Heating and hot water supply apparatus

Abstract

A heating and hot water supply apparatus is provided with a heat pump unit ( 2 ), a water storage tank ( 1 ), a heat exchanger ( 10 ) in the water tank and pipe lines ( 31, 32 ). Hot water stored in the water storage tank ( 1 ) by being guided by the pipe line ( 32 ) passes through a radiator ( 30 ) outside the water storage tank ( 1 ), then returns into the storage tank ( 1 ) by being guided by the pipe line ( 31 ) for circulation. Thus, the radiator ( 30 ) can directly use heat of large quantity hot water stored in the water storage tank ( 1 ).

1 . A heating and hot water supply apparatus comprising:
 a heat pump unit;   a hot water tank for storing therein hot water heated by the heat pump unit;   an in-tank heat exchanger placed in the hot water tank and arranged and configured such that supply hot water flows through an interior of the in-tank heat exchanger; and   circulation circuits for circulating the hot water stored in the hot water tank such that the hot water passes through a heating terminal outside the hot water tank and thereafter returns into the hot water tank.   
   
   
       2 . The heating and hot water supply apparatus as claimed in  claim 1 , wherein
 the hot water tank is a cylindrical-shaped member and an aspect ratio (H/D) of the hot water tank, which is a ratio of an inner height (H) to an inner diameter (D) of the hot water tank, is 4.0 or more.   
   
   
       3 . The heating and hot water supply apparatus as claimed in  claim 1 , wherein
 the in-tank heat exchanger is so arranged and configured that temperature of stored water (W 1 ) stored in the hot water tank, which temperature varies due to heat exchange between the stored water (W 1 ) and flow-through water (W 2 ) flowing through the interior of the in-tank heat exchanger, is lower in a lower side in the hot water tank and higher in an upper side in the hot water tank.   
   
   
       4 . The heating and hot water supply apparatus as claimed in  claim 3 , wherein
 the in-tank heat exchanger is formed of a tubular member, and a lower-side portion of the in-tank heat exchanger is smaller in tubular inner diameter than an upper-side portion of the in-tank heat exchanger and an in-tube water flow velocity of the lower-side portion is higher than an in-tube water flow velocity of the upper-side portion.   
   
   
       5 . The heating and hot water supply apparatus as claimed in  claim 3  wherein
 a lower-side portion of the in-tank heat exchanger is formed of an internally grooved tube.   
   
   
       6 . The heating and hot water supply apparatus as claimed in  claim 3 , wherein
 the in-tank heat exchanger is formed of a coiled tubular member, and a coil density of a lower-side portion of the in-tank heat exchanger is higher than a coil density of an upper-side portion of the in-tank heat exchanger.   
   
   
       7 . The heating and hot water supply apparatus as claimed in  claim 3 , wherein
 the in-tank heat exchanger is formed of a coiled tubular member, and a portion of the coiled tubular member is formed into a spiral shape in a vertical direction, the spiral shape having a height difference smaller than a tubular outer diameter, such that the spiral shape portion serves as a resistive member against vertical flow of the stored water (W 1 ) stored in the hot water tank.   
   
   
       8 . The heating and hot water supply apparatus as claimed in  claim 1 , wherein
 a baffle member for restricting vertical water flow in the hot water tank is provided at an intermediate height position higher than an opening for a lower-position side water pipe in the hot water tank.   
   
   
       9 . The heating and hot water supply apparatus as claimed in  claim 8 , wherein
 the baffle member comprises a transverse plate member for vertically dividing an internal space of the hot water tank.   
   
   
       10 . The heating and hot water supply apparatus as claimed in  claim 8 , wherein
 the baffle member comprises a vertical plate member for diametrally dividing an internal space of the hot water tank.   
   
   
       11 . The heating and hot water supply apparatus as claimed in  claim 8 , wherein
 the baffle member comprises a transverse plate member for vertically dividing an internal space of the hot water tank and a vertical plate member for diametrally dividing the internal space of the hot water tank.