The present invention relates to a cold water mat
system using heat pipes. A first fluid circulating through the mat absorbs the user's body heat and transfers it to a
water block, and the
heat pipe transfers that heat to a heat dissipation member coupled to a heat dissipation section, thereby releasing it to the outside. In one embodiment, an
evaporation medium disposed adjacent to the heat dissipation member evaporates a second fluid physically separated from the first fluid, and cools the heat dissipation member and the heat dissipation section of the
heat pipe using the
latent heat of
evaporation, thereby achieving cooling lower than the external
air temperature. At this time, the heat dissipation member responsible for
heat transfer and the
evaporation medium responsible for evaporation are separated by function and optimized using low-cost materials for each; the evaporation medium may be a
cellulose pad, porous
ceramic, etc., and may be configured as a replaceable cassette. The second fluid that has not evaporated is recovered from a
water reservoir and recirculated. If necessary, the
lower limit of evaporative cooling can be supplemented by an auxiliary cooling element made of a
thermoelectric element, a
magneto-thermal element, or an elastic-thermal
shape memory alloy. The circulating water in contact with the user is isolated from the outside air for
hygiene, operates with low
power consumption without a compressor or active
refrigeration element, and the
control unit actively variably controls the fluid transfer means according to temperature and
humidity.