A flash water heater using a heat pump includes a heat exchanger in which a refrigerant flow path exchanges heat with a water flow path. Tap water is led directly to the water flow path, and hot water supplied from the water flow path is used. The water heater includes at least one of the following elements: 1) a load setter for setting a heating amount in the heat exchanger, and a heating controller for regulating a heating amount in response to an amount set by the load setter; 2) a heater for heating water flowing through the water flow path in the heat exchanger and water flowing the path before and after the heat exchanger; 3) plural compressors; and 4) plural heat-pump cycles. The water heater is excellent in start-up of hot water temperature when the hot water supply starts, controllability, and efficiency.

Heat pump water heater

A refrigerating cycle device using carbon dioxide as refrigerant capable of solving such a problem that when a receiver is installed against a low pressure, a cost and a volume are increased by a pressure resistant design to assure safety, wherein a first pressure reducing device (12) and a second pressure reducing device (15) are operated to vary the refrigerant pressure of a first heat exchanger (13) so as to regulate the refrigerant hold amount of the first heat exchanger, whereby since the unbalance of the amount of refrigerant between cooling and heating/dehumidifying can be reduced, the refrigerating cycle device can be efficiently operated with a downsized receiver or without installing the receiver.

Refrigerating cycle device

In a heat exchanger for exchanging heat between a fluid, such as a refrigerant, and air, an object is to increase the surface areas of the fins while suppressing an increase in draft resistance, so as to attain the improvement of performance. To this end, corrugated sheet fins (70) are used as the fins of a heat exchanger (60). The fins (70) are shaped in corrugated form, and the direction of their edge lines is orthogonal to the leading edge and trailing edge. In the heat exchanger (60), a plurality of corrugated sheet fins (70) are disposed at a fixed pitch axially of heat transmission pipes (61).

Heat exchanger, and air conditioner

A line pressure control system for an automatic transmission including a multiple shift stage transmission gear mechanism having a plurality of power transmitting paths of different speed ratios, line pressure control device for controlling a line pressure for frictional elements of the transmission gear mechanism associated with each other to establish a desirable shift gear stage, shift period detecting means for detecting a time period for a shift operation accomplished in terms of operation of the frictional element controlled by the line pressure, first compensating device for controlling the line pressure in terms of a learning control in a manner that the time period for the shift operation is controlled to a target value, abnormality detecting device for detecting an abrupt change such as turbine speed raising, depression or driving torque depression in operating condition of the transmission, and second compensating device for compensating the line pressure prior to compensation of the line pressure by the first compensating means when the abrupt change is detected. The torque shock can be effectively obviated during shift operation.

Line pressure control system for automatic transmission

An orthotic device (10) is provided, including an orthosis body (12) adapted to be wrapped around the torso of a wearer of the device, the orthosis body (12) having at least two segments (12a, 12b) in juxtaposed relationship. Means (16b, 16c) are provided at free end (14a, 14b) portions of at least two segments (12a, 12b) to releasably secure the free end portions to one another. At least two cables (28) are provided, each cable (28) operatively connected to at least two segments (12a, 12b). At least two sets of pulleys (22a, 22b, 24a, 24b) are mounted on the at least two segments (12a, 12b) with each cable (28) operatively connected to at least two segments (12a, 12b) running through a pulley (22a, 22b, 24a, 24b) on each of the at least two segments (12a, 12b) in alteration, shortening of each cable (28) by pulling at least two segments (12a, 12b) together and tightening the orthotic device (10).

Custom fitted orthotic device

A finned heat exchanger includes a plurality of elongated fins which are arranged at a predetermined interval in parallel with one another such that air flows between neighboring ones of the fins in a predetermined direction. A plurality of heat transfer tubes which contain refrigerant passing therethrough are orthogonally inserted through the fins so as to be arranged in a plurality of columns on the fins. When the finned heat exchanger is operated for condensation, the heat transfer tubes are provided in two paths in the vicinity of an inlet for the refrigerant and are provided in one path in the vicinity of an outlet for the refrigerant, such that the heat transfer tubes of the one path occupy about 5 to 30% of all the heat transfer tubes.

Finned heat exchanger

In an apparatus having a refrigeration cycle, the refrigeration cycle is formed by annularly connecting a compressor, a condenser, an expansion device and an evaporator with one another, the apparatus uses propane, isobutane or ethane as a refrigerant, and uses refrigerating machine oil having less mutual solubility with the refrigerant, and a dryer is provided in the refrigeration cycle for absorbing water. In stead of the dryer, an additive which reacts with water may be included in said refrigerating machine oil. With this arrangement, the amount of the refrigerant can be reduced, and the long term reliability of the apparatus can be obtained.

Apparatus having refrigeration cycle

A groove configuration, formed on an inside wall of a heat exchanger tube, has a cross-sectional area varying in the longitudinal direction of the heat exchanger tube. An increased rate of the cross-sectional area is differentiated from a decreased rate of the cross-sectional area by changing the height or top width of a protruding portion, or the depth or bottom width of a recessed portion.

Heat exchanger tube for an air-conditioning apparatus

of EP1041347A connecting apparatus for installing an air conditioner comprises a first connecting port connected to a refrigerant charge port of a pipe connecting valve body provided in an outdoor unit of the air conditioner, and a second connecting port connected to a replacing gas charging container for installing the air conditioner, replacing gas in the replacing gas charging container being allowed to flow from the refrigerant charge port, wherein the first connecting port includes a first connecting portion capable of being connected to the refrigerant charge port, the second connecting port includes a second connecting portion capable of being connected to the replacing gas charging container, the refrigerant charge port is opened by connecting the first connecting port and the refrigerant charge port to each other by the first connecting portion, and the refrigerant charge port is opened by connecting the second connecting portion and the replacing gas charging container to each other by the second connecting portion. With this structure, after air in the indoor unit heat exchanger or the connecting pipe is once replaced by the replacing gas, the replacing gas can easily be collected.

Method for installing an air conditioner

PURPOSE: To increase a pressure loss in a heat exchanger tube during the evaporation while restricting it during the condensation by a method a sectional area of the tube as cut at the right angle to the center line thereof has a part increasing or decreasing longitudinally and a section varied in the degree of increase and decrease CONSTITUTION: A section of a heat exchanger tube as cut at the right angle to the center line 145 of a groove part thereof is expanded in area gradually in the longitudinal direction at a slope 144a inclined gently of a ridge part, a side 142 inclined gently of the ridge part and a slope 143 inclined gently of a valley part and is decreased in area sharply with a slope 144b inclined sharply of the ridge part and the valley part As a result, regarding a pressure loss in the pipe, a fluid flowing through the tube during the evaporation has a disturbed flow thereof caused by the steep slopes 144b of the ridge part and the valley part to increase a resistance On the other hand, the fluid during the condensation has a reduced disturbance of the flow caused by the gentle slope 144a of the ridge part, the gentle side 142 of the ridge part and the gentle slope 143 of the valley part thereby enabling restricting of increase in resistance

Hitoshi Motegi

Papers

Finned heat exchanger

Apparatus having refrigeration cycle

Heat exchanger tube for an air-conditioning apparatus

Method for installing an air conditioner

Heat exchanger tube