Highly effective energy-conserving domestic short tube type rapid water heater

Abstract

The invention provides an efficient energy-saving household short-pipe type rapid water heater, which has a water jacket consisting of a shell and a liner. The water heater is characterized in that a plurality of water isolating rings are arranged in an interlayer of the water jacket, so as to divide the interlayer of the water jacket into a plurality of layers of water flow channels from top to bottom; a plurality of water pipes are arranged on the liner; and the water pipes communicate all layers of water flow channels of the water jacket together. The water heater has the advantages that the water heater changes the combustion and heat exchange modes of the prior household gas rapid water heater, is sufficient in the combustion of flammable substances and little in the loss of chemical incomplete combustion, increases convection heating surface and radiant heating surface, ensures that water flow in a heater exchanger is always in the states of violent vortexes and turbulent flow, raises convective heat exchange coefficient, and is fast in water temperature rise, high in water yield, high in effluent temperature, large in radiant heating surface, high in the radiation angle factors and blackness of the walls of the liner and the water pipes, high in radiant heat absorption, little in radiant heat reflection, little in smoke discharge loss, high in efficiency, wide in application range, wide in fuel choice range and low in operation cost.

Description

technical field [0001] The invention belongs to a heat exchange device, in particular to a high-efficiency and energy-saving domestic short-tube instant water heater. Background technique [0002] Thermal efficiency is an important energy efficiency index for household gas instant water heaters. Using thermal efficiency to measure the percentage of energy effectively used by thermal equipment and input energy does not take into account the difference in energy quality, so it often cannot reflect the perfection of the device. " "It is a new term that appeared in the field of thermodynamics and energy science in the 1970s, and some people call it available energy or effective energy. It is a parameter derived by combining the first law of thermodynamics and the second law, and the unit is kcal / kg. As a physical quantity to evaluate the value of energy, it evaluates the value of energy from the combination of quantity and quality, and reveals the essence of energy deterio...

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Problems solved by technology

2. Due to the short distance between the burner and the heat exchanger, the space is small, and the conditions for full combustion of the fuel are poor, so part of the chemical energy is caused by incomplete combustion heat loss, that is, a certain combustion loss

The total radiation angle coefficient of the water pipe wall is small, that is, the radiation heat directly irradiated to its surface is small, so the total radiation heat transfer coefficient of the heat exchanger is small, and the heat exchange process is very short, and the heat exchange is not sufficient. Therefore, the heat transfer big loss

4. The convective heating area of ​​the heat exchanger is very small, and the water pipe has a small diameter and many hard bends. Due to the certain viscosity of the water, a certain thickness of laminar boundary layer thermal resistance will inevitably be generated on the inner wall of the water pipe, and The heat conductivity and temperature conductivity coefficient of water are very low, so its convective heat transfer coefficient is low, and the heat transfer coefficient is low. big loss

5. The heat dissipation loss on the wall of the combustion chamber is relatively large, which is also One reason for the inefficiency

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