Mitsubishi Electric Corporation

Kei Takeyama

Kazutaka Suzuki

Hirokazu Minamisako

Taro Hattori

Jun Yoshida

Koji Matsuzawa

Takuya Suenaga

When hot water supply and room heating are requested simultaneously, a hot water supply operation, by which energy saving is achieved without impairing the comfortability in a room, is performed. A heat-pump apparatus of a variable operation capacity type, a primary water circuit, a hot water tank, a room heater, and a controller are provided. The controller sets a hot water supply operation completion target time in the case of a requests for a simultaneous hot water supply and room heating operation, based on a temperature difference between the outdoor air temperature and the indoor temperature, and determines the rotation speed of the compressor in the hot water supply operation completion target time set.

Heat-pump equipment

An indirect-heating hot water apparatus is designed to correctly detect clogging in a secondary water circuit at low costs. A hot water apparatus is provided with: a primary water circuit in which water heated by absorbing heat from a refrigerant at a heat exchanger circulates; a secondary water circuit connected to the primary water circuit via a heat exchanger, in which water circulates; and a tank connected to the secondary water circuit, in which the water circulating in the secondary water circuit is stored. The hot water apparatus detects the temperature of the water circulating in the primary water circuit and the temperature of the water stored in the tank. When the temperature of the water circulating in the primary water circuit is at or above a first threshold and the temperature of the water stored in the tank is at or below a second threshold, the hot water apparatus issues a notification indicating that the secondary water circuit is clogged.

Hot water apparatus and failure notification method for hot water apparatus

In a heating medium utilizing apparatus utilizing heating medium heated by a heating device, it is aimed to provide a pipe which achieves both of the strength of a connection part to an external pipe and the ease of pipe layout without increasing a manufacturing time. On a tip portion of an internal pipe through which the heating medium or fluid to be heat-exchanged with the heating medium flows, a pipe expanding process to expand a pipe diameter and a pipe shrinking process to shrink the pipe diameter are carried out, thereby forming the connection part to be connected to the external pipe connected to external equipment by work hardening.

Heating medium utilizing apparatus

[Solution] A metal cylindrical tank legforming an opening in a portion opposite to the lower end plateis provided on the lower end plateof the hot water storage tank, a plurality of metal L-shaped tank legsone edgeof each of which extends outwardly are provided on the outer peripheral surface of the cylindrical tank legand arrayed in a circumferential direction thereof, a base plate made of a metal is fixed to the second tank legs; and the cylindrical tank legand the L-shaped tank legsare fixed to a base platewith a base heat insulatorhaving an electrical insulation property and elasticity interposed therebetween. Part of the lower end platelocated within the opening of the cylindrical tank legis covered by an end plate heat insulator

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Tokyo, Japan

Kei Takeyama