proper pipe fittings, connect a water inlet pipe  4  of tap water to the water intake  201  on the lower chassis  20  while connect a water outlet pipe  3  between water intake  2  of a water heater  1  and the water outtake  202  on the same lower chassis  20  to finish the installation before operation (as shown in  FIG. 19 ). For operating shower, firstly, upon a shower user M starting shower, certain hot shower water W, which comes from the water heater  1  and flow through a water outlet pipe  5 , will spray out of the shower sprayer  13 ; secondly, the hot shower water W will drop on the flat top surface  11  of the upper deck  10  after shower on the body of the shower user M, meanwhile certain cold tap water W 1  will flow into the water tunnel  101  orderly via the water inlet pipe  4  and the water intake  201  of the lower chassis  20 , then circulate among the water tunnel  101  via two troughs  62  and combining passages between septa  17  (as indicated by arrowhead shown in  FIG. 20 ) to absorb thermal energy of the dropped hot shower water W on the top surface  11  of the upper deck  10  so that the cold tap water W 1  becomes warm heat-exchanged water W 2 ; and finally, the warm heat-exchanged water W 2  then flows out of the water outtake  202  on the lower chassis  20 ; and then flows into the water heater  1  orderly via the water outlet pipe  3  and the water intake  2  thereof for serving as warm feeding water (as shown in  FIG. 19 ). Thereby, the energy saving effect for electricity of gas consumption of the water heater  1  is achieved. 
     Comparing to conventional “heat exchanger for bathing shower” in publishing number of CN102478367 of Chinese Invention Patent, the “thermal energy exchanger for bathing shower water” of the present invention apparently has two innovative contrivances of creased top surface  11  and additional heat conducting ribs  19 . With creased top surface  11  of the present invention, even the upper deck  10  of the present invention has same top encompassed area as that for the flat top surface  31  of the conventional upper deck  30 , the actual contacting area with dropped shower water for the creased top surface  11  of the present invention is considerably larger than that of the conventional flat top surface  11  for the conventional “heat exchanger for bathing shower” in publishing number of CN102478367 of Chinese Invention Patent. With additional heat conducting ribs  19  of the present invention, even the upper deck  10  of the present invention has same length of water tunnel  101  as that of the conventional upper deck  30 , the actual heat conducting speed and quantity with dropped shower water for the upper deck  10  with additional heat conducting ribs  19  of the present invention is considerably quicker and larger than those of the conventional upper deck  10  without heat conducting ribs for the conventional “heat exchanger for bathing shower” in publishing number of CN102478367 of Chinese Invention Patent. 
       FIG. 39  is a piping and wiring schematic view for a recovery device in testing the “recovering rates for the residual heat in spent shower water” of the present invention. 
     1. Testing Conditions: 
     (a): Shower room is closed type with dimensions of length×width being in 90×90 cm. 
     (b): Ambient temperature is 25±2 degrees centigrade. 
     (c): Temperature for intake cold tap water is 15±1 degrees centigrade. 
     (d): Flux for intake cold tap water is 3±0.3 L/min. 
     (e): Shower sprayer S is centrally located above the top surface  11  for the upper deck  10  of the thermal energy exchanger set  100  with fixed height of 1.5 m. 
     (f): Diameter for water output of the shower sprayer S is not less than 1 mm. 
     (g): Temperature for output hot shower water W of the shower sprayer S is 45±1 degrees centigrade. 
     2. Testing Method: 
     Step  1 : Open valve for inlet tap water R, valve for intake water R 1  and flow regulating valve R 2  so that the flux for intake cold tap water is 3±0.3 L/min and measure the temperature for intake cold tap water is 15±1 degrees centigrade. 
     Step  2 : Turn on power switch K and adjust the power adjust knob B of the water heater  1  such that the temperature for output hot shower water W of the shower sprayer S is 45±1 degrees centigrade. 
     After 5 minutes stable period, measure actual temperature for output hot water of the shower sprayer S from water outtake  102  of the thermal energy exchanger set  100 . 
     Step  3 : Calculate the recovering rates for the residual heat in spent shower water” η for testing parameters obtained from above procedure with formula as below:
 
η=[(θ2−θ1)/(θ3−θ1)]×100%
 
     Wherein: 
     η denotes to “recovering rates for the residual heat in spent shower water”. 
     θ1 denotes to “temperature for the intake water of the present invention”. 
     θ2 denotes to “temperature for the outtake water of the present invention”. 
     θ3 denotes to “temperature for the shower water output from the shower sprayer S”. 
