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The CLTD/CLF/SCL (cooling load temperature difference/cooling load factor/solar cooling load factor) cooling load calculation method was first introduced in the 1979 ASHRAE Cooling and Heating Load Manual (GRP-158) [1] The CLTD/CLF/SCL Method is regarded as a reasonably accurate approximation of the total heat gains through a building envelope ...
These calculations formulate a Basis of Estimate which is, when completed, a number that can be used to determine the ability of the firm or company to carry out the project, or used as a tool in competing for a contract bid or otherwise proposing the project to another.
In thermal engineering, the logarithmic mean temperature difference (LMTD) is used to determine the temperature driving force for heat transfer in flow systems, most notably in heat exchangers. The LMTD is a logarithmic average of the temperature difference between the hot and cold feeds at each end of the double pipe exchanger.
Service parts pricing refers to the aspect of service lifecycle management that deals with setting prices for service parts in the after-sales market. Like other streams of pricing , service parts pricing is a scientific pursuit aimed at aligning service part prices internally to be logical and consistent, and at the same time aligning them ...
The coefficient of performance or COP (sometimes CP or CoP) of a heat pump, refrigerator or air conditioning system is a ratio of useful heating or cooling provided to work (energy) required. [1] [2] Higher COPs equate to higher efficiency, lower energy (power) consumption and thus lower operating costs. The COP is used in thermodynamics.
HVAC (heating, ventilation, and air conditioning) is a major sub discipline of mechanical engineering. The goal of HVAC design is to balance indoor environmental comfort with other factors such as installation cost, ease of maintenance, and energy efficiency. The discipline of HVAC includes a large number of specialized terms and acronyms, many ...
Labor costs are direct costs, that is, they can be identified among the total cost and assigned to a certain cost objective. [1] Labor costs are defined by categories (e.g. service labor or manufacturing labor), the attribution of a labor rate for each category, and a certain number of labor hours. [1]
The affinity laws (also known as the "Fan Laws" or "Pump Laws") for pumps/fans are used in hydraulics, hydronics and/or HVAC to express the relationship between variables involved in pump or fan performance (such as head, volumetric flow rate, shaft speed) and power. They apply to pumps, fans, and hydraulic turbines. In these rotary implements ...
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