Abstract: A concrete production apparatus produces concrete within a selected temperature range. Ground water is circulated through a heat exchanger in the apparatus to provide a heat source or a heat dump. Concrete water is circulated through another heat exchanger and is heated or cooled to a predetermined temperature. The concrete water at the predetermined temperature is mixed with cement and aggregate to produce a concrete mix within the selected temperature range.

Abstract: Modular apparatus for providing heating and cooling to large quantities of water used in a concrete batch plant prior to mixing water and concrete is disclosed. The system typically operates from a water source such as a deep well (10) which water source may serve as either a heat sink or a heat source. In addition, there is a water storage tank (34) which holds water (36) which water can be either heated or cooled as necessary for the best results in mixing concrete. There is a multiplicity (26) of modular reversable heat pumps each of which has its heat exchanger (78, 88) connected in parallel such that modular units may be added or removed without destroying the integrity of the refrigerant system. Each of the modular units includes a source heat exchanger (88) and a storage heat exchanger (78).