Abstract: An air-conditioning system includes an air conditioner, a heat source device, and a controller. In a case where an indoor temperature is a setting value, the controller performs a first adjustment operation including: transmitting a switching signal to the heat source device to instruct the heat source device to switch a setting water temperature to a first setting water temperature; and adjusting a temperature difference of heat-exchange water to a target water temperature difference. In a case where the indoor temperature is not the setting value, the controller performs a second adjustment operation including: transmitting a switching signal to the heat source device to instruct the heat source device to switch the setting water temperature to a second setting water temperature; and adjusting an air supply temperature of air-conditioning air to a setting air supply temperature.

Abstract: A heat pump air conditioner includes an intake side heat exchanger including heat transfer pipes passing a refrigerant and being arranged in a direction along an air inlet face, intake heat exchanger configured to cool or warm air and supply the air to a space. A plurality of heat pumps include a plurality of compressors and configured to compress the refrigerant and supply the compressed refrigerant to the heat transfer pipes and a plurality of heat side exchangers and connected to the respective compressors, the heat pumps sharing the air intake side heat exchanger, and a controller configured to switch a state of the compressors and between an operating state and an operation stopped state. The controller controls the compressors and to switch an operation of each of the compressors and between starting and stopping in accordance with a magnitude of an air-conditioning load.

Abstract: In an induction emission air conditioning apparatus installed in a ceiling, it is provided within a casing with a heat exchanger through which a feed air introduced from an outdoor side passes, a fan passing the feed air through the air conditioning heat exchanger, and a heating and cooling unit 1 for blowing a mixed air obtained by inducing and suctioning the air in the room inside by using the feed air passing through the heat exchanger so as to mix with the feed air, into the room inside in a laminar manner, and emitting the heat of the mixed air to the room inside, integrally.

Abstract: A flow control valve, which supports a valve body movably to a valve shaft suported movably in a valve chamber, is provided at the valve shaft with flow grooves for allowing a fluid to flow therethrough even when the valve body operates for closing and a sealing member which closes the flow grooves when the valve shaft is further moved with respect to the valve body in condition of closing operation, thereby enabling a fluid passage to be open or closed in two steps.