Abstract: A chlorinator includes an electrode assembly and a housing. The housing includes a first water flow opening, a second water flow opening, an electrolysis chamber for accommodating the electrode assembly, a sampling chamber for selectively enabling sampling of water entering the housing in operation of the chlorinator, and a flow stream separator. The flow stream separator includes a partition wall axially extending between a first partition edge and a second partition edge. The partition wall separates the housing internal volume into a main channel and an auxiliary channel. The main channel extends axially between the first partition edge and the second partition edge, and wholly accommodates therein the electrolysis chamber on a first side of the partition wall. The auxiliary channel extends axially between the first partition edge and the second partition edge and wholly accommodates therein the sampling chamber on a second side of the partition wall.

Abstract: A module for constructing therefrom a heat exchanger is provided. The module includes two manifolds and a plurality of parallelly arranged mats spanning between the manifolds. Each mat includes a plurality of heat exchange tubes arranged so as to define a plane, the heat exchange tubes being in fluid communication with the manifolds and spanning therebetween. Each of the manifolds includes selectively sealable end openings formed in facing ends thereof and defining a longitudinal flow path substantially perpendicular to the tubes and parallel with the planes defined thereby. Each of the manifolds further includes selectively sealable side openings on facing sides thereof and each defining a lateral flow path substantially perpendicular to the longitudinal flow path and to the planes defined by the tubes.

Abstract: A chlorinator configured to produce one or more sanitizing agents from a solute dissolved in water is provided. The chlorinator comprises an operational unit defining an electrolysis chamber for flow therethrough of the water, electrolyzing electrodes for the electrolysis, and a control unit having a housing containing therewithin a chlorinator controller for directing operation of the electrolyzing electrodes. The chlorinator further comprises an electronic flow sensor comprising a pair of spaced-apart sensing electrodes projecting into the electrolysis chamber, and a circuit closeable by electrically connecting the sensing electrodes. The electronic flow sensor is configured to detect a flow condition when the circuit is closed, and to detect a non-flow condition when the circuit remains open.

Abstract: A solar water-heating panel is provided, comprising a plurality of risers configured for utilizing solar radiation impinging thereon to heat a fluid therein. Each riser comprises a riser wall defining a fluid path for flow therethrough of the fluid. The panel further comprises one or more headers for facilitating delivery of the fluid between the panel and an external source of the fluid. The risers are parallely-arranged and separate from one another, and each comprises a longitudinal fin projecting sidewardly therefrom toward, and contacting, an adjacent riser.

Abstract: A chlorinator configured to produce one or more sanitizing agents from a solute dissolved in water is provided. The chlorinator comprises an operational unit defining an electrolysis chamber for flow therethrough of the water, electrolyzing electrodes for the electrolysis, and a control unit having a housing containing therewithin a chlorinator controller for directing operation of the electrolyzing electrodes. The chlorinator further comprises an electronic flow sensor comprising a pair of spaced-apart sensing electrodes projecting into the electrolysis chamber, and a circuit closeable by electrically connecting the sensing electrodes. The electronic flow sensor is configured to detect a flow condition when the circuit is closed, and to detect a non-flow condition when the circuit remains open.

Abstract: A chlorinator configured to produce one or more sanitizing agents from a solute dissolved in water is provided. The chlorinator comprises an operational unit defining an electrolysis chamber for flow therethrough of the water, electrolyzing electrodes for the electrolysis, and a control unit having a housing containing therewithin a chlorinator controller for directing operation of the electrolyzing electrodes. The chlorinator further comprises an electronic flow sensor comprising a pair of spaced-apart sensing electrodes projecting into the electrolysis chamber, and a circuit closeable by electrically connecting the sensing electrodes. The electronic flow sensor is configured to detect a flow condition when the circuit is closed, and to detect a non-flow condition when the circuit remains open.

Abstract: A solar collector has first and second manifolds and tubes that provide fluid communication between the manifolds. An enclosure of the collector extends between first and second ends thereof that are respectively proximal to the first and second manifolds, and the tubes extend out of the enclosure at the first and second ends passed a seal at each end to connect to the first and second manifolds.

Abstract: A solar collector has first and second manifolds and tubes that provide fluid communication between the manifolds. An enclosure of the collector extends between first and second ends thereof that are respectively proximal to the first and second manifolds, and the tubes extend out of the enclosure at the first and second ends passed a seal at each end to connect to the first and second manifolds.

Abstract: A heat exchanger includes a manifold and a tube array. The manifold has an internal void and walls that surround the void and merge one with the other via corners. Each wall has a middle portion that is located mid way between the corners merging with the wall and the manifold branches off to attach and communicate with the tube array at a location aside of the middle portion of one of the walls towards a corner that merges with the wall.

Abstract: A solar collector includes an enclosure having a bottom and side wall surfaces substantially made of plastic material and a transparent top surface. At least one panel unit is composed of elongated conduits interconnected at each end by a manifold and is movably affixed inside the enclosure and sized to freely expand and contract therein due to thermal changes. The enclosure has at least one controllable air vent mechanism responsive to expansion and contraction of the panel unit.

Abstract: There is provided a connecting clasp for joining adjacing modular units of a solar collector mounted on roofs or other surfaces, including two substantially upright walls defining between them a space of a width capable of accommodating the end portions of spacer bars of the solar collector and a plurality of catches with inwards and downwards inclined top faces projecting from inside faces of the two upright walls. By application of force to a spacer bar seatable on the upper edges of the top faces of the catches, the upright walls are spread apart, letting the spacer bars enter the space until the catches snap into recesses provided in the spacer bars, thereby locking the clasp into position.