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Chapter 27: Problem 4

Explain the behavior of a demand meter.

Short Answer

Expert verified
A demand meter is an electrical device that measures the maximum load or demand of electrical power consumed by a consumer over a specified time interval. It consists of multiple measuring units, such as kilowatt-hour meters and an integrating time switch. The meter measures the power consumption in kilowatts (kW) during the specified time interval and records the maximum demand. This data is then used by utility companies for demand management, fair billing practices, and energy-saving measures. The demand meter helps utilities to plan their generation and distribution infrastructure and allows customers to effectively manage energy consumption.

Step by step solution

01

1. Introduction to Demand Meter

: A demand meter is an electrical device that measures the maximum load or demand of electrical power consumed by a consumer over a specified time interval. It consists of multiple measuring units, such as kilowatt-hour meters and an integrating time switch. The demand meter helps utilities to plan their generation and distribution infrastructure and charge customers based on their peak usage.
02

2. Components of a Demand Meter

: A demand meter consists of the following components: a) Kilowatt-hour (kWh) Meter: A kWh meter measures the energy consumed over time, in kilowatt-hours. It typically has a rotating disc or an LED indicator to show the energy consumption. b) Integrating Time Switch: This is an essential component of a demand meter that records the time during which the maximum demand occurs. It measures the demand in kilowatts (kW) over a specific time interval, usually 15, 30, or 60 minutes. c) Recorder and Indicator: This component records the data from the kWh meter and the integrating time switch and displays the maximum demand over the integrated time period.
03

3. How a Demand Meter Works

: During the specified time interval, the demand meter measures the power consumption in kilowatts (kW) and records the maximum demand. It then resets at the end of that interval and starts monitoring the usage again. This procedure continues in a cyclic manner. The meter records the maximum electrical power consumed during the selected time frame and stores this data to be utilized by utility companies for billing and infrastructure planning purposes.
04

4. Importance of Demand Meters

: Demand meters help utility companies in various ways: a) Demand Management: Identifying peak loads allows utility companies to better manage their generation and distribution systems by predicting demand patterns. b) Fair Billing: Customers who use more power during peak hours impose a greater burden on the system and can be billed accordingly, leading to fairer pricing structures. c) Energy Saving Measures: By monitoring peak demand, customers can identify areas of high consumption and implement measures to reduce overall energy usage and costs. In conclusion, a demand meter is an essential tool for both utility companies and customers to effectively manage energy consumption. The demand meter records the maximum power consumed over a specified time interval, allowing for better load management, fair billing practices, and the implementation of energy-saving measures.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Electrical Power Consumption
Understanding how much electricity we use, often measured in the unit kilowatt-hours (kWh), is essential to managing our resources and costs effectively.

For instance, in a household, every appliance consumes electricity at a rate measured in watts. By converting watts to kilowatts (1 kilowatt = 1000 watts) and multiplying this by the number of hours the appliance is used, we calculate the kilowatt-hours consumed. Utility companies charge us based on these kWh readings.

However, it鈥檚 important to remember that our activities can fluctuate, leading to variations in power consumption throughout the day. This is where concepts such as 'demand' come into play, outlining the utmost level of electricity required during specific times, which significantly impacts the overall electrical system.
Kilowatt-Hour Meter
The kilowatt-hour meter is a familiar sight in many homes; it's often a small, box-like device attached to the side of a building with a clear digital or analog display showing how much electricity has been consumed.

The older versions may have a spinning disc that rotates proportional to the amount of electrical current being used. As time advances and the home draws on electricity, the meter tallies the total kWh consumed. This reading is then used by the power company to calculate your electricity bill. The newer models are often digital and might include sophisticated features like time-of-use metering, allowing for more detailed tracking of energy consumption patterns.
Integrating Time Switch
An integrating time switch is a critical component in managing electricity demand. It works in concert with the kWh meter, providing additional information about when power consumption actually occurs.

This device essentially measures and records the electricity demand over set intervals of time. Traditional settings are at 15, 30, or 60-minute intervals, but this can vary. Utility companies use this data for analyzing consumption patterns over the day, which is particularly crucial for instituting peak load management strategies.
Peak Load Management
Peak load management is all about balancing the demand for electricity with the available supply, especially during times when the demand is highest鈥攁lso known as peak periods.

For utility providers, understanding peak demand is crucial for several reasons. It enables them to ensure there's enough generation capacity to meet demand, avoid outages, and reduce the necessity of building new power plants, which can be costly.

From a customer perspective, being aware of peak load might lead to adjusting usage habits or investing in energy-efficient appliances to reduce costs and help the grid manage demand more effectively.
Energy Saving Measures
Implementing energy saving measures can significantly reduce electrical power consumption and costs. These initiatives are particularly effective when they address the period of peak demand.

Examples of energy-saving practices include using LED bulbs, which use less power for the same amount of light, utilizing smart thermostats to adjust temperatures efficiently, and running high-energy appliances like washers and dryers during off-peak hours.

Importantly, understanding your demand patterns via a demand meter can pinpoint specific areas of high energy use, allowing for a strategic approach to cutting back on unnecessary power consumption and fostering sustainable energy use habits.

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Most popular questions from this chapter

a. Give an estimate of the energy consumed in one year by a modern city of 300000 inhabitants in North America (refer to Fig. 9). b. If the average rate is \(40 \mathrm{mill} / \mathrm{kW} \cdot \mathrm{h}\), calculate the annual cost of servicing the city.

Explain what is meant by the following terms: \(\begin{array}{ll}\text { demand } & \text { billing demand } \\ \text { maximum demand } & \text { fixed cost } \\ \text { mill } & \text { demand interval }\end{array}\)

a. Assuming that power in a large industry can be purchased at \(15 \mathrm{mill} / \mathrm{kW} \cdot \mathrm{h}\), estimate the hourly cost of running a \(4000 \mathrm{hp}\) motor having an efficiency of 96 percent. b. If the motor runs night and day, 365 days per year, what would the annual saving be if the motor were redesigned to have an efficiency of \(97 \%\).

We want to determine the power of an electric heater installed in a home by means of a watthourmeter. All other loads are shut off and it is found that the disc makes 10 complete turns in 1 minute. If \(\mathrm{K}_{\mathrm{h}}=3.0\), calculate the power of the heater.

The demand meter in a factory registers a maximum demand of \(4300 \mathrm{~kW}\) during the month of May. The power factor is known to be less than 70 percent. a. If capacitors had been installed so as to raise the power factor to \(0.9\), would the maximum demand have been affected? b. Would the billing demand have been affected?
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