A waste-heat recovery system includes a waste-heat-recovery heat a tank, a circulation circuit, a circulation pump, and a control device that is configured to obtain the temperature of the heat medium flowing through a heat medium outlet piping of the circulation circuit and the temperature of the water stored in the tank. The control device stops the circulation pump or reduces the rotational frequency thereof in a case where the temperature of the heat medium flowing through the heat medium outlet piping is lower, or lower by a predetermined temperature or more, than the temperature of the water.

A method for operating a humidifier coupled to a gas flow generator. The humidifier has a pump providing a supply of water to a heater plate. The method includes: providing power to the gas flow generator; raising the temperature of the heater plate from an ambient temperature to about a first predetermined temperature; powering the pump at about a predetermined first duty cycle; monitoring the temperature of the heater plate until one of: a drop in temperature is detected, or a predetermined period of time has elapsed; and one of: increasing the duty cycle of the pump if the drop in temperature is detected, or turning off the pump if the predetermined period of time has elapsed.

A system that can eliminate engine combustion emissions in addition to raw and fugitive methane emissions associated with a gas compressor package. The system may comprise an air system for starting and instrumentation air supply; electrically operated engine pre/post-lube pump, compressor pre-lube pump, and cooler louver actuators; compressor distance piece and pressure packing recovery system; blow-down recovery system; engine crankcase vent recovery system; a methane leak detection system; and an overall remote monitoring system.

A system that can eliminate engine combustion emissions in addition to raw and fugitive methane emissions associated with a gas compressor package. The system may comprise an air system for starting and instrumentation air supply; electrically operated engine pre/post-lube pump, compressor pre-lube pump, and cooler louver actuators; compressor distance piece and pressure packing recovery system; blow-down recovery system; engine crankcase vent recovery system; a methane leak detection system; and an overall remote monitoring system.

An analysis method of absolute energy efficiency and relative energy efficiency of the compressed air system. For the compressed air system operating in a form of a single compressor, a gas flow rate and a corresponding operating power of the compressor operating in the single compressor model are measured under a specified flow rate. Meanwhile, influencing factors of the compressor operation are monitored. The absolute energy efficiency of the compressor is defined, and a curve of the absolute energy efficiency of the compressor varying with the operating time versus the above factors are plotted in a same coordinate system. Obtaining absolute energy efficiency data of the compressor in a corresponding state. By analyzing the absolute energy efficiency under corresponding conditions and based on the corresponding chart, the actual unit consumption of a given single compressor and its changing rule under different production and environmental operating conditions can be intuitively analyzed.

A method of driving a pump is used in a pressure-applying apparatus, the apparatus including a flow passage, a pump configured to impart pressure into the flow passage, an opening and closing valve configured to open and close the flow passage, a pressure detector configured to detect pressure in the flow passage, and an atmospheric air open valve configured to open an interior of the flow passage to atmospheric air. The method includes driving the pump after closing the opening and closing valve and opening the atmospheric air open valve, and evaluating a state of the pump, based on one of: the pressure detected by the pressure detector at a time at which a predetermined time period has elapsed after closing the atmospheric air open valve, and a time from closing of the atmospheric air open valve until detection of a predetermined pressure by the pressure detector.

A method of driving a pump is used in a pressure-applying apparatus, the apparatus including a flow passage, a pump configured to impart pressure into the flow passage, an opening and closing valve configured to open and close the flow passage, a pressure detector configured to detect pressure in the flow passage, and an atmospheric air open valve configured to open an interior of the flow passage to atmospheric air. The method includes driving the pump after closing the opening and closing valve and opening the atmospheric air open valve, and evaluating a state of the pump, based on one of: the pressure detected by the pressure detector at a time at which a predetermined time period has elapsed after closing the atmospheric air open valve, and a time from closing of the atmospheric air open valve until detection of a predetermined pressure by the pressure detector.

A noise reduction device of compressor for gas is arranged at the inlet end of the compressor. The noise reduction device includes a noise reduction gas return housing and a plurality of gas inlet small pipes, gas inlet large pipes, gas return large pipes, and gas return small pipes, respectively arranged in the noise reduction gas return housing. The design and arrangement that the gas inlet large pipes and the gas return large pipes are respectively sleeved on the gas inlet small pipes and the gas return small pipes changes the moving path of the gas in the noise reduction gas return housing in an instantaneously reverse manner. Such moving path change mainly reduces the flow rate of the gas, so that the noise generated by the gas can be effectively reduced.

A noise reduction device of compressor for gas is arranged at the inlet end of the compressor. The noise reduction device includes a noise reduction gas return housing and a plurality of gas inlet small pipes, gas inlet large pipes, gas return large pipes, and gas return small pipes, respectively arranged in the noise reduction gas return housing. The design and arrangement that the gas inlet large pipes and the gas return large pipes are respectively sleeved on the gas inlet small pipes and the gas return small pipes changes the moving path of the gas in the noise reduction gas return housing in an instantaneously reverse manner. Such moving path change mainly reduces the flow rate of the gas, so that the noise generated by the gas can be effectively reduced.

The present invention relates to an inflatable tandem surf bodyboard, methods of making, and a kit that includes a tandem surf bodyboard, an air pump, a maintenance kit, and a carry bag. The tandem surf bodyboard can accommodate more than one rider, allowing two riders to share and surf a wave. The inflatable tandem surf bodyboard comprises a base that is cut into the shape of a surf bodyboard, a base fabric layer applied over the base, an intermediate portion material that forms an air chamber, an upper layer that is fastened to the intermediate portion material, a deck pad layer that is applied over the upper layer, a first rail layer that is applied around the perimeter of the surf bodyboard sealing the edges, and a second rail layer that is applied over the first rail layer. An air inlet allows the tandem surf bodyboard to be inflated.