A combined space conditioning or heating and fluid heating system includes a main fluid conductor having an inlet and an outlet; a single heating source configured for producing low and high temperature fluid outputs of a fluid input received at the main fluid conductor inlet; a coil comprising an inlet and an outlet; and a supplementary fluid conductor comprising a fluid mover and a directional valve, an inlet and an outlet. The inlet of the main fluid conductor is adapted for connection with the coil outlet. The high temperature fluid output is adapted for connection with the supplementary fluid conductor inlet, the supplementary fluid conductor outlet is adapted for connection with the coil inlet. The low temperature water output is adapted for connection with a fluid delivery point. The water coil inlet is adapted for connection with a raw fluid supply.

Aspects of a flow balanced frac tank farm are described herein. In one embodiment, the flow balanced frac tank farm includes at least one battery of frac tanks comprising a plurality of frac tank trailers, a header pipe arrangement, and at least one valve between one or more of the frac tank trailers and the header system. The header pipe arrangement may include a header supply pipe to supply water to individual ones of the plurality of frac tank trailers and a header discharge pipe to discharge water from individual ones of the plurality of frac tank trailers. The header pipe arrangement may be relied upon to help balance the flow of heated fluids among the frac tank trailers in frac tank farm.

A multi-temperature output fluid heating system including an input for receiving a fluid supply, a single heating source, a first output, a second output and a bypass path. The first output is fluidly connected to the input, where the first output is adapted for control by a first control device and to receive heat from the single heating source to achieve a first temperature at the first output. The bypass path fluidly connects the input and the second output. The input is adapted to empty a first portion of the fluid supply into the first output and a second portion of the input into the bypass path. The second output is adapted to receive an output from the first output and an output from the bypass path to achieve a second temperature.

The invention relates to an arrangement for heating a liquid. An energy unit (1) supplies a heat exchanger (2) with thermal energy. The heat exchanger (2) transfers the thermal energy to the liquid which is received by a container (3). The container (3) has an opening (21). A pump (20) is connected to the opening (21) of the container (3) and to the heat exchanger (2) so as to deliver liquid from the opening (21) and/or from the heat exchanger (2).

In a heat tracing system using heat from a radiant heater to heat a circulating fluid, thermoelectric generation modules are used to generate electricity for powering a circulating pump. Thermoelectric power generation modules are sandwiched between a heat-absorbing plate and a heat sink, and this assembly is positioned with the heat-absorbing plate adjacent to a radiant heater. A conduit loop passes through the heat sink, such that a fluid circulating through the conduit is heated from heat drawn from the heater into the heat sink. Due to the temperature differential between the hot and cold sides of the thermoelectric modules, the modules produce electricity to power the pump circulating the fluid through the conduit loop. Supplementary heat exchanger components may be provided for additional fluid-heating capacity, and thereby increasing the amount of heat available for the heat tracing loop.

A method of hydraulic fracturing of an oil producing formation includes the provision of a heating apparatus which is transportable and that has a vessel for containing water. The method contemplates heating the water up to a temperature of about 200 F. (93.3 C.). A water stream of cool or cold water is transmitted from a source to a mixer, the cool water stream being at ambient temperature. The mixer has an inlet that receives cool or cold water from the source and an outlet that enables a discharge of a mix of cool or cold water and the hot water. After mixing in the mixer, the water assumes a temperature that is suitable for mixing with chemicals that are used in the fracturing process, such as a temperature of about 40-120 F.+ (4.4-48.9 C.+). An outlet discharges a mix of the cool and hot water to surge tanks or to mixing tanks. In the mixing tanks, a proppant and an optional selected chemical or chemicals are added to the water which has been warmed. From the mixing tanks, the water with proppant and optional chemicals is injected into the well for part of the hydraulic fracturing operation. The mixer preferably employs lateral fittings that enable heated water to enter the mixer bore at an acute angle. The mixer can also provide a lateral fitting that exits the mixer bore upstream of the first lateral fitting, the second lateral fitting transmitting water via a conduit such as a hose to the heater.