     3. Testing Results: 
     According to the formula above, via  421  sampling tests with various parameters, a “characteristic curve of recovering rates for the residual heat in spent shower water” of the present invention is diagramed as shown in  FIG. 40  with “number of sampling tests” as horizontal coordinate (X-axis) while “setting temperature and recovering rates for the residual heat in spent shower water” as vertical coordinate (Y-axis). 
     Specifically, taking the ninety-first sample in  FIG. 40  as example, the “recovering rate for the residual heat in spent shower water” η of the present invention is 56% based on the calculation from foregoing formula with parameters in association of using thermal energy exchanger set  100  as following: 
     θ1: Temperature for intake cold tap water is 14.5 degrees centigrade. 
     θ2: Temperature for outtake warm recover water is 31 degrees centigrade. 
     θ3: Temperature for output hot shower water W of the shower sprayer S is 44 degrees centigrade. 
     Generally, from manifestations for all data in every sample in  FIG. 40  as supporting evidence, the “recovering rate for the residual heat in spent shower water” η of the present invention achieves over 50% without doubt via using thermal energy exchanger set  100  of the present invention. Accordingly, the consumed energy quantity of the electricity or gas for using “thermal energy exchanger for bathing shower water” of the present invention can be doubly reduced comparing to that for using conventional “heat exchanger for bathing shower” in publishing number of CN102478367 of Chinese Invention Patent. 
       FIG. 21  is a cross sectional view for a modified upper deck in the first exemplary embodiment of the present invention while  FIG. 22  is a cross sectional view showing assembly of a modified upper deck with lower chassis in the first exemplary embodiment of the present invention. Wherein, both sides of the heat conducting ribs  19  in the inner bottom surface  12  of the upper deck  10  are modified into corrugated surface  191  (as shown in  FIG. 21 ) so that the heat exchanging efficiency for the upper deck  10  with heat conducting ribs  19  is further enhanced. Thus, not only the “recovering rates for the residual heat in spent shower water” η in the water tunnel  101  is increased but also the consumed energy quantity of the electricity or gas is reduced (as shown in  FIG. 22 ). 
       FIGS. 23 through 28  are views showing the structure for the second exemplary embodiment in the “thermal energy exchanger for bathing shower water”  100  of the present invention, wherein each end of the flank  15   a  in the upper deck  10   a  is changed into an upwardly tucked skirt  181  (as shown in  FIG. 24 ) while each of flank  25   a  in the lower chassis  20   a  is changed into raised bar  29  with an inwardly tucked flute  271  (as shown in  FIG. 25 ). Via snugly mating between each tucked flute  271  in the flank  25   a  of the lower chassis  20   a  and each corresponding tucked skirt  181  in the flank  15   a  of the upper deck  10   a , the latching strength between the lower chassis  20   a  and upper deck  10   a  is substantially enhanced (as shown in  FIGS. 27 and 28 ). 
       FIG. 29  is a cross sectional view for a corrugated surface  191  of a modified upper deck  10   a  in the second exemplary embodiment of the present invention while  FIG. 30  is a cross sectional view showing assembly for a corrugated surface  191  of a modified upper deck  10   a  with lower chassis in the second exemplary embodiment of the present invention. Wherein, both sides of the heat conducting ribs  19  in the inner bottom surface  12   a  of the upper deck  10   a  are modified into corrugated surface  191  (as shown in  FIG. 29 ) so that the heat exchanging efficiency for the upper deck  10   a  with heat conducting ribs  19  is further enhanced. Thus, not only the “recovering rates for the residual heat in spent shower water” η in the water tunnel  101  is increased but also the consumed energy quantity of the electricity or gas is reduced (as shown in  FIG. 30 ). 
     Please refer to  FIGS. 31 through 33 .  FIG. 31  is a cross sectional view for an intermediately altered upper deck in the first exemplary embodiment of the present invention, wherein a longitudinal extruding wing  111  with two slant inwardly latching ribs  112  in inner bottom surface  12  is disposed at each joint for each flank  15   a  and top surface  11   b  in an intermediately altered upper deck  10   b  (as shown in  FIG. 31 ).  FIG. 32  is a cross sectional view for a left laterally altered upper deck in the second exemplary embodiment of the present invention, wherein a longitudinal extruding groove  113  is disposed at right joint for the internal flank  15   c  and top surface  11   c  while a tucked skirt  181  is disposed at the left flank  15   a  in the left laterally altered upper deck  10   c  (as shown in  FIG. 32 ); similarly, for a right laterally altered upper deck, wherein a longitudinal extruding groove  113  is disposed at left joint for the internal flank  15   c  and top surface  11   c  while a tucked skirt  181  is disposed at the right flank  15   a  in the right laterally altered upper deck  10   c  (not shown).  FIG. 33  is a cross sectional view showing assembly of one intermediately altered upper deck and two laterally altered upper decks with lower chassis in the first and second exemplary embodiments of the present invention. Via snugly mating between each longitudinal extruding wings  111  with two slant inwardly latching ribs  112  at each flank  15   b  of the intermediately altered upper deck  10   b  in the first exemplary embodiment and each tucked flute  113  at internal flank  15   c  of the laterally altered upper deck  10   c  in the second exemplary embodiment (as indicated by two enlarged views shown in  FIG. 33 ), the latching strength between the lower chassis  20   a  and upper deck  10   a  is substantially enhanced (as shown in  FIG. 33 ) so that various floor covering areas in different shower room can be suitably fitted willfully at discretion of the user. 
