Abstract: A control method includes, after a multi-split air conditioner starts to operate in a heating mode, determining a target room from a plurality of rooms for which the multi-split air conditioner provides air conditioning, obtaining an indoor temperature of the target room, determining whether the indoor temperature of the target room is greater than a target temperature corresponding to the target room, and, in response to a determination that the indoor temperature of the target room is greater than the target temperature, controlling the multi-split air conditioner to switch an operation mode of a target indoor unit corresponding to the target room from the heating mode to a cooling mode.

Abstract: Disclosed is a boiler for providing hot water to a heating system of a building and for simultaneously producing hot domestic water. This boiler comprises a heating tank provided with a water inlet and a water outlet through which water for use in the heating system circulates and an adjacent chamber annexed to the heating tank. This adjacent chamber is in direct communication with the heating tank and containing means for heating the water. The boiler also comprises a heat exchanger provided with a water inlet and a water outlet through which circulates the domestic water. This heat exchanger is made of a plurality of tubular coils of helicoidal shape that are located within the heating tank in order to allow heat transfer between the hot water within the heating tank and the domestic water that circulates within the tubular coils.

Abstract: Disclosed is an automatic switching two pipe hydronic system for conditioning a space. In one embodiment the two pipe hydronic system enables automatic switching from a first mode of operation to a second mode of operation or vice versa in a reduced span of time. The present invention saves fuel, energy and water, when there are lower load conditions that affect boilers, chillers, and cooling towers. In another embodiment, the present invention provides a system for simultaneously heating and cooling a first portion and a second portion of a space by utilizing a plurality of boilers, chillers, heat exchangers, condenser pumps and closed loop pumps by using a plurality of sensors indicating the temperatures inside and outside the space and a controlling module controlling the operation of the system. The present invention can be easily achieved by making minor configurational modifications to existing systems thereby increases system versatility.

Abstract: A heating system for heating a building with at least a first zone and a second to be heated. The heating system includes a first heating source and a second heating source. The heating system alternates between two modes of operation. In the first mode, heat is transferred to the first zone from the first heating source and heat is transferred to the second zone from the second heating source. In the second mode of operation, heat is transferred to the first zone from the second heating source and heat is transferred to the second zone from the first heat source. Each zone may comprise one or more areas of the building. Heat exchangers and thermostats positioned in each area control the amount of heat which is ultimately transferred into the areas.

Abstract: A secondary heating source is used to preheat the water supplied to a conventional hot water tank. Three two-position valves permit the water from the water supply line to be supplied directly to the hot water tank during part of the year (such as the winter), with the secondary heating source having its inlet and its outlet connected to a drain to drain all water from it so that it does not freeze in the winter. The second position of the three valves causes the water from the water supply line to be diverted through the secondary heat source prior to supplying it to the inlet of the hot water tank, so that supplemental preheating of the hot water is effected. Manually controlled valves are used to accomplish this purposes and each of them includes indicia on it to indicate the position of operation to simplify the change-over from the "summer" mode of operation to the "winter" mode of operation.

Abstract: Dual flow circuitry is utilized to transport fluid held in a tank through a heating means by providing means for carrying both inflow and outflow streams and means for depositing the inflowing stream at a predetermined level in the tank while utilizing only one tank opening. The dual flow circuitry can be used to supplement an ordinary residential or other hot water heating system with a heat pump.

Abstract: A steam generation apparatus includes a primary source of hot water supplied to an enclosed hot water receptacle maintained at a pressure of approximately 300 psi. Supply and return lines pump the hot water in a recirculating manner through a serially connected supplemental heating device until the hot water has reached a temperature of substantially 400.degree. F. whereupon a thermal valve associated with the supplemental heating device opens to deliver the heated water to an expansion tank. Steam formed within the expansion tank is transmitted through a steam outlet line to appropriate using apparatus. The initial hot water source may alternately include industrial by-product heated waste water on a primary heating station serially connected between a water supply and the enclosed hot water receptacle. Water condensed in the expansion tank is recycled to either the hot water receptacle or primary heating station.