     Please refer to  FIGS. 34 through 36 .  FIG. 34  is a cross sectional view for an intermediately adapted upper deck in the first exemplary embodiment of the present invention, wherein a longitudinal extruding wing  111   d  with two slant inwardly latching ribs  112   d  in inner bottom surface  12  is disposed at left joint for the flank  15   d  and top surface  11   d  while a longitudinal extruding groove  113   d  is disposed at right joint for the flank  15   d  and top surface  11   d  in an intermediately adapted upper deck  10   d  (as shown in  FIG. 34 ).  FIG. 35  is a cross sectional view for two laterally adapted upper decks in the second exemplary embodiment of the present invention, wherein a longitudinal extruding groove  113   c  is disposed at right joint for the internal flank  15   c  and top surface  11   c  while a tucked skirt  181  is disposed at the left flank  15   a  in left laterally adapted upper deck  10   c  (as shown in  FIG. 35 ); conversely, a longitudinal extruding wing  111   e  with two slant inwardly latching ribs  112   e  is disposed at left joint for the internal flank  15   e  and top surface  11   e  while a tucked skirt  181  is disposed at the right flank  15   a  in right laterally adapted upper deck  10   e  (not shown).  FIG. 36  is a cross sectional view showing assembly of one intermediately adapted upper deck and two laterally adapted upper deck with lower chassis in the first and second exemplary embodiments of the present invention. Via snugly mating between left longitudinal extruding wings  111   d  with two slant inwardly latching ribs  112   d  at left flank  15   d  of the intermediately adapted upper deck  10   d  in the first exemplary embodiment and right tucked flute  113   c  at right flank  15   c  of the laterally adapted upper deck  10   c  in the second exemplary embodiment (as indicated by left enlarged view shown in  FIG. 36 ) as well as via snugly mating between right longitudinal extruding grooves  113   d  at right flank  15   d  of the intermediately adapted upper deck  10   d  in the first exemplary embodiment and left longitudinal extruding wings  111   e  with two slant inwardly latching ribs  112   e  at left flank  15   e  of the laterally adapted upper deck  10   e  in the second exemplary embodiment (as indicated by right enlarged view shown in  FIG. 36 ), the latching strength between the lower chassis  20   a  and upper decks  10   c, d, e  is substantially enhanced (as shown in  FIG. 36 ) so that various floor covering areas in different shower room can be suitably fitted willfully at discretion of the user. 
       FIG. 37  is a cross sectional view for a serrated surface of the varied upper deck in the first exemplary embodiment of the present invention while  FIG. 38  is a cross sectional view for a serrated surface of the varied upper deck in the second exemplary embodiment of the present invention, wherein each top surface  11 ,  11   a  of each corresponding upper deck  10 ,  10   a  can be varied into serrated surface  114  respectively. With serrated surface  114  for each top surface  11 ,  11   a  of each corresponding upper deck  10 ,  10   a  of the present invention, even the upper deck  10 ,  10   a  of the present invention has same top encompassed area as that for the flat top surface  31  of the conventional upper deck  30 , the actual contacting area with dropped shower water for the creased top surface  11  of the present invention is considerably larger than that of the conventional flat top surface  11  for the conventional “heat exchanger for bathing shower” in publishing number of CN102478367 of Chinese Invention Patent so that “recovering rates for the residual heat in spent shower water” η of the present invention is essentially enhanced. 
     In conclusion all the disclosure heretofore, the simple structure with less fabricating process of the present can definitely reduce the manufacturing cost other than considerably energy-saving effect for the bathing water heater. For efficiency of the thermal energy exchange for bathing shower water, the “recovering rate for the residual heat in spent shower water” η of the present invention achieves over 50% other than that the consumed energy quantity of the electricity or gas for using “thermal energy exchanger for bathing shower water” of the present invention can be doubly reduced comparing to that for using conventional “heat exchanger for bathing shower” in publishing number of CN102478367 of Chinese Invention Patent. Thus, the present invention meets the basic criterion of patentability because it indeed has highly industrial utilization.

Technology Category: 4