Abstract: An auxiliary hot water boiler and heat exchange system including a solar heater and adapted for use with a conventional, domestic closed loop hot water heating system and a conventional, domestic hot water heater. A first heat exchanger connected with a solar heat absorber provides a primary source of heat for a supply of water in the boiler. A second heat exchanger provides preheated water for a hot water heater. Water in the boiler is directly fed to a conventional closed loop hot water heating system to provide preheated water therefor. A pair of fireboxes with their flues are arranged one above the other in the boiler and have their flues joined and projected through the top of the boiler. An additional flue is located within the boiler and has an external inlet for connection to an additional boiler. A third heat exchanger provides preheated water to the additional boiler.

Abstract: A very well heat insulated water storage or accumulator tank of relatively large capacity as compared to the capacity of the hot water heating unit is interposed between the unit and the radiator system and is interconnected with the unit. Heated water from the top portion of the tank is used to preheat the unit prior to actuation thereof, and mixed water above a given temperature is fed to the unit from the tank during actuation, such that the corrosive condensation on the heating surfaces of the heating unit, caused by heating a cold surface, is eliminated thereby extending the useful life of the unit. When the unit is actuated, heated water from the unit fills the tank from the top side until a volume of non-heated return water from the radiator system, approximately equal to the capacity of the unit, remains in the bottom of the tank.

Abstract: A very well heat insulated water storage or accumulator tank of relatively large capacity as compared to the capacity of the hot water heating unit is interposed between the unit and the radiator system and is interconnected with the unit. Heated water from the top portion of the tank is used to preheat the unit prior to actuation thereof, and mixed water above a given temperature is fed to the unit from the tank during actuation, such that the corrosive condensation on the heating surfaces of the heating unit, caused by heating a cold surface, is eliminated thereby extending the useful life of the unit. When the unit is actuated, heated water from the unit fills the tank from the top side until a volume of non-heated return water from the radiator system, approximately equal to the capacity of the unit, remains in the bottom of the tank.

Abstract: A heating system for heating a confined area with an open-hearth wood-burning fireplace. A fireplace jacket is provided which comprises a multi-chambered double-walled arrangement or a grate member. Log supporting portions of the jacket slant upward slightly in order to prevent a pinging sound by creating convectional force when water is circulating therethrough. The grate member includes first and second headers formed from prisms with triangular bases, and water conducting pipe portions extending on three sides of a fire burning in the open-hearth fireplace. The fireplace jacket is readily utilizable with a conventional forced-air furnace in association with a heat exchanger disposed in the furnace cold air return. Combustion air for the fire is provided from an area external of the confined area to be heated by the heating system.

Abstract: A standard hot water heating system is improved by adding a high-low temperature limit controlled auxiliary boiler. The auxiliary boiler is smaller than the main boiler and the burner for the auxiliary boiler is, of course, smaller than the burner for the main boiler and uses less fuel. In a particular embodiment, the auxiliary boiler continuously maintains the temperature in both boilers within the range of about 170.degree.-212.degree. F. As a result of the constantly maintained elevated water temperature in the main boiler, less time is required for the main boiler burner to heat up the system upon the demand of a room thermostat.

Abstract: A metal building with an integrated hot water heating system includes a heater for heating water, pipes connected between the heater and heating grids in the floor of the building and the structural columns and beams of the frame of the building for circulation of hot water through the frame and floor of the building to heat the building primarily with radiant energy, wherein a substantially uniform temperature is maintained throughout the building, and a savings of up to 70% in energy required to heat the building is realized.

Abstract: A heat generator of the type condensing the combustion products of a liquid or gaseous hydrogen fuel suitable for the heating of a heat-bearing fluid, including a tank containing at the top a zone of direct contact between the heat-bearing fluid and the combustion products, a collector for the heat-bearing fluid coming from the zone of direct contact, a convection heat exchanger arranged in the path of the combustion products, a combustion zone at a pressure close to atmospheric pressure, and a conduit which connects the collector of the heat-bearing fluid to the convection heat exchanger and is provided with a pump for replacing under pressure the portion of the heat-bearing fluid coming from the collector and intended to pass through the convection heat exchanger.

Abstract: A fireplace jacket assembly and heating system associated therewith. A fireplace jacket assembly including water chambers on five sides of an open wood-burning fireplace having means for providing water communication and circulation therebetween is placed in a conventional heating or hot water system. A pump circulates the water between the component parts of the system including a water storage tank and a radiator, and means are provided responsive to the temperature of water within the storage tank for preventing heating thereof by conventional (i.e., fossil fuel or electricity) means, or by a solar heating system. An opening formed in the bottom of the fireplace jacket provides for greater efficiency.